module Paperclip
  class VideoThumb < Processor

	attr_accessor :time_offset, :geometry, :whiny

	def initialize(file, options = {}, attachment = nil)
	  super
		@data = attachment
	  @time_offset = options[:time_offset] || '-4'
	  unless options[:geometry].nil? || (@geometry = Geometry.parse(options[:geometry])).nil?
			@geometry.width = (@geometry.width / 2.0).floor * 2.0
			@geometry.height = (@geometry.height / 2.0).floor * 2.0
			@geometry.modifier = ''
	  end
	  @whiny = options[:whiny].nil? ? true : options[:whiny]
	  @basename = File.basename(file.path, File.extname(file.path))
	end

	def make
	  dst = Tempfile.new([ @basename, 'jpg' ].compact.join("."))
	  dst.binmode

	  cmd = %Q[-itsoffset #{time_offset} -i "#{File.expand_path(file.path)}" -y -vcodec mjpeg -vframes 1 -an -f rawvideo ]
	  cmd << "-s #{geometry.to_s} " unless geometry.nil?
	  cmd << %Q["#{File.expand_path(dst.path)}"]

	  begin
			success = Paperclip.run('ffmpeg', cmd)
	  rescue PaperclipCommandLineError
			raise PaperclipError, "There was an error processing the thumbnail for #{@basename}" if whiny
	  end
	  dst
	end
  end
end