extends Sprite2D

var pos: Vector2i = Vector2i(0,0)
var dir: TileSet.CellNeighbor = TileSet.CELL_NEIGHBOR_RIGHT_SIDE
@onready var tiles: TileMapLayer = get_node("../TileMapLayer")

var next_dir: Dictionary = {
	0: TileSet.CELL_NEIGHBOR_RIGHT_SIDE,
	1: TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE,
	2: TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE,
	3: TileSet.CELL_NEIGHBOR_LEFT_SIDE,
	4: TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE,
	5: TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE,
}
	
var cur_int: Dictionary = {
	TileSet.CELL_NEIGHBOR_RIGHT_SIDE: 0,
	TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE: 1,
	TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE: 2,
	TileSet.CELL_NEIGHBOR_LEFT_SIDE: 3,
	TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE: 4,
	TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE: 5,
}

func _ready() -> void:
	self.set_z_index(1)
	self.set_frame(cur_int[dir])
	tiles.set_tile(pos, (tiles.get_tile_colour(pos))) # TODO: should probably use another dictionary
	move()

func update() -> void:
	var tile: int = tiles.get_tile_colour(pos)
	var newFrame: int = cur_int[dir]
	
	# TODO: turn into dict{tileCol, (nextDir, paintCol)} customizable
	match tile:
		0:
			newFrame = (newFrame + 5) % tiles.numTiles
		1:
			newFrame = (newFrame + 4) % tiles.numTiles
		2:
			newFrame = (newFrame + 0) % tiles.numTiles
		3:
			newFrame = (newFrame + 0) % tiles.numTiles
		4:
			newFrame = (newFrame + 5) % tiles.numTiles
		5:
			newFrame = (newFrame + 4) % tiles.numTiles 
		_:
			pass
	dir = next_dir[newFrame]
		
	move()
	pos = tiles.get_neighbor_cell(pos, dir)
	tile = tiles.get_tile_colour(pos)
	tiles.set_tile(pos, (tile + 1) % tiles.numTiles) # TODO: should probably use another dictionary
	self.set_frame(newFrame)
	
func move() -> void:
	var delta: Vector2
	match dir:
		TileSet.CELL_NEIGHBOR_RIGHT_SIDE:
			delta = Vector2(tiles.texSize.x, 0)
		TileSet.CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE:
			delta = Vector2(tiles.texSize.x/2, tiles.texSize.y/4*3)
		TileSet.CELL_NEIGHBOR_BOTTOM_LEFT_SIDE:
			delta = Vector2(-tiles.texSize.x/2, tiles.texSize.y/4*3)
		TileSet.CELL_NEIGHBOR_LEFT_SIDE:
			delta = Vector2(-tiles.texSize.x, 0)
		TileSet.CELL_NEIGHBOR_TOP_LEFT_SIDE:
			delta = Vector2(-tiles.texSize.x/2, -tiles.texSize.y/4*3)
		TileSet.CELL_NEIGHBOR_TOP_RIGHT_SIDE:
			delta = Vector2(tiles.texSize.x/2, -tiles.texSize.y/4*3)
		_:
			delta = Vector2(0,0)
	self.translate(delta)