feat(18): not really working docker images

wrapping + into span inline, to make it behave like part of
surrounding text in a div, somewhat ok

.scalafmt.conf

@@ -0,0 +1,2 @@
+version = "3.7.3"
+runner.dialect = scala3

11-single-price-grid-component/README.md

@@ -1,88 +0,0 @@
-# Frontend Mentor - Single price grid component
-
-![Design preview for the Single price grid component coding challenge](./design/desktop-preview.jpg)
-
-## Welcome! 👋
-
-Thanks for checking out this front-end coding challenge.
-
-[Frontend Mentor](https://www.frontendmentor.io) challenges help you improve your coding skills by building realistic projects.
-
-**To do this challenge, you need a basic understanding of HTML and CSS.**
-
-## The challenge
-
-Your users should be able to:
-
-- View the optimal layout for the component depending on their device's screen size
-- See a hover state on desktop for the Sign Up call-to-action
-
-Want some support on the challenge? [Join our Slack community](https://www.frontendmentor.io/slack) and ask questions in the **#help** channel.
-
-## Where to find everything
-
-Your task is to build out the project to the designs inside the `/design` folder. You will find both a mobile and a desktop version of the design. 
-
-The designs are in JPG static format. Using JPGs will mean that you'll need to use your best judgment for styles such as `font-size`, `padding` and `margin`. 
-
-If you would like the design files (we provide Sketch & Figma versions) to inspect the design in more detail, you can [subscribe as a PRO member](https://www.frontendmentor.io/pro).
-
-You will find all the required assets in the `/images` folder. The assets are already optimized.
-
-There is also a `style-guide.md` file containing the information you'll need, such as color palette and fonts.
-
-## Building your project
-
-Feel free to use any workflow that you feel comfortable with. Below is a suggested process, but do not feel like you need to follow these steps:
-
-1. Initialize your project as a public repository on [GitHub](https://github.com/). Creating a repo will make it easier to share your code with the community if you need help. If you're not sure how to do this, [have a read-through of this Try Git resource](https://try.github.io/).
-2. Configure your repository to publish your code to a web address. This will also be useful if you need some help during a challenge as you can share the URL for your project with your repo URL. There are a number of ways to do this, and we provide some recommendations below.
-3. Look through the designs to start planning out how you'll tackle the project. This step is crucial to help you think ahead for CSS classes to create reusable styles.
-4. Before adding any styles, structure your content with HTML. Writing your HTML first can help focus your attention on creating well-structured content.
-5. Write out the base styles for your project, including general content styles, such as `font-family` and `font-size`.
-6. Start adding styles to the top of the page and work down. Only move on to the next section once you're happy you've completed the area you're working on.
-
-## Deploying your project
-
-As mentioned above, there are many ways to host your project for free. Our recommend hosts are:
-
-- [GitHub Pages](https://pages.github.com/)
-- [Vercel](https://vercel.com/)
-- [Netlify](https://www.netlify.com/)
-
-You can host your site using one of these solutions or any of our other trusted providers. [Read more about our recommended and trusted hosts](https://medium.com/frontend-mentor/frontend-mentor-trusted-hosting-providers-bf000dfebe).
-
-## Create a custom `README.md`
-
-We strongly recommend overwriting this `README.md` with a custom one. We've provided a template inside the [`README-template.md`](./README-template.md) file in this starter code.
-
-The template provides a guide for what to add. A custom `README` will help you explain your project and reflect on your learnings. Please feel free to edit our template as much as you like.
-
-Once you've added your information to the template, delete this file and rename the `README-template.md` file to `README.md`. That will make it show up as your repository's README file.
-
-## Submitting your solution
-
-Submit your solution on the platform for the rest of the community to see. Follow our ["Complete guide to submitting solutions"](https://medium.com/frontend-mentor/a-complete-guide-to-submitting-solutions-on-frontend-mentor-ac6384162248) for tips on how to do this.
-
-Remember, if you're looking for feedback on your solution, be sure to ask questions when submitting it. The more specific and detailed you are with your questions, the higher the chance you'll get valuable feedback from the community.
-
-## Sharing your solution
-
-There are multiple places you can share your solution:
-
-1. Share your solution page in the **#finished-projects** channel of the [Slack community](https://www.frontendmentor.io/slack). 
-2. Tweet [@frontendmentor](https://twitter.com/frontendmentor) and mention **@frontendmentor**, including the repo and live URLs in the tweet. We'd love to take a look at what you've built and help share it around.
-3. Share your solution on other social channels like LinkedIn.
-4. Blog about your experience building your project. Writing about your workflow, technical choices, and talking through your code is a brilliant way to reinforce what you've learned. Great platforms to write on are [dev.to](https://dev.to/), [Hashnode](https://hashnode.com/), and [CodeNewbie](https://community.codenewbie.org/).
-
-We provide templates to help you share your solution once you've submitted it on the platform. Please do edit them and include specific questions when you're looking for feedback. 
-
-The more specific you are with your questions the more likely it is that another member of the community will give you feedback.
-
-## Got feedback for us?
-
-We love receiving feedback! We're always looking to improve our challenges and our platform. So if you have anything you'd like to mention, please email hi[at]frontendmentor[dot]io.
-
-This challenge is completely free. Please share it with anyone who will find it useful for practice.
-
-**Have fun building!** 🚀

11-single-price-grid-component/README.org

@@ -0,0 +1,121 @@
+* Frontend Mentor - Single price grid component solution
+:PROPERTIES:
+:CUSTOM_ID: frontend-mentor---single-price-grid-component-solution
+:END:
+This is a solution to the
+[[https://www.frontendmentor.io/challenges/single-price-grid-component-5ce41129d0ff452fec5abbbc][Single
+price grid component challenge on Frontend Mentor]]. Frontend Mentor
+challenges help you improve your coding skills by building realistic
+projects.
+
+** Overview
+:PROPERTIES:
+:CUSTOM_ID: overview
+:END:
+*** The challenge
+:PROPERTIES:
+:CUSTOM_ID: the-challenge
+:END:
+Users should be able to:
+
+- View the optimal layout for the component depending on their device's
+  screen size
+- See a hover state on desktop for the Sign Up call-to-action
+
+*** Screenshot
+:PROPERTIES:
+:CUSTOM_ID: screenshot
+:END:
+[[./screenshot-desktop.png]]
+[[./screenshot-mobile.png]]
+
+*** Links
+:PROPERTIES:
+:CUSTOM_ID: links
+:END:
+- [[https://www.frontendmentor.io/solutions/tailwind-scala-ssr-scalatags-and-cask-deployed-with-docker-image-UPzyFXyf_L][Solution URL]]
+- [[https://efim-frontentmentor-price-grid-component.onrender.com/][Live Site URL]]
+
+** My process
+:PROPERTIES:
+:CUSTOM_ID: my-process
+:END:
+*** Built with
+:PROPERTIES:
+:CUSTOM_ID: built-with
+:END:
+- Semantic HTML5 markup
+- TailwindCSS
+- Scalatags
+  html generation on backend
+- Cask
+  simple Scala web server, with annotations to mark routes and simple functions to process request
+- Mobile-first workflow
+- Nix
+  for building the application, nix module for easy install to servers with NixOS, and docker image for other deployment
+
+*** What I learned
+:PROPERTIES:
+:CUSTOM_ID: what-i-learned
+:END:
+**** Setting up Cask server to serve static resources
+Previously in Vite the /public directory was just automagically made available to the production build.
+Now, with @cask.staticFiles("/public") the route /public would serve files from "public" directory
+
+The path is relative, so directory from which the server is started is important.
+But the thing works.
+
+**** First time installing TailwindCSS with cli, without the frontend bundler integration
+https://tailwindcss.com/docs/installation
+
+#+begin_src bash
+$ tailwindcss -i ./src/input.css -o ./dist/output.css --watch
+#+end_src
+
+Idea for this exercise was to generate `out.css` of the final TailwindCSS stylesheet into /dist directory, which would be in .gitignore
+
+The problem I've encountered - the nix derivation doesn't like to have all of the files in the tmp build directory, so files are referenced and loaded by neat library function
+#+begin_src nix
+    src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+#+end_src
+
+Which only puts unignored files into store.
+So one time for the build step i'm using tailwind this way:
+#+begin_src nix
+buildPhase = ''
+    sbt assembly
+    tailwindcss -i ./src/input.css -o ./output.css
+'';
+#+end_src
+
+and then copy resulting file where the server expects it to be.
+
+**** Written a NixOS module with Systemd service and a Nginx reverse proxy
+on my NixOS server i just need to reference the flake by the repository url, import the module, and then
+
+#+begin_src nix
+imports = [ inputs.htmx-examples.nixosModules.x86_64-linux.price-grid-app ];
+services.priceGridService = {
+  enable = true;
+  host = "price-grid.frontendmentor.sunshine.industries";
+  port = 12345;
+};
+#+end_src
+
+setting up config values, and =enable = true;= makes the server instantiate the systemd service, which will cover restarts and logs, and nginx reverse proxy.
+
+**** Found out about =Workdir= setting of systemd servcie and =WorkingDir= of docker image
+*** Continued development
+:PROPERTIES:
+:CUSTOM_ID: continued-development
+:END:
+This was first app (exercise #11) in the experiment with learning SSR in Scala, i've already completed exercise #14, and in the following steps I'm learning Thymeleaf templating engine, and HTMX - the library for extending html to make pages that allow easier partial page updates.
+
+** Acknowledgments
+:PROPERTIES:
+:CUSTOM_ID: acknowledgments
+:END:
+My gratitude to render.com who are providing free tier for the service hosting from the docker image.
+Which was necessary for me to submit the solution into frontendmentor.
+And to DockerHub for hosting my docker images gratis as well.
+And to Nix for their documentation!

11-single-price-grid-component/build.sbt

@@ -4,7 +4,7 @@ fork := true
 ThisBuild / version := "0.0.1"
 ThisBuild / organization := "industries.sunshine"
 
-lazy val root = (project in file("."))
+lazy val singlePriceGridComponent = (project in file("."))
   .settings(
     name := "priceGrid",
 

11-single-price-grid-component/default.nix

@@ -1,10 +1,10 @@
 { pkgs, lib, sbt-derivation }:
 
 let
+  pname =  "price-grid-app";
   package = sbt-derivation.lib.mkSbtDerivation {
-    inherit pkgs;
+    inherit pkgs pname;
     # ...and the rest of the arguments
-    pname = "price-grid-app";
     version = "0.0.1";
     src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
     nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
@@ -84,7 +84,35 @@ let
         };
       };
     };
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [ "${pkgs.jdk}/bin/java" "-jar" "${package}/bin/priceGridApp.jar" "--host" "0.0.0.0" ];
+      ExposedPorts = {
+        "8080/tcp" = {};
+      };
+      WorkingDir = "${package}/bin";
+    };
+  };
+  # image = pkgs.dockerTools.buildImage {
+  #   name = pname;
+  #   tag = "latest";
+  #   created = "now";
+  #     copyToRoot = pkgs.buildEnv {
+  #     name = "image-root";
+  #     paths = [ package pkgs.dockerTools.binSh pkgs.coreutils ];
+  #     pathsToLink = [ "/bin" "/dist" "/public" ];
+  #   };
+  #   config = {
+  #     Cmd = [ "${pkgs.jdk}/bin/java" "-jar" "${package}/bin/priceGridApp.jar" "--host" "0.0.0.0" ];
+  #     ExposedPorts = {
+  #       "8080/tcp" = {};
+  #     };
+  #     WorkingDir = "${package}/bin";
+  #   };
+  # };
 in {
-  package = package;
-  module = module;
+  inherit package module image;
 }

11-single-price-grid-component/src/main/scala/pricegrid/Page.scala

@@ -128,8 +128,8 @@ object Page {
         target := "_blank",
         "Frontend Mentor. "
       ),
-      "Coded by ",
-      a(href := "#", "Your Name Here")
+      "Source code at",
+      a(href := "https://github.com/efim/Learning-HTMX", "Your Name Here")
     )
   )
 }

12-order-summary-component-thymeleaf/README.org

@@ -23,15 +23,16 @@ Users should be able to:
 :PROPERTIES:
 :CUSTOM_ID: screenshot
 :END:
-[[./screenshot.png]]
+[[screenshot-desktop.png]]
+[[screenshot-mobile.png]]
 
 *** Links
 :PROPERTIES:
 :CUSTOM_ID: links
 :END:
-- Solution URL: [[https://your-solution-url.com][Add solution URL here]]
-- Live Site URL: [[https://your-live-site-url.com][Add live site URL
-  here]]
+- [[https://www.frontendmentor.io/solutions/responsive-by-tailwindcss-ssr-on-scala-with-cask-thymeleaf-template-bMMgFdajHT][Solution URL]]
+- [[https://efim-frontentmentor-order-summary.onrender.com/][Live Site URL]]
+  Free instance on render.com is turned off after 15 minutes of inactivity, please give the server a moment to start up if you're visiting it at the moment of being turned off
 
 ** My process
 :PROPERTIES:
@@ -42,16 +43,11 @@ Users should be able to:
 :CUSTOM_ID: built-with
 :END:
 - Semantic HTML5 markup
-- CSS custom properties
-- Flexbox
-- CSS Grid
+- Tailwincss
 - Mobile-first workflow
-- [[https://reactjs.org/][React]] - JS library
-- [[https://nextjs.org/][Next.js]] - React framework
-- [[https://styled-components.com/][Styled Components]] - For styles
+- SSR in Scala & Cask webserver
+- Thymeleaf templates
 
-*Note: These are just examples. Delete this note and replace the list
-above with your own choices*
 **** running during development
 installing "sbt-revolver":
 #+begin_src scala
@@ -82,9 +78,10 @@ will look for file in "src/main/resources/templates/index.html" to treat as a te
 **** with these html templates I can start learning and using Emmet mode in Emacs
 https://github.com/smihica/emmet-mode
 
-**** importing Thymeleaf template
-
+**** Importing Thymeleaf template
 There are other methods to include templates like th:replace and th:include, which have slightly different behaviours. th:insert keeps the host tag (the div in your case), th:replace replaces the whole host tag with the fragment, and th:include replaces the inner content of the host tag with the fragment.
+
+So i can actually have the "Order Summary" as reusable part.
 **** getting responsive background image with Tailwincss
 #+begin_src html
     <div
@@ -96,28 +93,10 @@ There are other methods to include templates like th:replace and th:include, whi
 :PROPERTIES:
 :CUSTOM_ID: continued-development
 :END:
-Use this section to outline areas that you want to continue focusing on
-in future projects. These could be concepts you're still not completely
-comfortable with or techniques you found useful that you want to refine
-and perfect.
+This was first exercise I've done with Thymeleaf templates.
 
-*Note: Delete this note and the content within this section and replace
-with your own plans for continued development.*
-
-*** Useful resources
-:PROPERTIES:
-:CUSTOM_ID: useful-resources
-:END:
-- [[https://www.example.com][Example resource 1]] - This helped me for
-  XYZ reason. I really liked this pattern and will use it going forward.
-- [[https://www.example.com][Example resource 2]] - This is an amazing
-  article which helped me finally understand XYZ. I'd recommend it to
-  anyone still learning this concept.
-
-*Note: Delete this note and replace the list above with resources that
-helped you during the challenge. These could come in handy for anyone
-viewing your solution or for yourself when you look back on this project
-in the future.*
+Next is using fragments with some dynamic content and styling.
+Then attempting to include htmx fueled reactivity.
 
 ** Acknowledgments
 :PROPERTIES:

12-order-summary-component-thymeleaf/build.sbt

@@ -8,7 +8,7 @@ val toolkitV = "0.1.7"
 val toolkit = "org.scala-lang" %% "toolkit" % toolkitV
 val toolkitTest = "org.scala-lang" %% "toolkit-test" % toolkitV
 
-lazy val root = (project in file("."))
+lazy val orderSummaryComponent = (project in file("."))
   .settings(
     name := "order-summary-component",
     libraryDependencies += toolkit,

12-order-summary-component-thymeleaf/default.nix

@@ -1,10 +1,10 @@
 { pkgs, lib, sbt-derivation }:
 
 let
+  pname = "order-summary-component-app";
   package = sbt-derivation.lib.mkSbtDerivation {
-    inherit pkgs;
+    inherit pkgs pname;
     # ...and the rest of the arguments
-    pname = "order-summary-component-app";
     version = "0.0.1";
     src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
     nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
@@ -17,7 +17,7 @@ let
     # anyway copied to correct place
     installPhase = ''
       mkdir -p $out/bin
-      cp target/scala-*/order-summary-component-assembly-*.jar $out/bin/order-summary-component.jar
+      cp target/scala-*/order-summary-component-assembly-*.jar $out/bin/${pname}.jar
       mkdir -p $out/bin/dist
       cp ./output.css $out/bin/dist/output.css
       cp -r public $out/bin/public
@@ -26,6 +26,8 @@ let
     depsSha256 = "sha256-ADQB4qTl69ERlLAURrtR3fWa7PUdYjFLk5QdU5QgxRQ=";
   };
 
+in {
+  inherit package;
   module = { config, pkgs, ... }:
     let cfg = config.services.orderSummaryComponent;
     in {
@@ -67,7 +69,7 @@ let
             startLimitBurst = 10;
             serviceConfig = {
               ExecStart =
-                "${pkgs.jdk}/bin/java -jar ${package}/bin/order-summary-component.jar -p ${
+                "${pkgs.jdk}/bin/java -jar ${package}/bin/${pname}.jar -p ${
                   toString cfg.port
                 } --host ${serverHost}";
               WorkingDirectory = "${package}/bin";
@@ -84,7 +86,16 @@ let
         };
       };
     };
-in {
-  package = package;
-  module = module;
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [ "${pkgs.jdk}/bin/java" "-jar" "${package}/bin/${pname}.jar" "--host" "0.0.0.0" ];
+      ExposedPorts = {
+        "8080/tcp" = {};
+      };
+      WorkingDir = "${package}/bin";
+    };
+  };
 }

12-order-summary-component-thymeleaf/src/main/resources/templates/index.html

@@ -43,7 +43,7 @@
       Challenge by
       <a href="https://www.frontendmentor.io?ref=challenge" target="_blank"
         >Frontend Mentor</a
-      >. Coded by <a href="#">Your Name Here</a>.
+      >. Source code at <a href="https://github.com/efim/Learning-HTMX">Your Name Here</a>.
     </div>
   </body>
 </html>

13-testimonials-grid-section/README-template.md

@@ -1,110 +0,0 @@
-# Frontend Mentor - Testimonials grid section solution
-
-This is a solution to the [Testimonials grid section challenge on Frontend Mentor](https://www.frontendmentor.io/challenges/testimonials-grid-section-Nnw6J7Un7). Frontend Mentor challenges help you improve your coding skills by building realistic projects. 
-
-## Table of contents
-
-- [Overview](#overview)
-  - [The challenge](#the-challenge)
-  - [Screenshot](#screenshot)
-  - [Links](#links)
-- [My process](#my-process)
-  - [Built with](#built-with)
-  - [What I learned](#what-i-learned)
-  - [Continued development](#continued-development)
-  - [Useful resources](#useful-resources)
-- [Author](#author)
-- [Acknowledgments](#acknowledgments)
-
-**Note: Delete this note and update the table of contents based on what sections you keep.**
-
-## Overview
-
-### The challenge
-
-Users should be able to:
-
-- View the optimal layout for the site depending on their device's screen size
-
-### Screenshot
-
-![](./screenshot.jpg)
-
-Add a screenshot of your solution. The easiest way to do this is to use Firefox to view your project, right-click the page and select "Take a Screenshot". You can choose either a full-height screenshot or a cropped one based on how long the page is. If it's very long, it might be best to crop it.
-
-Alternatively, you can use a tool like [FireShot](https://getfireshot.com/) to take the screenshot. FireShot has a free option, so you don't need to purchase it. 
-
-Then crop/optimize/edit your image however you like, add it to your project, and update the file path in the image above.
-
-**Note: Delete this note and the paragraphs above when you add your screenshot. If you prefer not to add a screenshot, feel free to remove this entire section.**
-
-### Links
-
-- Solution URL: [Add solution URL here](https://your-solution-url.com)
-- Live Site URL: [Add live site URL here](https://your-live-site-url.com)
-
-## My process
-
-### Built with
-
-- Semantic HTML5 markup
-- CSS custom properties
-- Flexbox
-- CSS Grid
-- Mobile-first workflow
-- [React](https://reactjs.org/) - JS library
-- [Next.js](https://nextjs.org/) - React framework
-- [Styled Components](https://styled-components.com/) - For styles
-
-**Note: These are just examples. Delete this note and replace the list above with your own choices**
-
-### What I learned
-
-Use this section to recap over some of your major learnings while working through this project. Writing these out and providing code samples of areas you want to highlight is a great way to reinforce your own knowledge.
-
-To see how you can add code snippets, see below:
-
-```html
-<h1>Some HTML code I'm proud of</h1>
-```
-```css
-.proud-of-this-css {
-  color: papayawhip;
-}
-```
-```js
-const proudOfThisFunc = () => {
-  console.log('🎉')
-}
-```
-
-If you want more help with writing markdown, we'd recommend checking out [The Markdown Guide](https://www.markdownguide.org/) to learn more.
-
-**Note: Delete this note and the content within this section and replace with your own learnings.**
-
-### Continued development
-
-Use this section to outline areas that you want to continue focusing on in future projects. These could be concepts you're still not completely comfortable with or techniques you found useful that you want to refine and perfect.
-
-**Note: Delete this note and the content within this section and replace with your own plans for continued development.**
-
-### Useful resources
-
-- [Example resource 1](https://www.example.com) - This helped me for XYZ reason. I really liked this pattern and will use it going forward.
-- [Example resource 2](https://www.example.com) - This is an amazing article which helped me finally understand XYZ. I'd recommend it to anyone still learning this concept.
-
-**Note: Delete this note and replace the list above with resources that helped you during the challenge. These could come in handy for anyone viewing your solution or for yourself when you look back on this project in the future.**
-
-## Author
-
-- Website - [Add your name here](https://www.your-site.com)
-- Frontend Mentor - [@yourusername](https://www.frontendmentor.io/profile/yourusername)
-- Twitter - [@yourusername](https://www.twitter.com/yourusername)
-
-**Note: Delete this note and add/remove/edit lines above based on what links you'd like to share.**
-
-## Acknowledgments
-
-This is where you can give a hat tip to anyone who helped you out on this project. Perhaps you worked in a team or got some inspiration from someone else's solution. This is the perfect place to give them some credit.
-
-**Note: Delete this note and edit this section's content as necessary. If you completed this challenge by yourself, feel free to delete this section entirely.**

13-testimonials-grid-section/README.org

@@ -0,0 +1,101 @@
+* Frontend Mentor - Testimonials grid section solution
+:PROPERTIES:
+:CUSTOM_ID: frontend-mentor---testimonials-grid-section-solution
+:END:
+This is a solution to the
+[[https://www.frontendmentor.io/challenges/testimonials-grid-section-Nnw6J7Un7][Testimonials
+grid section challenge on Frontend Mentor]]. Frontend Mentor challenges
+help you improve your coding skills by building realistic projects.
+
+** Overview
+:PROPERTIES:
+:CUSTOM_ID: overview
+:END:
+*** The challenge
+:PROPERTIES:
+:CUSTOM_ID: the-challenge
+:END:
+Users should be able to:
+
+- View the optimal layout for the site depending on their device's
+  screen size
+
+*** Screenshot
+:PROPERTIES:
+:CUSTOM_ID: screenshot
+:END:
+[[screenshot-desktop.png]]
+[[screenshot-mobile.png]]
+
+
+*** Links
+:PROPERTIES:
+:CUSTOM_ID: links
+:END:
+- [[https://efim-frontentmentor-testimoinals-grid.onrender.com/][Solution URL]]
+- Live Site URL
+
+** My process
+:PROPERTIES:
+:CUSTOM_ID: my-process
+:END:
+*** Built with
+:PROPERTIES:
+:CUSTOM_ID: built-with
+:END:
+- Semantic HTML5 markup
+- TailwindCSS
+- CSS Grid
+- SSR on Scala with Cask
+- Thymeleaf templates
+
+*** What I learned
+:PROPERTIES:
+:CUSTOM_ID: what-i-learned
+:END:
+**** defining template fragments in Thymeleaf that take parameters
+Bigger thing i didn't understand is that element marked by "th:fragment" are also rendered.
+
+I had a problem with 'th:each' being defined on the same element as 'th:fragment'
+
+even though due to th:each single 'testimonial' object is available for inserting. if i try to use that singular 'testimonial' as fragment argument, the also existing 'th:each' over "testimonials" runs and sinse there's no passed list of objects - nothing gets rendered.
+
+So 'th:each' should be around the single fragment in the future.
+Currently i've hacked this by passing List(testimonial) for re-rendering a single item.
+
+**** A way to style fragments from the code
+I've initially implemented the static page, with manually settin different testimonial colors and sizes, but then implemented a template fragment, which uses "th:classappend" to add tailwind color and size classes from the context objects.
+
+This way unfortunately the tag marked with "th:fragement" (and it is getting rendered when template file is opened as a static file) doesn't have stylings.
+
+And I'd really like a way that allows for having a fully displayed static template, which doesn't interfere with rendering.
+
+Also - had to remember to not have space in
+  content: ["./src/**/*.{html,scala}"],
+so that TailwindCSS would also monitor classes in the code
+
+**** first attempt to use partial gragments as replies to htmx requests
+I've added logic for transposing the 2x1 card into 1x2 and vice-versa (as an exercise in using htmx).
+
+Backing in "next orientation" into argument for the hx-get request, which is executed on click, and receives new html markup to get inserted, with the testimonial orientation classes changed.
+
+*** Continued development
+:PROPERTIES:
+:CUSTOM_ID: continued-development
+:END:
+a better way to style the components, so that static file would also have the styling on the 'fragment' element
+
+already found a way to render fragments without needing to put them into a separate file.
+
+*** Useful resources
+:PROPERTIES:
+:CUSTOM_ID: useful-resources
+:END:
+- The htmx [[https://htmx.org/docs/][documentation]] and [[https://htmx.org/examples/][examples]]
+- [[https://htmx.org/essays/][The articles on htmx approach to web dev]]
+
+** Acknowledgments
+:PROPERTIES:
+:CUSTOM_ID: acknowledgments
+:END:
+Here I'll like to express gratitute to htmx, for writing examples and articles which helped me to go from totally not understanding their position, to actively wanting to learn this.

13-testimonials-grid-section/build.sbt

@@ -4,7 +4,7 @@ fork := true
 ThisBuild / version := "0.0.1"
 ThisBuild / organization := "industries.sunshine"
 
-lazy val root = (project in file("."))
+lazy val testimonialsGrid = (project in file("."))
   .settings(
     name := "testimonials-grid-section",
     libraryDependencies ++= Seq(

13-testimonials-grid-section/default.nix

@@ -26,6 +26,8 @@ let
     depsSha256 = "sha256-Y5RktcE3fxUJci4o7LTuNlBEybTdVRqsG551AkVeRPw=";
   };
 
+in {
+  inherit package;
   module = { config, pkgs, ... }:
     let cfg = config.services.${pname};
     in {
@@ -84,7 +86,20 @@ let
         };
       };
     };
-in {
-  package = package;
-  module = module;
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [
+        "${pkgs.jdk}/bin/java"
+        "-jar"
+        "${package}/bin/${pname}.jar"
+        "--host"
+        "0.0.0.0"
+      ];
+      ExposedPorts = { "8080/tcp" = { }; };
+      WorkingDir = "${package}/bin";
+    };
+  };
 }

13-testimonials-grid-section/src/main/resources/templates/index.html

@@ -189,7 +189,7 @@
       Challenge by
       <a href="https://www.frontendmentor.io?ref=challenge" target="_blank"
         >Frontend Mentor</a
-      >. Coded by <a href="#">Your Name Here</a>.
+      >. Source code at <a href="https://github.com/efim/Learning-HTMX">Your Name Here</a>.
     </div>
   </body>
 </html>

14-rock-paper-scissors/README-template.md

@@ -1,113 +0,0 @@
-# Frontend Mentor - Rock, Paper, Scissors solution
-
-This is a solution to the [Rock, Paper, Scissors challenge on Frontend Mentor](https://www.frontendmentor.io/challenges/rock-paper-scissors-game-pTgwgvgH). Frontend Mentor challenges help you improve your coding skills by building realistic projects. 
-
-## Table of contents
-
-- [Overview](#overview)
-  - [The challenge](#the-challenge)
-  - [Screenshot](#screenshot)
-  - [Links](#links)
-- [My process](#my-process)
-  - [Built with](#built-with)
-  - [What I learned](#what-i-learned)
-  - [Continued development](#continued-development)
-  - [Useful resources](#useful-resources)
-- [Author](#author)
-- [Acknowledgments](#acknowledgments)
-
-**Note: Delete this note and update the table of contents based on what sections you keep.**
-
-## Overview
-
-### The challenge
-
-Users should be able to:
-
-- View the optimal layout for the game depending on their device's screen size
-- Play Rock, Paper, Scissors against the computer
-- Maintain the state of the score after refreshing the browser _(optional)_
-- **Bonus**: Play Rock, Paper, Scissors, Lizard, Spock against the computer _(optional)_
-
-### Screenshot
-
-![](./screenshot.jpg)
-
-Add a screenshot of your solution. The easiest way to do this is to use Firefox to view your project, right-click the page and select "Take a Screenshot". You can choose either a full-height screenshot or a cropped one based on how long the page is. If it's very long, it might be best to crop it.
-
-Alternatively, you can use a tool like [FireShot](https://getfireshot.com/) to take the screenshot. FireShot has a free option, so you don't need to purchase it. 
-
-Then crop/optimize/edit your image however you like, add it to your project, and update the file path in the image above.
-
-**Note: Delete this note and the paragraphs above when you add your screenshot. If you prefer not to add a screenshot, feel free to remove this entire section.**
-
-### Links
-
-- Solution URL: [Add solution URL here](https://your-solution-url.com)
-- Live Site URL: [Add live site URL here](https://your-live-site-url.com)
-
-## My process
-
-### Built with
-
-- Semantic HTML5 markup
-- CSS custom properties
-- Flexbox
-- CSS Grid
-- Mobile-first workflow
-- [React](https://reactjs.org/) - JS library
-- [Next.js](https://nextjs.org/) - React framework
-- [Styled Components](https://styled-components.com/) - For styles
-
-**Note: These are just examples. Delete this note and replace the list above with your own choices**
-
-### What I learned
-
-Use this section to recap over some of your major learnings while working through this project. Writing these out and providing code samples of areas you want to highlight is a great way to reinforce your own knowledge.
-
-To see how you can add code snippets, see below:
-
-```html
-<h1>Some HTML code I'm proud of</h1>
-```
-```css
-.proud-of-this-css {
-  color: papayawhip;
-}
-```
-```js
-const proudOfThisFunc = () => {
-  console.log('🎉')
-}
-```
-
-If you want more help with writing markdown, we'd recommend checking out [The Markdown Guide](https://www.markdownguide.org/) to learn more.
-
-**Note: Delete this note and the content within this section and replace with your own learnings.**
-
-### Continued development
-
-Use this section to outline areas that you want to continue focusing on in future projects. These could be concepts you're still not completely comfortable with or techniques you found useful that you want to refine and perfect.
-
-**Note: Delete this note and the content within this section and replace with your own plans for continued development.**
-
-### Useful resources
-
-- [Example resource 1](https://www.example.com) - This helped me for XYZ reason. I really liked this pattern and will use it going forward.
-- [Example resource 2](https://www.example.com) - This is an amazing article which helped me finally understand XYZ. I'd recommend it to anyone still learning this concept.
-
-**Note: Delete this note and replace the list above with resources that helped you during the challenge. These could come in handy for anyone viewing your solution or for yourself when you look back on this project in the future.**
-
-## Author
-
-- Website - [Add your name here](https://www.your-site.com)
-- Frontend Mentor - [@yourusername](https://www.frontendmentor.io/profile/yourusername)
-- Twitter - [@yourusername](https://www.twitter.com/yourusername)
-
-**Note: Delete this note and add/remove/edit lines above based on what links you'd like to share.**
-
-## Acknowledgments
-
-This is where you can give a hat tip to anyone who helped you out on this project. Perhaps you worked in a team or got some inspiration from someone else's solution. This is the perfect place to give them some credit.
-
-**Note: Delete this note and edit this section's content as necessary. If you completed this challenge by yourself, feel free to delete this section entirely.**

14-rock-paper-scissors/README.md

@@ -1,119 +0,0 @@
-# Frontend Mentor - Rock, Paper, Scissors
-
-![Design preview for the Rock, Paper, Scissors coding challenge](./design/desktop-preview.jpg)
-
-## Welcome! 👋
-
-Thanks for checking out this front-end coding challenge.
-
-[Frontend Mentor](https://www.frontendmentor.io) challenges help you improve your coding skills by building realistic projects.
-
-**To do this challenge, you need a basic understanding of HTML, CSS and JavaScript.**
-
-## The challenge
-
-Your challenge is to build out this Rock, Paper, Scissors game and get it looking as close to the design as possible.
-
-You can use any tools you like to help you complete the challenge. So if you've got something you'd like to practice, feel free to give it a go.
-
-Your users should be able to:
-
-- View the optimal layout for the game depending on their device's screen size
-- Play Rock, Paper, Scissors against the computer
-- Maintain the state of the score after refreshing the browser _(optional)_
-- **Bonus**: Play Rock, Paper, Scissors, Lizard, Spock against the computer _(optional)_
-
-### Rules
-
-If the player wins, they gain 1 point. If the computer wins, the player loses one point.
-
-#### Original
-
-- Paper beats Rock
-- Rock beats Scissors
-- Scissors beats Paper
-
-#### Bonus
-
-- Scissors beats Paper
-- Paper beats Rock
-- Rock beats Lizard
-- Lizard beats Spock
-- Spock beats Scissors
-- Scissors beats Lizard
-- Paper beats Spock
-- Rock beats Scissors
-- Lizard beats Paper
-- Spock beats Rock
-
-Not sure what Rock, Paper, Scissors, Lizard, Spock is? [Check out this clip from The Big Bang Theory](https://www.youtube.com/watch?v=iSHPVCBsnLw).
-
-Want some support on the challenge? [Join our Slack community](https://www.frontendmentor.io/slack) and ask questions in the **#help** channel.
-
-## Where to find everything
-
-Your task is to build out the project to the designs inside the `/design` folder. You can either choose the `original` designs for the simpler version or the `bonus` designs for the harder version. You will find both mobile and desktop versions of the design to work to. Each file is also named depending on which step in the game the design is for.
-
-The designs are in JPG static format. Using JPGs will mean that you'll need to use your best judgment for styles such as `font-size`, `padding` and `margin`. 
-
-If you would like the design files (we provide Sketch & Figma versions) to inspect the design in more detail, you can [subscribe as a PRO member](https://www.frontendmentor.io/pro).
-
-You will find all the required assets in the `/images` folder. The assets are already optimized.
-
-There is also a `style-guide.md` file containing the information you'll need, such as color palette and fonts.
-
-## Building your project
-
-Feel free to use any workflow that you feel comfortable with. Below is a suggested process, but do not feel like you need to follow these steps:
-
-1. Initialize your project as a public repository on [GitHub](https://github.com/). Creating a repo will make it easier to share your code with the community if you need help. If you're not sure how to do this, [have a read-through of this Try Git resource](https://try.github.io/).
-2. Configure your repository to publish your code to a web address. This will also be useful if you need some help during a challenge as you can share the URL for your project with your repo URL. There are a number of ways to do this, and we provide some recommendations below.
-3. Look through the designs to start planning out how you'll tackle the project. This step is crucial to help you think ahead for CSS classes to create reusable styles.
-4. Before adding any styles, structure your content with HTML. Writing your HTML first can help focus your attention on creating well-structured content.
-5. Write out the base styles for your project, including general content styles, such as `font-family` and `font-size`.
-6. Start adding styles to the top of the page and work down. Only move on to the next section once you're happy you've completed the area you're working on.
-
-## Deploying your project
-
-As mentioned above, there are many ways to host your project for free. Our recommend hosts are:
-
-- [GitHub Pages](https://pages.github.com/)
-- [Vercel](https://vercel.com/)
-- [Netlify](https://www.netlify.com/)
-
-You can host your site using one of these solutions or any of our other trusted providers. [Read more about our recommended and trusted hosts](https://medium.com/frontend-mentor/frontend-mentor-trusted-hosting-providers-bf000dfebe).
-
-## Create a custom `README.md`
-
-We strongly recommend overwriting this `README.md` with a custom one. We've provided a template inside the [`README-template.md`](./README-template.md) file in this starter code.
-
-The template provides a guide for what to add. A custom `README` will help you explain your project and reflect on your learnings. Please feel free to edit our template as much as you like.
-
-Once you've added your information to the template, delete this file and rename the `README-template.md` file to `README.md`. That will make it show up as your repository's README file.
-
-## Submitting your solution
-
-Submit your solution on the platform for the rest of the community to see. Follow our ["Complete guide to submitting solutions"](https://medium.com/frontend-mentor/a-complete-guide-to-submitting-solutions-on-frontend-mentor-ac6384162248) for tips on how to do this.
-
-Remember, if you're looking for feedback on your solution, be sure to ask questions when submitting it. The more specific and detailed you are with your questions, the higher the chance you'll get valuable feedback from the community.
-
-## Sharing your solution
-
-There are multiple places you can share your solution:
-
-1. Share your solution page in the **#finished-projects** channel of the [Slack community](https://www.frontendmentor.io/slack). 
-2. Tweet [@frontendmentor](https://twitter.com/frontendmentor) and mention **@frontendmentor**, including the repo and live URLs in the tweet. We'd love to take a look at what you've built and help share it around.
-3. Share your solution on other social channels like LinkedIn.
-4. Blog about your experience building your project. Writing about your workflow, technical choices, and talking through your code is a brilliant way to reinforce what you've learned. Great platforms to write on are [dev.to](https://dev.to/), [Hashnode](https://hashnode.com/), and [CodeNewbie](https://community.codenewbie.org/).
-
-We provide templates to help you share your solution once you've submitted it on the platform. Please do edit them and include specific questions when you're looking for feedback. 
-
-The more specific you are with your questions the more likely it is that another member of the community will give you feedback.
-
-## Got feedback for us?
-
-We love receiving feedback! We're always looking to improve our challenges and our platform. So if you have anything you'd like to mention, please email hi[at]frontendmentor[dot]io.
-
-This challenge is completely free. Please share it with anyone who will find it useful for practice.
-
-**Have fun building!** 🚀

14-rock-paper-scissors/README.org

@@ -0,0 +1,166 @@
+* Frontend Mentor - Rock, Paper, Scissors solution
+:PROPERTIES:
+:CUSTOM_ID: frontend-mentor---rock-paper-scissors-solution
+:END:
+This is a solution to the
+[[https://www.frontendmentor.io/challenges/rock-paper-scissors-game-pTgwgvgH][Rock,
+Paper, Scissors challenge on Frontend Mentor]]. Frontend Mentor
+challenges help you improve your coding skills by building realistic
+projects.
+
+** Overview
+:PROPERTIES:
+:CUSTOM_ID: overview
+:END:
+*** The challenge
+:PROPERTIES:
+:CUSTOM_ID: the-challenge
+:END:
+Users should be able to:
+
+- View the optimal layout for the game depending on their device's
+  screen size
+- Play Rock, Paper, Scissors against the computer
+- Maintain the state of the score after refreshing the browser
+  /(optional)/
+- *Bonus*: Play Rock, Paper, Scissors, Lizard, Spock against the
+  computer /(optional)/
+
+*** Screenshot
+:PROPERTIES:
+:CUSTOM_ID: screenshot
+:END:
+[[screenshot-desktop.png]]
+[[screenshot-mobile.png]]
+
+*** Links
+:PROPERTIES:
+:CUSTOM_ID: links
+:END:
+- Solution URL
+- [[https://efim-frontendmentor-rock-paper-scissors.onrender.com/][Live Site URL]]
+
+** My process
+:PROPERTIES:
+:CUSTOM_ID: my-process
+:END:
+*** Built with
+:PROPERTIES:
+:CUSTOM_ID: built-with
+:END:
+- Semantic HTML5 markup
+- TailwindCSS, css animations
+- Flexbox & CSS Grid
+- Mobile-first workflow
+- SSR on Scala with Cask
+- Thymeleaf templates
+- htmx for partial page updates and interactivity
+
+*** What I learned
+:PROPERTIES:
+:CUSTOM_ID: what-i-learned
+:END:
+**** for template fragement styling - using CSS vars in <style> tag
+Allows for "initial" fragment specification to have static styling for viewing the page directly.
+
+This is useful for fragments that should have different stylings, like hand selection badges - should have different colors, so colors are specified in the code and passed as css var values via "th:style".
+
+Ordinary "style" attribute allows the tag which is marked by "th:fragment" to be viewed with some default styles. This is needed because for the "static" view of the page, browser ignores "th:fragment" attribute and just renders what it knows, as well as 'paper' and 'rock' badges, which are marked by "th:remove='all'" tag, which means they are only present in the "mockup static view"
+
+But! Syling sizes this way seems to be an error, i don't want to specify 8rem in my code for the fragments, and that also makes styling of responsive design complicated. I guess I'll want the fragment itself occupy "all parent" and control the size of parent from html where the fragment is inserted.
+**** different htmx controls:
+***** the hx-get on the click
+substitutes the hand selection part of the page to the initial "showdown" - with selected hand and animated wait on the "house choice".
+***** on load + delay:3s hx-get
+on "wait for house choice" fragemnt
+means the "get house choice" rest method executed automatically, and generates random choice.
+
+I'm substituting both hands \ whole 'showdown table' so i'm passing also a players choice into '/house-choice' rest endpoint.
+
+I could only substitue the house choice badge and the message, that would have been a simpler design.
+***** i wanted for message to show up with delay
+so initially i though I'll do another timed on load request to fetch message, but figured that i could use css animation to fade the message in.
+***** handling state of the fragment
+Creating a scala object "ShowdownState" allows for setting single variable into context, and then at least "having all attributes of state" is enforced by scala compiler.
+
+In documentaion i found that there's a shorthand for referencing attributes of single object:
+https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#expressions-on-selections-asterisk-syntax
+
+So i could set "th:object="${showdownState}"
+and then reference directly it's attributes by "*{playersChoice}"
+
+This can mitigate untyped nature of template variables.
+***** I got more experience with laying out template fragments.
+Putting 'showdown table' into separate file definitely helped, styling in the opened static file is nice.
+
+I'm not sure how much separate files are necessary. Maybe state of "player hand is present, house hand is not present" separate of "showdown and both hands are present" would be easier for styling. Because fragments could be shown at the page.
+
+Negative side of that - all other "not for render" parts of the page would have to be styled and kept in sync with the parts of pages for styling.
+Maybe I'll do put some bigger fragments into separate files, but not recrete the outer page for them, just keep them in center of blank page.
+
+***** Triggering client events from HTMX
+https://htmx.org/headers/hx-trigger/
+
+Adding header to REST response will trigger js event in the page.
+#+begin_src scala
+          cask.Response(
+            result,
+            headers = Seq(
+              "Content-Type" -> "text/html;charset=UTF-8",
+              "HX-Trigger-After-Settle" -> s"""{"updateScore": ${showdownState.scoreChange}}"""
+            )
+          )
+#+end_src
+
+This is a way to pass data from server into js code, executing on client.
+For exmaple +1 \ +0 \ -1 for the score change.
+
+***** Using small js scripts for browser functions
+
+I.e updating score, saving it into local storage and loading.
+
+Two simple scripts directly near the html markup which contains the score:
+#+begin_src html
+          <script type="text/javascript">
+            document.body.addEventListener("updateScore", function (evt) {
+              let scoreElement = document.querySelector("#the-score-number");
+              let newScore =
+                parseInt(scoreElement.textContent) + evt.detail.value;
+              console.log(
+                `the score will update by ${evt.detail.value} to ${newScore}`
+              );
+              localStorage.setItem("score", newScore);
+              scoreElement.textContent = newScore;
+            });
+          </script>
+          <script type="text/javascript">
+            document.addEventListener("DOMContentLoaded", (event) => {
+              let scoreElement = document.querySelector("#the-score-number");
+              let storedScore = localStorage.getItem("score");
+              if (storedScore !== null) {
+                scoreElement.textContent = storedScore;
+              } else {
+                scoreElement.textContent = 0;
+                localStorage.setItem("score", 0);
+              }
+            });
+          </script>
+#+end_src
+
+And debugging directly in the static preview.
+We can create event in the console and fire it from any element:
+
+#+begin_src js
+var myEvent2 = new CustomEvent('updateScore', {detail : {value: -1}});
+document.body.dispatchEvent(myEvent2)
+#+end_src
+
+*** Continued development
+:PROPERTIES:
+:CUSTOM_ID: continued-development
+:END:
+I could remake the html, to take into account the desktop layout. Which i didn't plan out and just didn't do - right now desktop only shows mobile layout increased in size.
+
+Overall in the future I'd want to practice more with features available in htmx, to know how to make websites with interactivity expected my modern users.
+And also - practice integration with js libraries - htmx examples show integration with sortable via events, and many others can be possible.
+

14-rock-paper-scissors/build.sbt

@@ -4,7 +4,7 @@ fork := true
 ThisBuild / version := "0.0.1"
 ThisBuild / organization := "industries.sunshine"
 
-lazy val root = (project in file("."))
+lazy val rockPaperScissors = (project in file("."))
   .settings(
     name := "rock-paper-scissors",
     libraryDependencies ++= Seq(

14-rock-paper-scissors/default.nix

@@ -0,0 +1,104 @@
+{ pkgs, lib, sbt-derivation }:
+
+let
+  pname = "rock-paper-scissors";
+  package = sbt-derivation.lib.mkSbtDerivation {
+    inherit pkgs pname;
+    # ...and the rest of the arguments
+    version = "0.0.1";
+    src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+    nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
+    buildPhase = ''
+      tailwindcss -i ./src/input.css -o ./src/main/resources/public/output.css
+      sbt assembly
+    '';
+    # css path different from ordinary development,
+    # because .gitignore makes it unavailable during nix build
+    # anyway copied to correct place
+    installPhase = ''
+      mkdir -p $out/bin
+      cp target/scala-*/${pname}-assembly-*.jar $out/bin/${pname}.jar
+    '';
+
+    depsSha256 = "sha256-Y5RktcE3fxUJci4o7LTuNlBEybTdVRqsG551AkVeRPw=";
+  };
+
+  module = { config, pkgs, ... }:
+    let cfg = config.services.${pname};
+    in {
+      options.services.${pname} = {
+        enable = lib.mkEnableOption "My frontendmentor exercise ${pname}";
+
+        port = lib.mkOption {
+          type = lib.types.int;
+          default = 8080;
+          description = "Port to listen on.";
+        };
+
+        host = lib.mkOption {
+          type = lib.types.str;
+          default = "localhost";
+          description = "Host to bind to.";
+        };
+
+        useNginx = lib.mkOption {
+          type = lib.types.bool;
+          default = true;
+          description = "Whether to use Nginx to proxy requests.";
+        };
+      };
+      config = lib.mkIf cfg.enable {
+        users.groups."${pname}-group" = { };
+        users.users."${pname}-user" = {
+          isSystemUser = true;
+          group = "${pname}-group";
+        };
+
+        systemd.services.${pname} =
+          let serverHost = if cfg.useNginx then "localhost" else cfg.host;
+          in {
+            description = "Exercise app ${pname}";
+            wantedBy = [ "multi-user.target" ];
+            after = [ "network.target" ];
+            startLimitIntervalSec = 30;
+            startLimitBurst = 10;
+            serviceConfig = {
+              ExecStart =
+                "${pkgs.jdk}/bin/java -jar ${package}/bin/${pname}.jar -p ${
+                  toString cfg.port
+                } --host ${serverHost}";
+              WorkingDirectory = "${package}/bin";
+              Restart = "on-failure";
+              User = "${pname}-user";
+              Group = "${pname}-group";
+            };
+          };
+
+        services.nginx = lib.mkIf cfg.useNginx {
+          virtualHosts.${cfg.host} = {
+            locations."/".proxyPass = "http://127.0.0.1:${toString cfg.port}";
+          };
+        };
+      };
+    };
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [ "${pkgs.jdk}/bin/java" "-jar" "${package}/bin/${pname}.jar" "--host" "0.0.0.0" ];
+      ExposedPorts = {
+        "8080/tcp" = {};
+      };
+    };
+  };
+  # image =     pkgs.dockerTools.buildLayeredImage { # so, wow, this works
+  #     name = "hello2";
+  #     tag = "latest";
+  #     config.Cmd = [ "${pkgs.hello}/bin/hello" ];
+  #   };
+in {
+  package = package;
+  module = module;
+  image = image;
+}

14-rock-paper-scissors/src/main/resources/templates/index.html

@@ -228,7 +228,7 @@
       Challenge by
       <a href="https://www.frontendmentor.io?ref=challenge" target="_blank"
         >Frontend Mentor</a
-      >. Coded by <a href="#">Your Name Here</a>.
+      >. Source code at <a href="https://github.com/efim/Learning-HTMX">Your Name Here</a>.
     </footer>
   </body>
 </html>

14-rock-paper-scissors/src/main/scala/rockpaperscissors/Main.scala

@@ -38,7 +38,7 @@ object Main {
     ParserForMethods(this).runOrExit(args)
   }
 
-  case class AppRoutes()(implicit cc: castor.Context, log: cask.Logger)
+  case class AppRoutes(pathPrefix: String = "")(implicit cc: castor.Context, log: cask.Logger)
       extends cask.Routes {
     val templateResolver = new ClassLoaderTemplateResolver()
     templateResolver.setPrefix("templates/");
@@ -48,7 +48,7 @@ object Main {
     val templateEngine = new TemplateEngine()
     templateEngine.setTemplateResolver(templateResolver)
 
-    @cask.get("/")
+    @cask.get(s"$pathPrefix/")
     def index(req: cask.Request) = {
       val context = new Context()
       val choices = Models.choiceSelectionItems.asJava
@@ -63,7 +63,7 @@ object Main {
       )
     }
 
-    @cask.get("/select/:choice")
+    @cask.get(s"$pathPrefix/select/:choice")
     def acceptPlayerVote(choice: String) = {
       val context = new Context()
       val badge = Models.choiceSelectionItems.find(_.c.name == choice)
@@ -88,7 +88,7 @@ object Main {
       response
     }
 
-    @cask.get("/house-choice/:playersChoice")
+    @cask.get(s"$pathPrefix/house-choice/:playersChoice")
     def requestHouseChoice(playersChoice: String) = {
       val context = new Context()
       val badge = Models.choiceSelectionItems.find(_.c.name == playersChoice)
@@ -121,7 +121,7 @@ object Main {
       response
     }
 
-    @cask.staticResources("/public")
+    @cask.staticResources(s"$pathPrefix/public")
     def publicFiles(req: cask.Request) = {
       "public"
     }

15-multi-step-form/.envrc

@@ -0,0 +1 @@
+use flake

15-multi-step-form/.gitignore

@@ -0,0 +1,16 @@
+.bsp/
+.scala-build/
+.metals/
+.direnv
+*/dist/
+/11-single-price-grid-component/.bloop/
+
+**/.bloop
+**/project/project/
+**/project/metals.sbt
+**/project/.bloop
+**/project/target/
+**/target/
+
+*/result
+result

15-multi-step-form/.scalafmt.conf

@@ -0,0 +1,2 @@
+version = "3.7.3"
+runner.dialect = scala3

15-multi-step-form/README.org

@@ -0,0 +1,161 @@
+* Frontend Mentor - Multi-step form solution
+:PROPERTIES:
+:CUSTOM_ID: frontend-mentor---multi-step-form-solution
+:END:
+This is a solution to the
+[[https://www.frontendmentor.io/challenges/multistep-form-YVAnSdqQBJ][Multi-step
+form challenge on Frontend Mentor]]. Frontend Mentor challenges help you
+improve your coding skills by building realistic projects.
+
+** Overview
+:PROPERTIES:
+:CUSTOM_ID: overview
+:END:
+*** The challenge
+:PROPERTIES:
+:CUSTOM_ID: the-challenge
+:END:
+Users should be able to:
+
+- Complete each step of the sequence
+- Go back to a previous step to update their selections
+- See a summary of their selections on the final step and confirm their
+  order
+- View the optimal layout for the interface depending on their device's
+  screen size
+- See hover and focus states for all interactive elements on the page
+- Receive form validation messages if:
+  - A field has been missed
+  - The email address is not formatted correctly
+  - A step is submitted, but no selection has been made
+
+*** Screenshot
+:PROPERTIES:
+:CUSTOM_ID: screenshot
+:END:
+[[screenshot-desktop.png]]
+[[screenshot-mobile.png]]
+
+*** Links
+:PROPERTIES:
+:CUSTOM_ID: links
+:END:
+- [[https://www.frontendmentor.io/solutions/responsive-ssr-on-scala-interactivity-by-htmx-thymeleaf-templates-QIGkOSgRa4][Solution URL]]
+- [[https://efim-frontentmentor-multi-step-form.onrender.com][Live Site URL]]
+
+** My process
+:PROPERTIES:
+:CUSTOM_ID: my-process
+:END:
+*** Built with
+:PROPERTIES:
+:CUSTOM_ID: built-with
+:END:
+- Semantic HTML5 markup
+  well, i tried, but yeah
+- TailwinCSS
+- Mobile-first workflow
+- Server-side rendering, in Scala and Cask
+- htmx
+- Thymeleaf html templates
+
+
+*** What I learned
+:PROPERTIES:
+:CUSTOM_ID: what-i-learned
+:END:
+**** hx-get and hx-post
+***** How i show correct form stage for each user on same URL
+on 'index.html' i use "initial loading" element
+#+begin_src html
+      <section hx-get="/get-form" hx-trigger="load" hx-swap="outerHTML">
+        <!-- here be immediate hx-get for the form. to subscitute the body -->
+        <img class="w-14 text-green-500 fill-current" src="../public/images/tail-spin.svg" alt="loading..." />
+      </section>
+#+end_src
+
+This element will do single GET request to server to /get-form
+And user already has cookie with sessionId set from visiting the root enpoint, which returned 'index.html'
+
+So request to /get-form already includes 'sessionId' cookie, and server can find \ initialize Answers data for this particular session,
+and 'currentStep' is part of the Answers
+
+so reloading 'index.html' would trigger /get-form, which would render correct step.
+***** hx-post
+This will make POST request.
+If we do GET request from <input> only current input value is included, as query para.
+POST request from <input> or from <form> would include all filelds of the form.
+
+So form submittion on "Next" and "Back" done via htmx POST requests, which parse and save passed attributes, but also server selects required next form step, renders it and returns for the 'hx-swap="outerHTML"'
+
+hx-post on <input> allows for 'inline validation' (see useful resources)
+this allows for validating field value - in isolation or together with all other form field values.
+
+**** Learned format in which browser sends POST attributes to the server
+Request payload as text:
+name=e&email=emails%40la.la&phone=%2B7%20(911)%2084-35644%20ext%20155
+
+I chose this exercise also because i wanted more experience in working with forms.
+Single form would still be much nicer, even with htmx, but yeah.
+Current exercise felt like full-fledged application.
+
+**** Styling of the checkbox and radiobuttons as big selectable areas
+This was first time I attempted something like this.
+Insight was to use <label> as overall container for the input and other data - descriptions and icons.
+
+Because user clicking on label automatically translates into toggling of the input, no js needed.
+
+Either hide (for radio button part on step 2) or keep (for checkboxes on step 3) the input, and put descriptions and icons as next element.
+
+So that =peer-= styling can be used.
+
+**** htmx inline validation of the phone number field
+Almost exactly as in example.
+Separate rest endpoint for the input field, which returns new rendered state.
+
+hx-post is triggered on input field default trigger = "changed",
+and i guess only on focus leaving field. So this seems quite efficient.
+
+This way validation can be done with very heavy libraries and access to DB and such. Over single field, or over all of them at once.
+Seems unusual, but cool
+*** Continued development
+:PROPERTIES:
+:CUSTOM_ID: continued-development
+:END:
+I want to learn more about Thymeleaf - how to use files for efficient fragment
+storage. Currently it feels that i have separate files, and it's nice, but some
+files have several fragments, and maybe need more documentation or markings.
+
+Look for other templating solutions for java \ scala, maybe there are others
+with 'fragment' functionality
+
+Would be nice to refactor the code, to have smaller and more directed files.
+
+I am also getting better at doing flex \ grid layouts without specific
+paddings\margins on the lements, but feel that i'm still abusing that, and that
+future tinkering with layouts could be painful due to free space being
+constructed from manual paddings\margings
+
+For htmx - would be nice to learn transition animations, and try to use it in a bigger exercise already.
+
+*** Useful resources
+:PROPERTIES:
+:CUSTOM_ID: useful-resources
+:END:
+- htmx inline validation
+  https://htmx.org/examples/inline-validation/
+- htmx control of parameters sent with response
+  https://htmx.org/docs/#parameters
+** Acknowledgments
+:PROPERTIES:
+:CUSTOM_ID: acknowledgments
+:END:
+- svg animated spinner - from SamHerbert
+  https://github.com/SamHerbert/SVG-Loaders/tree/master
+  http://samherbert.net/svg-loaders/
+- tailwind elements - for their example of 'switch styled' checkbox
+  which I used as inspiration for my styling
+  https://tailwind-elements.com/docs/standard/forms/switch/
+- to render.com for allowing DockerImage deployments on a free tier
+  they get shut down after 15 minutes of inactivity, and image has to be < 10Gb
+  but this is great! no credit card needed

15-multi-step-form/build.sbt

@@ -0,0 +1,17 @@
+ThisBuild / scalaVersion := "3.2.2"
+
+fork := true
+
+ThisBuild / version := "0.0.1"
+ThisBuild / organization := "industries.sunshine"
+
+lazy val multiStepForm = (project in file("."))
+  .settings(
+    name := "multi-step-form",
+    libraryDependencies ++= Seq(
+      "com.lihaoyi" %% "cask" % "0.9.1",
+      "com.lihaoyi" %% "mainargs" % "0.5.0",
+      "org.thymeleaf" % "thymeleaf" % "3.1.1.RELEASE",
+      "com.googlecode.libphonenumber" % "libphonenumber" % "8.13.16"
+    )
+  )

15-multi-step-form/default.nix

@@ -0,0 +1,101 @@
+{ pkgs, lib, sbt-derivation }:
+
+let
+  pname = "multi-step-form";
+  package = sbt-derivation.lib.mkSbtDerivation {
+    inherit pkgs pname;
+    # ...and the rest of the arguments
+    version = "0.0.1";
+    src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+    nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
+    buildPhase = ''
+      tailwindcss -i ./src/input.css -o ./src/main/resources/public/output.css
+      sbt assembly
+    '';
+    installPhase = ''
+      mkdir -p $out/bin
+      cp target/scala-*/${pname}-assembly-*.jar $out/bin/${pname}.jar
+    '';
+
+    depsSha256 = "sha256-zG4e7ERdi/WxzACymaYUQ0x8v4/peGARuqPAK8xvBmE=";
+  };
+
+  module = { config, pkgs, ... }:
+    let cfg = config.services.${pname};
+    in {
+      options.services.${pname} = {
+        enable = lib.mkEnableOption "My frontendmentor exercise ${pname}";
+
+        port = lib.mkOption {
+          type = lib.types.int;
+          default = 8080;
+          description = "Port to listen on.";
+        };
+
+        host = lib.mkOption {
+          type = lib.types.str;
+          default = "localhost";
+          description = "Host to bind to.";
+        };
+
+        useNginx = lib.mkOption {
+          type = lib.types.bool;
+          default = true;
+          description = "Whether to use Nginx to proxy requests.";
+        };
+      };
+      config = lib.mkIf cfg.enable {
+        users.groups."${pname}-group" = { };
+        users.users."${pname}-user" = {
+          isSystemUser = true;
+          group = "${pname}-group";
+        };
+
+        systemd.services.${pname} =
+          let serverHost = if cfg.useNginx then "localhost" else cfg.host;
+          in {
+            description = "Exercise app ${pname}";
+            wantedBy = [ "multi-user.target" ];
+            after = [ "network.target" ];
+            startLimitIntervalSec = 30;
+            startLimitBurst = 10;
+            serviceConfig = {
+              ExecStart =
+                "${pkgs.jdk}/bin/java -jar ${package}/bin/${pname}.jar -p ${
+                  toString cfg.port
+                } --host ${serverHost}";
+              WorkingDirectory = "${package}/bin";
+              Restart = "on-failure";
+              User = "${pname}-user";
+              Group = "${pname}-group";
+            };
+          };
+
+        services.nginx = lib.mkIf cfg.useNginx {
+          virtualHosts.${cfg.host} = {
+            locations."/".proxyPass = "http://127.0.0.1:${toString cfg.port}";
+          };
+        };
+      };
+    };
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [ "${pkgs.jdk}/bin/java" "-jar" "${package}/bin/${pname}.jar" "--host" "0.0.0.0" ];
+      ExposedPorts = {
+        "8080/tcp" = {};
+      };
+    };
+  };
+  # image =     pkgs.dockerTools.buildLayeredImage { # so, wow, this works
+  #     name = "hello2";
+  #     tag = "latest";
+  #     config.Cmd = [ "${pkgs.hello}/bin/hello" ];
+  #   };
+in {
+  package = package;
+  module = module;
+  image = image;
+}

15-multi-step-form/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.9.0

15-multi-step-form/project/plugins.sbt

@@ -0,0 +1,3 @@
+addSbtPlugin("io.spray" % "sbt-revolver" % "0.10.0")
+
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.1")

15-multi-step-form/src/input.css

@@ -0,0 +1,33 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+html {
+    font-size: 16px;
+}
+
+/* path is relative to 'out.css' */
+@font-face {
+  font-family: 'Ubuntu';
+  src: url('fonts/Ubuntu-Regular.ttf') format('truetype');
+  font-weight: 400; /* Regular */
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Ubuntu';
+  src: url('fonts/Ubuntu-Medium.ttf') format('truetype');
+  font-weight: 600; /* Semibold */
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Ubuntu';
+  src: url('fonts/Ubuntu-Bold.ttf') format('truetype');
+  font-weight: 700; /* Bold */
+  font-style: normal;
+}
+
+/* div, p, button, ol, li, summary, article, h1 { */
+/*     outline: 1px solid red; */
+/* } */

15-multi-step-form/src/main/resources/public/images/bg-sidebar-desktop.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="274" height="568" fill="none" viewBox="0 0 274 568"><rect width="274" height="568" fill="#483EFF" rx="10"/><mask id="a" width="274" height="568" x="0" y="0" maskUnits="userSpaceOnUse" style="mask-type:alpha"><rect width="274" height="568" fill="#fff" rx="10"/></mask><g mask="url(#a)"><path fill="#6259FF" fill-rule="evenodd" d="M-34.692 543.101C3.247 632.538 168.767 685.017 211.96 612.52c43.194-72.497-66.099-85.653-104.735-160.569-38.635-74.916-68.657-121.674-124.482-104.607-55.824 17.068-55.375 106.32-17.436 195.757Z" clip-rule="evenodd"/><path fill="#F9818E" fill-rule="evenodd" d="M233.095 601.153c60.679-28.278 92.839-143.526 41.875-171.528-50.965-28.003-57.397 47.579-108.059 75.987-50.662 28.408-82.14 50.207-69.044 88.241 13.096 38.034 74.549 35.578 135.228 7.3Z" clip-rule="evenodd"/><path stroke="#fff" stroke-linecap="round" stroke-linejoin="bevel" stroke-width="5" d="m165.305 469.097 10.607-10.806M209.461 474.581l-12.506-10.503M187.56 488.991l-6.908 14.798"/><path fill="#FFAF7E" d="M.305 546.891c37.003 0 67-29.997 67-67s-29.997-67-67-67-67 29.997-67 67 29.997 67 67 67Z"/></g></svg>

15-multi-step-form/src/main/resources/public/images/bg-sidebar-mobile.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="375" height="172" viewBox="0 0 375 172"><defs><path id="a" d="M0 0h375v172H0z"/></defs><g fill="none" fill-rule="evenodd"><mask id="b" fill="#fff"><use xlink:href="#a"/></mask><use xlink:href="#a" fill="#483EFF"/><g mask="url(#b)"><g transform="translate(-151.029 -133.957)"><path fill="#6259FF" d="M79.546 349.634c54.547 128.646 292.524 204.132 354.626 99.852 62.102-104.28-95.035-123.204-150.583-230.963-55.547-107.759-98.711-175.015-178.973-150.466C24.354 92.607 25 220.987 79.546 349.634Z"/><ellipse cx="129.864" cy="258.711" fill="#FFAF7E" rx="96.329" ry="96.373"/><path fill="#F9818E" d="M464.88 433.146c87.31-40.69 133.585-206.525 60.253-246.82-73.333-40.293-82.587 68.465-155.485 109.343-72.898 40.877-118.192 72.245-99.348 126.973 18.845 54.728 107.27 51.194 194.58 10.504Z"/><g stroke="#FFF" stroke-linecap="round" stroke-linejoin="bevel" stroke-width="5"><path d="m367.336 243.125 15.263-15.549M430.872 251.016l-17.995-15.112M399.36 271.751l-9.94 21.293"/></g></g></g></g></svg>

15-multi-step-form/src/main/resources/public/images/icon-advanced.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><g fill="none" fill-rule="evenodd"><circle cx="20" cy="20" r="20" fill="#F9818E"/><path fill="#FFF" fill-rule="nonzero" d="M25.057 15H14.944C12.212 15 10 17.03 10 19.885c0 2.857 2.212 4.936 4.944 4.936h10.113c2.733 0 4.943-2.08 4.943-4.936S27.79 15 25.057 15ZM17.5 20.388c0 .12-.108.237-.234.237h-1.552v1.569c0 .126-.138.217-.259.217H14.5c-.118 0-.213-.086-.213-.203v-1.583h-1.569c-.126 0-.217-.139-.217-.26v-.956c0-.117.086-.213.202-.213h1.584v-1.554c0-.125.082-.231.203-.231h.989c.12 0 .236.108.236.234v1.551h1.555c.125 0 .231.083.231.204v.988Zm5.347.393a.862.862 0 0 1-.869-.855c0-.472.39-.856.869-.856.481 0 .87.384.87.856 0 .471-.389.855-.87.855Zm1.9 1.866a.86.86 0 0 1-.87-.852.86.86 0 0 1 .87-.855c.48 0 .87.38.87.855a.86.86 0 0 1-.87.852Zm0-3.736a.862.862 0 0 1-.87-.854c0-.472.39-.856.87-.856s.87.384.87.856a.862.862 0 0 1-.87.854Zm1.899 1.87a.862.862 0 0 1-.868-.855c0-.472.389-.856.868-.856s.868.384.868.856a.862.862 0 0 1-.868.855Z"/></g></svg>

15-multi-step-form/src/main/resources/public/images/icon-arcade.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><g fill="none" fill-rule="evenodd"><circle cx="20" cy="20" r="20" fill="#FFAF7E"/><path fill="#FFF" fill-rule="nonzero" d="M24.995 18.005h-3.998v5.998h-2v-5.998H15a1 1 0 0 0-1 1V29a1 1 0 0 0 1 1h9.995a1 1 0 0 0 1-1v-9.995a1 1 0 0 0-1-1Zm-5.997 8.996h-2v-1.999h2v2Zm2-11.175a2.999 2.999 0 1 0-2 0v2.18h2v-2.18Z"/></g></svg>

15-multi-step-form/src/main/resources/public/images/icon-checkmark.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="12" height="9" viewBox="0 0 12 9"><path fill="none" stroke="#FFF" stroke-width="2" d="m1 4 3.433 3.433L10.866 1"/></svg>

15-multi-step-form/src/main/resources/public/images/icon-pro.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><g fill="none" fill-rule="evenodd"><circle cx="20" cy="20" r="20" fill="#483EFF"/><path fill="#FFF" fill-rule="nonzero" d="M26.666 13H13.334A3.333 3.333 0 0 0 10 16.333v7.193a3.447 3.447 0 0 0 2.14 3.24c1.238.5 2.656.182 3.56-.8L18.52 23h2.96l2.82 2.966a3.2 3.2 0 0 0 3.56.8 3.447 3.447 0 0 0 2.14-3.24v-7.193A3.333 3.333 0 0 0 26.666 13Zm-9.333 6H16v1.333a.667.667 0 0 1-1.333 0V19h-1.333a.667.667 0 0 1 0-1.334h1.333v-1.333a.667.667 0 1 1 1.333 0v1.333h1.333a.667.667 0 1 1 0 1.334Zm7.333 2a2.667 2.667 0 1 1 0-5.333 2.667 2.667 0 0 1 0 5.333ZM26 18.333a1.333 1.333 0 1 1-2.667 0 1.333 1.333 0 0 1 2.667 0Z"/></g></svg>

15-multi-step-form/src/main/resources/public/images/icon-thank-you.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="80" height="80" viewBox="0 0 80 80"><g fill="none"><circle cx="40" cy="40" r="40" fill="#F9818E"/><path fill="#E96170" d="M48.464 79.167c.768-.15 1.53-.321 2.288-.515a40.04 40.04 0 0 0 3.794-1.266 40.043 40.043 0 0 0 3.657-1.63 40.046 40.046 0 0 0 12.463-9.898A40.063 40.063 0 0 0 78.3 51.89c.338-1.117.627-2.249.867-3.391L55.374 24.698a21.6 21.6 0 0 0-15.332-6.365 21.629 21.629 0 0 0-15.344 6.365c-8.486 8.489-8.486 22.205 0 30.694l23.766 23.775Z"/><path fill="#FFF" d="M40.003 18.333a21.58 21.58 0 0 1 15.31 6.351c8.471 8.471 8.471 22.158 0 30.63-8.47 8.47-22.156 8.47-30.627 0-8.47-8.472-8.47-22.159 0-30.63a21.594 21.594 0 0 1 15.317-6.35Zm9.865 15c-.316.028-.622.15-.872.344l-12.168 9.13-5.641-5.642c-1.224-1.275-3.63 1.132-2.356 2.356l6.663 6.663c.56.56 1.539.63 2.173.156l13.326-9.995c1.122-.816.43-2.993-.956-3.013a1.666 1.666 0 0 0-.17 0Z"/></g></svg>

15-multi-step-form/src/main/resources/public/images/tail-spin.svg

@@ -0,0 +1,32 @@
+<!-- By Sam Herbert (@sherb), for everyone. More @ http://goo.gl/7AJzbL -->
+<svg width="38" height="38" viewBox="0 0 38 38" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <linearGradient x1="8.042%" y1="0%" x2="65.682%" y2="23.865%" id="a">
+            <stop stop-color="hsl(228, 100%, 84%)" stop-opacity="0" offset="0%"/>
+            <stop stop-color="hsl(228, 100%, 84%)" stop-opacity=".631" offset="63.146%"/>
+            <stop stop-color="hsl(228, 100%, 84%)" offset="100%"/>
+        </linearGradient>
+    </defs>
+    <g fill="none" fill-rule="evenodd">
+        <g transform="translate(1 1)">
+            <path d="M36 18c0-9.94-8.06-18-18-18" id="Oval-2" stroke="url(#a)" stroke-width="2">
+                <animateTransform
+                    attributeName="transform"
+                    type="rotate"
+                    from="0 18 18"
+                    to="360 18 18"
+                    dur="0.9s"
+                    repeatCount="indefinite" />
+            </path>
+            <circle fill="#fff" cx="36" cy="18" r="1">
+                <animateTransform
+                    attributeName="transform"
+                    type="rotate"
+                    from="0 18 18"
+                    to="360 18 18"
+                    dur="0.9s"
+                    repeatCount="indefinite" />
+            </circle>
+        </g>
+    </g>
+</svg>

15-multi-step-form/src/main/resources/templates/_index.html

@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="x-ua-compatible" content="ie=edge" />
+    <title>TEst</title>
+    <meta name="description" content="" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+
+    <link href="../public/out.css" rel="stylesheet" />
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
+    <!-- Place favicon.ico in the root directory -->
+  </head>
+  <body>
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <main class="bg-green-200">
+      <h1 class="text-3xl">Hello!</h1>
+      <secion>
+        <p>into the template</p>
+      </secion>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/index.html

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      th:href="'public/images/favicon-32x32.png'"
+      href="../public/images/favicon-32x32.png"
+    />
+    <link
+      th:href="'public/out.css'"
+      href="../public/out.css"
+      rel="stylesheet"
+    />
+    <script th:src="'public/htmx.min.js'" src="../public/htmx.min.js"></script>
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body>
+    <main class="grid place-content-center w-screen h-screen bg-magnolia">
+      <section hx-get="/get-form" hx-trigger="load" hx-swap="outerHTML">
+        <!-- here be immediate hx-get for the form. to subscitute the body -->
+        <img
+          class="w-14 text-green-500 fill-current"
+          th:src="'public/images/tail-spin.svg'"
+          src="../public/images/tail-spin.svg"
+          alt="loading..."
+        />
+      </section>
+
+      <section class="absolute top-0 end-0" id="new-session-control">
+        <button hx-get="/force-new-session">Request new session</button>
+      </section>
+      <div class="fixed inset-x-0 bottom-0 attribution">
+        Challenge by
+        <a href="https://www.frontendmentor.io?ref=challenge" target="_blank"
+          >Frontend Mentor</a
+        >. Source code at
+        <a href="https://github.com/efim/Learning-HTMX">Your Name Here</a>.
+      </div>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/step1.html

@@ -0,0 +1,233 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      href="./assets/images/favicon-32x32.png"
+    />
+    <link href="../public/out.css" rel="stylesheet" />
+
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body class="grid place-content-center h-screen bg-magnolia">
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <form
+      class="flex flex-col items-center w-screen h-screen md:grid md:items-start md:p-5 md:bg-white md:rounded-2xl md:grid-cols-[auto_1fr] md:w-desktop-form md:h-desktop-form md:drop-shadow-2xl"
+      id="form-step"
+      th:fragment="formFragment(formData)"
+      hx-post="/submit-step/1/2"
+      hx-swap="outerHTML"
+      action="/submit-step/1/2"
+      method="post"
+    >
+      <summary
+        class="w-full h-44 bg-no-repeat bg-cover md:row-span-2 md:tracking-widest bg-sidebar-mobile marker:text-white md:bg-sidebar-desktop md:h-[568px] md:w-[274px]"
+        id="sidebar"
+        th:fragment="stepsSummary(formData)"
+      >
+        <ol
+          class="grid grid-cols-[repeat(4,_auto)] gap-x-5 content-center items-center place-content-center h-24 md:flex-col md:h-full md:grid-rows-[repeat(4,_auto)] md:grid-cols-1 md:content-start md:p-10 md:gap-y-7 text-white text-sm uppercase"
+        >
+          <li
+            class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]"
+            th:each="stepNum: ${formData.stepsAmount}"
+          >
+            <div
+              class="grid place-content-center w-8 h-8 font-bold text-white rounded-full border border-white"
+              th:classappend="${stepNum.index} == ${formData.userAnswers.currentStep} ? '!bg-light-blue !text-marine-blue'"
+              th:text="${stepNum.index}"
+            >
+              1
+            </div>
+            <p class="hidden md:flex md:flex-col">
+              <span class="text-light-gray"
+                >Step <span th:text="${stepNum.index}">1</span></span
+              ><span class="font-bold" th:text="${stepNum.name}"
+                >Your info</span
+              >
+            </p>
+          </li>
+          <li
+            class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]"
+            th:remove="all"
+          >
+            <div
+              class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+            >
+              2
+            </div>
+            <p class="hidden md:flex md:flex-col">
+              <span class="text-light-gray">Step 2</span
+              ><span class="font-bold">Select plan</span>
+            </p>
+          </li>
+          <li
+            class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]"
+            th:remove="all"
+          >
+            <div
+              class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+            >
+              3
+            </div>
+            <p class="hidden md:flex md:flex-col">
+              <span class="text-light-gray">Step 3</span
+              ><span class="font-bold">Add-ons</span>
+            </p>
+          </li>
+          <li
+            class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]"
+            th:remove="all"
+          >
+            <div
+              class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+            >
+              4
+            </div>
+            <p class="hidden md:flex md:flex-col">
+              <span class="text-light-gray">Step 4</span
+              ><span class="font-bold">summary</span>
+            </p>
+          </li>
+        </ol>
+      </summary>
+      <section
+        id="multipage-form-container"
+        class="flex flex-col py-8 px-6 -mt-20 w-11/12 bg-white rounded-xl md:px-24 md:mt-0 md:w-full drop-shadow-xl md:drop-shadow-none"
+      >
+        <!-- Step 1 start -->
+        <h1 class="text-2xl font-bold md:text-4xl text-marine-blue">
+          Personal info
+        </h1>
+        <p class="py-3 text-cool-gray">
+          Please provide your name, email address, and phone number.
+        </p>
+        <div class="contents">
+          <label
+            for="name"
+            class="pt-3 text-sm md:pt-5 md:pb-2 text-marine-blue"
+            >Name</label
+          >
+          <input
+            id="name"
+            th:value="${formData.userAnswers.step1.name}"
+            name="name"
+            type="text"
+            required
+            placeholder="e.g. Stephen King"
+            class="p-1 px-4 h-10 text-sm font-semibold rounded border md:p-6 md:px-4 md:text-base md:rounded-lg focus:outline-none placeholder:text-cool-gray invalid:border-strawberry-red focus:border-marine-blue"
+          />
+        </div>
+        <div class="contents">
+          <label
+            for="email"
+            class="pt-3 text-sm md:pt-5 md:pb-2 text-marine-blue"
+            >Email Address</label
+          >
+          <input
+            id="email"
+            th:value="${formData.userAnswers.step1.email}"
+            name="email"
+            type="email"
+            required
+            placeholder="e.g. stephenking@lorem.com"
+            class="p-1 px-4 h-10 text-sm font-semibold rounded border md:p-6 md:px-4 md:text-base md:rounded-lg focus:outline-none placeholder:text-cool-gray invalid:border-strawberry-red focus:border-marine-blue"
+          />
+        </div>
+        <!-- Following is email input field
+             it has outer div that sets separate 'value' variable
+             and innder div which denotes fragment, parametrized by this only variable
+             now i should be able to render only this input field as fragment -->
+        <div
+          th:with="value=${formData.userAnswers.step1.phone},error=''"
+          class="contents relative"
+        >
+          <div
+            class="contents"
+            hx-target="this"
+            hx-swap="outerHTML"
+            th:fragment="email-input (value,error)"
+          >
+            <label
+              for="phone"
+              class="pt-3 text-sm md:pt-5 md:pb-2 text-marine-blue"
+              >Phone Number</label
+            >
+            <input
+              id="phone"
+              th:value="${value}"
+              name="phone"
+              type="tel"
+              required
+              placeholder="e.g. +1 234 567 890"
+              class="p-1 px-4 h-10 text-sm font-semibold rounded border md:p-6 md:px-4 md:text-base md:rounded-lg focus:outline-none placeholder:text-cool-gray invalid:border-strawberry-red focus:border-marine-blue"
+              th:classappend="${!error.isEmpty} ? 'border-strawberry-red' : ''"
+              hx-post="/step1/phonenumber"
+              hx-indicator="#ind"
+            />
+            <div
+              th:if="${error} != null"
+              th:text="${error}"
+              class="text-sm text-strawberry-red">Please enter valid phone number</div>
+            <img
+              id="ind"
+              src="../public/images/tail-spin.svg"
+              th:src="'public/images/tail-spin.svg'"
+              class="absolute w-14 h-14 htmx-indicator"
+            />
+          </div>
+        </div>
+
+        <!-- Step 1 end -->
+      </section>
+      <div class="md:hidden grow"></div>
+      <section
+        id="footer-controls"
+        class="flex flex-row items-center py-4 w-full bg-white md:items-end md:h-full"
+      >
+        <div class="grow"></div>
+        <input
+          type="submit"
+          class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+          value="Next Step"
+        />
+        <a
+          th:remove="all"
+          href="step2.html"
+          class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+          >Next Step</a
+        >
+      </section>
+    </form>
+    <div class="fixed inset-x-0 bottom-0 attribution">
+      Challenge by
+      <a href="https://www.frontendmentor.io?ref=challenge" target="_blank"
+        >Frontend Mentor</a
+      >. Coded by <a href="#">Your Name Here</a>.
+    </div>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/step2.html

@@ -0,0 +1,260 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      href="./assets/images/favicon-32x32.png"
+    />
+    <link href="../public/out.css" rel="stylesheet" />
+
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body>
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <main class="grid place-content-center h-screen">
+      <form
+        class="flex flex-col items-center w-screen h-screen md:grid md:items-start md:p-5 md:bg-white md:rounded-2xl md:grid-cols-[auto_1fr] md:w-desktop-form md:h-desktop-form md:drop-shadow-2xl"
+        id="form-step"
+        hx-post="/submit-step/2/3"
+        hx-swap="outerHTML"
+        action="/submit-step/2/3"
+        method="post"
+        th:fragment="formFragment(formData)"
+      >
+        <summary
+          class="w-full h-44 bg-no-repeat md:row-span-2 bg-sidebar-mobile marker:text-white md:bg-sidebar-desktop md:h-[568px] md:w-[274px]"
+          id="sidebar"
+          th:replace="~{step1::stepsSummary (${formData})}"
+        >
+          <ol
+            class="grid grid-cols-[repeat(4,_auto)] gap-x-5 content-center items-center place-content-center h-24 md:flex-col md:h-full md:grid-rows-[repeat(4,_auto)] md:grid-cols-1 md:content-start md:p-10 md:gap-y-7 text-white text-sm uppercase"
+          >
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                1
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 1</span
+                ><span class="font-bold">Your info</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                2
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 2</span
+                ><span class="font-bold">Select plan</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                3
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 3</span
+                ><span class="font-bold">Add-ons</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                4
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 4</span
+                ><span class="font-bold">summary</span>
+              </p>
+            </li>
+          </ol>
+        </summary>
+        <section
+          id="multipage-form-container"
+          class="flex flex-col py-8 px-6 -mt-20 w-11/12 bg-white rounded-xl md:px-24 md:mt-0 md:w-full drop-shadow-xl md:drop-shadow-none"
+        >
+          <!-- Step 2 start -->
+          <h1 class="text-2xl font-bold md:text-4xl text-marine-blue">
+            Select your plan
+          </h1>
+          <p class="py-3 mb-4 text-cool-gray">
+            You have the option of monthly or yearly billing.
+          </p>
+          <div
+            class="flex flex-col gap-y-3 my-3 w-full md:flex-row md:gap-x-4"
+            id="plan-type-inputs"
+            th:fragment="planTypesInputs(formData)"
+          >
+            <label
+              for="ArcadePlanType"
+              class="relative h-20 md:h-40 md:grow"
+              th:each="planType: ${formData.availablePlans}"
+              th:for="${planType}"
+            >
+              <input
+                id="ArcadePlanType"
+                th:id="${planType}"
+                type="radio"
+                name="plan-type"
+                value="Arcade"
+                th:value="${planType}"
+                class="hidden peer"
+                th:checked="${formData.userAnswers.step2.planType.toString()} == ${planType.toString()}"
+                checked
+              />
+              <div
+                class="grid absolute inset-y-0 inset-x-0 place-content-center h-full rounded-lg border md:grid-cols-1 md:p-4 grid-cols-[auto_1fr] border-light-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia/50 md:grid-rows-[1fr_auto_auto] hover:bg-magnolia/[.1] hover:border-purplish-blue"
+              >
+                <img
+                  class="place-self-center px-4 md:row-span-1 md:place-self-start md:px-0"
+                  th:src="${planType.iconPath}" src="../public/images/icon-arcade.svg" alt="" />
+                <div class="flex flex-col items-start">
+                  <h2 th:text="${planType}" class="font-semibold text-marine-blue">Arcade</h2>
+                  <p
+                    th:text="|$${formData.planCost(planType)}/${formData.periodCostLabel}|"
+                    class="text-sm text-cool-gray"
+                  >
+                    $9/mo
+                  </p>
+                  <p th:if="${formData.userAnswers.step2.isYearly}" class="text-xs text-marine-blue">
+                    2 months free
+                  </p>
+                </div>
+              </div>
+            </label>
+
+            <label
+              for="AdvancedPlanType"
+              class="relative h-20 md:w-32"
+              th:remove="all"
+            >
+              <input
+                id="AdvancedPlanType"
+                type="radio"
+                name="plan-type"
+                value="Advanced"
+                class="hidden peer"
+                th:checked="${formData.userAnswers.step2.planType.toString()} == 'Advanced'"
+              />
+              <div
+                class="absolute inset-y-0 inset-x-0 rounded-lg border border-cool-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia"
+              >
+                <img src="../public/images/icon-advanced.svg" alt="" />
+                <h2>Advanced</h2>
+              </div>
+            </label>
+
+            <label
+              for="ProPlanType"
+              class="relative h-20 md:w-32"
+              th:remove="all"
+            >
+              <input
+                id="ProPlanType"
+                type="radio"
+                name="plan-type"
+                value="Pro"
+                class="hidden peer"
+                th:checked="${formData.userAnswers.step2.planType.toString()} == 'Pro'"
+              />
+              <div
+                class="absolute inset-y-0 inset-x-0 rounded-lg border border-cool-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia"
+              >
+                <img src="../public/images/icon-pro.svg" alt="" />
+                <h2>Pro</h2>
+              </div>
+            </label>
+          </div>
+
+          <div
+            class="grid grid-flow-col-dense place-content-center mt-3 w-full rounded-lg md:mt-5 bg-light-gray/25"
+          >
+            <div
+              class="inline-grid grid-cols-3 place-items-center h-12 text-sm font-bold"
+            >
+              <input
+                class="mr-2 w-9 h-5 ml-2 rounded-full appearance-none mt-[0.3rem] bg-marine-blue after:absolute after:h-3 after:w-3 after:rounded-full after:border-none after:bg-neutral-100 after:transition-[background-color_0.2s,transform_0.2s] checked:after:ml-[1.2rem] after:ml-[0.25rem] after:mt-[0.25rem] hover:cursor-pointer col-start-2 row-start-1 peer md:mx-4"
+                type="checkbox"
+                name="isPackageYearly"
+                role="switch"
+                id="packageDuration"
+                th:checked="${formData.userAnswers.step2.isYearly}"
+                hx-post="/step2/planTypeInputs"
+                hx-target="#plan-type-inputs"
+                hx-swap="outerHTML"
+              />
+              <p
+                class="row-start-1 text-marine-blue peer-checked:text-cool-gray"
+              >
+                Monthly
+              </p>
+              <p
+                class="row-start-1 text-cool-gray peer-checked:text-marine-blue"
+              >
+                Yearly
+              </p>
+            </div>
+          </div>
+
+          <!-- Step 2 end -->
+        </section>
+        <div class="md:hidden grow"></div>
+        <section
+          id="footer-controls"
+          class="flex flex-row items-center py-4 w-full bg-white md:items-end md:h-full"
+        >
+          <a
+            hx-post="/submit-step/2/1"
+            hx-swap="outerHTML"
+            hx-target="#form-step"
+            href="step1.html"
+            class="ml-6 text-sm font-semibold md:pb-3 md:ml-24 md:text-base text-cool-gray"
+            >Go Back</a
+          >
+          <div class="grow"></div>
+          <input
+            type="submit"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+            value="Next Step"
+          />
+          <a
+            th:remove="all"
+            href="step3.html"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+            >Next Step</a
+          >
+        </section>
+      </form>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/step3.html

@@ -0,0 +1,241 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      href="./assets/images/favicon-32x32.png"
+    />
+    <link href="../public/out.css" rel="stylesheet" />
+
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body>
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <main class="grid place-content-center h-screen">
+      <form
+        class="flex flex-col items-center w-screen h-screen md:grid md:items-start md:p-5 md:bg-white md:rounded-2xl md:grid-cols-[auto_1fr] md:w-desktop-form md:h-desktop-form md:drop-shadow-2xl"
+        id="form-step"
+        hx-post="/submit-step/3/4"
+        hx-swap="outerHTML"
+        action="/submit-step/3/4"
+        method="post"
+        th:fragment="formFragment(formData)"
+      >
+        <summary
+          class="w-full h-44 bg-no-repeat md:row-span-2 bg-sidebar-mobile marker:text-white md:bg-sidebar-desktop md:h-[568px] md:w-[274px]"
+          id="sidebar"
+          th:replace="~{step1::stepsSummary (${formData})}"
+        >
+          <ol
+            class="grid grid-cols-[repeat(4,_auto)] gap-x-5 content-center items-center place-content-center h-24 md:flex-col md:h-full md:grid-rows-[repeat(4,_auto)] md:grid-cols-1 md:content-start md:p-10 md:gap-y-7 text-white text-sm uppercase"
+          >
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                1
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 1</span
+                ><span class="font-bold">Your info</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                2
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 2</span
+                ><span class="font-bold">Select plan</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                3
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 3</span
+                ><span class="font-bold">Add-ons</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                4
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 4</span
+                ><span class="font-bold">summary</span>
+              </p>
+            </li>
+          </ol>
+        </summary>
+        <section
+          id="multipage-form-container"
+          class="flex flex-col py-8 px-6 -mt-20 w-11/12 bg-white rounded-xl md:px-24 md:mt-0 md:w-full drop-shadow-xl md:drop-shadow-none"
+        >
+          <!-- Step 3 start -->
+          <h1 class="text-2xl font-bold md:text-4xl text-marine-blue">
+            Pick add-ons
+          </h1>
+          <p class="py-3 md:pb-10 text-cool-gray">
+            Add-ons help enhance your gaming experience.
+          </p>
+          <div class="flex flex-col gap-y-3 w-full text-sm md:text-base">
+            <label
+              th:each="addon: ${formData.availableAddons}"
+              for="multiplayer-games"
+              th:for="${addon}"
+              class="relative pl-5 h-16 md:w-full md:h-20"
+            >
+              <input
+                id="multiplayer-games"
+                th:id="${addon}"
+                type="checkbox"
+                value="OnlineService"
+                th:value="${addon}"
+                name="addon-services"
+                class="absolute z-40 my-5 w-6 h-6 text-white rounded-lg border md:my-7 accent-purplish-blue border-light-gray peer"
+                th:checked="${formData.userAnswers.step3.containsAddon(addon)}"
+              />
+              <div
+                class="absolute inset-y-0 inset-x-0 z-20 rounded-lg border border-cool-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia/75 hover:bg-magnolia/[.1] hover:border-purplish-blue"
+              >
+                <div
+                  class="grid place-content-center ml-16 h-full grid-cols-[1fr_70px]"
+                >
+                  <h1 th:text="${addon.name}"
+                      class="font-bold text-marine-blue"
+                  >Online Service</h1>
+                  <p th:text="${addon.description}"
+                     class="text-xs text-cool-gray"
+                  >
+                    Access to multiplayer games
+                  </p>
+                  <p
+                    class="col-start-2 row-span-2 row-start-1 self-center text-purplish-blue"
+                    th:text="|+$${formData.addonCost(addon)}/${formData.periodCostLabel}|"
+                  >
+                    +$1/mo
+                  </p>
+                </div>
+              </div>
+            </label>
+            <label
+              for="larger-storage"
+              class="relative pl-6 h-20 md:w-full"
+              th:remove="all"
+            >
+              <input
+                id="larger-storage"
+                type="checkbox"
+                name="addon-services"
+                value="LargerStorage"
+                class="my-7 w-6 h-6 peer"
+                th:checked="${formData.userAnswers.step3.containsAddon('LargerStorage')}"
+              />
+              <div
+                class="absolute inset-y-0 inset-x-0 rounded-lg border border-cool-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia/50"
+              >
+                <div
+                  class="grid place-content-center ml-20 h-full grid-cols-[1fr_100px]"
+                >
+                  <h1>Larger storage</h1>
+                  <p>Extra 1TB of cloud save</p>
+                  <p class="col-start-2 row-span-2 row-start-1 self-center">
+                    +$2/mo
+                  </p>
+                </div>
+              </div>
+            </label>
+            <label
+              for="custom-profile"
+              class="relative pl-6 h-20 md:w-full"
+              th:remove="all"
+            >
+              <input
+                id="custom-profile"
+                type="checkbox"
+                name="addon-services"
+                value="CustomProfile"
+                class="my-7 w-6 h-6 peer"
+                th:checked="${formData.userAnswers.step3.containsAddon('CustomProfile')}"
+              />
+              <div
+                class="absolute inset-y-0 inset-x-0 rounded-lg border border-cool-gray peer-checked:border-purplish-blue peer-checked:bg-magnolia/50"
+              >
+                <div
+                  class="grid place-content-center ml-20 h-full grid-cols-[1fr_100px]"
+                >
+                  <h1>Customizable Profile</h1>
+                  <p>Custom theme on your profile</p>
+                  <p class="col-start-2 row-span-2 row-start-1 self-center">
+                    +$2/mo
+                  </p>
+                </div>
+              </div>
+            </label>
+          </div>
+
+          <!-- Step 3 end -->
+        </section>
+        <div class="md:hidden grow"></div>
+        <section
+          id="footer-controls"
+          class="flex flex-row items-center py-4 w-full bg-white md:items-end md:h-full"
+        >
+          <a
+            hx-post="/submit-step/3/2"
+            hx-swap="outerHTML"
+            hx-target="#form-step"
+            href="step2.html"
+            class="ml-6 text-sm font-semibold md:pb-3 md:ml-24 md:text-base text-cool-gray"
+            >Go Back</a
+          >
+          <div class="grow"></div>
+          <input
+            type="submit"
+            href="step4.html"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+            value="Next Step"
+          />
+          <a
+            th:remove="all"
+            href="step4.html"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-marine-blue"
+            >Next Step</a
+          >
+        </section>
+      </form>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/step4.html

@@ -0,0 +1,204 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      href="./assets/images/favicon-32x32.png"
+    />
+    <link href="../public/out.css" rel="stylesheet" />
+
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body>
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <main class="grid place-content-center h-screen">
+      <form
+        class="flex flex-col items-center w-screen h-screen md:grid md:items-start md:p-5 md:bg-white md:rounded-2xl md:grid-cols-[auto_1fr] md:w-desktop-form md:h-desktop-form md:drop-shadow-2xl"
+        id="form-step"
+        hx-post="/submit-step/4/5"
+        action="/submit-step/4/5"
+        hx-swap="outerHTML"
+        method="post"
+        th:fragment="formFragment(formData)"
+      >
+        <summary
+          class="w-full h-44 bg-no-repeat md:row-span-2 bg-sidebar-mobile marker:text-white md:bg-sidebar-desktop md:h-[568px] md:w-[274px]"
+          id="sidebar"
+          th:replace="~{step1::stepsSummary (${formData})}"
+        >
+          <ol
+            class="grid grid-cols-[repeat(4,_auto)] gap-x-5 content-center items-center place-content-center h-24 md:flex-col md:h-full md:grid-rows-[repeat(4,_auto)] md:grid-cols-1 md:content-start md:p-10 md:gap-y-7 text-white text-sm uppercase"
+          >
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                1
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 1</span
+                ><span class="font-bold">Your info</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                2
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 2</span
+                ><span class="font-bold">Select plan</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                3
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 3</span
+                ><span class="font-bold">Add-ons</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                4
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 4</span
+                ><span class="font-bold">summary</span>
+              </p>
+            </li>
+          </ol>
+        </summary>
+        <section
+          id="multipage-form-container"
+          class="flex flex-col py-8 px-6 -mt-20 w-11/12 bg-white rounded-xl md:px-24 md:mt-0 md:w-full drop-shadow-xl md:drop-shadow-none"
+        >
+          <!-- Step 3 start -->
+          <h1 class="text-2xl font-bold md:text-4xl text-marine-blue">
+            Finishing up
+          </h1>
+          <p class="pt-3 pb-5 md:pb-8 text-cool-gray">
+            Double-check everything looks OK before confirming.
+          </p>
+          <div
+            class="flex flex-col w-full text-sm rounded-lg divide-y md:text-base bg-magnolia/75"
+            id="selection-overview"
+          >
+            <div id="selected-plan" class="grid p-3 md:p-6 grid-cols-[1fr_auto]">
+              <h2 th:text="${formData.fullPlanName}"
+                  class="font-bold text-marine-blue"
+              >Arcade (Monthly)</h2>
+              <p
+                th:text="|$${formData.selectedPlanCost}/${formData.periodCostLabel}|"
+                class="row-span-2 self-end font-bold text-marine-blue"
+              >
+                $90/y
+              </p>
+              <a
+                hx-post="/submit-step/4/2"
+                hx-swap="outerHTML"
+                hx-target="#form-step"
+                href="step3.html"
+                hx-params="not form-confirmed"
+                class="underline text-cool-gray"
+                >Change</a
+              >
+            </div>
+            <div id="selected-addons" class="flex flex-col gap-y-4 p-3 md:p-6 mp-10"
+                 th:if="not ${formData.userAnswers.step3.addonsAsJava.isEmpty}"
+            >
+              <div
+                th:each="addon: ${formData.userAnswers.step3.addonsAsJava}"
+                class="flex flex-row"
+              >
+                <p th:text="${addon.name}" class="grow text-cool-gray">Online service</p>
+                <p
+                  th:text="|+$${formData.addonCost(addon)}/${formData.periodCostLabel}|"
+                >
+                  +$10/yr
+                </p>
+              </div>
+              <div th:remove="all">Larger storage +$20/yr</div>
+            </div>
+          </div>
+
+          <section class="flex flex-row p-3 mt-5 md:px-6">
+            <p class="grow text-cool-gray">
+              Total (per
+              <span
+                th:text="${formData.userAnswers.step2.isYearly} ? 'year' : 'month'"
+                >year</span
+              >)
+            </p>
+            <p
+              th:text="|+$${formData.fullOrderPrice}/${formData.periodCostLabel}|"
+              class="font-bold md:text-lg text-purplish-blue"
+            >
+              $120
+            </p>
+          </section>
+
+          <!-- Step 3 end -->
+        </section>
+        <div class="md:hidden grow"></div>
+        <section
+          id="footer-controls"
+          class="flex flex-row items-center py-4 w-full bg-white md:items-end md:h-full"
+        >
+          <a
+            hx-post="/submit-step/4/3"
+            hx-swap="outerHTML"
+            hx-target="#form-step"
+            href="step3.html"
+            class="ml-6 text-sm font-semibold md:pb-3 md:ml-24 md:text-base text-cool-gray"
+            hx-params="not form-confirmed"
+            >Go Back</a
+          >
+          <div class="grow"></div>
+          <input type="hidden" name="form-confirmed" value="true" />
+          <input
+            type="submit"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-purplish-blue"
+            value="Confirm"
+          />
+          <a
+            th:remove="all"
+            href="step5.html"
+            class="grid place-content-center mr-3 w-24 h-10 text-sm font-semibold text-white rounded md:mr-24 md:w-32 md:h-12 md:text-base md:rounded-lg bg-purplish-blue"
+            >Confirm</a
+          >
+        </section>
+      </form>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/resources/templates/step5.html

@@ -0,0 +1,119 @@
+<!DOCTYPE html>
+<html class="no-js" lang="">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- displays site properly based on user's device -->
+
+    <link
+      rel="icon"
+      type="image/png"
+      sizes="32x32"
+      href="./assets/images/favicon-32x32.png"
+    />
+    <link href="../public/out.css" rel="stylesheet" />
+
+    <title>Frontend Mentor | Multi-step form</title>
+
+    <!-- Feel free to remove these styles or customise in your own stylesheet 👍 -->
+    <style>
+      .attribution {
+        font-size: 11px;
+        text-align: center;
+      }
+      .attribution a {
+        color: hsl(228, 45%, 44%);
+      }
+    </style>
+  </head>
+  <body>
+    <!--[if lt IE 8]>
+      <p class="browserupgrade">
+        You are using an <strong>outdated</strong> browser. Please
+        <a href="http://browsehappy.com/">upgrade your browser</a> to improve
+        your experience.
+      </p>
+    <![endif]-->
+
+    <main class="grid place-content-center h-screen">
+      <article
+        class="flex flex-col items-center w-screen h-screen md:grid md:items-start md:p-5 md:bg-white md:rounded-2xl md:grid-cols-[auto_1fr] md:w-desktop-form md:h-desktop-form md:drop-shadow-2xl"
+        id="form-step"
+        th:fragment="formFragment(formData)"
+      >
+        <summary
+          class="w-full h-44 bg-no-repeat md:row-span-2 bg-sidebar-mobile marker:text-white md:bg-sidebar-desktop md:h-[568px] md:w-[274px]"
+          id="sidebar"
+          th:replace="~{step1::stepsSummary (${formData})}"
+        >
+          <ol
+            class="grid grid-cols-[repeat(4,_auto)] gap-x-5 content-center items-center place-content-center h-24 md:flex-col md:h-full md:grid-rows-[repeat(4,_auto)] md:grid-cols-1 md:content-start md:p-10 md:gap-y-7 text-white text-sm uppercase"
+          >
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                1
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 1</span
+                ><span class="font-bold">Your info</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                2
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 2</span
+                ><span class="font-bold">Select plan</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                3
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 3</span
+                ><span class="font-bold">Add-ons</span>
+              </p>
+            </li>
+            <li class="items-center md:grid md:gap-x-4 md:grid-cols-[auto_1fr]">
+              <div
+                class="grid place-content-center w-8 h-8 text-white rounded-full border border-white"
+              >
+                4
+              </div>
+              <p class="hidden md:flex md:flex-col">
+                <span class="text-light-gray">Step 4</span
+                ><span class="font-bold">summary</span>
+              </p>
+            </li>
+          </ol>
+        </summary>
+        <section
+          id="multipage-form-container"
+          class="flex flex-col gap-y-4 items-center py-20 px-8 -mt-20 w-11/12 bg-white rounded-xl md:row-span-2 md:justify-center md:px-24 md:mt-0 md:w-full md:h-full drop-shadow-xl md:drop-shadow-none"
+        >
+            <!-- Step 5 start -->
+
+          <img src="../public/images/icon-thank-you.svg" alt="" class="mb-2 w-14 h-14 md:w-20 md:h-20" />
+          <h2 class="text-2xl font-bold md:mt-2 md:text-4xl text-marine-blue">Thank you!</h2>
+          <p class="text-center text-cool-gray">
+            Thanks for confirming your subscription! We hope you have fun
+            using our platform. If you ever need support, please feel free
+            to email us at support@loremgaming.com.
+          </p>
+
+  <!-- Step 5 end -->
+
+        </section>
+        <div class="md:hidden grow"></div>
+      </article>
+    </main>
+  </body>
+</html>

15-multi-step-form/src/main/scala/multistepform/Main.scala

@@ -0,0 +1,22 @@
+package multistepform
+
+import mainargs.{main, arg, ParserForMethods}
+
+object Main {
+  @main def run(
+    @arg(name="port", short='p', doc="Port on which server will start service")
+      portArg: Int = 8080,
+    @arg(name="host", doc="Host on which server will start serving")
+      hostArg: String = "localhost"
+  ): Unit = {
+    println(s"Will start server on ${hostArg}:${portArg}")
+    val server = new cask.Main {
+      override def allRoutes: Seq[cask.main.Routes] = Seq(Routes())
+      override def port: Int = portArg
+      override def host: String = hostArg
+    }
+    server.main(Array.empty)
+  }
+
+  def main(args: Array[String]): Unit = ParserForMethods(this).runOrExit(args)
+}

15-multi-step-form/src/main/scala/multistepform/Models.scala

@@ -0,0 +1,219 @@
+package multistepform
+
+import java.util.UUID
+import scala.jdk.CollectionConverters._
+
+object Models {
+
+  /** Labels and form info which dynamically depend on user answers e.g plan
+    * name 'Arcade (Yearly)' vs 'Pro (Monthly)'
+    */
+  final case class FormData(
+      userAnswers: Answers
+  ) {
+    val stepsAmount = Steps.values.toList.asJava
+
+    // yeah, in real world it will not be this simple
+    def yearlyCost(monthlyCost: Int): Int = 10 * monthlyCost
+
+    def periodCostLabel: String = {
+      if (userAnswers.step2.isYearly) "yr" else "mo"
+    }
+
+    def selectedPlanCost: Int = planCost(userAnswers.step2.planType)
+
+    def planCost(plan: PlanType): Int = {
+      val monthlyPlanCost = plan.monthlyCost
+      if (userAnswers.step2.isYearly) yearlyCost(monthlyPlanCost)
+      else monthlyPlanCost
+    }
+
+    def addonCost(addon: Addons): Int = {
+      val monthCost = addon.monthlyCost
+      if (userAnswers.step2.isYearly) yearlyCost(monthCost) else monthCost
+    }
+
+    def fullPlanName: String = {
+      val period = if (userAnswers.step2.isYearly) "Yearly" else "Monthly"
+      s"${userAnswers.step2.planType} (${period})"
+    }
+
+    def fullOrderPrice: Int = {
+      selectedPlanCost + userAnswers.step3.addons.toList.map(addonCost).sum
+    }
+
+    def availablePlans = PlanType.values.toList.asJava
+
+    def availableAddons = Addons.values.toList.asJava
+  }
+
+  final case class Answers(
+      sessionId: String = "",
+      currentStep: Int = 1,
+      step1: StepAnswers.Step1 = StepAnswers.Step1(),
+      step2: StepAnswers.Step2 = StepAnswers.Step2(),
+      step3: StepAnswers.Step3 = StepAnswers.Step3(),
+      step4: StepAnswers.Step4 = StepAnswers.Step4()
+  ) {
+    // this is not enforced by compiler, sad, maintain by hand in html template files
+    def fragmentName: String = s"step${currentStep}"
+
+    def updateStep(stepNum: Int, rawData: String, nextStep: Int): Answers = {
+      stepNum match {
+        case 1 =>
+          this.copy(
+            step1 = this.step1.fromFormData(rawData),
+            currentStep = nextStep
+          )
+        case 2 =>
+          this.copy(
+            step2 = this.step2.fromFormData(rawData),
+            currentStep = nextStep
+          )
+        case 3 =>
+          this.copy(
+            step3 = this.step3.fromFormData(rawData),
+            currentStep = nextStep
+          )
+        case 4 =>
+          this.copy(
+            step4 = this.step4.fromFormData(rawData),
+            currentStep = nextStep
+          )
+        case _ => this
+      }
+    }
+  }
+
+  /** TODO would be nice to connect answers to the steps enum in some helpful
+    * way.
+    */
+  enum Steps(val index: Int, val name: String):
+    case Step1 extends Steps(1, "Your info")
+    case Step2 extends Steps(2, "Select plan")
+    case Step3 extends Steps(3, "Add-ons")
+    case Step4 extends Steps(4, "Summary")
+
+  enum PlanType(val monthlyCost: Int, val iconPath: String):
+    case Arcade extends PlanType(9, "public/images/icon-arcade.svg")
+    case Advanced extends PlanType(12, "public/images/icon-advanced.svg")
+    case Pro extends PlanType(15, "public/images/icon-pro.svg")
+    def name(): String = {
+      this.toString().replaceAll("([a-z])([A-Z])", "$1 $2")
+    }
+
+  enum Addons(val monthlyCost: Int, val description: String):
+    case OnlineService extends Addons(1, "Access to multiplayer games")
+    case LargerStorage extends Addons(2, "Extra 1TB of cloud storage")
+    case CustomProfile extends Addons(2, "Custom theme on your profile")
+
+    /** Change camel case into human readable. Adding single space before each
+      * uppercase
+      */
+    def name(): String = {
+      this.toString().replaceAll("([a-z])([A-Z])", "$1 $2")
+    }
+
+  sealed trait StepAnswers {
+    def fromFormData(rawData: String): StepAnswers
+    def submitted: Boolean
+  }
+  object StepAnswers {
+    final case class Step1(
+        name: String = "",
+        email: String = "",
+        phone: String = "",
+        override val submitted: Boolean = false
+    ) extends StepAnswers {
+      override def fromFormData(rawData: String): Step1 = {
+        println(s"parsing step 1 data $rawData")
+        val fieldValues = rawData
+          .split("&")
+          .filterNot(_.isEmpty())
+          .map { field =>
+            val Array(name, value) = field.split("=")
+            name -> value
+          }
+          .toMap
+
+        val name = fieldValues.getOrElse("name", "")
+        val email = fieldValues.getOrElse("email", "")
+        val phone = fieldValues.getOrElse("phone", "")
+
+        Step1(name, email, phone, submitted = true)
+      }
+    }
+    final case class Step2(
+        planType: PlanType = PlanType.Arcade,
+        isYearly: Boolean = false,
+        override val submitted: Boolean = false
+    ) extends StepAnswers {
+      override def fromFormData(rawData: String): Step2 = {
+        println(s"parsing step 2 data $rawData")
+        val fieldValues = rawData
+          .split("&")
+          .filterNot(_.isEmpty())
+          .map { field =>
+            val Array(name, value) = field.split("=")
+            name -> value
+          }
+          .toMap
+
+        val planType =
+          PlanType.valueOf(fieldValues.getOrElse("plan-type", "Arcade"))
+        val isYearly = fieldValues.get("isPackageYearly").contains("on")
+
+        Step2(planType, isYearly, submitted = true)
+      }
+    }
+    final case class Step3(
+        addons: Set[Addons] = Set.empty,
+        override val submitted: Boolean = false
+    ) extends StepAnswers {
+      def addonsAsJava = addons.asJava
+
+      def containsAddon(addonName: String): Boolean = {
+        addons.contains(Addons.valueOf(addonName))
+      }
+
+      override def fromFormData(rawData: String): Step3 = {
+        println(s"parsing step 3 data $rawData")
+        // for multiple checkboxes data comes in form of
+        // addon-services=OnlineService&addon-services=CustomProfile
+        val fieldValues = rawData
+          .split("&")
+          .filterNot(_.isEmpty())
+          .map { field =>
+            val Array(name, value) = field.split("=")
+            name -> value
+          }
+
+        val addonsStrings = fieldValues
+          .groupMap(_._1)(_._2)
+          .getOrElse("addon-services", Array.empty[String])
+        println(s"in step 3 got strings ${addonsStrings.mkString(", ")}")
+        val addons = addonsStrings.map(Addons.valueOf(_)).toSet
+
+        Step3(addons, submitted = true)
+      }
+    }
+    final case class Step4(
+        override val submitted: Boolean = false
+    ) extends StepAnswers {
+      override def fromFormData(rawData: String): Step4 = {
+        val fieldValues = rawData
+          .split("&")
+          .filterNot(_.isEmpty())
+          .map { field =>
+            println(s"working with field $field")
+            val Array(name, value) = field.split("=")
+            name -> value
+          }
+          .toMap
+
+        val isConfirmed = fieldValues.contains("form-confirmed")
+        Step4(isConfirmed)
+      }
+    }
+  }
+}

15-multi-step-form/src/main/scala/multistepform/Routes.scala

@@ -0,0 +1,222 @@
+package multistepform
+
+import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver
+import org.thymeleaf.TemplateEngine
+import org.thymeleaf.context.Context
+import cask.endpoints.ParamReader
+import java.util.UUID
+import scala.jdk.CollectionConverters._
+import multistepform.Models.Answers
+import scala.annotation.internal.requiresCapability
+import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource
+import com.google.i18n.phonenumbers.PhoneNumberUtil
+
+import java.net.URLDecoder
+import scala.util.Try
+
+case class Routes()(implicit cc: castor.Context, log: cask.Logger)
+    extends cask.Routes {
+  val templateResolver = new ClassLoaderTemplateResolver()
+  templateResolver.setPrefix("templates/");
+  templateResolver.setSuffix(".html")
+  templateResolver.setTemplateMode("HTML5")
+
+  val templateEngine = new TemplateEngine()
+  templateEngine.setTemplateResolver(templateResolver)
+
+  val sessoinCookieName = "sessionId"
+
+  /** This route works with and without 'sessionId' cookie present set's this
+    * cookie if not present, and returns initial 'index.html' where the form is
+    * not yet initialized, and will be requested for the session
+    */
+  @cask.get("/")
+  def getIndex(ctx: cask.Request) = {
+    val sessionCookie = ctx.cookies.get(sessoinCookieName)
+    lazy val newSessionCookies = sessionCookie match {
+      case None =>
+        Seq(
+          cask.Cookie(
+            sessoinCookieName,
+            UUID.randomUUID().toString(),
+            path = "/"
+          )
+        )
+      case Some(_) => Seq.empty // don't set new cookies
+    }
+
+    println(s"getting cookie $sessionCookie will set new? ${newSessionCookies}")
+
+    val context = new Context()
+    val indexPage = templateEngine.process("index", context)
+    cask.Response(
+      indexPage,
+      headers = Seq("Content-Type" -> "text/html;charset=UTF-8"),
+      cookies = newSessionCookies
+    )
+  }
+
+  @cask.get("/force-new-session")
+  def forceNewSession() = {
+    val newSessionCookie =
+      cask.Cookie(sessoinCookieName, UUID.randomUUID().toString(), path = "/")
+    println(s"setting new session ${newSessionCookie.value}")
+    cask.Response(
+      s"New session forced. Force new session",
+      headers = Seq("Content-Type" -> "text/html;charset=UTF-8"),
+      cookies = Seq(newSessionCookie)
+    )
+  }
+
+  val formDataContextVarName = "formData"
+
+  /** This method only works when cookie 'sessionId' is present will get or init
+    * Form State for the session, and return last unsubmitted form step fragment
+    */
+  @cask.get("/get-form")
+  def getForm(sessionId: cask.Cookie) = {
+    val id = sessionId.value
+    val state = Sessions.sessionReplies.getOrElse(id, Answers(id))
+    println(s"starting form for $state")
+    val context = new Context()
+    val formData = Models.FormData(state)
+    context.setVariable(formDataContextVarName, formData)
+    val formFragment = templateEngine.process(
+      state.fragmentName,
+      Set("formFragment").asJava,
+      context
+    )
+    cask.Response(
+      formFragment,
+      headers = Seq("Content-Type" -> "text/html;charset=UTF-8")
+    )
+  }
+
+  @cask.post("/submit-step/:stepNum/:nextStep")
+  def submitStep(
+      sessionId: cask.Cookie,
+      stepNum: Int,
+      nextStep: Int,
+      request: cask.Request
+  ) = {
+    val id = sessionId.value
+    println(s"got $request for $id. it's data is ${request.text()}")
+
+    // note: this is nice at step #1 because not storing anything before first submission
+    // but on followup steps, if data lost - new default object is created
+    // and that is not nice
+    val userAnswers = Sessions.sessionReplies.getOrElse(id, Answers(id))
+
+    val submittedData = URLDecoder.decode(request.text(), "UTF-8")
+
+    val updatedAnswers =
+      userAnswers.updateStep(stepNum, submittedData, nextStep)
+
+    Sessions.sessionReplies.update(id, updatedAnswers)
+
+    val context = new Context()
+    val formData = Models.FormData(updatedAnswers)
+    context.setVariable(formDataContextVarName, formData)
+    val nextFormFragment = templateEngine.process(
+      updatedAnswers.fragmentName,
+      Set("formFragment").asJava,
+      context
+    )
+    println(s"the state now is $updatedAnswers")
+    cask.Response(
+      nextFormFragment,
+      headers = Seq("Content-Type" -> "text/html;charset=UTF-8")
+    )
+  }
+
+  @cask.post("/step1/phonenumber")
+  def validateStep1PhoneNumber(request: cask.Request) = {
+    val submittedData = URLDecoder.decode(request.text(), "UTF-8")
+    println(
+      s"getting data ${request.data} or ${request.text()} or $submittedData"
+    )
+    val fieldValues = submittedData
+      .split("&")
+      .filterNot(_.isEmpty())
+      .map { field =>
+        println(s"looking at field $field")
+        val (name, value) = field.split("=").toList match {
+          case List(name, value) => name -> value
+          case name :: tail      => name -> tail.headOption.getOrElse("")
+          case Nil               => ???
+        }
+        name -> value
+      }
+      .toMap
+
+    val name = fieldValues.getOrElse("name", "")
+    val email = fieldValues.getOrElse("email", "")
+    val phone = fieldValues.getOrElse("phone", "")
+
+    println(s"after parsing name=$name | email=$email | phone=$phone")
+
+    val phoneUtils = PhoneNumberUtil.getInstance()
+    val phoneNum = Try(
+      phoneUtils.parse(phone, CountryCodeSource.UNSPECIFIED.name())
+    ).toOption
+    val isPhoneValid = phoneNum.map(phoneUtils.isValidNumber(_)).getOrElse(false)
+
+    val error = if (isPhoneValid) "" else "Please input valid phone number"
+
+    val context = new Context()
+    context.setVariable("value", phone)
+    context.setVariable("error", error)
+    val inputDiv =
+      templateEngine.process("step1", Set("email-input").asJava, context)
+
+    cask.Response(
+      inputDiv,
+      headers = Seq("Content-Type" -> "text/html;charset=UTF-8")
+    )
+  }
+
+  /** This endpoint re-renders 'plan type inputs' so that togglng monthly\yearly
+    * could redraw their html
+    */
+  @cask.post("/step2/planTypeInputs")
+  def getPlanTypeInputs(sessionId: cask.Cookie, request: cask.Request) = {
+    val id = sessionId.value
+    val submittedData = URLDecoder.decode(request.text(), "UTF-8")
+    println(s"requesting plan type inputs for $id and $request")
+    Sessions.sessionReplies.get(id) match {
+      case None =>
+        cask.Response(
+          "Can't find answers for your session, please reload the page",
+          404
+        )
+      case Some(answers) => {
+        // here changing yearly/monthly part of state based on passed checkbox value
+        // and selected plan
+        // only for purposes of rendering the fragment
+        // not persisting, unless next or previous buttons are pressed
+        val withYearlyParamSetAndSelectedPlan =
+          answers.step2.fromFormData(submittedData)
+        val updatedState =
+          answers.copy(step2 = withYearlyParamSetAndSelectedPlan)
+        val formData = Models.FormData(updatedState)
+        val context = new Context()
+        context.setVariable(formDataContextVarName, formData)
+        val planTypesInputsHtml = templateEngine.process(
+          "step2",
+          Set("planTypesInputs").asJava,
+          context
+        )
+        println(s"updating plan type inputs for $answers")
+        cask.Response(
+          planTypesInputsHtml,
+          headers = Seq("Content-Type" -> "text/html;charset=UTF-8")
+        )
+      }
+    }
+  }
+
+  @cask.staticResources("/public")
+  def publicFiles() = "public"
+
+  initialize()
+}

15-multi-step-form/src/main/scala/multistepform/Sessions.scala

@@ -0,0 +1,11 @@
+package multistepform
+
+import multistepform.Models.Answers
+
+object Sessions {
+  // the simplest form of storing data
+  // i'll be relying on Render.com killing my app after 15 minutes of inactivity for GC
+  // no need to manage concurrency really, because requests for same session are really far apart
+  // and load will average to be 10req/day :shrug:
+  val sessionReplies = scala.collection.mutable.Map.empty[String, Answers]
+}

15-multi-step-form/src/test/scala/example/ExampleSuite.scala

@@ -0,0 +1,8 @@
+package example
+
+class ExampleSuite extends munit.FunSuite:
+
+  test("addition") {
+    assert(1 + 1 == 2)
+  }
+end ExampleSuite

15-multi-step-form/style-guide.md

@@ -0,0 +1,37 @@
+# Front-end Style Guide
+
+## Layout
+
+The designs were created to the following widths:
+
+- Mobile: 375px
+- Desktop: 1440px
+
+## Colors
+
+### Primary
+
+- Marine blue: hsl(213, 96%, 18%)
+- Purplish blue: hsl(243, 100%, 62%)
+- Pastel blue: hsl(228, 100%, 84%)
+- Light blue: hsl(206, 94%, 87%)
+- Strawberry red: hsl(354, 84%, 57%)
+
+### Neutral
+
+- Cool gray: hsl(231, 11%, 63%)
+- Light gray: hsl(229, 24%, 87%)
+- Magnolia: hsl(217, 100%, 97%)
+- Alabaster: hsl(231, 100%, 99%)
+- White: hsl(0, 0%, 100%)
+
+## Typography
+
+### Body Copy
+
+- Font size (paragraph): 16px
+
+### Font
+
+- Family: [Ubuntu](https://fonts.google.com/specimen/Ubuntu)
+- Weights: 400, 500, 700

15-multi-step-form/tailwind.config.js

@@ -0,0 +1,41 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: ["./src/**/*.{scala,html}"],
+  theme: {
+    extend: {
+      colors: {
+        // ### Primary
+        "marine-blue": "hsl(213, 96%, 18%)",
+        "purplish-blue": "hsl(243, 100%, 62%)",
+        "pastel-blue": "hsl(228, 100%, 84%)",
+        "light-blue": "hsl(206, 94%, 87%)",
+        "strawberry-red": "hsl(354, 84%, 57%)",
+
+        // ### neutral
+        "cool-gray": "hsl(231, 11%, 63%)",
+        "light-gray": "hsl(229, 24%, 87%)",
+        magnolia: "hsl(217, 100%, 97%)",
+        alabaster: "hsl(231, 100%, 99%)",
+      },
+      backgroundImage: {
+        'sidebar-mobile': 'url("images/bg-sidebar-mobile.svg")',
+        'sidebar-desktop': 'url("images/bg-sidebar-desktop.svg")',
+      },
+      fontFamily: {
+        'sans': ['Ubuntu', 'sans-serif'], // This will set Roboto as the default sans font
+      },
+      fontWeight: {
+        'normal': 400,
+        'semibold': 600,
+        'bold': 700,
+      },
+      width: {
+        'desktop-form': '60rem',
+      },
+      height: {
+        'desktop-form': '38rem',
+      },
+    },
+  },
+  plugins: [],
+};

16-countries-page-from-api/.gitignore

@@ -0,0 +1,16 @@
+.bsp/
+.scala-build/
+.metals/
+.direnv
+*/dist/
+/11-single-price-grid-component/.bloop/
+
+**/.bloop
+**/project/project/
+**/project/metals.sbt
+**/project/.bloop
+**/project/target/
+**/target/
+
+*/result
+result

16-countries-page-from-api/.scalafmt.conf

@@ -0,0 +1,2 @@
+version = "3.7.10"
+runner.dialect = scala3

16-countries-page-from-api/README.org

@@ -0,0 +1,136 @@
+* Frontend Mentor - REST Countries API with color theme switcher solution
+:PROPERTIES:
+:CUSTOM_ID: frontend-mentor---rest-countries-api-with-color-theme-switcher-solution
+:END:
+This is a solution to the
+[[https://www.frontendmentor.io/challenges/rest-countries-api-with-color-theme-switcher-5cacc469fec04111f7b848ca][REST
+Countries API with color theme switcher challenge on Frontend Mentor]].
+Frontend Mentor challenges help you improve your coding skills by
+building realistic projects.
+
+** Overview
+:PROPERTIES:
+:CUSTOM_ID: overview
+:END:
+*** The challenge
+:PROPERTIES:
+:CUSTOM_ID: the-challenge
+:END:
+Users should be able to:
+
+- See all countries from the API on the homepage
+- Search for a country using an =input= field
+- Filter countries by region
+- Click on a country to see more detailed information on a separate page
+- Click through to the border countries on the detail page
+- Toggle the color scheme between light and dark mode /(optional)/
+
+*** Screenshot
+:PROPERTIES:
+:CUSTOM_ID: screenshot
+:END:
+[[mobile-main.png]]
+[[mobile-single.png]]
+[[desktop-main.png]]
+[[desktop-single.png]]
+
+
+*** Links
+:PROPERTIES:
+:CUSTOM_ID: links
+:END:
+- Solution URL: https://github.com/efim/Learning-HTMX/tree/master/16-countries-page-from-api
+- Live Site URL: https://efim-frontentmentor-countries-page.onrender.com/
+
+** My process
+:PROPERTIES:
+:CUSTOM_ID: my-process
+:END:
+*** Built with
+:PROPERTIES:
+:CUSTOM_ID: built-with
+:END:
+- Scala Server Side Rendering
+- Htmx
+- TailwindCSS
+- Flexbox
+- CSS Grid
+- Mobile-first workflow
+
+
+*** What I learned
+:PROPERTIES:
+:CUSTOM_ID: what-i-learned
+:END:
+**** polling download for 'infinite scroll'
+https://htmx.org/examples/infinite-scroll/
+
+I've done almost same thing as example,
+but i'm appending additional empty div, that inserts responses instead of itself
+
+this way i have one template fragment with repeater,
+and don't have to add hx attributes to the last one,
+
+i just have separate fragment that i append to response which will trigger new
+load on enter view.
+**** having html 5 native autocomplete with <datalist> tag
+just server side rendering it with all country names is yay
+**** inserting thymeleaf templates by css selector
+https://www.thymeleaf.org/doc/tutorials/3.1/usingthymeleaf.html#appendix-c-markup-selector-syntax
+
+this way i can insert <script> tag from index page, without declaring it as a fragment,
+because i'll want is static anyway.
+
+and can share 'dark mode' js code between pages
+**** building docker image
+First off: using nix docker tools, and sbt assembly to create 'uber jar'
+now 'nix build .#countries-page-image' builds an image and symlinks it to ./result
+
+$ docker load < result
+loads the image
+
+and it can be started
+$ docker image list
+$ docker run -d -p 9090:8080 <image-id>
+**** deploying to render.com
+need to auth the docker cli, then tag an image with my repository name
+$ docker login
+$ docker tag 141 efim1234/rock-paper-scissors:latest
+$ podman push localhost/efim1234/countries-page:latest     docker.io/efim1234/countries-page:latest
+
+and now render.com, when creating "new service"
+can find "efim1234/countries-page:latest" as public image and use it
+**** using browser history
+with either server side
+HX-Push -> "some-url"
+or
+hx-push-url="true" in the html side
+
+so that url is put into address bar,
+and browser save the body into history
+
+and now my website has forward and backward navigation
+
+only bug - the 'filter by region' for some reason doesn't maintain the selected value
+
+*** Continued development
+:PROPERTIES:
+:CUSTOM_ID: continued-development
+:END:
+In future project i'll probably want to lean and use go.
+For smaller binaries of the server, using PocketBase as embedded backend functions,
+and maybe having a better chances of just doing some real world small projects.
+
+*** Useful resources
+:PROPERTIES:
+:CUSTOM_ID: useful-resources
+:END:
+- htmx documentation and examples
+  https://htmx.org/docs/#introduction
+- thymeleaf documentation
+  https://www.thymeleaf.org/doc/tutorials/3.1/usingthymeleaf.html#introducing-thymeleaf
+- TailwindCSS documentation
+  https://tailwindcss.com/docs/installation
+- heroicons: MIT licensed svg icons
+  https://github.com/tailwindlabs/heroicons
+- render.com for providing free hosting for services from docker images

16-countries-page-from-api/build.sbt

@@ -0,0 +1,17 @@
+name := "countries-page"
+
+val toolkitV = "0.1.7"
+val toolkit = "org.scala-lang" %% "toolkit" % toolkitV
+val toolkitTest = "org.scala-lang" %% "toolkit-test" % toolkitV
+
+val cask = "com.lihaoyi" %% "cask" % "0.9.1"
+val mainargs = "com.lihaoyi" %% "mainargs" % "0.5.4"
+val requests = "com.lihaoyi" %% "requests" % "0.8.0"
+
+ThisBuild / scalaVersion := "3.2.2"
+libraryDependencies ++= Seq(cask, mainargs, requests)
+libraryDependencies += toolkit
+libraryDependencies += (toolkitTest % Test)
+
+// https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf
+libraryDependencies += "org.thymeleaf" % "thymeleaf" % "3.1.2.RELEASE"

16-countries-page-from-api/default.nix

@@ -0,0 +1,37 @@
+{ pkgs, lib, sbt-derivation }:
+let pname = "countries-page";
+in rec {
+  package = sbt-derivation.lib.mkSbtDerivation {
+    inherit pkgs pname;
+    # ...and the rest of the arguments
+    version = "0.0.1";
+    src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+    nativeBuildInputs = [ pkgs.nodePackages.tailwindcss ];
+    buildPhase = ''
+      tailwindcss -i ./src/input.css -o ./src/main/resources/public/output.css
+      sbt assembly
+    '';
+    installPhase = ''
+      mkdir -p $out/bin
+      cp target/scala-*/${pname}-assembly-*.jar $out/bin/${pname}.jar
+    '';
+
+    depsSha256 = "sha256-PZYt1xvT8BKkFedA8nQvjvuE6JtmxNh0aSManAe4DpY=";
+  };
+  image = pkgs.dockerTools.buildLayeredImage {
+    name = pname;
+    tag = "latest";
+    created = "now";
+    config = {
+      Cmd = [
+        "${pkgs.jdk}/bin/java"
+        "-jar"
+        "${package}/bin/${pname}.jar"
+        "--host"
+        "0.0.0.0"
+      ];
+      ExposedPorts = { "8080/tcp" = { }; };
+    };
+  };
+
+}