class VideoProcessorJob < ApplicationJob
  queue_as :default

  def perform(video_id)
    video = Video.find(video_id)

    # Extract metadata
    metadata = VideoMetadataExtractor.new(video.full_file_path).extract
    video.update!(video_metadata: metadata)

    # Check if web compatible
    transcoder = VideoTranscoder.new
    web_compatible = transcoder.web_compatible?(video.full_file_path)
    video.update!(web_compatible: web_compatible)

    # Generate thumbnail
    generate_thumbnail(video)

    # Transcode if needed
    unless web_compatible
      transcode_video(video, transcoder)
    end

    video.update!(processed: true)
  rescue => e
    video.update!(processing_errors: e.message)
    raise
  end

  private

  def generate_thumbnail(video)
    transcoder = VideoTranscoder.new

    # Generate thumbnail at 10% of duration or 5 seconds if duration unknown
    thumbnail_time = video.duration ? video.duration * 0.1 : 5
    thumbnail_path = transcoder.extract_frame(video.full_file_path, thumbnail_time)

    # Attach thumbnail as video asset
    video.video_assets.create!(
      asset_type: 'thumbnail',
      file: File.open(thumbnail_path)
    )

    # Clean up temporary file
    File.delete(thumbnail_path) if File.exist?(thumbnail_path)
  end

  def transcode_video(video, transcoder)
    output_path = video.full_file_path.gsub(/\.[^.]+$/, '.web.mp4')

    transcoder.transcode_for_web(
      input_path: video.full_file_path,
      output_path: output_path
    )

    video.update!(
      transcoded_path: File.basename(output_path),
      transcoded_permanently: true,
      web_compatible: true
    )
  end
end