# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2017  Gabriel Détraz
# Copyright © 2017  Goulven Kermarec
# Copyright © 2017  Augustin Lemesle
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# App de gestion des machines pour re2o
# Gabriel Détraz, Augustin Lemesle
# Gplv2
"""
Vue d'affichage, et de modification des réglages (réglages machine,
topologie, users, service...)
"""

from __future__ import unicode_literals

from django.urls import reverse
from django.shortcuts import render, redirect
from django.contrib import messages
from django.contrib.auth.decorators import login_required, permission_required
from django.db.models import ProtectedError
from django.db import transaction

from reversion.models import Version
from reversion import revisions as reversion

from re2o.views import form
from re2o.acl import can_create, can_edit, can_delete_set, can_view_all
from .forms import ServiceForm, DelServiceForm
from .models import Service, OptionalUser, OptionalMachine, AssoOption
from .models import MailMessageOption, GeneralOption, OptionalTopologie
from . import models
from . import forms


@login_required
@can_view_all(OptionalUser)
@can_view_all(OptionalMachine)
@can_view_all(OptionalTopologie)
@can_view_all(GeneralOption)
@can_view_all(AssoOption)
@can_view_all(MailMessageOption)
def display_options(request):
    """Vue pour affichage des options (en vrac) classé selon les models
    correspondants dans un tableau"""
    useroptions, _created = OptionalUser.objects.get_or_create()
    machineoptions, _created = OptionalMachine.objects.get_or_create()
    topologieoptions, _created = OptionalTopologie.objects.get_or_create()
    generaloptions, _created = GeneralOption.objects.get_or_create()
    assooptions, _created = AssoOption.objects.get_or_create()
    mailmessageoptions, _created = MailMessageOption.objects.get_or_create()
    service_list = Service.objects.all()
    return form({
        'useroptions': useroptions,
        'machineoptions': machineoptions,
        'topologieoptions': topologieoptions,
        'generaloptions': generaloptions,
        'assooptions': assooptions,
        'mailmessageoptions': mailmessageoptions,
        'service_list': service_list
        }, 'preferences/display_preferences.html', request)


@login_required
def edit_options(request, section):
    """ Edition des préférences générales"""
    model = getattr(models, section, None)
    form_instance = getattr(forms, 'Edit' + section + 'Form', None)
    if not (model or form_instance):
        messages.error(request, "Objet  inconnu")
        return redirect(reverse('preferences:display-options'))

    options_instance, _created = model.objects.get_or_create()
    can, msg = options_instance.can_edit(request.user)
    if not can:
        messages.error(request, msg or "Vous ne pouvez pas éditer cette\
                   option.")
        return redirect(reverse('index'))
    options = form_instance(
        request.POST or None,
        request.FILES or None,
        instance=options_instance
    )
    if options.is_valid():
        with transaction.atomic(), reversion.create_revision():
            options.save()
            reversion.set_user(request.user)
            reversion.set_comment(
                "Champs modifié(s) : %s" % ', '.join(
                    field for field in options.changed_data
                )
            )
            messages.success(request, "Préférences modifiées")
        return redirect(reverse('preferences:display-options'))
    return form(
        {'options': options},
        'preferences/edit_preferences.html',
        request
    )


@login_required
@can_create(Service)
def add_service(request):
    """Ajout d'un service de la page d'accueil"""
    service = ServiceForm(request.POST or None)
    if service.is_valid():
        with transaction.atomic(), reversion.create_revision():
            service.save()
            reversion.set_user(request.user)
            reversion.set_comment("Création")
        messages.success(request, "Ce service a été ajouté")
        return redirect(reverse('preferences:display-options'))
    return form(
        {'preferenceform': service, 'action_name' : 'Ajouter'},
        'preferences/preferences.html',
        request
        )


@login_required
@can_edit(Service)
def edit_service(request, service_instance, serviceid):
    """Edition des services affichés sur la page d'accueil"""
    service = ServiceForm(request.POST or None, instance=service_instance)
    if service.is_valid():
        with transaction.atomic(), reversion.create_revision():
            service.save()
            reversion.set_user(request.user)
            reversion.set_comment(
                "Champs modifié(s) : %s" % ', '.join(
                    field for field in service.changed_data
                    )
            )
        messages.success(request, "Service modifié")
        return redirect(reverse('preferences:display-options'))
    return form(
        {'preferenceform': service, 'action_name' : 'Editer'},
        'preferences/preferences.html',
        request
    )


@login_required
@can_delete_set(Service)
def del_services(request, instances):
    """Suppression d'un service de la page d'accueil"""
    services = DelServiceForm(request.POST or None, instances=instances)
    if services.is_valid():
        services_dels = services.cleaned_data['services']
        for services_del in services_dels:
            try:
                with transaction.atomic(), reversion.create_revision():
                    services_del.delete()
                    reversion.set_user(request.user)
                messages.success(request, "Le service a été supprimée")
            except ProtectedError:
                messages.error(request, "Erreur le service\
                suivant %s ne peut être supprimé" % services_del)
        return redirect(reverse('preferences:display-options'))
    return form(
        {'preferenceform': services, 'action_name' : 'Supprimer'},
        'preferences/preferences.html',
        request
    )