const net = require("net");

class TelnetConnection {

    constructor(config){

        this.host = config.host;
        this.port = config.port;
        this.reconnectDelay = config.reconnectDelay || 30000;

        this.socket = null;

        this.dataListeners = [];
        this.connectionListeners = [];

        this.connect();
    }

    connect(){

        console.log("Connecting to FluidNC:", this.host);

        this.socket = net.createConnection({
            host: this.host,
            port: this.port
        });

        this.socket.on("connect",()=>{

            console.log("FluidNC connected");

            this.connectionListeners.forEach(fn=>fn(true));

        });

        this.socket.on("data",(data)=>{

            const msg = data.toString();

            this.dataListeners.forEach(fn=>fn(msg));

        });

        this.socket.on("close",()=>{

            console.log("FluidNC disconnected");

            this.connectionListeners.forEach(fn=>fn(false));

            setTimeout(()=>{
                this.connect();
            }, this.reconnectDelay);

        });

        this.socket.on("error",(err)=>{
            console.log("Telnet error:",err.message);
        });

    }

    send(cmd){

        if(!this.socket) return;

        this.socket.write(cmd+"\n");

    }

    realtime(cmd){

        if(!this.socket) return;

        this.socket.write(cmd);

    }

    onData(fn){
        this.dataListeners.push(fn);
    }

    onConnection(fn){
        this.connectionListeners.push(fn);
    }

}

module.exports = TelnetConnection;