# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2017-2019 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later

from django.contrib import messages
from django.contrib.auth.decorators import login_required, permission_required
from django.db import transaction
from django.shortcuts import render, redirect
from django.template.context_processors import csrf
from django.utils import timezone
from reversion import revisions as reversion

from users.models import User
from .forms import EmpruntForm
from .models import Emprunt


def form(ctx, template, request):
    c = ctx
    c.update(csrf(request))
    return render(request, template, c)


@login_required
@permission_required('media.add_emprunt')
def add_emprunt(request, userid):
    try:
        user = User.objects.get(pk=userid)
    except User.DoesNotExist:
        messages.error(request, u"Entrée inexistante")
        return redirect("/media/index_emprunts/")
    emprunts_en_cours = Emprunt.objects.filter(date_rendu=None,
                                               user=user).count()
    if emprunts_en_cours >= user.maxemprunt:
        messages.error(request,
                       "Maximum d'emprunts atteint de l'user %s" % user.maxemprunt)
        return redirect("/media/index_emprunts/")
    emprunt = EmpruntForm(request.POST or None)
    if emprunt.is_valid():
        emprunt = emprunt.save(commit=False)
        emprunt.user = user
        emprunt.permanencier_emprunt = request.user
        emprunt.date_emprunt = timezone.now()
        with transaction.atomic(), reversion.create_revision():
            emprunt.save()
            reversion.set_user(request.user)
            reversion.set_comment("Création")
        messages.success(request, "Le emprunt a été ajouté")
        return redirect("/media/index_emprunts/")
    return form({'form': emprunt}, 'media/media.html', request)


@login_required
@permission_required('media.change_emprunt')
def retour_emprunt(request, empruntid):
    try:
        emprunt_instance = Emprunt.objects.get(pk=empruntid)
    except Emprunt.DoesNotExist:
        messages.error(request, u"Entrée inexistante")
        return redirect("/media/index_emprunts/")
    with transaction.atomic(), reversion.create_revision():
        emprunt_instance.permanencier_rendu = request.user
        emprunt_instance.date_rendu = timezone.now()
        emprunt_instance.save()
        reversion.set_user(request.user)
        messages.success(request, "Retour enregistré")
    return redirect("/media/index_emprunts/")


def index(request):
    """
    Home page with user's borrowed items
    """
    if request.user.is_authenticated:
        borrowed_items = Emprunt.objects.filter(user=request.user)
    else:
        borrowed_items = []

    return render(request, 'media/index.html', {
        'borrowed_items': borrowed_items,
    })