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.xform(initial_touches[0])
#	var offset = current_touches[0] - transformed_initial_touch
#
#	#print(jump)
#	jump.origin = offset
#	#jump = jump.translated(offset)
#	#print(jump)
#
#	var transform = jump * initial_transform
#	#print(transform)
	
	var init_set = [
		initial_touches[0],
		initial_touches[1],
		(initial_touches[1] - initial_touches[0]).tangent() + initial_touches[1],
		(initial_touches[1] - initial_touches[0]).tangent() + initial_touches[0],
	]

	var curr_set = [
		current_touches[0],
		current_touches[1],
		(current_touches[1] - current_touches[0]).tangent() + current_touches[1],
		(current_touches[1] - current_touches[0]).tangent() + current_touches[0],
	]

	var basis = SummerDayMathHelper.basis_from_to_points(
		init_set[0], init_set[1], init_set[2], init_set[3], 
		curr_set[0], curr_set[1], curr_set[2], curr_set[3] 
	)

	#print(basis)

	var transform = Transform2D(
		Vector2(basis.x.x, basis.x.y),
		Vector2(basis.y.x, basis.y.y),
		Vector2(basis.z.x, basis.z.y)
		) * initial_transform
	tool_context.canvas_state.canvas_transform = transform