extends Area2D

@export var speed = 3  # How fast the player will move (pixels/sec).
@export var jump_speed = 4
@export var speed_inc = 0.3

signal start	# The bird starts
signal passed	# The bird passes a Tower
signal hit		# The bird is hit/flies off screen

var tower_locations = []

var screen_size
var playing = false

var speed_y = 0

func start_game():
	tower_locations = []
	screen_size = get_viewport_rect().size
	position = Vector2(0, screen_size.y / 2)
	speed_y = 0
	update_rotation()

# Called when the node enters the scene tree for the first time.
func _ready():
	screen_size = get_viewport_rect().size

# Called every frame
func _process(_delta):
	if Input.is_action_just_pressed("ui_accept"):
		if not playing:
			start_game()
			emit_signal("start")
			speed_y = 0
			playing = true
			$CollisionShape2D.set_deferred("disabled", false)
		speed_y = min(speed_y, 0) - 1 * jump_speed

	if not playing:
		return

	# Adjust the birds position
	speed_y += speed_inc
	
	position += Vector2(speed, speed_y * speed)
	
	var global = get_global_transform().get_origin()
	while global.x > tower_locations[0]:
		emit_signal("passed")
		tower_locations.pop_front()

	# Rotate the bird
	update_rotation()
	
	if position.y > screen_size.y: 
		emit_signal("hit")
		playing = false
		
func update_rotation():
	rotation = atan(speed_y / speed)

# Hit detection
func _on_Player_body_entered(_body):
	playing = false
	start_game()

	emit_signal("hit")
	$CollisionShape2D.set_deferred("disabled", true)
	
func _on_Tower_spawn(x):
	tower_locations.append(x)