class_name BlockTileLayer extends TileMapLayer


signal block_hit(tile_pos: Vector2i, hits_left: int)
signal block_destroyed(tile_pos: Vector2i)

## Atlas in which the destructable blocks are stored.
@export var max_hits: int = 4

var hit_counts: Dictionary[Vector2i, int] = {}


## Returns true if block is destroyed.
func hit_tile(coords: Vector2i) -> bool:
	var source_id: int = get_cell_source_id(coords)
	
	var current_atlas: Vector2i = get_cell_atlas_coords(coords)
	var row: int = current_atlas.y
	
	var hits: int = hit_counts.get(coords, 0) + 1
	
	if hits >= max_hits:
		# destroy
		set_cell(coords, -1)
		hit_counts.erase(coords)
		block_destroyed.emit(coords)
		return true
	else:
		# damage
		var new_atlas: Vector2i = Vector2i(hits, row)  # column=hits, row=same color
		set_cell(coords, source_id, new_atlas)
		hit_counts[coords] = hits
		block_hit.emit(coords, max_hits - hits)
		return false