#!/usr/bin/env node

"use strict";

var hlsmon = require('commander');
hlsmon.version('0.0.0')
   .usage('[options] <url>')
   .option('-a', '--user-agent <string>', 'User-Agent')
   .parse(process.argv);

var url = require('url');

var HlsSegmentReader = require('hls-segment-reader');

var src = process.argv[2];
var sep = ';';

function monitor(srcUrl) {
  var r = new HlsSegmentReader(srcUrl, { fullStream:true, withData:false });

  var contentBytes = function (segmentInfo) {

    if (segmentInfo.type === 'segment') {
      return segmentInfo.segment.details.byterange ? +segmentInfo.segment.details.byterange.length : segmentInfo.file.size;
    }

    if (segmentInfo.type === 'init') {
      return segmentInfo.init.byterange ? parseInt(segmentInfo.init.quotedString('byterange'), 10): segmentInfo.file.size;
    }

    return segmentInfo.file.size;
  };

  var time = 0;
  r.on('data', function (segmentInfo) {
    var meta = segmentInfo.file;
    var size = contentBytes(segmentInfo);
    var duration = +(segmentInfo.segment && segmentInfo.segment.details.duration);
    console.log(meta.modified.toJSON() + sep + size + sep + duration.toFixed(3) + sep + (size / (duration * 1024 / 8)).toFixed(3));
    time += duration;
  });

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

  r.on('end', function() {
    if (r.index && r.index.master) {
      var newUrl = url.resolve(r.baseUrl, r.index.variants[0].uri);
      console.error('found variant index, using: ', newUrl);
      return monitor(newUrl);
    }
    console.error('done');
  });
}

monitor(src);