from .context import context_adaption
from django.shortcuts import render, redirect
from django.conf import settings
from django.contrib import messages
from django.contrib.auth import authenticate
from django.contrib.auth import login as django_login
from django.contrib.auth import logout as django_logout
from django.contrib.auth.decorators import login_required
from django.contrib.auth.forms import AuthenticationForm
from django.utils.translation import gettext as _
from .forms import UserRegistrationForm, UserProfileForm
import logging
from .models import get_userprofile
from themes import Context
import users
from users import parameter

try:
    from config import APP_NAME as ROOT_LOGGER_NAME
except ImportError:
    ROOT_LOGGER_NAME = 'root'
logger = logging.getLogger(ROOT_LOGGER_NAME).getChild(__name__)


def password_recovery(request):
    messages.error(request, "Password recovery is not yet implemented!")
    return redirect(request.GET.get('next') or '/')


def profile_post_actions(request, context):
    if request.POST:
        form = context.get('form_userprofile')
        if form.is_valid():
            form.save()
        return redirect(request.GET.get('next') or '/')


def profile_pre_actions(request, context, form_to_be_used=UserProfileForm):
    profile = get_userprofile(request.user)
    if request.POST:
        form = form_to_be_used(request.POST, instance=profile)
    else:
        form = form_to_be_used(instance=profile)
    context['form_userprofile'] = form


@login_required
def profile(request):
    context = Context(request)      # needs to be executed first because of time mesurement
    profile_pre_actions(request, context)
    response = profile_post_actions(request, context)
    if response is not None:
        return response
    else:
        context_adaption(
            context,
            request,
            _('Profile for %(username)s') % {'username': request.user.username},
        )
        return render(request, 'users/profile.html', context=context)


def register(request):
    context = Context(request)      # needs to be executed first because of time mesurement
    if parameter.get(parameter.USERS_SELF_REGISTRATION):
        context_adaption(context, request, _('Register'))
        if not request.POST:
            form = UserRegistrationForm()
            messages.info(request, _('If you already have an account, login <a href="%(url)s">here</a>.') % {'url': users.url_login(request)})
        else:
            form = UserRegistrationForm(request.POST)
            if form.is_valid():
                form.save()
                messages.success(request, _('Your account has been created! You are able to log in as %(username)s.') %
                                 {'username': form.cleaned_data.get('username')})
                return redirect('users-login')
            else:
                messages.error(request, _('Registration failed!'))
        context['form'] = form
        return render(request, 'users/register.html', context)
    else:
        messages.info(request, _("Self registration is deactivated. Contact your system administrator."))
        return redirect('users-login')


def login(request):
    context = Context(request)      # needs to be executed first because of time mesurement
    context_adaption(context, request, _('Login'))
    if not request.POST:
        form = AuthenticationForm()
        if parameter.get(parameter.USERS_SELF_REGISTRATION):
            messages.info(request, _('If you don\'t have an acount, register <a href="%(url)s">here</a>.') % {'url': users.url_register(request)})
    else:
        form = AuthenticationForm(request, data=request.POST)
        if form.is_valid():
            username = form.cleaned_data.get('username')
            user = authenticate(username=username, password=form.cleaned_data.get('password'))
            django_login(request, user)
            messages.success(request, _('You are now logged in as %(username)s.') % {'username': username})
            return redirect(request.GET.get('next') or '/')
        else:
            if parameter.get(parameter.USERS_SELF_REGISTRATION):
                messages.error(request, _('Login failed! You can do a password recorvery <a href="%(url_recover)s">here</a> or you can register <a href="%(url_register)s">here</a>.') %
                               {'url_register': users.url_register(request), 'url_recover': users.url_password_recovery(request)})
            else:
                messages.error(request, _('Login failed! You can do a password recorvery <a href="%(url_recover)s">here</a>.') %
                               {'url_recover': users.url_password_recovery(request)})

    context['form'] = form
    return render(request, 'users/login.html', context)


def logout(request):
    messages.success(request, _('You are no longer logged in as %(username)s.') % {'username': request.user.username})
    session_cache = {}
    try:
        for variable in settings.PERSISTENT_SESSION_VARIABLES:
            value = request.session.get(variable)
            if value is not None:
                session_cache[variable] = value
    except AttributeError:
        pass    # PERSISTENT_SESSION_VARIABLES are possibly not defined in the settings
    django_logout(request)
    for variable in session_cache:
        request.session[variable] = session_cache[variable]
    return redirect(request.GET.get('next') or '/')