require_relative 'convertible/heading'
require_relative 'convertible/parsing'
require_relative 'convertible/inputable'
module Eco::API::UseCases::GraphQL::Samples::Location::Service
  module TreeDiff
    # Offers a way to convert the values and keys/headers
    # of the input csv file/rows
    module Convertible
      class << self
        def included(base)
          super
          base.send :include, Inputable
        end
      end

      include Parsing
      include Heading

      private

      def input_csv
        @input_csv ||= Eco::CSV.read(input_file, encoding: input_encoding).then do |csv|
          next csv unless header_maps&.any?

          csv.transform_headers do |name|
            next name unless header_maps.key?(name)

            header_maps[name]
          end
        end.then do |csv|
          transform_input_csv(csv).tap do |res|
            next if res.is_a?(Eco::CSV::Table)

            msg = "Expecting and Eco::CSV::Table. Given: #{res.class}"
            raise ArgumentError, msg
          end
        end
      end
    end
  end
end