extends SummerDayTool
class_name SummerDayFreeTransformCanvasTool


var touch_dict = {}
var initial_touches
var current_touches
var initial_transform: Transform2D


func _init():
	priority = 1


func _check_for_use(event: InputEvent, tool_context: SummerDayToolContext):
	if event is InputEventScreenTouch:
		if event.pressed:
			touch_dict[event.index] = event.position
		else:
			touch_dict.erase(event.index)
		if touch_dict.size() == 2:
			initial_transform = tool_context.canvas_state.canvas_transform
			
			var keys = touch_dict.keys()
			initial_touches = [touch_dict[keys[0]], touch_dict[keys[1]]]
		print(touch_dict)
	
	if event is InputEventScreenDrag:
		touch_dict[event.index] = event.position
		if touch_dict.size() == 2:
			var keys = touch_dict.keys()
			current_touches = [touch_dict[keys[0]], touch_dict[keys[1]]]
			return true
	
	return false

func _run(event: InputEvent, tool_context: SummerDayToolContext):
	var jump := Transform2D.IDENTITY
	
	# Calculate scale.
	var initial_distance = initial_touches[0].distance_to(initial_touches[1])
	var current_distance = current_touches[0].distance_to(current_touches[1])
	var scale = current_distance / initial_distance
	
	# Calculate rotation.
	var initial_angle = initial_touches[0].angle_to_point(initial_touches[1])
	var current_angle = current_touches[0].angle_to_point(current_touches[1])
	var rotation = current_angle - initial_angle
	
	jump = jump.scaled(Vector2(scale, scale)).rotated(rotation)
	
	# Calculate origin.
	var transformed_initial_touch = jump.basis_xform(initial_touches[0])
	var offset = current_touches[0] - transformed_initial_touch
	
	print(jump)
	jump = Transform2D(Vector2.RIGHT, Vector2.DOWN, offset) * jump
	print(jump)
	
	var transform = jump * initial_transform
	tool_context.canvas_state.canvas_transform = transform