extends TileMap

signal kace_broken
signal has_moved

enum Tile {
	BRICK = 0,
}

enum State {
	DONE,
	MOVING,
}

var current_state = State.DONE

var current_row = 1

var living_cells = {}


func generate_and_move():
	generate_row()
	current_state = State.MOVING
	move()
	current_state = State.DONE


func generate_row():
	for x in range(10):
		generate_cell(x, -current_row)


func generate_cell(x, y):
	if randi() % 2 : # 50% of generation
		build_brick(x, y)


func build_brick(x, y):
	set_cell(x, y, Tile.BRICK)
	living_cells[Vector2(x, y)] = current_row


func damage_cell(tile_pos : Vector2):
	var cell_id = get_cellv(tile_pos)
	if cell_id != TileMap.INVALID_CELL and cell_id == Tile.BRICK:
		living_cells[tile_pos] -= 1
		if living_cells[tile_pos] <= 0:
			break_cell(tile_pos)


func break_cell(tile_pos):
	living_cells.erase(tile_pos)
	set_cellv(tile_pos, -1)
	emit_signal("kace_broken")


func move():
	current_row += 1
	position.y += cell_size.y


func _ready():
	randomize()
	generate_and_move()


func _on_Ball_kace_contact(contact_pos:Vector2):
	var local_position = to_local(contact_pos)
	var tile_pos = world_to_map(local_position)
	damage_cell(tile_pos)


func _on_Launcher_is_full():
	generate_and_move()
	emit_signal("has_moved")