extends Node2D

@export var segements_holder : Node2D
var segements : Array[snake_segment]
@export var SNAKE_SPEED : float = 0.2
@export var max_snake_speed : float = 1
@export var snake_line : Line2D
@export var player : Node2D
var food : float = 8
@export var max_food = 8
@export var food_drain = 0.1
@export var food_gain = 0.2
var pit_apples : int = 0
var burn_apples : float = 0
var score : int = 0

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	Router.activate_seg.connect(activate_segment)
	Router.eat_apple.connect(rec_apple)
	Router.pickup_apple.connect(pickupApple)
	Router.burn_apple.connect(burnApple)
	food = max_food
	#segements = get_children() as Array[snake_segment]
	segements.assign(segements_holder.get_children())
	for i in segements.size():
		if i == 0:
			segements[i].is_head = true
			
		else:
			segements[i].next_segment = segements[i-1]
		if i < segements.size()-1:
				segements[i].door.prev_seg = segements[i+1]
		segements[i].snake_speed = SNAKE_SPEED
		segements[i].seg_id = i
		#segements[i].z_index = 100-i
	activate_segment(0)


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	redraw_line()
	
	if(Input.is_action_just_pressed("test_add_segment")):
		add_segment()
		
	
	burn_apples -= 0.3 * delta
	if burn_apples <= 0:
		burn_apples = 0
	else:
		food += food_gain * delta
	
	if food > max_food:
		food = max_food
	food -= food_drain * delta
	
	if food <= 0:
		Router.die.emit()
	
	if SNAKE_SPEED > max_snake_speed:
		SNAKE_SPEED = max_snake_speed
	
	pass

func activate_segment(act_segment : int):
	Router.current_seg = segements[act_segment]
	Router.cur_id = act_segment
	player.call_deferred("reparent",Router.current_seg)
	#player.reparent(Router.current_seg)
	#for i in segements.size():
		#if act_segment == i:
			#segements[i].become_real()
			#
		#else: 
			#segements[i].become_fake()
			

func redraw_line():
	snake_line.clear_points()
	for segment in segements:
		snake_line.add_point(segment.global_position)

func add_segment(): 
	var new_segement : Node2D = load("res://prefabs/snake_segment.tscn").instantiate()
	new_segement.global_position = segements[-1].global_position
	new_segement.next_segment = segements[-1]
	new_segement.door_disabled = true
	segements.append(new_segement)
	segements_holder.add_child(new_segement)
	pass

func rec_apple():
	#food += 1
	pit_apples += 1
	SNAKE_SPEED += 0.03
	score += 5
	add_segment()
	for seg in segements:
		seg.snake_speed = SNAKE_SPEED

func pickupApple():
	pit_apples -= 1

func burnApple():
	burn_apples += 1
	score += 5