tool
extends Control
class_name SummerDayCanvas


signal fill_transform_changed(fill_transform)
signal canvas_transform_changed(canvas_transform)
signal view_transform_changed(view_transform)


var scene: SummerDayScene

var fill_transform := Transform2D.IDENTITY
var canvas_transform := Transform2D.IDENTITY
var view_transform := Transform2D.IDENTITY # fill_transform * canvas_transform


func _ready():
	connect("view_transform_changed",
	$BackgroundLayer/EmptyCanvasLayer, "_on_view_transform_changed")


func _gui_input(event):
	if event is InputEventMagnifyGesture:
		print(event.factor)
	if event is InputEventMouseButton:
		print(event.pressed)


func _on_SummerDay_scene_changed(new_scene):
	scene = new_scene
	_update_fill_transform()
	scene.connect("aspect_ratio_changed",
		self, "_on_scene_aspect_ratio_changed")
	$Label.text = str(scene) + "\n" + str(scene.aspect_ratio)


func _on_Canvas_resized():
	_update_fill_transform()


func _on_scene_aspect_ratio_changed(new_aspect_ratio):
	$BackgroundLayer/EmptyCanvasLayer._update_size(new_aspect_ratio)
	_update_fill_transform()


func _update_fill_transform():
	if scene == null:
		fill_transform = Transform2D.IDENTITY
	else:
		var aspect_ratio = scene.aspect_ratio.x / scene.aspect_ratio.y
		
		var size_ratio = rect_size.x / rect_size.y
		
		var scale
		var translation = Vector2.ZERO
		if aspect_ratio <= size_ratio:
			scale = rect_size.y
			print(rect_size.y)
			translation.x = rect_size.x * 0.5 - aspect_ratio * scale * 0.5
			print(rect_size.x * 0.5)
			print(aspect_ratio * scale * 0.5)
			print(translation)
		else:
			scale = rect_size.x / aspect_ratio
			translation.y = rect_size.y * 0.5 - scale * 0.5
		
		fill_transform = Transform2D.IDENTITY.scaled(Vector2(scale, scale))
		fill_transform = fill_transform.translated(translation)
		fill_transform = Transform2D(
			Vector2(scale, 0.0),
			Vector2(0.0, scale),
			translation
		)
	print(fill_transform)
	emit_signal("fill_transform_changed", fill_transform)


func _update_view_transformation(transform):
	view_transform = fill_transform * canvas_transform
	emit_signal("view_transform_changed", view_transform)