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
var start_pos : Vector2
var target_pos : Vector2
var move_progress : float

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()


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	move_progress += delta * snake_speed
	if Input.get_vector("left","right","up","down").length() > 0:
		want_direction = Input.get_vector("left","right","up","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():
	#activate colliders
	z_index = 10
	modulate = Color.WHITE
	pass

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