const app = express();
const PORT = 3000;
const http = require('http').Server(app);

http.listen(PORT, ()=>{ console.log('server listening. Port:' + PORT); });

let messages=[];

app.use(
    (req,res,next)=>{
	console.log({
	    url:req.url,
	    headers:req.headers
	});
	next();
    }
);

//
// client code
//
app.get('/index.html',
	(req,res)=>{  res.sendFile(__dirname+`/html/client.html` )}
       );

//
// soket communication
//
const io = require('socket.io')(http,{
    path:"/socket/"  // change path name to socket io
});

io.on('connection',socket=>{
    const room=process.argv[2] ? process.argv[2] : "Roomhogehoge"; //auth
    const remoteIP=socket.request.headers["x-remote-addr"]? socket.request.headers["x-remote-addr"].split(",")[0]: "undef";
    const from=`${decodeURI(socket.request.headers.from)}[${remoteIP}]`;
    if(decodeURI(socket.request.headers.room)===room){
	//room entry 
	(()=>{
	    const msg={
		from,
		at    :(new Date()).toString(),
		message:`${from} enters the room.`
	    };
	    messages.map( msg=>{
		socket.emit("message",msg);
	    });
	    messages.push(msg);
	    io.emit("message",msg);
	})();

	//room exit
	socket.on("disconnect",()=>{
	    const msg={
		from,
		at  :(new Date()).toString(),
		message : `${from} exits from the room.`
	    };
	    messages.push(msg);
	    io.emit("message",msg);
	})
	
	// message receive
	socket.on("message", msg=>{
	    try{
		const _msg={
		    from,
		    at:(new Date()).toString(),
		    message:msg.message
		};
		messages.push(_msg);
		io.emit("message",_msg)
	    }catch(e){
		console.log(e);
	    }
	})
    }else{ // auth fail
	socket.emit("message",{
	    from,
	    at  :(new Date()).toString(),
	    message : "Please specify the room id you want to enter like https://...../index.html<span style=\"color:red\">?room=hoge&name=yourname</span>"
	});
	socket.disconnect();
    }
});