#!/usr/bin/env node

/* eslint-disable no-process-exit */
"use strict";

var hlsdump = require('commander');
hlsdump.version('0.0.0')
   .usage('[options] <url>')
   .option('-o, --output <path>', 'target file')
   .option('-u, --udp [host:port]', 'relay TS over UDP', function(val) {
     var r = { host: 'localhost', port: 1234 };
     if (val) {
       var s = val.split(':');
       if (s.length === 1) {
         r.port = parseInt(s[0], 10);
       } else {
         r.host = s[0];
         r.port = parseInt(s[1], 10);
       }
     }
     return r;
   })
   .option('-b, --buffer-size <bytes>|full', 'try to buffer <bytes> of input data (implies -s)', function(val) {
     if (val === 'full') return 0x80000000 - 1;
     return parseInt(val, 0);
   })
   .option('-s, --sync', 'clock sync using stream PCR')
   .option('-f, --full-stream', 'fetch all stream data')
   .option('-c, --concurrent <count>', 'fetch using concurrent connections', parseInt)
   .option('-a, --user-agent <string>', 'HTTP User-Agent')
   .option('-i, --info-port <port>', 'report status using HTTP + json', parseInt)
   .option('--cookie <data>', 'add cookie header to key requests')
   .option('--key <hex>', 'use oob key for decrypting segments', function(opt) {return new Buffer(opt, 'hex');})
   .parse(process.argv);

var fs = require('fs'),
    http = require('http');

var oncemore = require('oncemore'),
    HlsSegmentReader = require('hls-segment-reader'),
    UdpBlast = require('udp-blast');
var HlsReader = require('../lib/hls-reader');

var src = hlsdump.args[0];
if (!src) {
  hlsdump.help();
  process.exit(-1);
}

if (hlsdump.bufferSize) hlsdump.sync = true;

var segmentReader = new HlsSegmentReader(src, { withData: true, highWaterMark: (hlsdump.concurrent || 1) - 1, fullStream: hlsdump.fullStream });
var r = new HlsReader(segmentReader, hlsdump);

segmentReader.once('index', function() {
  // wait until first index is returned before attaching error listener.
  // this will enable initials errors to throw
  segmentReader.on('error', function(err) {
    console.error('reader error', err.stack || err);
  });
});

if (hlsdump.udp) {
  var dst = (hlsdump.udp === true) ? null : hlsdump.udp;
  r.pipe(new UdpBlast(dst, { packetSize: 7 * 188 }));
}

if (hlsdump.output) {
  if (hlsdump.output === '-')
    r.pipe(process.stdout);
  else
    r.pipe(fs.createWriteStream(hlsdump.output));
}

var startTime = process.hrtime();
r.on('ready', function() {
  var delay = process.hrtime(startTime);
  console.error('"ready" after delay of ' + (delay[0] * 1e3 + delay[1] / 1e6).toFixed(2) + 'ms');
});

r.on('end', function() {
  console.error('stream complete');
})

var totalDuration = 0;
r.on('segment', function(segmentInfo) {
  var downloadSize = segmentInfo.file.size;
  var duration = segmentInfo.details.duration;
  totalDuration += duration;

  // calculate size when missing
  if (downloadSize === -1) {
    downloadSize = 0;
    segmentInfo.stream.on('data', function(chunk) {
      downloadSize += chunk.length;
    });
  }

  oncemore(segmentInfo.stream).once('close', 'end', 'error', function(/*err*/) {
    console.error('segment done at ' + totalDuration.toFixed(0) + ' seconds, avg bitrate (kbps):', (downloadSize / (duration * 1024 / 8)).toFixed(1));
  });
});

if (hlsdump.infoPort) {
  var stats = require('measured').createCollection();
  var currentSegment = -1;

  // setup stat tracking
  stats.gauge('bufferBytes', function() { return r.buffer._readableState.length/* + buffer._writableState.length*/; });
  stats.gauge('currentSegment', function() { return currentSegment; });
  stats.gauge('index.first', function() { return segmentReader.index ? segmentReader.index.first_seq_no : -1; });
  stats.gauge('index.last', function() { return segmentReader.index ? segmentReader.index.lastSeqNo() : -1; });
  stats.gauge('totalDuration', function() { return totalDuration; });

  stats.meter('streamErrors');

  r.on('segment', function(segmentInfo) {
    currentSegment = segmentInfo.seq;

    var stopwatch = stats.timer('fetchTime').start();
    oncemore(segmentInfo.stream).once('close', 'end', 'error', function(err) {
      stopwatch.end();
      if (err) stats.meter('streamErrors').mark();
    });
  });

  var server = http.createServer(function (req, res) {
    if (req.method === 'GET') {
      var data = JSON.stringify(stats, null, ' ');
      res.writeHead(200, {
        'Content-Type': 'application/json',
        'Content-Length': data.length
      });
      res.write(data);
    }
    res.end();
  }).listen(hlsdump.infoPort);

  oncemore(r).once('end', 'error', function(/*err*/) {
    server.close();
  });
}