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from bs4 import BeautifulSoup
from django.utils import timezone

from edt.models import Group, Room, Course
from edt.utils import get_week

import datetime
import requests


class Week:
    def __init__(self, number, start):
        self.number = number
        self.start = timezone.make_aware(datetime.datetime.strptime(start, "%d/%m/%Y"))

    def get_day(self, id):
        return self.start + datetime.timedelta(id)

    @property
    def year(self):
        return self.start.year

def add_time(date, time):
    delta = datetime.timedelta(hours=time.hour, minutes=time.minute)
    return date + delta

def delete_courses_in_week(timetable, year, week):
    start, end = get_week(year, week)
    Course.objects.filter(begin__gte=start, begin__lt=end,
                          timetable=timetable).delete()

def get_from_db_or_create(cls, name, timetable=None):
    obj = cls.objects.all().filter(name=name)
    if timetable is not None:
        obj = obj.filter(timetable=timetable)

    obj = obj.first()
    if obj is None:
        obj = cls(name=name)
        obj.timetable = timetable
        obj.save()

    return obj

def get_events(soup, weeks, year, week, timetable):
    for event in soup.find_all("event"):
        title = None
        type_ = None
        groups = None
        rooms = None
        notes = None

        if weeks[event.rawweeks.text].number == week and \
           weeks[event.rawweeks.text].year == year and \
           event.resources.group is not None and \
           event.starttime is not None and event.endtime is not None:
            date = weeks[event.rawweeks.text].get_day(int(event.day.text))

            begin = add_time(date, datetime.datetime.strptime(
                event.starttime.text, "%H:%M"))
            end = add_time(date, datetime.datetime.strptime(
                event.endtime.text, "%H:%M"))

            groups = [get_from_db_or_create(Group, item.text, timetable)
                      for item in event.resources.group.find_all("item")]

            if event.notes is not None:
                notes = event.notes.text

            if event.resources.module is not None:
                title = event.resources.module.item.text
            elif notes is not None:
                title = notes
                notes = None
            else:
                title = "Aucune information"

            if event.category is not None:
                type_ = event.category.text

            if event.resources.room is not None:
                rooms = [get_from_db_or_create(Room, item.text)
                         for item in event.resources.room.find_all("item")]

            yield title, type_, groups, rooms, notes, begin, end

def get_weeks(soup):
    weeks = {}
    for span in soup.find_all("span"):
        weeks[span.alleventweeks.text] = Week(int(span.title.text), span["date"])

    return weeks

def get_xml(url):
    r = requests.get(url)
    r.encoding = "utf8"

    soup = BeautifulSoup(r.text, "html.parser")
    return soup