tool
extends PanelContainer
class_name SummerDayCanvas

var scene: SummerDayScene
var canvas_state := SummerDayCanvasState.new()
var tool_pool := SummerDayCanvasToolPool.new()

var tool_context: SummerDayToolContext # Provided by plugin root.


func _ready():
	tool_context.canvas_state = canvas_state
	canvas_state.connect("view_transform_changed",
	$Render/BackgroundLayer/EmptyCanvasLayer, "_on_view_transform_changed")
	canvas_state.connect("clip_space_view_transform_changed",
	self, "_on_clip_space_view_transform_changed")


func _gui_input(event):
	tool_pool.run_most_prior(event, tool_context)


# _gui_input() cannot receive screen touch released event so we do this here.
func _input(event):
	if event is InputEventScreenTouch and !event.is_pressed():
		tool_pool.run_most_prior(event, tool_context)


func _on_SummerDay_scene_changed(new_scene):
	scene = new_scene
	canvas_state.update_fill_transform(scene)
	scene.connect("aspect_ratio_changed",
		self, "_on_scene_aspect_ratio_changed")
	$Render/Label.text = str(scene) + "\n" + str(scene.aspect_ratio)
	$Render/BackgroundLayer/EmptyCanvasLayer.update_size(scene)
	canvas_state.update_fill_transform(scene)


func _on_Canvas_resized():
	canvas_state.rect_size = rect_size
	canvas_state.update_canvas_to_clip_space()
	canvas_state.update_fill_transform(scene)


func _on_scene_aspect_ratio_changed(new_aspect_ratio):
	$Render/BackgroundLayer/EmptyCanvasLayer.update_size(scene)
	canvas_state.update_fill_transform(scene)


func _on_clip_space_view_transform_changed(new_transform):
	var listeners = get_tree().get_nodes_in_group("ListenForTransformUpdate")
	for i in listeners:
		var basis = Basis(
			Vector3(new_transform.x.x, new_transform.x.y, 0.0),
			Vector3(new_transform.y.x, new_transform.y.y, 0.0),
			Vector3(new_transform.origin.x, new_transform.origin.y, 1.0)
		)
		i.get_material().set_shader_param("canvas_transform", basis)
		#print(i.get_material().get_shader_param("canvas_transform"))