require 'csv'

module ErrandBoy
  class CSV
    class Base
      def initialize(request)
        @request = request
      end

      def push
        write_header unless File.exist?(path)
        File.open path, 'a' do |f|
          f.puts values
        end
      end

      def include?(key, value)
        ::CSV.table(path).by_col[key].include?(value)
      end

      def path
        File.join CSV.dir, filename
      end

      def filename
        "#{@request.provider}_#{@request.action}.csv"
      end

      def headers
        raise NotImplementedError, 'Subclass must implement this method!'
      end

      def values
        raise NotImplementedError, 'Subclass must implement this method!'
      end

      private

      def write_header
        File.write path, headers
      rescue Errno::ENOENT
        Dir.mkdir CSV.dir
        retry
      end
    end
  end
end