require 'peddler/error_parser'
require 'peddler/flat_file_parser'
require 'peddler/xml_response_parser'

module Peddler
  # @api private
  module Parser
    class << self
      # The inevitable-seeming messiness of massaging data produced by a motley
      # army of Amazon developers
      def new(res, encoding = 'ISO-8859-1')
        # Don't parse if there's no body
        return res unless res.body

        if xml?(res)
          XMLResponseParser.new(res)
        else
          # Amazon returns a variety of content types for flat files, so we
          # simply assume that anything not XML is a flat file rather than code
          # defensively and check content type again.
          FlatFileParser.new(res, encoding)
        end
      end

      def xml?(res)
        return true if res.headers['Content-Type'].start_with?('text/xml')
        return true if res.body.start_with?('<?xml')

        false
      end
    end
  end
end