class_name PowerUpSpawner extends Node2D

@export var spawn_interval: float = 5.0
@export var test_mode: bool = true

# PackedScene for the pickup template — configure in the scene editor.
@export var pickup_scene: PackedScene

@onready var screensize: Vector2 = get_viewport().content_scale_size
@onready var spawn_timer: Timer = $SpawnTimer

# All weapon resources to spawn as pickups.
# Populate in the editor with your weapon_shot resources.
@export var all_weapon_shots: Array[WeaponShot] = []

var _pickups_spawned: int = 0
var _pickups_remaining: int = 0

func _ready() -> void:
    if spawn_timer == null:
        return
    spawn_timer.wait_time = spawn_interval


func _on_spawn_timer_timeout() -> void:
    if test_mode:
        _spawn_test_pickups()
    else:
        # TODO: normal mode — spawn a single random pickup.
        pass


func _spawn_test_pickups() -> void:
    for weapon: WeaponShot in all_weapon_shots:
        if weapon == null or weapon.shot_name.is_empty():
            continue

        var pickup := _spawn_pickup(weapon)
        if not is_instance_valid(pickup):
            continue  # skipped — no valid icon

        # Random position within viewport, with edge padding.
        var margin: float = 15.0
        pickup.position = Vector2(
            randf_range(margin, screensize.x - margin),
            randf_range(margin, screensize.y - margin)
        )

        add_child(pickup)
        _pickups_spawned += 1
        _pickups_remaining = _pickups_spawned

    # Pause the timer while pickups are on screen; resume when all gone.
    if spawn_timer != null:
        spawn_timer.stop()


func pickup_collected() -> void:
    # Called by the player when a pickup is collected.
    # Decrement counter; resume timer once all pickups are gone.
    _pickups_remaining = max(0, _pickups_remaining - 1)
    if _pickups_remaining <= 0:
        if spawn_timer != null:
            spawn_timer.start()
        _pickups_spawned = 0


func _spawn_pickup(weapon: WeaponShot) -> Area2D:
    # Validate that the weapon has a pickup icon configured.
    if weapon.pickup_icon == null:
        printerr("[PowerUpSpawner] No pickup icon set for weapon: ", weapon.shot_name)
        var dead := Area2D.new()  # return a dead node — caller skips it
        dead.queue_free()
        return dead

    # Instantiate the scene template and attach weapon metadata.
    var pickup := pickup_scene.instantiate() as Area2D
    if pickup == null:
        printerr("[PowerUpSpawner] Failed to instantiate pickup scene.")
        return null

    pickup.set_meta("weapon_shot", weapon)

    # Add the icon node at runtime (scene has no TextureRect to avoid null-dependency issues).
    var icon := TextureRect.new()
    icon.texture = weapon.pickup_icon
    icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
    icon.size = Vector2(16, 16)
    pickup.add_child(icon)

    return pickup