# backend_singleton.py
# 共享后端单连接客户端实例和WebSocket连接管理
from typing import Optional, Callable
import threading
import asyncio
from threading import Thread
# 创建新的后端客户端
from WebSocket.BackendClient import BackendClient
from Utils.JD.JdUtils import JDListenerForGUI as JDListenerForGUI_WS
from Utils.Dy.DyUtils import DouYinListenerForGUI as DYListenerForGUI_WS
from Utils.Pdd.PddUtils import PddListenerForGUI as PDDListenerForGUI_WS

_backend_client = None


def set_backend_client(client: BackendClient) -> None:
    global _backend_client
    _backend_client = client


def get_backend_client() -> Optional[BackendClient]:
    return _backend_client


class WebSocketManager:
    """WebSocket连接管理器，统一处理后端连接和平台监听"""

    def __init__(self):
        self.backend_client = None
        self.platform_listeners = {}  # 存储各平台的监听器
        self.callbacks = {
            'log': None,
            'success': None,
            'error': None
        }

    def set_callbacks(self, log: Callable = None, success: Callable = None, error: Callable = None):
        """设置回调函数"""
        if log:
            self.callbacks['log'] = log
        if success:
            self.callbacks['success'] = success
        if error:
            self.callbacks['error'] = error

    def _log(self, message: str, level: str = "INFO"):
        """内部日志方法"""
        if self.callbacks['log']:
            self.callbacks['log'](message, level)
        else:
            print(f"[{level}] {message}")

    def connect_backend(self, token: str) -> bool:
        """连接后端WebSocket"""
        try:
            # 1 保存token到配置
            try:
                from config import set_saved_token
                set_saved_token(token)
            except Exception:
                pass

            # 2 获取或创建后端客户端
            backend = get_backend_client()

            if backend:
                # 3 如果有客户端更新token并重连
                backend.set_token(token)

                # 设置回调函数
                def _on_backend_success():
                    try:
                        self._log("连接服务成功", "SUCCESS")
                        if self.callbacks['success']:
                            self.callbacks['success']()
                    except Exception as e:
                        self._log(f"成功回调执行失败: {e}", "ERROR")

                def _on_backend_login(platform_name: str, store_id: str, cookies: str):
                    self._log(
                        f"收到后端登录指令: 平台={platform_name}, 店铺={store_id}, cookies_len={len(cookies) if cookies else 0}",
                        "INFO")
                    self._handle_platform_login(platform_name, store_id, cookies)

                backend.set_callbacks(success=_on_backend_success, login=_on_backend_login)

                if not backend.is_connected:
                    backend.connect()

                self.backend_client = backend
                self._log("令牌已提交，已连接后端。等待后端下发平台cookies后自动连接平台...", "SUCCESS")
                return True
            else:

                backend = BackendClient.from_exe_token(token)

                def _on_backend_login(platform_name: str, store_id: str, cookies: str):
                    self._log(
                        f"收到后端登录指令: 平台={platform_name}, 店铺={store_id}, cookies_len={len(cookies) if cookies else 0}",
                        "INFO")
                    self._handle_platform_login(platform_name, store_id, cookies)

                def _on_backend_success():
                    try:
                        self._log("连接服务成功", "SUCCESS")
                        if self.callbacks['success']:
                            self.callbacks['success']()
                    except Exception as e:
                        self._log(f"成功回调执行失败: {e}", "ERROR")

                backend.set_callbacks(login=_on_backend_login, success=_on_backend_success)
                backend.connect()

                set_backend_client(backend)
                self.backend_client = backend
                self._log("已创建后端客户端并连接。等待后端下发平台cookies...", "SUCCESS")
                return True

        except Exception as e:
            self._log(f"连接后端失败: {e}", "ERROR")
            if self.callbacks['error']:
                self.callbacks['error'](str(e))
            return False

    def _handle_platform_login(self, platform_name: str, store_id: str, cookies: str):
        """处理平台登录逻辑"""
        try:
            if platform_name == "京东" and store_id and cookies:
                self._start_jd_listener(store_id, cookies)
            elif platform_name == "抖音" and store_id and cookies:
                self._start_douyin_listener(store_id, cookies)
            elif platform_name == "千牛" and store_id and cookies:
                self._start_qianniu_listener(store_id, cookies)
            elif platform_name == "拼多多" and store_id and cookies:
                self._start_pdd_listener(store_id, cookies)
            else:
                self._log(f"不支持的平台或参数不全: {platform_name}", "WARNING")
        except Exception as e:
            self._log(f"启动平台监听失败: {e}", "ERROR")

    def _start_jd_listener(self, store_id: str, cookies: str):
        """启动京东平台监听"""
        try:
            def _runner():
                try:
                    listener = JDListenerForGUI_WS()
                    asyncio.run(listener.start_with_cookies(store_id, cookies))
                except Exception as e:
                    self._log(f"京东监听器运行异常: {e}", "ERROR")

            # 在新线程中启动监听器
            thread = Thread(target=_runner, daemon=True)
            thread.start()

            # 保存监听器引用
            self.platform_listeners[f"京东:{store_id}"] = {
                'thread': thread,
                'platform': '京东',
                'store_id': store_id
            }

            # 上报连接状态给后端
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": True
                    })
                except Exception as e:
                    self._log(f"上报连接状态失败: {e}", "WARNING")

            self._log("已启动京东平台监听", "SUCCESS")

        except Exception as e:
            self._log(f"启动京东平台监听失败: {e}", "ERROR")

            # 确保失败时也上报状态
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": False
                    })
                except Exception as send_e:
                    self._log(f"失败状态下报连接状态也失败: {send_e}", "ERROR")

    def _start_douyin_listener(self, store_id: str, cookies: str):
        """启动抖音平台监听"""
        try:
            def _runner():
                try:
                    import json
                    listener = DYListenerForGUI_WS()
                    # 将JSON字符串格式的cookies解析为字典
                    try:
                        cookie_dict = json.loads(cookies) if isinstance(cookies, str) else cookies
                    except json.JSONDecodeError as e:
                        self._log(f"❌ Cookie JSON解析失败: {e}", "ERROR")
                        return False
                    
                    result = asyncio.run(listener.start_with_cookies(store_id=store_id, cookie_dict=cookie_dict))
                    return result
                except Exception as e:
                    self._log(f"抖音监听器运行异常: {e}", "ERROR")
                    return False

            # 在新线程中启动监听器
            thread = Thread(target=_runner, daemon=True)
            thread.start()

            # 保存监听器引用
            self.platform_listeners[f"抖音:{store_id}"] = {
                'thread': thread,
                'platform': '抖音',
                'store_id': store_id,
            }

            # 更新监听器状态
            if f"抖音:{store_id}" in self.platform_listeners:
                self.platform_listeners[f"抖音:{store_id}"]['status'] = 'success'

            # 上报连接状态给后端
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": True
                    })
                    self._log("已上报抖音平台连接状态: 成功", "INFO")
                except Exception as e:
                    self._log(f"上报抖音平台连接状态失败: {e}", "WARNING")

            self._log("已启动抖音平台监听", "SUCCESS")

        except Exception as e:
            self._log(f"启动抖音平台监听失败: {e}", "ERROR")

            # 确保失败时也上报状态
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": False
                    })
                except Exception as send_e:
                    self._log(f"失败状态下报抖音平台连接状态也失败: {send_e}", "ERROR")

    def _start_qianniu_listener(self, store_id: str, cookies: str):
        """启动千牛平台监听"""
        try:
            # 这里可以添加千牛监听逻辑
            self._log("千牛平台监听功能待实现", "INFO")
        except Exception as e:
            self._log(f"启动千牛平台监听失败: {e}", "ERROR")

    def _start_pdd_listener(self, store_id: str, data: str):
        """启动拼多多平台监听"""
        try:
            def _runner():
                try:
                    listener = PDDListenerForGUI_WS(log_callback=self._log)
                    # 判断是登录参数还是Cookie
                    if self._is_pdd_login_params(data):
                        # 使用登录参数启动
                        result = asyncio.run(listener.start_with_login_params(store_id=store_id, login_params=data))
                    else:
                        # 使用Cookie启动（兼容旧方式）
                        result = asyncio.run(listener.start_with_cookies(store_id=store_id, cookies=data))
                    return result
                except Exception as e:
                    self._log(f"拼多多监听器运行异常: {e}", "ERROR")
                    return False

            # 在新线程中启动监听器
            thread = Thread(target=_runner, daemon=True)
            thread.start()

            # 保存监听器引用
            self.platform_listeners[f"拼多多:{store_id}"] = {
                'thread': thread,
                'platform': '拼多多',
                'store_id': store_id,
            }

            # 更新监听器状态
            if f"拼多多:{store_id}" in self.platform_listeners:
                self.platform_listeners[f"拼多多:{store_id}"]['status'] = 'success'

            # 上报连接状态给后端
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": True
                    })
                    self._log("已上报拼多多平台连接状态: 成功", "INFO")
                except Exception as e:
                    self._log(f"上报拼多多平台连接状态失败: {e}", "WARNING")

            self._log("已启动拼多多平台监听", "SUCCESS")

        except Exception as e:
            self._log(f"启动拼多多平台监听失败: {e}", "ERROR")

            # 确保失败时也上报状态
            if self.backend_client:
                try:
                    self.backend_client.send_message({
                        "type": "connect_message",
                        "store_id": store_id,
                        "status": False
                    })
                except Exception as send_e:
                    self._log(f"失败状态下报拼多多平台连接状态也失败: {send_e}", "ERROR")

    def _is_pdd_login_params(self, data: str) -> bool:
        """判断是否为拼多多登录参数"""
        try:
            import json
            parsed_data = json.loads(data)
            return (parsed_data.get("data", {}).get("login_params") is not None)
        except:
            return False

    def send_message(self, message: dict):
        """发送消息到后端"""
        if self.backend_client and self.backend_client.is_connected:
            return self.backend_client.send_message(message)
        else:
            raise Exception("后端未连接")

    def disconnect_all(self):
        """断开所有连接"""
        try:
            # 断开后端连接
            if self.backend_client:
                self.backend_client.disconnect()
                self.backend_client = None

            # 清理平台监听器
            self.platform_listeners.clear()

            self._log("所有连接已断开", "INFO")
        except Exception as e:
            self._log(f"断开连接时发生错误: {e}", "ERROR")


# 全局WebSocket管理器实例
_websocket_manager = None


def get_websocket_manager() -> WebSocketManager:
    """获取全局WebSocket管理器实例"""
    global _websocket_manager
    if _websocket_manager is None:
        _websocket_manager = WebSocketManager()
    return _websocket_manager