account_information_request_file.rb

module ProgramManagerBatchInterface
  module Models
    # Used to build the CSV files that are sent to the Program Manager to request
    # Account Information on a given subset of their account base.
    #
    # Files look like the following:
    #   pseudo_dda, updated_at, status
    #   12345,      2011-01-01 00:00:00, applicant
    #
    # To use:
    #   f = AccountInformationRequestFile.new
    #   f << { :pseudo_dda => '12345', :updated_at => Time.parse('2011-01-01 00:00:00'), :status => 'applicant' }
    #   f.generate_file # outputs guid, writes file at File.join(ProgramManagerBatchInterface.local_base_dir, 'account_information_request_files', "#{guid}.csv"
    #
    #   f.path # outputs path to file
    #   f.guid # guid set at initialization
    class AccountInformationRequestFile
      extend Forwardable
      attr_accessor :guid, :rows
      def_delegators :rows, :<<

      def initialize
        self.guid = UUIDTools::UUID.random_create.hexdigest
        self.rows = []
      end

      def base_directory
        File.join(ProgramManagerBatchInterface.local_base_dir, 'account_information_request_files')
      end

      def path
        File.join(base_directory, "#{guid}.csv")
      end

      def headers
        ['pseudo_dda', 'updated_at', 'status']
      end

      def ensure_directory
        unless File.directory?(base_directory)
          FileUtils.mkdir_p(base_directory)
        end
      end

      def generate_file
        ensure_directory
        CSV.open(path, 'wb') do |csv|
          csv << headers
          rows.each do |r|
            csv << [r[:pseudo_dda], r[:updated_at], r[:status]]
          end
        end
        guid
      end
    end
  end
end