import { NetConfig, DefaultNetConfig } from './NetConfig';
import { NetEvent } from './NetEvent';
import { PlatformAdapter, ClientConfig } from './PlatformAdapter';

/**
 * 网络管理器单例
 * 负责管理网络连接和消息通信
 */
export class NetManager {
    private static _instance: NetManager | null = null;
    
    /** TSRPC Client 实例 (HttpClient) */
    private _client: any = null;
    
    /** 是否已连接 */
    private _isConnected: boolean = false;
    
    /** 网络配置 */
    private _config: NetConfig | null = null;
    
    /** 重连计数 */
    private _reconnectCount: number = 0;
    
    /** 重连定时器 */
    private _reconnectTimer: any = null;
    
    /** 事件监听器 */
    private _eventListeners: Map<string, Function[]> = new Map();

    private constructor() {}

    /**
     * 获取单例实例
     */
    static getInstance(): NetManager {
        if (!this._instance) {
            this._instance = new NetManager();
        }
        return this._instance;
    }

    /**
     * 设置服务协议 (必须在 init 之前调用)
     * @param serviceProto 从 shared 目录导入的协议定义
     */
    setServiceProto(serviceProto: any): void {
        PlatformAdapter.setServiceProto(serviceProto);
    }

    /**
     * 初始化网络管理器
     * @param config 网络配置
     */
    init(config: NetConfig): void {
        this._config = {
            ...DefaultNetConfig,
            ...config
        } as NetConfig;

        console.log('[NetManager] Initialized with config:', this._config);
        console.log('[NetManager] Platform:', PlatformAdapter.getPlatformInfo());
    }

    /**
     * 连接服务器
     */
    async connect(): Promise<boolean> {
        try {
            console.log('[NetManager] Connecting to server:', this._config.serverUrl);
            
            // 创建客户端配置
            const clientConfig: ClientConfig = {
                server: this._config.serverUrl,
                json: true,
                timeout: this._config.timeout
            };

            // 根据平台创建对应的客户端
            this._client = PlatformAdapter.createClient(clientConfig);

            // HttpClient 不需要显式连接,创建即可使用
            // 如果未来需要 WebSocket 支持,可以在这里添加 connect() 调用
            
            this._isConnected = true;
            this._reconnectCount = 0;
            
            this.emit(NetEvent.Connected);
            console.log('[NetManager] Client created successfully');
            
            // client 可能不需要显式连接
            // 对于 WsClient 需要调用 connect()
            
            this._isConnected = true;
            this._reconnectCount = 0;
            
            this.emit(NetEvent.Connected);
            console.log('[NetManager] Connected successfully');
            
            return true;
        } catch (error) {
            console.error('[NetManager] Connection failed:', error);
            this.emit(NetEvent.Error, error);
            
            // 尝试重连
            if (this._config.autoReconnect) {
                this.scheduleReconnect();
            }
            
            return false;
        }
    }

    /**
     * 断开连接
     */
    disconnect(): void {
        if (!this._isConnected) {
            return;
        }
        // HttpClient 无需显式断开连接
        // 如果使用 WebSocket，可以在这里调用 disconnect()
        
        this._isConnected = false;
        this._client = null;
        if(this._reconnectTimer){
            this._reconnectTimer = null;
        }

        // TODO: 调用客户端的断开连接方法
        if (this._client && typeof this._client.disconnect === 'function') {
            this._client.disconnect();
        }

        this._isConnected = false;
        this._client = null;
        
        this.emit(NetEvent.Disconnected);
        console.log('[NetManager] Disconnected');
    }

    /**
     * 调用 API
     * @param apiName API 名称
     * @param req 请求参数
     */
    async callApi<Req, Res>(apiName: string, req: Req): Promise<Res | null> {
        if (!this._isConnected || !this._client) {
            console.error('[NetManager] Not connected');
            return null;
        }

        try {
            console.log(`[NetManager] Calling API: ${apiName}`, req);
            
            // TODO: 根据实际的协议定义调用 API
            const result = await this._client.callApi(apiName, req);
            
            if (result.isSucc) {
                console.log(`[NetManager] API ${apiName} success:`, result.res);
                return result.res;
            } else {
                console.error(`[NetManager] API ${apiName} failed:`, result.err);
                return null;
            }
        } catch (error) {
            console.error(`[NetManager] API ${apiName} error:`, error);
            this.emit(NetEvent.Error, error);
            return null;
        }
    }

    /**
     * 监听消息
     * @param msgName 消息名称
     * @param handler 处理函数
     */
    listenMsg(msgName: string, handler: Function): void {
        if (!this._client) {
            console.error('[NetManager] Client not initialized');
            return;
        }

        console.log(`[NetManager] Listening message: ${msgName}`);
        
        // TODO: 根据实际的 TSRPC 客户端实现监听消息
        if (typeof this._client.listenMsg === 'function') {
            this._client.listenMsg(msgName, handler);
        }
    }

    /**
     * 发送消息
     * @param msgName 消息名称
     * @param msg 消息内容
     */
    sendMsg(msgName: string, msg: any): void {
        if (!this._isConnected || !this._client) {
            console.error('[NetManager] Not connected');
            return;
        }

        console.log(`[NetManager] Sending message: ${msgName}`, msg);
        
        // TODO: 根据实际的 TSRPC 客户端实现发送消息
        if (typeof this._client.sendMsg === 'function') {
            this._client.sendMsg(msgName, msg);
        }
    }

    /**
     * 安排重连
     */
    private scheduleReconnect(): void {
        if (!this._config) {
            return;
        }

        if (this._reconnectCount >= (this._config.maxReconnectTimes || 5)) {
            console.error('[NetManager] Max reconnect times reached');
            this.emit(NetEvent.ReconnectFailed);
            return;
        }

        this._reconnectCount++;
        console.log(`[NetManager] Scheduling reconnect (${this._reconnectCount}/${this._config.maxReconnectTimes})...`);
        
        this.emit(NetEvent.Reconnecting, this._reconnectCount);
        
        this._reconnectTimer = setTimeout(() => {
            this.reconnect();
        }, this._config.reconnectInterval || 3000);
    }

    /**
     * 重新连接
     */
    private async reconnect(): Promise<void> {
        console.log('[NetManager] Reconnecting...');
        
        const success = await this.connect();
        
        if (success) {
            this.emit(NetEvent.ReconnectSuccess);
        } else if (this._config?.autoReconnect) {
            this.scheduleReconnect();
        }
    }

    /**
     * 监听网络事件
     * @param event 事件名称
     * @param callback 回调函数
     */
    on(event: NetEvent, callback: Function): void {
        if (!this._eventListeners.has(event)) {
            this._eventListeners.set(event, []);
        }
        this._eventListeners.get(event)!.push(callback);
    }

    /**
     * 取消监听网络事件
     * @param event 事件名称
     * @param callback 回调函数
     */
    off(event: NetEvent, callback: Function): void {
        const listeners = this._eventListeners.get(event);
        if (listeners) {
            const index = listeners.indexOf(callback);
            if (index > -1) {
                listeners.splice(index, 1);
            }
        }
    }

    /**
     * 触发事件
     * @param event 事件名称
     * @param args 事件参数
     */
    private emit(event: NetEvent, ...args: any[]): void {
        const listeners = this._eventListeners.get(event);
        if (listeners) {
            listeners.forEach(callback => {
                try {
                    callback(...args);
                } catch (error) {
                    console.error('[NetManager] Event callback error:', error);
                }
            });
        }
    }

    /**
     * 获取连接状态
     */
    get isConnected(): boolean {
        return this._isConnected;
    }

    /**
     * 获取客户端实例
     */
    get client(): any {
        return this._client;
    }
}