pulibrary / pdc_describe / 4e4e59fc-9df4-4838-9fd4-6c7ea33cdb7c

class FileRenameMappingService

  attr_reader :upload_snapshot, :files, :renamed_files, :original_filenames

  def initialize(upload_snapshot:)

    @upload_snapshot = upload_snapshot

    @original_filenames = @upload_snapshot.files.map { |a| a["filename"] }

    @files = parse_files_to_rename

    @renamed_files = rename_files

  end

  def parse_files_to_rename

    files = []

    @original_filenames.each do |original_filename|

      files << FileRenameService.new(filename: original_filename)

    end

    files

  end

  def rename_files

    @upload_snapshot.with_lock do

      @upload_snapshot.reload

      rename_index = 1

      renamed_files = {}

      @files.each do |file|

        next unless file.needs_rename?

        new_filename = file.new_filename(rename_index)

        renamed_files[file.original_filename] = new_filename

        @upload_snapshot.rename(file.original_filename, new_filename)

        rename_index += 1

      end

      @upload_snapshot.save

      renamed_files

    end

  end

  def rename_needed?

    @files.each do |file|

      return true if file.needs_rename?

    end

    false

  end

  def rename_date

    Time.zone.now.strftime("%d %b %Y")

  end

  def renaming_document

    message = "Some files have been renamed to comply with AWS S3 storage requirements\n"

    message += "Rename date: #{rename_date}\n"

    message += "Original Filename\t Renamed File\n"

    @files.each do |file|

      next unless file.needs_rename?

      message += "#{file.original_filename}\t#{@renamed_files[file.original_filename]}\n"

    end

    message

  end

end