;(load (sb-ext:posix-getenv "ASDF"))
(asdf:load-system 'cl-cffi-gtk)
(asdf:load-system 'cl-gobject-introspection)

(defpackage :capturing-frames
				(:use :cl))

(in-package :capturing-frames)
(gir:require-namespace "GLib")
(defvar *gstreamer* (gir:require-namespace "Gst"))
(defvar *gstapp* (gir:require-namespace "GstApp"))

(defun cast-with-videobox (&optional stream-num)
  (gir:invoke (*gstreamer* 'init) '())
  (let* ((pipeline (gir:invoke (*gstreamer* "Pipeline" 'new) "video-pipeline"))
         (source (gir:invoke (*gstreamer* "ElementFactory" 'make) (if stream-num
																							"pipewiresrc"
																							"videotestsrc") "source"))
         (convert (gir:invoke (*gstreamer* "ElementFactory" 'make) "videoconvert" "convert"))
			(tee (gir:invoke (*gstreamer* "ElementFactory" 'make) "tee" "tee"))
			(queue1 (gir:invoke (*gstreamer* "ElementFactory" 'make) "queue" "queue1"))
         (queue2 (gir:invoke (*gstreamer* "ElementFactory" 'make) "queue" "queue2"))
         (sink (gir:invoke (*gstreamer* "ElementFactory" 'make) "autovideosink" "sink"))
			(appsink (gir:invoke (*gstreamer* "ElementFactory" 'make) "appsink" "appsink"))
			)
	 (when stream-num
		;; Set pipewiresrc properties, such as the path
		(setf (gir:property source 'path) (format nil "~A" stream-num)))

	 ;; Add and link elements in the pipeline
    (gir:invoke (pipeline 'add) source)
    (gir:invoke (pipeline 'add) convert)
	 (gir:invoke (pipeline 'add) tee)
	 (gir:invoke (pipeline 'add) queue1)
	 (gir:invoke (pipeline 'add) queue2)
	 (gir:invoke (pipeline 'add) sink)
	 (gir:invoke (pipeline 'add) appsink)
    
    (gir:invoke (source 'link) convert)
	 (gir:invoke (convert 'link) tee)
	 (gir:invoke (tee 'link) queue1)
	 (gir:invoke (tee 'link) queue2)
    (gir:invoke (queue1 'link) sink)
	 (gir:invoke (queue2 'link) appsink)

    ;; Configure appsink
	 (setf (gir:property appsink "emit-signals") t
			 (gir:property appsink "max-buffers") 1
			 (gir:property appsink "drop") t)
    	 
	 (gir:invoke (pipeline 'set-state) (gir:nget *gstreamer* "State" :playing))
	 	 
    ;; Example: Move the video 10 pixels down and 20 pixels to the right
	 (values pipeline appsink)))

(defun process-frame (sample)
  (format t ">>> got to process sample with ~A~%" sample)
  (let* ((buffer (gir:invoke (sample 'get-buffer)))
         (info (gir:invoke (sample 'get-info)))
			(caps (gir:invoke (sample 'get-caps)))
			(caps-struct (gir:invoke (caps 'get-structure) 0))
			(width (gir:invoke ((gir:invoke (caps-struct 'get-value) "width") 'get-int)))
			(height (gir:invoke ((gir:invoke (caps-struct 'get-value) "height") 'get-int))))
	 (multiple-value-bind (found map-info) (gir:invoke (buffer 'map) (gir:nget *gstreamer* "MapFlags" :read))
		(format t ">>>> the buffer has offset ~A~%" (gir:field buffer 'offset))
		(format t ">>>> what's in struct? ~A~%" (gir:invoke (caps-struct 'to-string)))
		(format t ">>>> the fields are width ~A, height ~A~%" width height)
		(format t ">>>> and map result are ~A and ~A~%" found map-info)
		(when found
		  (let ((data (gir:field map-info 'data))
				  (size (gir:field map-info 'size)))
			 (format t ">>>> and struct info? ~A~%" map-info)
;			 (format t ">>>> and data has size ~A and buf ~A~%" size (or data "empty data"))
			 )))
	 ;; Unmap the memory when done
    ;; (gir:invoke (info 'unmap) map-info)
	 ))

(defun start-processing (appsink)
  (gir:connect appsink "new-sample"
               (lambda (appsink)
					  (format t ">> got printed object ~A~%" appsink)
					  (format t ">> got printed class ~A~%" (gir:gir-class-of appsink))
					  (format t ">> trying to get method on sink ~A~%" (gir:nget appsink 'pull-sample))
					  (let ((sample (gir:invoke (appsink 'pull-sample))))
                   (when sample
                     (process-frame sample)))

					  
                 (gir:nget *gstreamer* "FlowReturn" :ok))))

(defun try-run ()
  (multiple-value-bind (pipeline appsink) (cast-with-videobox)
	 (format t "got appsink ~A" appsink)
	 (start-processing appsink)
	 (loop
		(sleep 1))))

;(try-run)