# -*- coding: utf-8 -*-
import re
import random
import datetime
from django.db import connection

def get_client_ip(request):
    x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
    if x_forwarded_for:
        ip = x_forwarded_for.split(',')[0]
    else:
        ip = request.META.get('REMOTE_ADDR')
    return ip

def get_referer_view(request, default=None):
    '''
    Return the referer view of the current request

    Example:

        def some_view(request):
            ...
            referer_view = get_referer_view(request)
            return HttpResponseRedirect(referer_view, '/accounts/login/')
    '''

    # if the user typed the url directly in the browser's address bar
    referer = request.META.get('HTTP_REFERER')
    if not referer:
        return default

    # remove the protocol and split the url at the slashes
    referer = re.sub('^https?:\/\/', '', referer).split('/')
    if referer[0] != request.META.get('SERVER_NAME'):
        return default

    # add the slash at the relative path's view and finished
    referer = u'/' + u'/'.join(referer[1:])
    return referer

def get_by_sort(banner_list):
    max_sort = 0
    for banner in banner_list:
        sort = banner.sort
        if sort > max_sort:
            max_sort = sort
    result = [banner for banner in banner_list if banner.sort == max_sort]
    return result

def set_cookie(response, key, value, days_expire = 7):
    if days_expire is None:
        max_age = 365 * 24 * 60 * 60  #one year
    else:
        max_age = days_expire * 24 * 60 * 60
        expires = datetime.datetime.strftime(datetime.datetime.utcnow() + datetime.timedelta(seconds=max_age), "%a, %d-%b-%Y %H:%M:%S GMT")
    response.set_cookie(key, value, max_age=max_age, expires=expires)
    return response


def get_banner_by_params(banners_list, urls,  params, request):
    thematic_banners = []
    url_banners = []

    for banner in banners_list:
        # check popups
        if banner.popup:
            cookie = request.COOKIES.get(banner.cookie)
            if cookie:
                continue
        # check by theme
        banner_theme_ids = [str(theme.id) for theme in banner.theme.all()]
        if banner_theme_ids:
            if params.get('theme'):
                theme = params['theme']

                flag = False
                for th in theme:
                    if th in banner_theme_ids:
                        flag = True
                if flag:
                    thematic_banners.append(banner)
                    continue
        # check by country
        banner_country_ids = [str(country.id) for country in banner.country.all()]
        #print('number of queries = %d'%len(connection.queries))
        if banner_country_ids:
            if params.get('country'):

                country = params['country']
                if country in banner_country_ids:
                    thematic_banners.append(banner)
                    continue

        # check by url
        if urls:
            banner_urls = banner.urls.all()
            print('number of queries = %d'%len(connection.queries))

            if banner_urls:

                banner_urls = set(banner_urls)
                common_urls = set(urls).intersection(banner_urls)

                if common_urls:
                    url_banners.append(banner)
                    continue

    if thematic_banners:
        result = thematic_banners
    elif url_banners:
        result = url_banners
    else:
        result = []
    if result:
        sort_result = get_by_sort(result)
        # return random.choice(sort_result)
        return random_choice_banners(sort_result)
    else:
        return None


def random_choice_banners(banners):
    '''
    Include weight of customers model.
    '''
    choice_from = {}
    for i, banner in enumerate(banners):
        key = 'customer{pk}'.format(pk=banner.customer_id) if banner.customer_id else i
        choice_from.setdefault(key, []).append(banner)
    pre_choiced = random.choice(choice_from.values())
    return random.choice(pre_choiced)


def get_top_events(tops, params, request):
    catalog = params.get('catalog')
    country = params.get('country', '')
    theme = params.get('theme', [])
    city = params.get('city', '')
    tag = params.get('tag', '')
    month = params.get('month', '')
    year = request.GET.get('year', '')
    catalog_tops = [item for item in tops if item.catalog == catalog]
    good_tops = []
    for top in catalog_tops:

        country_ids = [str(item.id) for item in top.country.all()]
        theme_ids = [str(item.id) for item in top.theme.all()]
        city_ids = [str(item.id) for item in top.cities.all()]
        excluded_tags_ids = [str(item.id) for item in top.excluded_tags.all()]
        excluded_cities_ids = [str(item.id) for item in top.excluded_cities.all()]
        if not any([country_ids, theme_ids, city_ids]):
            # universal top
            good_tops.append(top)
            continue
        # check country
        if country in country_ids and city not in excluded_cities_ids :
            good_tops.append(top)
            continue
        # check city
        if all([city, city in city_ids, not theme]):
            # check for top of month or top of year
            if (month and not month in top.months) or (not month and year and year != str(top.years)):
                continue
            good_tops.append(top)
            continue
        # check theme
        if tag in excluded_tags_ids:
            continue
        flag = False
        for th in theme:
            if th in theme_ids:
                flag = True
                continue
        if flag:
            good_tops.append(top)
    sorted_top = sorted(good_tops, key=lambda x: x.position)
    events = []
    for top in sorted_top:
        event = top.get_event()
        if event:
            top.link.log(request, 1)
            events.append(event)
    return events