Get a youtube video information from get_video_info.

getYoutubeVideoInfo.coffee

request = require 'request'

youTubeMovieInfo = 
  youTubeMovieId: 'videoId'

url = "http://www.youtube.com/get_video_info?video_id=#{youTubeMovieInfo.youTubeMovieId}"
request.get url, (err, res, body) ->
  return callback(false)  if err
  return callback(false)  if res.statusCode isnt 200

  formats = parseYoutubeInfoStringToFormats(body)
  return callback(false)  if formats is null

  mp4StreamUrl = getMp4StreamUrlFromFormats(formats)
  youTubeMovieInfo.mp4StreamUrl = mp4StreamUrl


# parse youtube api json response.
parseYoutubeInfoStringToFormats = (youtubeInfoString) -> 
  youtubeInfoArray = youtubeInfoString.split '&'
  
  return null if youtubeInfoArray[0] is 'status=fail'
  
  formatStreamArrayString = (element for element in youtubeInfoArray when element.split('=')[0] is 'url_encoded_fmt_stream_map')[0].split('=')[1]
  formatStreamArray = decodeURIComponent(formatStreamArrayString).split(',')
  
  formats = []
  for formatStreamString in formatStreamArray
    formatInfoArray = formatStreamString.split '&'
    
    formatInfoMap = {}
    for formatInfoElement in formatInfoArray
      formatInfoElementPair = formatInfoElement.split '='
      formatInfoMap[formatInfoElementPair[0]] = decodeURIComponent(formatInfoElementPair[1])
      
    formats.push formatInfoMap
    
  return formats
  

# find mp4 stream url from parsed data.
getMp4StreamUrlFromFormats = (formats) ->
  return format.url for format in formats when format.itag is '18'

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