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#    Copyright (C) 2017-2018  Alban Gruin
#
#    celcatsanitizer is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published
#    by the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    celcatsanitizer is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with celcatsanitizer.  If not, see <http://www.gnu.org/licenses/>.

import datetime

from django.contrib.postgres.aggregates import ArrayAgg
from django.db import connection
from django.db.models import Count, Max
from django.db.models.expressions import RawSQL
from django.db.models.functions import ExtractWeek, ExtractYear, Length
from django.http import Http404
from django.shortcuts import get_object_or_404, render
from django.views.decorators.csrf import csrf_exempt

from .forms import QSJPSForm
from .models import Course, Group, Room, Timetable, Year
from .utils import get_current_week, get_current_or_next_week, get_week, group_courses

import edt

def index(request):
    years = Year.objects.order_by("name")
    return render(request, "index.html", {"elements": years})

def mention_list(request, year_slug):
    year = get_object_or_404(Year, slug=year_slug)
    timetables = Timetable.objects.order_by("name").filter(year=year)

    return render(request, "index.html", {"year": year, "elements": timetables})

def group_list(request, year_slug, timetable_slug):
    timetable = get_object_or_404(Timetable, year__slug=year_slug, slug=timetable_slug)

    start, _ = get_week(*get_current_week())
    end = start + datetime.timedelta(weeks=4)

    groups = Group.objects.get_relevant_groups(start, source=timetable.source, hidden=False)
    groups_weeks = Course.objects.get_weeks(begin__gte=start, begin__lt=end, groups__in=groups)

    for group in groups:
        for group_week in groups_weeks:
            if group.corresponds_to(group_week["groups__mention"],
                                    group_week["groups__semester"],
                                    group_week["groups__subgroup"]):
                if not hasattr(group, "weeks"):
                    group.weeks = []

                date, _ = get_week(group_week["year"], group_week["week"])
                if date not in group.weeks:
                    group.weeks.append(date)

        if hasattr(group, "weeks"):
            group.weeks.sort()

    return render(request, "group_list.html", {"timetable": timetable, "groups": groups})

def timetable_common(request, obj, year=None, week=None, timetable=None):
    current_year, current_week = get_current_or_next_week()
    is_old_timetable, provided_week = False, True

    if year is None or week is None:
        year, week = current_year, current_week
        provided_week = False
    elif (int(year), int(week)) < (current_year, current_week):
        is_old_timetable = True

    start, end = get_week(year, week)

    courses = Course.objects.get_courses(obj, begin__gte=start, begin__lt=end)
    if not courses.exists() and provided_week:
        raise Http404

    # Récupération des semaines suivantes et précédentes pour les
    # afficher proprement dans l’emploi du temps
    last_week = getattr(Course.objects.get_courses(obj, begin__lt=start).last(), "begin", None)
    next_week = getattr(Course.objects.get_courses(obj, begin__gte=end).first(), "begin", None)

    last_update = courses.aggregate(Max("last_update"))["last_update__max"]
    grouped_courses = group_courses(courses)

    return render(request, "timetable.html", {"group": obj, "courses": grouped_courses,
                                              "last_update": last_update,
                                              "year": year, "week": int(week),
                                              "last_week": last_week,
                                              "next_week": next_week,
                                              "is_old_timetable": is_old_timetable,
                                              "group_mode": isinstance(obj, Group),
                                              "timetable": timetable})

def timetable(request, year_slug, timetable_slug, group_slug, year=None, week=None):
    timetable = get_object_or_404(Timetable, year__slug=year_slug, slug=timetable_slug)
    group = get_object_or_404(Group, slug=group_slug, source=timetable.source)

    return timetable_common(request, group, year, week, timetable)

def calendars(request, year_slug, timetable_slug, group_slug):
    timetable = get_object_or_404(Timetable, year__slug=year_slug,
                                  slug=timetable_slug)
    group = get_object_or_404(Group, source=timetable.source, slug=group_slug)
    groups = Group.objects.get_parents(group).annotate(length=Length("subgroup")) \
                                             .order_by("length")

    return render(request, "calendars.html", {"timetable": timetable,
                                              "group": group, "groups": groups})

def rooms(request):
    # On récupère les dates allant de cette semaine à dans un mois
    start, _ = get_week(*get_current_week())
    end = start + datetime.timedelta(weeks=4)

    if connection.vendor == "postgresql":
        # Si le SGBD est PostgreSQL, on utilise une requête à base de
        # ArrayAgg. Elle présente l’avantage d’être plus rapide que la
        # requête « généraliste » et de ne pas nécessiter de
        # traitement après.  On récupère chaque salle ayant un cours
        # dans le mois à venir. Pour chacun de ses cours, on ne
        # récupère que le premier jour de la semaine, et si jamais ce
        # jour n’est pas déjà dans la liste des semaines de cours
        # (« weeks »), on l’y rajoute.
        rooms = Room.objects.filter(course__begin__gte=start,
                                    course__begin__lt=end) \
                            .order_by("name") \
                            .annotate(weeks=ArrayAgg(
                                RawSQL("date_trunc('week', edt_course.begin)",
                                       []), distinct=True))

        return render(request, "group_list.html", {"groups": rooms})

    # Récupération des salles et de toutes les semaines où elles sont
    # concernées.
    # Cette requête associe chaque salle à toutes les semaines où un
    # cours s’y déroule. Le résultat est trié par le nom de la salle
    # et par semaine.
    # TODO optimiser cette requête, elle me semble un peu lente
    rooms = Room.objects.filter(course__begin__gte=start, course__begin__lt=end) \
                        .order_by("name") \
                        .annotate(year=ExtractYear("course__begin"),
                                  week=ExtractWeek("course__begin"),
                                  c=Count("*"))

    # Regroupement des semaines dans une liste de chaque objet salle
    rooms_weeks = []
    for room in rooms:
        # Si on a pas traité de salle ou que la salle courante
        # dans le résultat de la requête est différente de la dernière
        # dans la liste des salles traitées
        if len(rooms_weeks) == 0 or rooms_weeks[-1].id != room.id:
            # On lui affecte un tableau et on l’ajoute dans
            # la liste des salles à traiter
            room.weeks = []
            rooms_weeks.append(room)

        # On récupère le premier jour de la semaine
        date, _ = get_week(room.year, room.week)
        # Et on le rajoute dans la liste des semaines de la salle.
        rooms_weeks[-1].weeks.append(date)

    # Rendu de la page.
    return render(request, "group_list.html", {"groups": rooms_weeks})

def room_timetable(request, room_slug, year=None, week=None):
    room = get_object_or_404(Room, slug=room_slug)
    return timetable_common(request, room, year, week)

@csrf_exempt
def qsjps(request):
    if request.method == "POST":
        # Si on traite un formulaire, on le valide
        form = QSJPSForm(request.POST)
        if form.is_valid():
            # Formulaire validé
            return render(request, "qsjps.html", {"rooms": [], "form": form})
        # Si le formulaire est invalide, on ré-affiche le formulaire
        # avec les erreurs
    else:
        # Si le formulaire n’a pas été soumis, on en instancie un
        # nouveau
        form = QSJPSForm()

    return render(request, "qsjps_form.html", {"form": form})

def ctx_processor(request):
    return {"celcatsanitizer_version": edt.VERSION}