extends Node2D

@onready var GroundLayer: TileMapLayer = $Ground
@onready var ObstacleLayer: TileMapLayer = $Obstacles
# Maybe a SubClass that is a Singleton, so we can create one grid
# and then change it per Map
var astarGrid: AStarGrid2D

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	#astarGrid = generateSimpleGrid()
	astarGrid = generateObstacleGrid()
	%GridDisplay.grid = astarGrid

func generateSimpleGrid() -> AStarGrid2D:
	var grid = newGrid()
	
	for id in GroundLayer.get_used_cells():
		var data: TileData = GroundLayer.get_cell_tile_data(id)
		if data and data.get_custom_data('obstacle'):
			grid.set_point_solid(id)
	
	return grid

func generateObstacleGrid() -> AStarGrid2D:
	var grid = newGrid()
	
	var layers = ObstacleLayer.get_children()
	for layer in layers:
		for id in layer.get_used_cells():
			var data: TileData = layer.get_cell_tile_data(id)
			if data and data.get_custom_data('obstacle'):
				grid.set_point_solid(id)
	
	return grid

func newGrid() -> AStarGrid2D:
	var _astarGrid = AStarGrid2D.new()
	_astarGrid.default_compute_heuristic = AStarGrid2D.HEURISTIC_MANHATTAN
	_astarGrid.default_estimate_heuristic = AStarGrid2D.HEURISTIC_MANHATTAN
	_astarGrid.diagonal_mode = AStarGrid2D.DIAGONAL_MODE_ONLY_IF_NO_OBSTACLES
	_astarGrid.cell_size = Vector2(GroundLayer.tile_set.tile_size)
	_astarGrid.region = GroundLayer.get_used_rect()
	_astarGrid.update()
	
	return _astarGrid

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass

func getGrid():
	return astarGrid