extends CharacterBody2D

var _grid_pos: Vector2i = Vector2i.ZERO
var _grid_tween: Tween = null

var _cached_dir: Vector2i = Vector2i.ZERO #used for reversing the current input

func _physics_process(delta: float) -> void:
	#WARNING: this has the potential for getting stuck
	if _grid_pos * 32 == Vector2i(position):
		_check_grid_move(delta)

func _check_grid_move(delta: float) -> void:
	if Input.is_action_pressed("input_north"):
		_set_grid_move(Vector2i.UP)
	elif Input.is_action_pressed("input_south"):
		_set_grid_move(Vector2i.DOWN)
	elif Input.is_action_pressed("input_west"):
		_set_grid_move(Vector2i.LEFT)
	elif Input.is_action_pressed("input_east"):
		_set_grid_move(Vector2i.RIGHT)

func _set_grid_move(grid_dir: Vector2i):
	_cached_dir = grid_dir
	_grid_pos += grid_dir
	_grid_tween = create_tween()
	_grid_tween.set_ease(Tween.EASE_OUT_IN)
	_grid_tween.set_trans(Tween.TRANS_QUAD)
	_grid_tween.tween_property(self, "position", Vector2(_grid_pos * 32), 0.3)

func repel_collision(_other: Node2D) -> void:
	#NOTE: character's collider has a 1 pixel margin
	if _cached_dir != Vector2i.ZERO:
		_grid_tween.kill()
		_set_grid_move(-_cached_dir) #go backwards
		_cached_dir = Vector2i.ZERO #only do this once each collision