class Transcode < XMorph::Base

  HIGH_DEFINITION = "HIGH_DEFINITION"
  STANDARD_DEFINITION = "STANDARD_DEFINITION"

  def set_profiles
    self.profiles = {
      HIGH_DEFINITION => "ffmpeg -y -i %{IN} -vf \"fps=fps=29.970000,scale=1920x1080,setdar=dar=16/9\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -vb 12000000 -minrate:v 12000000 -maxrate:v 12000000 -bufsize:v 24000000  -acodec libfdk_aac -profile:a aac_low -ab 192k -ar 48000 -map 0:v -map 0:a:0  -muxrate 13411200  -streamid 0:2064  -streamid 1:2068  -vsync 1 -async 1 %{OUT} 2>&1",
      STANDARD_DEFINITION => "ffmpeg -y -i %{IN}  -vf \"fps=fps=29.970000,scale=720x480,setdar=dar=4/3\" -pix_fmt yuv420p  -vcodec h264 -g 13 -bf 2 -x264opts nal-hrd=cbr -profile:v high -vb 8000000 -minrate:v 8000000 -maxrate:v 8000000 -bufsize:v 24000000 -acodec libfdk_aac -profile:a aac_low -ab 192k -ar 48000 -map 0:v -map 0:a:0  -muxrate 8600000  -streamid 0:2064  -streamid 1:2068  -vsync 1 -async 1 %{OUT} 2>&1"
    }
  end

  def video_checks
    {
      ALLOWED_ASPECT_RATIO => IGNORE,
      ALLOWED_HEIGHT => (360..1080),
      ALLOWED_WIDTH => (480..1280), 
      ALLOWED_FRAME_RATE => IGNORE,
      ALLOWED_VIDEO_BIT_RATE => IGNORE, #Mbps
      ALLOWED_SCAN_TYPE => IGNORE, #all downcased
    }
  end

  def audio_checks
    {
      PRESENCE_OF_AUDIO_TRACK => VALIDATE,
      ALLOWED_NUMBER_OF_AUDIO_TRACKS => [1],
      ALLOWED_AUDIO_CODECS => ["aac", "pcm", "mpeg audio"],
      ALLOWED_AUDIO_BIT_RATE => IGNORE,
      ALLOWED_NUMBER_OF_AUDIO_CHANNELS => [2],
    }
  end

  # Classification is based on Video Resoltion
  # HD Videos & 720P Videos are transcoded as 1920x1080 with 16:9 Aspect Ratio
  # SD Videos are transcoded as 720x480 with 4:3 Aspect Ratio
  # Aspect Ratio is forced as 16:9 & 4:3 for HD & SD respectively
  def set_profile_name
    self.profile_name = nil
    mediainfo = self.mediainfo_output
    video_info = mediainfo["Video"]
    aspect_ratio = video_info["Display_aspect_ratio"]
    height = (video_info["Original_height"] || video_info["Height"]).split("pixels")[0].gsub(/ /,"")
    width = (video_info["Original_width"] || video_info["Width"]).split("pixels")[0].gsub(/ /,"")

    XMorph::Base.logger.debug("XMorph#get_profile#shoutfactory: Got Aspect Ratio: #{aspect_ratio}, Height: #{height}, Width: #{width}")
    if height.present? and width.present?
      # HD assets
      if (width.to_i == 1920) and (height.to_i == 1080)
        self.profile_name = HIGH_DEFINITION
      # 720P assets are upscaled to HD asset
      elsif (width.to_i == 1280) and (height.to_i == 720)
        self.profile_name = HIGH_DEFINITION
      # Non HD & 720P assets are forced to SD
      elsif (width.to_i > 0) and (height.to_i > 0) and (width.to_i < 1920) and (height.to_i < 1080)
        self.profile_name = STANDARD_DEFINITION
      else
        self.error = "Got Unexpected Resolution #{width}x#{height}. No transcoding profile available for this."
        XMorph::Base.logger.debug("XMorph#get_profile#shoutfactory: Got something unexpected! No Transcoding profile is available for this.")
        return false
      end
      XMorph::Base.logger.debug("XMorph#get_profile#shoutfactory: Converting the file to #{self.profile_name}")
    else
      self.error = "Couldn't find Resolution of the Video correctly"
    end
    return true
  end
end