extends Area2D

signal died
signal damage_taken
# signal shield_damage
# signal shield_ui

@export var speed = 150
@export var cooldown = 0.25
@export var bullet_scene : PackedScene
@export var max_shield: int = 10
var shield: int = max_shield:
    set = set_shield

var can_shoot = true
var shader_active = false

@onready var screensize = get_viewport_rect().size
@onready var explosion = $Explosion
@onready var gun_cooldown = $GunCooldown
@onready var ship = $Ship
@onready var cooldown_timer = $CooldownTimer

func _ready():
    start()

func start():
    set_process(true)
    $Ship.show()
    position = Vector2(screensize.x / 2, screensize.y - 64)
    shield = max_shield
    $GunCooldown.wait_time = cooldown

func _process(delta):
    var input = Input.get_vector("left", "right", "up", "down")
    if input.x > 0:
        $Ship.frame = 2
        $Ship/Boosters.animation = "right"
    elif input.x < 0:
        $Ship.frame = 0
        $Ship/Boosters.animation = "left"
    else:
        $Ship.frame = 1
        $Ship/Boosters.animation = "forward"
    position += input * speed * delta
    position = position.clamp(Vector2(8, 8), screensize - Vector2(8, 8))
    if Input.is_action_pressed("shoot"):
        shoot()

func shoot():
    if not can_shoot:
        return
    can_shoot = false
    $GunCooldown.start()
    var b = bullet_scene.instantiate()
    get_tree().root.add_child(b)
    b.start(position + Vector2(0, -8))

func set_shield(value: int):
    var old_value: int = shield
    shield = min(max_shield, value)
    EventBus.shield_changed.emit(max_shield, old_value, shield)
   # shield_damage.emit()
    if shield <= 0:
        set_process(false)
        $Ship.hide()
        $Explosion.show()
        $Explosion/AnimationPlayer.play("explosion-one-shot")
        await $Explosion/AnimationPlayer.animation_finished
        died.emit()

func _on_gun_cooldown_timeout() -> void:
            can_shoot = true

func _on_area_entered(area):
    if area.is_in_group("enemies"):
        area.explode()
        shield -= max_shield / 2
        damage_taken.emit()
    if area.is_in_group("enemy_bullets"):
        damage_taken.emit()


func _on_damage_taken() -> void:
  # emit_signal("shield_ui")
  shader_active = true
  $Ship.material.set_shader_parameter("toggle", 1.0)
  await get_tree().create_timer(1).timeout
  shader_active = false
  $Ship.material.set_shader_parameter("toggle", 0.0)