module Astrails
  module Safe
    class Local < Sink

      protected

      def active?
        # S3 can't upload from pipe. it needs to know file size, so we must pass through :local
        # will change once we add SSH/FTP sink
        true
      end

      def prefix
        @prefix ||= File.expand_path(expand(@config[:local, :path] || raise(RuntimeError, "missing :local/:path")))
      end

      def save
        puts "command: #{@backup.command}" if $_VERBOSE

        unless $DRY_RUN
          FileUtils.mkdir_p(prefix) unless File.directory?(prefix)
          system "#{@backup.command}>#{@backup.path = path}"
        end

      end

      def cleanup
        return unless keep = @config[:keep, :local]

        base = File.basename(@backup.filename).split(".").first

        pattern = File.join(prefix, "#{base}*")
        puts "listing files #{pattern.inspect}" if $_VERBOSE
        files = Dir[pattern] .
          select{|f| File.file?(f) && File.size(f) > 0} .
          sort

        cleanup_with_limit(files, keep) do |f|
          puts "removing local file #{f}" if $DRY_RUN || $_VERBOSE
          File.unlink(f) unless $DRY_RUN
        end
      end
    end
  end
end