# -*- coding: utf-8 -*-

import datetime
import dateutil.parser
import dingguo
import email
import email.utils
import ioex
import re

def parse_order_confirmation_mail(mail):

    assert isinstance(mail, email.message.Message)

    text = mail.get_payload()[0].get_payload(decode = True).decode('utf-8').replace('\r\n', '\n')
    assert type(text) is unicode

    if not 'Lieferservice.at' in text:
        raise Exception('no lieferservice.at confirmation')
    msg_text = mail.get_payload()[0].get_payload(decode = True).decode('utf-8')

    order_match = re.search(
            ur'(Your order|Ihre Bestellung) \(.+\) (at|bei) (?P<restaurant>.*)\s+'
                + ur'(Your order reference is|Ihre Bestellnummer lautet): (?P<order_id>.*)\s+'
                + ur'[\W\w]+'
                + ur'(Your order|Ihre Bestellung)\s+'
                + ur'(?P<orders_text>[\W\w]+)'
                + ur'(Delivery costs|Lieferung):\s+(?P<delivery_costs>.*)\s+',
            text,
            re.UNICODE,
            )
    order_match_groups = order_match.groupdict()

    order = dingguo.Order(
        u'lieferservice.at',
        order_match_groups['order_id'].strip(),
        order_date = dateutil.parser.parse(mail['Date']),
        )

    restaurant = order_match_groups['restaurant'].strip('"')

    for article_match in re.finditer(
            ur'(?P<quantity>\d+)x\s'
                + ur'(?P<name>.*)\s'
                + ur'(?P<currency>.) (?P<price>-?\d+,\d+)\s',
            order_match_groups['orders_text'],
            re.UNICODE,
            ):
        article_match_groups = article_match.groupdict()
        quantity = int(article_match_groups['quantity'])
        assert quantity == 1
        name = re.sub(ur' +', ' ', article_match_groups['name'])
        price = dingguo.Sum(
            float(article_match_groups['price'].replace(',', '.')),
            article_match_groups['currency'],
            )
        if price.value < 0:
            price.value *= -1
            order.discounts.append(dingguo.Discount(
                name = name,
                amount = price,
                ))
        else:
            order.items.append(dingguo.Article(
                name = name,
                quantity = 1,
                price_brutto = price,
                reseller = restaurant,
                shipper = restaurant,
                ))

    delivery_costs = order_match_groups['delivery_costs'].strip()
    if delivery_costs in ['FREE', 'GRATIS']:
        order.items.append(dingguo.Item(
            name = u'Delivery',
            price_brutto = dingguo.Sum(0.0, u'EUR'),
            ))
    else:
        unit, value = delivery_costs.split(' ')
        order.items.append(dingguo.Item(
            name = u'Delivery',
            price_brutto = dingguo.Sum(float(value.replace(',', '.')), unit),
            ))

    return [order]