extends AnimatableBody2D
class_name snake_segment

@export var is_head : bool = false
var direction : Vector2 = Vector2.RIGHT
var want_direction : Vector2 = Vector2.RIGHT

@export var next_segment : Node2D
@export var door : Node2D
@export var door_disabled : bool = false
var start_pos : Vector2
var target_pos : Vector2
var move_progress : float
var seg_id : int 

var snake_speed : float = 1
# if snake is the head, it chooses where it goes
# if snake is not the head, it goes where the one infront went

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	target_pos = position
	start_pos = position
	get_new_target()
	become_real()


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	move_progress += delta * snake_speed
	if(!Router.player_mode):
		if Input.is_action_just_pressed("left"):
			want_direction = Vector2.LEFT
		elif Input.is_action_just_pressed("right"):
			want_direction = Vector2.RIGHT
		elif Input.is_action_just_pressed("up"):
			want_direction = Vector2.UP
		elif Input.is_action_just_pressed("down"):
			want_direction = Vector2.DOWN 
	position = lerp(start_pos,target_pos,move_progress)
	if move_progress >= 1:
		get_new_target()
	
func get_new_target():
	start_pos=target_pos
	if is_head:
		if want_direction != direction*-1:
			direction = want_direction
		target_pos = start_pos + (direction * 320)
	else:
		target_pos = next_segment.position
	move_progress = 0

func become_real():
	collision_layer = 1
	z_index = 10
	modulate = Color.WHITE
	pass

func become_fake():
	#z_index = 0
	#modulate = Color.DIM_GRAY
	#collision_layer = 2
	pass


func _on_eat_die_box_area_entered(area: Area2D) -> void:
	if(area.is_in_group("apple")):
		area.queue_free()
		print("mmm tasty apple")
		Router.eat_apple.emit()
	if(area.is_in_group("wall")):
		Router.die.emit()
	if(area.is_in_group("snake")):
		if (area.get_parent().is_head):
			Router.die.emit()