const express = require('express');
const http = require('http');
const child_process = require('child_process');
const { URL } = require('url');
const io = require('socket.io');


const app = express();
const server = http.createServer(app).listen(8443, () => {
  console.log('Listening...');
});

// IceCast settings
const iceServerDomain =  'kurento.fishrungames.com';
const iceServerPort = '8000';

const wss = io(server);

/*
function ffmpegArgs(iceUrl) {
  args = [
    // FFmpeg will read input video from STDIN.
    '-i', '-',
    '-f', 'webm', 
    '-cluster_size_limit', '2M', '-cluster_time_limit', '5100', '-content_type', 'video/webm',
    // We should be getting video and audio from the browser using a format that icecast
    // can handle so we can just copy to save CPU cycles on the server. 
    '-vcodec', 'copy', '-acodec', 'copy',
    iceUrl + '.webm'
  ];
  return args;
}
*/

function ffmpegArgs(iceUrl) {
  args = [
    // FFmpeg will read input video from STDIN.
    '-i', '-',
    '-f', 'webm',
    '-cluster_size_limit', '2M', '-cluster_time_limit', '5100', '-content_type', 'video/webm',
    // We should be getting video and audio from the browser using a format that icecast
    // can handle so we can just copy to save CPU cycles on the server.
    '-vcodec', 'copy', '-acodec', 'copy',
    iceUrl + '.webm'
  ];
  return args;
}


wss.on('connection', (ws, req) => {

  console.log('connected ' + ws.id );

  ws.on('error', (e) => {
    console.log('websocket error' + e);
  });

    // Creds for IceCast
    const iceUser = 'source';
    const icePassword = 'frg$$frg';
    const iceMountPoint = 'qq';

    const iceUrl = 'icecast://' + iceUser + ':' + icePassword + '@' +
      iceServerDomain + ':' + iceServerPort + '/' + iceMountPoint;

    const ffmpeg = child_process.spawn('ffmpeg', ffmpegArgs(iceUrl));
    

    // If ffmpeg is crashing
    ffmpeg.on('close', (code, signal) => {
      console.log('FFmpeg child process closed, code ' + code + ', signal ' + signal);
      ws.disconnect();
      console.log('Disconnected ' + ws.id + 'because ffmpeg crashing');
    });
    

    ffmpeg.stdin.on('error', (e) => {
      console.log('FFmpeg STDIN Error: ' +  e);
    });

    ffmpeg.stderr.on('data', (data) => {
      //console.log('ffmpeg stderr');
      //console.log(data.toString());
    });

    // When new blob
    ws.on('blob', (msg) => {
      //console.log('blob')
      ffmpeg.stdin.write(msg);
    });
    
    // When client leave
    ws.on('close', (e) => {
      console.log('Closing connection ' + ws.id);
      ffmpeg.stdin.end();
      ffmpeg.kill();
    });

    // If user disconnect or somethink
    ws.on('disconnect', (e) => {
      console.log('Closing connection ' + ws.id);
     ffmpeg.stdin.end();
     ffmpeg.kill();
    });

});