extends SelectionTool


func apply_selection(position : Vector2) -> void:
	var project : Project = Global.current_project
	if !_add and !_subtract and !_intersect:
		Global.canvas.selection.clear_selection()

	var selection_bitmap_copy : BitMap = project.selection_bitmap.duplicate()
	if _intersect:
		var full_rect = Rect2(Vector2.ZERO, selection_bitmap_copy.get_size())
		selection_bitmap_copy.set_bit_rect(full_rect, false)

	var cel_image := Image.new()
	cel_image.copy_from(_get_draw_image())
	cel_image.lock()
	flood_fill(position, cel_image, selection_bitmap_copy)

	# Handle mirroring
	if tool_slot.horizontal_mirror:
		var mirror_x := position
		mirror_x.x = Global.current_project.x_symmetry_point - position.x
		flood_fill(mirror_x, cel_image, selection_bitmap_copy)
		if tool_slot.vertical_mirror:
			var mirror_xy := mirror_x
			mirror_xy.y = Global.current_project.y_symmetry_point - position.y
			flood_fill(mirror_xy, cel_image, selection_bitmap_copy)
	if tool_slot.vertical_mirror:
		var mirror_y := position
		mirror_y.y = Global.current_project.y_symmetry_point - position.y
		flood_fill(mirror_y, cel_image, selection_bitmap_copy)
	cel_image.unlock()
	project.selection_bitmap = selection_bitmap_copy
	Global.canvas.selection.big_bounding_rectangle = project.get_selection_rectangle(project.selection_bitmap)
	Global.canvas.selection.commit_undo("Rectangle Select", undo_data)


func flood_fill(position : Vector2, image : Image, bitmap : BitMap) -> void:
	var project : Project = Global.current_project
	if position.x < 0 or position.y < 0:
		return
	if position.x > project.size.x - 1 or position.y > project.size.y - 1:
		return
	var color := image.get_pixelv(position)

	# Flood fill logic
	var processed := BitMap.new()
	processed.create(image.get_size())
	var q = [position]
	for n in q:
		if processed.get_bit(n):
			continue
		var west : Vector2 = n
		var east : Vector2 = n
		while west.x >= 0 && image.get_pixelv(west).is_equal_approx(color):
			west += Vector2.LEFT
		while east.x < project.size.x && image.get_pixelv(east).is_equal_approx(color):
			east += Vector2.RIGHT
		for px in range(west.x + 1, east.x):
			var p := Vector2(px, n.y)
			if _intersect:
				bitmap.set_bit(p, project.selection_bitmap.get_bit(p))
			else:
				bitmap.set_bit(p, !_subtract)
			processed.set_bit(p, true)
			var north := p + Vector2.UP
			var south := p + Vector2.DOWN
			if north.y >= 0 && image.get_pixelv(north).is_equal_approx(color):
				q.append(north)
			if south.y < project.size.y && image.get_pixelv(south).is_equal_approx(color):
				q.append(south)