parser.rb

require 'minitest/autorun'
require 'pry'
require 'mail'
require 'nokogiri'

class MailParser
  class << self
    def parse_email(email_path)
      mail = Mail.read(email_path)
      html_body = mail.parts.last.body.raw_source
      body = Nokogiri::HTML(html_body)
      date = body.xpath('//p//span//span')[11].text.split(" ")[2]
      time_window = body.xpath('//p//span//span')[11].text.split(" ")[3]
      # TODO: Unescape Umlauts in Customer Name
      customer_name = body.xpath('//p//span//span')[12].children[2].text
      street_name = body.xpath('//p//span//span')[12].children[6].text
      zipcode = body.xpath('//p//span//span')[12].children[9].text
      total = body.xpath('//b//span').last.text

      return {
        date: date,
        time_window: time_window,
        customer_name: customer_name,
        street_name: street_name,
        zipcode: zipcode,
        order_total: total
      }
    end
  end
end

class MailParserTest < Minitest::Test
  def test_parser
    expected_result = { date: '23.01.17',
                        time_window: '19:00-19:30',
                        customer_name: 'Christine Mika',
                        street_name: 'Bürglistrasse 26',
                        zipcode: '8002',
                        order_total: '53,00' }

    assert_equal expected_result, MailParser.parse_email('email.eml')
  end
end