extends Sprite

var last_position = Vector2()
var target_position = Vector2()
var direction = Vector2()

export(float) var speed = 5

# References const TILE_SIZE from the Game Node2D
onready var TILE_SIZE = get_parent().get_parent().TILE_SIZE

onready var ray = $RayCast2D
onready var tween = $Tween

func _ready():
	speed = 1 / speed

	position = position.snapped(Vector2(TILE_SIZE / 2, TILE_SIZE / 2))

	target_position = position

func _process(delta):
	_get_direction()

	# COLLISION == MOVE PLAYER BACK TO LAST POSITION
	if(ray.is_colliding()):
		target_position = last_position

		_move_player()
	# NO COLLISION AND PLAYER IS NOT MOVING == MOVE PLAYER TO WHERE THEY WANT
	elif(target_position == position):
		target_position = position + direction * TILE_SIZE
		last_position = position

		_move_player()

func _move_player():
	tween.interpolate_property(self, "position", position, target_position, speed, Tween.TRANS_LINEAR, Tween.EASE_IN)
	tween.start()

func _get_direction():
	var right = Input.is_action_pressed("ui_right")
	var left = Input.is_action_pressed("ui_left")
	var up = Input.is_action_pressed("ui_up")
	var down = Input.is_action_pressed("ui_down")

	direction.x = int(right) - int(left)
	direction.y = int(down) - int(up)

	# PLAYER TRIES TO MOVE DIAGONALLY
	if(direction.x != 0 && direction.y != 0):
		direction = Vector2.ZERO

	# PLAYER TRIES TO MOVE AT ALL
	if(direction != Vector2.ZERO):
		ray.cast_to = direction * TILE_SIZE / 2