class_name BaseLevel
extends Node2D

# 基础关卡脚本
# 负责处理通用的关卡逻辑，如玩家生成

@onready var spawn_points = $SpawnPoints if has_node("SpawnPoints") else null
@onready var players_container = $Objects/Players if has_node("Objects/Players") else self

func _ready():
	# 延时一帧确保所有子节点就绪
	call_deferred("_spawn_player")
	
	# 连接到多人会话
	# 获取当前场景名字作为 Session ID
	_current_session_id = SceneManager.get_current_scene_name()
	if _current_session_id == "":
		_current_session_id = "square" # Fallback for direct run
	
	# 如果是私人场景，生成唯一的 Session ID (e.g., room_123)
	if _current_session_id in PRIVATE_SCENES:
		_current_session_id = _current_session_id + "_" + str(AuthManager.current_user_id)
		print("BaseLevel: 进入私密房间实例: ", _current_session_id)
		
	print("BaseLevel: Preparing to join session: ", _current_session_id)
	
	# 如果 WebSocket 已连接，直接加入
	if WebSocketManager._socket.get_ready_state() == WebSocketPeer.STATE_OPEN:

		_join_session_with_player(_current_session_id)
	else:
		# 否则等待连接成功信号
		WebSocketManager.connected_to_server.connect(func(): _join_session_with_player(_current_session_id))
	
	# 连接远程玩家相关信号
	WebSocketManager.session_joined.connect(_on_session_joined)
	WebSocketManager.user_joined.connect(_on_user_joined)
	WebSocketManager.user_left.connect(_on_user_left)
	WebSocketManager.position_updated.connect(_on_position_updated)
	
	# Debug: Simulate fake player to verify rendering
	# get_tree().create_timer(2.0).timeout.connect(_debug_fake_activity)

func _exit_tree():
	# 场景卸载时不需要再做操作，交给 DoorTeleport 或其他切换逻辑显示处理
	pass

func _debug_fake_activity():
	print("BaseLevel: Starting fake player simulation")
	var fake_id = "fake_ghost"
	_on_user_joined({"user": {"userId": fake_id, "username": "Ghost"}, "position": {"x": 500, "y": 500}})
	
	for i in range(20):
		await get_tree().create_timer(0.5).timeout
		var new_pos = Vector2(500 + i * 20, 500 + i * 10)
		_on_position_updated({"userId": fake_id, "position": {"x": new_pos.x, "y": new_pos.y}})
		print("BaseLevel: Ghost moved to ", new_pos)

var remote_players: Dictionary = {} # userId -> RemotePlayer instance
var remote_player_scene = preload("res://scenes/characters/remote_player.tscn")
var _player_spawned: bool = false # Track if local player has been spawned
var _local_player: Node = null # Reference to the local player node
var _position_update_timer: float = 0.0 # Throttle timer for position updates
var _current_session_id: String = "" # Cache session ID to avoid race condition on exit
const POSITION_UPDATE_INTERVAL: float = 0.125 # Send at most 8 times per second
const PRIVATE_SCENES = ["room"] # List of scenes that should be private instances

func _on_session_joined(data: Dictionary):
	# 对账远程玩家列表，使用 position.mapId 过滤
	if not data.has("users"):
		return
	
	var current_map = _current_session_id
	if current_map == "":
		current_map = SceneManager.get_current_scene_name()
		if current_map == "":
			current_map = "square"
	
	print("BaseLevel: 同步会话 - 当前场景: ", current_map, ", 收到用户数: ", data.users.size())
	
	# 1. 收集服务器返回的、且 mapId 匹配当前场景的用户ID
	var valid_user_ids: Array = []
	var valid_users: Dictionary = {}  # userId -> user data
	
	for user in data.users:
		if not user.has("userId") or str(user.userId) == str(AuthManager.current_user_id):
			continue
		
		# 检查 position.mapId 是否匹配当前场景
		var user_map_id = ""
		if user.has("position") and user.position != null:
			if typeof(user.position) == TYPE_DICTIONARY and user.position.has("mapId"):
				user_map_id = str(user.position.mapId)
			print("BaseLevel: 用户 ", user.userId, " 的位置数据: ", user.position)
		else:
			print("BaseLevel: 用户 ", user.userId, " 没有位置数据")
		
		print("BaseLevel: 用户 ", user.userId, " mapId=", user_map_id, ", 当前场景=", current_map)
		
		if user_map_id == current_map:
			var uid = str(user.userId)
			valid_user_ids.append(uid)
			valid_users[uid] = user
			print("BaseLevel: 添加有效用户: ", uid)
		else:
			# mapId 不匹配，这是"幽灵玩家"
			print("BaseLevel: 跳过 mapId 不匹配的玩家: ", user.get("userId"), " (mapId=", user_map_id, ", expected=", current_map, ")")
	
	# 2. 清理幽灵：移除本地有但不在有效列表中的玩家
	var local_user_ids = remote_players.keys()
	for user_id in local_user_ids:
		if str(user_id) not in valid_user_ids:
			print("BaseLevel: 清理幽灵玩家: ", user_id)
			_remove_remote_player(user_id)
	
	# 3. 添加或更新有效的玩家
	for uid in valid_user_ids:
		var user = valid_users[uid]
		if remote_players.has(uid):
			# 已存在，更新位置
			_update_remote_player_position(user)
		else:
			# 不存在，创建新玩家
			print("BaseLevel: 创建远程玩家: ", uid)
			_add_remote_player(user)

func _on_user_joined(data: Dictionary):
	var user = data.get("user", {})
	if user.has("userId"):
		print("BaseLevel: 新玩家加入: ", user.userId)
		if user.userId == AuthManager.current_user_id:
			return
		
		# 将 position 数据合并到 user 字典中，以便 _add_remote_player 统一处理
		if data.has("position"):
			user["position"] = data.position
			
		_add_remote_player(user)

func _on_user_left(data: Dictionary):
	var user_id = data.get("userId")
	if user_id:
		print("BaseLevel: 玩家离开: ", user_id)
		_remove_remote_player(user_id)

func _on_position_updated(data: Dictionary):
	var user_id = data.get("userId")
	
	if user_id and remote_players.has(user_id):
		var player = remote_players[user_id]
		# 数据可能直接是位置（扁平）或者包含在 position 字段中
		# 根据后端协议: { userId:..., position: {x,y...}, ... }
		var pos_data = data.get("position", {})
		if pos_data.is_empty():
			pos_data = data # 兼容扁平格式
		
		# print("BaseLevel: 收到位置更新: ", user_id, " Data: ", pos_data) # Debug log
		
		# 检查 mapId 是否匹配当前场景
		if pos_data.has("mapId") and str(pos_data.mapId) != "":
			var current_map = _current_session_id
			if current_map == "":
				current_map = "square"
			
			if str(pos_data.mapId) != current_map:
				print("BaseLevel: 收到异地位置更新，移除幽灵玩家: ", user_id, " (在该玩家在 ", pos_data.mapId, ")")
				_remove_remote_player(user_id)
				return
			
		if player.has_method("update_position") and pos_data.has("x") and pos_data.has("y"):
			player.update_position(Vector2(pos_data.x, pos_data.y))

func _add_remote_player(user_data: Dictionary):
	var user_id = str(user_data.get("userId", ""))
	if user_id == "":
		return
	
	# 防止重复创建
	if remote_players.has(user_id):
		return
		
	var remote_player = remote_player_scene.instantiate()
	
	# 使用统一的 setup 方法
	if remote_player.has_method("setup"):
		remote_player.setup(user_data)
	else:
		# Fallback: 手动设置属性 (如果脚本没更新)
		remote_player.position = Vector2.ZERO
		if user_data.has("position"):
			var p = user_data.position
			if p.has("x") and p.has("y"):
				remote_player.position = Vector2(p.x, p.y)
	
	# 添加到场景玩家容器
	if has_node("Objects/Players"):
		$Objects/Players.add_child(remote_player)
	else:
		add_child(remote_player)
		
	remote_players[user_id] = remote_player
	print("BaseLevel: 已创建远程玩家: ", user_id)

func _remove_remote_player(user_id):
	var uid = str(user_id)
	if remote_players.has(uid):
		var player = remote_players[uid]
		if is_instance_valid(player):
			player.queue_free()
		remote_players.erase(uid)

func _update_remote_player_position(user: Dictionary):
	var user_id = str(user.get("userId", ""))
	var player = remote_players.get(user_id)
	if not player or not is_instance_valid(player):
		return
	if user.has("position"):
		var pos = user.position
		if pos.has("x") and pos.has("y") and player.has_method("update_position"):
			player.update_position(Vector2(pos.x, pos.y))

func _join_session_with_player(session_id: String):
	# 检查是否有Token，如果没有则等待
	if WebSocketManager._auth_token == "":
		print("BaseLevel: Token not ready, waiting...")
		# 轮询等待Token就绪 (简单重试机制)
		await get_tree().create_timer(0.5).timeout
		_join_session_with_player(session_id)
		return

	# 等待玩家生成完毕
	if not _player_spawned or not _local_player:
		await get_tree().process_frame
		_join_session_with_player(session_id)
		return
		
	var pos = _local_player.global_position if is_instance_valid(_local_player) else Vector2.ZERO
	
	WebSocketManager.join_session(session_id, pos)
	
	# 强制广播一次位置更新，确保旧房间的玩家立即收到 "已切换地图" 的通知
	# 这能解决"需要移动两步幽灵才消失"的问题
	await get_tree().create_timer(0.1).timeout
	WebSocketManager.send_position_update(session_id, pos)

func _process(delta):
	# 发送位置更新 (节流机制)
	if not _player_spawned or not _local_player:
		return # Wait for player to be spawned
		
	if WebSocketManager._socket.get_ready_state() != WebSocketPeer.STATE_OPEN:
		return # WebSocket not connected
	
	if not is_instance_valid(_local_player):
		return # Player was freed
	
	# 检查 velocity 属性
	if not "velocity" in _local_player:
		return
	
	# 只有在移动时才更新计时器和发送
	if _local_player.velocity.length() > 0:
		_position_update_timer += delta
		if _position_update_timer >= POSITION_UPDATE_INTERVAL:
			_position_update_timer = 0.0
			# 使用 _current_session_id 确保有正确的 fallback
			var map_id = _current_session_id if _current_session_id != "" else "square"
			WebSocketManager.send_position_update(map_id, _local_player.global_position)



func _spawn_player():
	# 1. 确定出生位置
	var spawn_pos = Vector2.ZERO
	var spawn_name = SceneManager.get_next_spawn_name()
	
	print("BaseLevel: Checking spawn point for name: '", spawn_name, "'")
	
	# 查找逻辑：优先查找名为 spawn_name 的节点，其次找 DefaultSpawn
	var target_node_name = spawn_name if spawn_name != "" else "DefaultSpawn"
	var marker_node = null
	
	# 策略 A: 在 SpawnPoints 容器中查找
	if has_node("SpawnPoints"):
		marker_node = $SpawnPoints.get_node_or_null(target_node_name)
	
	# 策略 B: 如果没找到，在当前节点(根节点)下查找
	if marker_node == null:
		marker_node = get_node_or_null(target_node_name)
		
	# 如果找到了标记点，使用其位置
	if marker_node:
		spawn_pos = marker_node.global_position
		print("BaseLevel: Found spawn marker '", target_node_name, "' at ", spawn_pos)
	else:
		# 策略 C: 检查 SceneManager 是否有备用坐标 (兼容旧逻辑)
		var pos_param = SceneManager.get_next_scene_position()
		if pos_param != null:
			spawn_pos = pos_param
			print("BaseLevel: Using explicit position from SceneManager: ", spawn_pos)
		else:
			print("BaseLevel: Warning - Could not find marker '", target_node_name, "' and no explicit position set. Using (0,0)")
	
	# 2. 实例化玩家
	var player_scene = preload("res://scenes/characters/player.tscn")
	var player = player_scene.instantiate()
	player.global_position = spawn_pos
	
	# 添加到场景
	# 如果有Objects/Players容器则添加进去，否则直接添加到当前节点
	if has_node("Objects/Players"):
		$Objects/Players.add_child(player)
	else:
		add_child(player)
	
	print("BaseLevel: Player spawned at ", player.global_position)
	_local_player = player  # Save reference
	_player_spawned = true