require 'json'
require 'resque'
require 'resque-retry'
require 'net/http'
require 'digest/md5'

module JamRuby
  class JamTracksBuilder
    extend JamRuby::ResqueStats

    @queue = :jam_tracks_builder

    def log
      @log || Logging.logger[JamTracksBuilder]
    end

    attr_accessor :jam_track_right_id

    def self.perform(jam_track_right_id)
      jam_track_builder = JamTracksBuilder.new()
      jam_track_builder.jam_track_right_id = jam_track_right_id
      jam_track_builder.run
    end

    def run
      begin
        log.info("jam_track_builder job starting. jam_track_right_id #{jam_track_right_id}")

        begin
          @jam_track_right = JamTrackRight.find(jam_track_right_id)

          # bailout check
          if @jam_track_right.signed
            log.debug("package is already signed. bailing")
            return
          end

          # track that it's started ( and avoid db validations )
          JamTrackRight.where(:id => @jam_track_right.id).update_all(:signing_started_at => Time.now, :should_retry => false)

          JamRuby::JamTracksManager.save_jam_track_right_jkz(@jam_track_right)

          length = @jam_track_right.url.size()
          md5 = Digest::MD5.new

          @jam_track_right.finish_sign(length, md5.to_s)

          log.info "Signed jamtrack to #{@jam_track_right[:url]}"

        rescue Exception => e
          # record the error in the database
          post_error(e)
          # and let the job fail, alerting ops too
          raise
        end
      end
    end

    # set @error_reason before you raise an exception, and it will be sent back as the error reason
    # otherwise, the error_reason will be unhandled-job-exception
    def post_error(e)
      begin
        # if error_reason is null, assume this is an unhandled error
        unless @error_reason
          @error_reason = "unhandled-job-exception"
          @error_detail = e.to_s
        end
        @jam_track_right.finish_errored(@error_reason, @error_detail)

      rescue Exception => e
        log.error "unable to post back to the database the error #{e}"
      end
    end
  end
end