import logging
from django.contrib import messages
from django.contrib.auth import views as auth_views, get_user_model
from django.urls import reverse_lazy
from django.utils.translation import ugettext as _
from django.views import generic

from .. import emails
from .. import forms

logger = logging.getLogger(__name__)


class LoginView(auth_views.LoginView):
    form_class = forms.auth.LoginForm
    next_page = reverse_lazy('dav_events:event_list')
    template_name = 'dav_events/auth/login_form.html'

    def get_success_url(self):
        url = self.get_redirect_url()
        return url or self.next_page

    def form_valid(self, form):
        r = super(LoginView, self).form_valid(form)
        messages.success(self.request, _(u'Benutzer angemeldet: %(username)s') % {'username': form.get_user()})
        return r


class LogoutView(auth_views.LogoutView):
    next_page = reverse_lazy('dav_events:home')

    def dispatch(self, request, *args, **kwargs):
        r = super(LogoutView, self).dispatch(request, *args, **kwargs)
        messages.success(self.request, _(u'Benutzer abgemeldet.'))
        return r


class SetPasswordView(auth_views.PasswordChangeView):
    form_class = forms.auth.SetPasswordForm
    template_name = 'dav_events/auth/set_password_form.html'
    success_url = reverse_lazy('dav_events:event_list')

    def form_valid(self, form):
        r = super(SetPasswordView, self).form_valid(form)
        messages.success(self.request, _(u'Passwort gespeichert.'))
        if form.cleaned_data.get('send_password_mail', False):
            email = emails.PasswordSetEmail(self.request.user, form.cleaned_data['new_password'])
            email.send()
        return r


class ResetPasswordView(generic.FormView):
    form_class = forms.auth.ResetPasswordForm
    template_name = 'dav_events/auth/reset_password_form.html'
    success_url = reverse_lazy('dav_events:login')

    def form_valid(self, form):
        username = form.cleaned_data.get('username')
        user_model = get_user_model()
        try:
            user = user_model.objects.get(username=username)
            random_password = user_model.objects.make_random_password(length=12)
            user.set_password(random_password)
            user.save()
            email = emails.PasswordSetEmail(user, random_password)
            email.send()
            messages.success(self.request, _(u'Neues Passwort versendet.'))
            logger.info('Password reset for user \'%s\'', username)
        except user_model.DoesNotExist:
            logger.warning('Password reset for unknown user \'%s\'', username)

        return super(ResetPasswordView, self).form_valid(form)