refactor: data structs for template + method

enclosing rooms.Room into roomTableData, with methods to be used in
tempalte to get other template related derived data structures

routes/room_page_templates_preview.go

@@ -33,32 +33,29 @@ var brickColors = map[rooms.HandGesture]template.CSS{
 	rooms.ChangeTopic: "--change-topic-color",
 }
 
+// data to be passed to "roomPeople" template
 type roomTableData struct {
-	Persons []personData
-	Total   int
-	Tangens float64
+	*rooms.Room
+	currentPerson rooms.PersonId
 }
 
-func personsFromRoom(room rooms.Room) roomTableData {
-	// TODO start from the 'logged in person'
-	total := len(room.Paricipants)
-	persons := make([]personData, 0, total)
-	tangens := math.Tan(math.Pi / float64(total)) // Math.tan(Math.PI/m);
-	// tangens = math.Round(tangens*100) / 100
+func (room *roomTableData)Persons() []personData {
+	persons := make([]personData, 0, room.Total())
 	for i, pId := range room.Paricipants {
 		personData := personDataFromRoom(room, pId)
 		personData.Index = i
-		// personData.Tan = math.Round(tangens*100)/100
 		persons = append(persons, personData)
 	}
-	return roomTableData{
-		Persons: persons,
-		Total:   total,
-		Tangens: tangens,
-	}
+	return persons
+}
+func (r *roomTableData)Total() int {
+	return len(r.Paricipants)
+}
+func (r *roomTableData)Tangens() float64 {
+	return math.Tan(math.Pi / float64(r.Total())) // Math.tan(Math.PI/m);
 }
 
-func personDataFromRoom(room rooms.Room, pId rooms.PersonId) personData {
+func personDataFromRoom(room *roomTableData, pId rooms.PersonId) personData {
 	person, exists := room.AllKnownPeople[pId]
 	if !exists || !slices.Contains(room.Paricipants, pId) {
 		return personData{}
@@ -85,7 +82,7 @@ func personDataFromRoom(room rooms.Room, pId rooms.PersonId) personData {
 	}
 }
 
-func bricksForPerson(pData personData) []brickState {
+func (pData personData)BricksForPerson() []brickState {
 	var result = make([]brickState, 5)
 	for gesture := rooms.ChangeTopic; gesture <= rooms.Meta; gesture++ {
 		// for index := rooms.Meta; index >= rooms.ChangeTopic; index-- {
@@ -168,7 +165,7 @@ func roomTemplatesPreview(
 			Bricks       []SingleBrickData
 			ABrick       brickState
 			TestPerson   personData
-			ARoom        rooms.Room
+			ARoom        *roomTableData
 		}{
 			DefaultColor: "--expand-color",
 			ABrick: brickState{
@@ -198,7 +195,10 @@ func roomTemplatesPreview(
 				},
 			},
 			TestPerson: testPersonData,
-			ARoom:      aRoom,
+			ARoom:      &roomTableData{
+				Room: &aRoom,
+				currentPerson: aRoom.Paricipants[0],
+			},
 		}
 
 		pageData := pageData{
@@ -207,10 +207,7 @@ func roomTemplatesPreview(
 		}
 
 		baseFile := "templates/base.gohtml"
-		tmpl := template.Must(template.New("").Funcs(template.FuncMap{
-			"bricksForPerson": bricksForPerson,
-			"personsFromRoom": personsFromRoom,
-		}).ParseFS(templateFs, baseFile,
+		tmpl := template.Must(template.New("").ParseFS(templateFs, baseFile,
 			"templates/tableTemplates.gohtml",
 			"templates/tableTemplatesPreview.gohtml",
 		))