module ActiveList
  module Exporters
    class AbstractExporter
      attr_reader :table, :generator

      def initialize(generator)
        @generator = generator
        @table = generator.table
      end

      def file_extension
        'txt'
      end

      def mime_type
        Mime::TEXT
      end

      def send_data_code
        fail NotImplementedError, "#{self.class.name}#format_data_code is not implemented."
      end

      def columns_headers(options = {})
        headers = []
        columns = table.exportable_columns
        for column in columns
          datum = column.header_code
          headers << (options[:encoding] ? datum + ".to_s.encode('#{options[:encoding]}', invalid: :replace, undef: :replace)" : datum)
        end
        headers
      end

      def columns_to_array(nature, options = {})
        columns = table.exportable_columns

        array = []
        record = options[:record] || 'record_of_the_death'
        for column in columns
          next unless column.is_a?(ActiveList::Definition::AbstractColumn)
          if nature == :header
            datum = column.header_code
          else
            datum = column.exporting_datum_code(record)
          end
          array << (options[:encoding] ? datum + ".to_s.encode('#{options[:encoding]}', invalid: :replace, undef: :replace)" : datum)
        end
        array
      end
    end
  end
end