const net = require('net');
const EventEmitter = require('events');

class GateServer extends EventEmitter {
    constructor(port, host) {
        super();
        this.port = port;
        this.host = host;
        this.server = net.createServer(this.handleConnection.bind(this));
        this.clients = new Map(); // 用于存储连接的客户端
        this.gateEngineRunning = true;
    }

    start() {
        this.server.listen(this.port, this.host, () => {
            console.log(`GateServer is listening on ${this.host}:${this.port}`);
        });

        // 处理信号
        process.on('SIGINT', () => this.signalHandler('SIGINT'));
        process.on('SIGTERM', () => this.signalHandler('SIGTERM'));
    }

    signalHandler(signal) {
        if (signal === 'SIGINT' || signal === 'SIGTERM') {
            this.gateEngineRunning = false;
            console.log(`[SIGNAL] ${signal} received, shutting down...`);
            this.stop();
        }
    }

    handleConnection(socket) {
        const clientId = `${socket.remoteAddress}:${socket.remotePort}`;
        console.log(`New client connected: ${clientId}`);
        this.clients.set(clientId, socket); // 存储客户端连接
        this.emit('connection', socket);

        socket.on('data', (data) => {
            this.emit('data', socket, data);
        });

        socket.on('end', () => {
            console.log(`Client disconnected: ${clientId}`);
            this.clients.delete(clientId); // 移除断开的客户端
            this.emit('end', socket);
        });

        socket.on('error', (err) => {
            console.error(`Socket error for client ${clientId}:`, err);
            this.clients.delete(clientId); // 移除出错的客户端
            this.emit('error', err);
        });
    }

    // 新增方法：获取当前连接的客户端数量
    getClientCount() {
        return this.clients.size;
    }

    // 新增方法：向所有客户端广播消息
    broadcast(message) {
        this.clients.forEach((client) => {
            client.write(message);
        });
    }

    // 新增方法：停止服务器
    stop() {
        this.server.close(() => {
            console.log('GateServer has been stopped.');
        });
    }
}

module.exports = GateServer;