extends SceneTree
## 道具系统回归测试（时间驱动）：
## L1 双发 → 拾取升级 L2 四发 → 直设 L3 六发（4 直射+2 斜射）
## → 直设 L4 十二发（6 直射+4×22°+2×30°）
## → 满级拾取 +500 分 → 死亡降一级 → 掉落标记敌机死亡产出道具
## 注意：SceneTree._initialize 中 add_child 后节点 _ready 会在首帧才执行，
## 因此容器引用在首个 _process 里惰性获取。
## 运行：godot --headless -s tests/powerup_test.gd

const GLOBAL_TIMEOUT := 30.0

var _phase := 0
var _step := 0
var _phase_time := 0.0
var _time := 0.0
var _game: Game
var _pbullets: Node2D
var _powerups: Node2D
var _score_before := 0
var _fails: Array[String] = []


func _initialize() -> void:
	_game = (load("res://scenes/game.tscn") as PackedScene).instantiate()
	root.add_child(_game)
	print("[powerup_test] game instantiated")


func _fail(msg: String) -> void:
	_fails.append(msg)
	print("[FAIL] " + msg)


func _next_phase() -> void:
	_phase += 1
	_step = 0
	_phase_time = 0.0


func _restart_step_timer() -> void:
	_step += 1
	_phase_time = 0.0


## 容器引用就绪前不进入任何阶段（_ready 在首帧执行）
func _ensure_refs() -> bool:
	if _pbullets == null:
		_pbullets = _game.get_node_or_null("PlayerBullets") as Node2D
		_powerups = _game.get_node_or_null("Powerups") as Node2D
	return _pbullets != null and _powerups != null


## 清空玩家弹容器并返回清空前数量
func _count_and_clear_bullets() -> int:
	var children := _pbullets.get_children()
	var n := children.size()
	for bullet in children:
		_pbullets.remove_child(bullet)
		(bullet as Node).queue_free()
	return n


func _spawn_pickup_at_player() -> void:
	var pickup := Powerup.new()
	pickup.position = _game.player.global_position
	_powerups.add_child(pickup)


func _check_volley(expected: int, level_name: String) -> void:
	var n := _count_and_clear_bullets()
	Input.action_release("fire")
	if n != expected:
		_fail("%s volley=%d expected %d" % [level_name, n, expected])
	else:
		print("[powerup_test] %s volley ok: %d bullets" % [level_name, n])


func _finish() -> bool:
	if _fails.is_empty():
		print("[powerup_test] PASS")
	else:
		print("[powerup_test] FAIL: %d issue(s)" % _fails.size())
	quit(0 if _fails.is_empty() else 1)
	return true


func _process(delta: float) -> bool:
	_time += delta
	if _time > GLOBAL_TIMEOUT:
		_fail("global timeout in phase %d" % _phase)
		return _finish()
	if not _ensure_refs():
		return false

	_phase_time += delta
	match _phase:
		0:
			if _step == 0:
				Input.action_press("fire")
				_restart_step_timer()
			elif _phase_time >= 0.1:
				_check_volley(2, "L1")
				_next_phase()
		1:
			match _step:
				0:
					_spawn_pickup_at_player()
					_restart_step_timer()
				1:
					if _phase_time >= 0.6:
						if _game.player.weapon_level != 2:
							_fail("pickup did not level up: level=%d" % _game.player.weapon_level)
						elif _powerups.get_child_count() != 0:
							_fail("pickup not consumed: %d left" % _powerups.get_child_count())
						else:
							print("[powerup_test] pickup -> L2 ok")
						Input.action_press("fire")
						_restart_step_timer()
				2:
					if _phase_time >= 0.1:
						_check_volley(4, "L2")
						_next_phase()
		2:
			match _step:
				0:
					_game.player.weapon_level = 3
					Input.action_press("fire")
					_restart_step_timer()
				1:
					if _phase_time >= 0.1:
						_check_volley(6, "L3")
						_game.player.weapon_level = 4
						Input.action_press("fire")
						_restart_step_timer()
				2:
					if _phase_time >= 0.1:
						_check_volley(12, "L4")
						_next_phase()
		3:
			if _step == 0:
				_score_before = _game.score
				_spawn_pickup_at_player()
				_restart_step_timer()
			elif _phase_time >= 0.6:
				if _game.player.weapon_level != 4:
					_fail("capped pickup changed level: %d" % _game.player.weapon_level)
				elif _game.score != _score_before + 500:
					_fail("capped pickup score: %d -> %d (expected +500)" % [_score_before, _game.score])
				else:
					print("[powerup_test] capped pickup +500 ok")
				_next_phase()
		4:
			if _step == 0:
				_game.player.die()
				_restart_step_timer()
			elif _phase_time >= 0.1:
				if _game.player.weapon_level != 3:
					_fail("death downgrade: level=%d expected 3" % _game.player.weapon_level)
				else:
					print("[powerup_test] death downgrade 4->3 ok")
				_next_phase()
		5:
			if _step == 0:
				var enemy := EnemySmall.new()
				enemy.setup(270.0, 200.0, 100.0)
				enemy.drops_powerup = true
				_game._enemies.add_child(enemy)
				enemy.apply_damage(99)
				_restart_step_timer()
			elif _phase_time >= 0.5:
				if _powerups.get_child_count() != 1:
					_fail("dropper enemy produced %d powerups (expected 1)" % _powerups.get_child_count())
				else:
					print("[powerup_test] dropper spawn ok")
				_next_phase()
		6:
			if _step == 0:
				# 清掉前面阶段残留的道具再验证 Boss 必掉 P
				for pickup in _powerups.get_children():
					_powerups.remove_child(pickup)
					(pickup as Node).queue_free()
				var boss := _game.spawn_boss(1.0)
				boss.apply_damage(99999)
				_restart_step_timer()
			elif _phase_time >= 1.2:
				var kinds := []
				for pickup in _powerups.get_children():
					kinds.append((pickup as Powerup).kind)
				if kinds != [Powerup.Kind.POWER]:
					_fail("boss drop kinds=%s expected [POWER]" % str(kinds))
				else:
					print("[powerup_test] boss always drops POWER ok")
				return _finish()
	return false