# -*- 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.core.mail import send_mail
from django.core.urlresolvers import reverse
from django.db import transaction
from django.shortcuts import get_object_or_404, redirect, render
from django.template import loader
from django.template.context_processors import csrf
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _
from reversion import revisions as reversion

from med.settings import ASSO_EMAIL, ASSO_NAME, EMAIL_FROM, \
    REQ_EXPIRE_STR
from users.forms import BaseInfoForm
from users.forms import PassForm
from users.models import Adhesion, Request, User


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


def password_change_action(u_form, user, request, req=False):
    """ Fonction qui effectue le changeemnt de mdp bdd"""
    if u_form.cleaned_data['passwd1'] != u_form.cleaned_data['passwd2']:
        messages.error(request, "Les 2 mots de passe différent")
        return form({'userform': u_form}, 'users/user.html', request)
    user.set_password(u_form.cleaned_data['passwd1'])
    with transaction.atomic(), reversion.create_revision():
        user.save()
        reversion.set_comment("Réinitialisation du mot de passe")
    messages.success(request, "Le mot de passe a changé")
    if req:
        req.delete()
        return redirect("/")
    return redirect("/")


def reset_passwd_mail(req, request):
    """
    Envoie un mail de réinitialisation de mot de passe
    """
    t = loader.get_template('users/email_passwd_request')
    c = {
        'name': str(req.user.first_name) + ' ' + str(req.user.last_name),
        'asso': ASSO_NAME,
        'asso_mail': ASSO_EMAIL,
        'site_name': 'Mediatek',
        'url': request.build_absolute_uri(
            reverse('users:process', kwargs={'token': req.token})),
        'expire_in': REQ_EXPIRE_STR,
    }
    send_mail('Votre compte Mediatek', t.render(c),
              EMAIL_FROM, [req.user.email], fail_silently=False)
    return


@login_required
@permission_required('users.add_user')
def new_user(request):
    """
    Vue de création d'un nouvel utilisateur
    """
    user = BaseInfoForm(request.POST or None)
    if user.is_valid():
        user = user.save(commit=False)
        with transaction.atomic(), reversion.create_revision():
            user.save()
            reversion.set_comment("Création")
        req = Request()
        req.type = Request.PASSWD
        req.user = user
        req.save()
        reset_passwd_mail(req, request)
        messages.success(request,
                         "L'utilisateur %s a été crée, un mail pour "
                         "l'initialisation du mot de passe a été "
                         "envoyé" % user.username)
        return redirect("/")
    return form({
        'form': user,
        'title': _('New user'),
    }, 'users/user.html', request)


@login_required
def edit_info(request):
    """
    Edite son utilisateur
    """
    user = BaseInfoForm(request.POST or None, instance=request.user)
    if user.is_valid():
        with transaction.atomic(), reversion.create_revision():
            user.save()
            reversion.set_user(request.user)
            reversion.set_comment("Champs modifié(s) : %s" % ', '.join(
                field for field in user.changed_data))
        messages.success(request, "L'user a bien été modifié")
        return redirect("/")
    return form({
        'form': user,
        'password_change': True,
        'title': _('Edit user profile'),
    }, 'users/user.html', request)


@login_required
@permission_required('users.add_adhesion')
def adherer(request, userid):
    try:
        users = User.objects.get(pk=userid)
    except User.DoesNotExist:
        messages.error(request, "Utilisateur inexistant")
        return redirect("/")
    adh_year = Adhesion.objects.all().order_by('annee_debut').reverse().first()
    with transaction.atomic(), reversion.create_revision():
        reversion.set_user(request.user)
        adh_year.adherent.add(users)
        adh_year.save()
        reversion.set_comment("Adhesion de %s" % users)
    messages.success(request, "Adhesion effectuee")
    return redirect("/")


def process(request, token):
    valid_reqs = Request.objects.filter(expires_at__gt=timezone.now())
    req = get_object_or_404(valid_reqs, token=token)

    if req.type == Request.PASSWD:
        return process_passwd(request, req)
    else:
        messages.error(request, "Entrée incorrecte, contactez un admin")
        redirect("/")


def process_passwd(request, req):
    u_form = PassForm(request.POST or None)
    user = req.user
    if u_form.is_valid():
        return password_change_action(u_form, user, request, req=req)
    return form({'form': u_form}, 'users/user.html', request)