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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from django.http import HttpResponseRedirect
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from django.shortcuts import render_to_response
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from django.template import RequestContext
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from django.contrib import messages
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from django.utils.translation import ugettext as _
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from django.views.decorators.csrf import csrf_exempt
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from django.views.decorators.http import require_http_methods
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from django.core.urlresolvers import reverse
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from django.contrib.auth.decorators import login_required
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from astakos.im.util import prepare_response, get_query
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from astakos.im.views import requires_anonymous, signed_terms_required
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from astakos.im.models import PendingThirdPartyUser
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from astakos.im.forms import LoginForm, ExtendedPasswordChangeForm, \
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                             ExtendedSetPasswordForm
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from astakos.im.settings import (RATELIMIT_RETRIES_ALLOWED,
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                                ENABLE_LOCAL_ACCOUNT_MIGRATION)
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import astakos.im.messages as astakos_messages
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from astakos.im.views import requires_auth_provider
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from astakos.im import settings
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from ratelimit.decorators import ratelimit
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retries = RATELIMIT_RETRIES_ALLOWED - 1
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rate = str(retries) + '/m'
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@requires_auth_provider('local', login=True)
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@require_http_methods(["GET", "POST"])
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@csrf_exempt
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@requires_anonymous
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@ratelimit(field='username', method='POST', rate=rate)
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def login(request, on_failure='im/login.html'):
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    """
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    on_failure: the template name to render on login failure
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    """
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    was_limited = getattr(request, 'limited', False)
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    form = LoginForm(data=request.POST,
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                     was_limited=was_limited,
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                     request=request)
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    next = get_query(request).get('next', '')
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    third_party_token = get_query(request).get('key', False)
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    if not form.is_valid():
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        if third_party_token:
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            messages.info(request, astakos_messages.AUTH_PROVIDER_LOGIN_TO_ADD)
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        return render_to_response(
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            on_failure,
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            {'login_form':form,
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             'next':next,
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             'key': third_party_token},
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            context_instance=RequestContext(request))
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    # get the user from the cache
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    user = form.user_cache
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    message = None
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    if not user:
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        message = _(astakos_messages.ACCOUNT_AUTHENTICATION_FAILED)
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    elif not user.is_active:
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        message = user.get_inactive_message()
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    elif not user.can_login_with_auth_provider('local'):
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        # valid user logged in with no auth providers set, add local provider
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        # and let him log in
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        if user.auth_providers.count() == 0:
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            user.add_auth_provider('local')
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        else:
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            message = _(astakos_messages.NO_LOCAL_AUTH)
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    if message:
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        messages.error(request, message)
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        return render_to_response(on_failure,
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                                  {'login_form': form},
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                                  context_instance=RequestContext(request))
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    response = prepare_response(request, user, next)
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    if third_party_token:
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        # use requests to assign the account he just authenticated with with
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        # a third party provider account
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        try:
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            request.user.add_pending_auth_provider(third_party_token)
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            messages.success(request, _(astakos_messages.AUTH_PROVIDER_ADDED))
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        except PendingThirdPartyUser.DoesNotExist:
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            messages.error(request, _(astakos_messages.AUTH_PROVIDER_ADD_FAILED))
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    messages.success(request, _(astakos_messages.LOGIN_SUCCESS))
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    response.set_cookie('astakos_last_login_method', 'local')
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    return response
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@require_http_methods(["GET"])
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def password_reset_done(request, *args, **kwargs):
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    messages.success(request, _(astakos_messages.PASSWORD_RESET_DONE))
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    return HttpResponseRedirect(reverse('index'))
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@require_http_methods(["GET"])
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def password_reset_confirm_done(request, *args, **kwargs):
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    messages.success(request, _(astakos_messages.PASSWORD_RESET_CONFIRM_DONE))
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    return HttpResponseRedirect(reverse('index'))
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@require_http_methods(["GET", "POST"])
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@signed_terms_required
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@login_required
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@requires_auth_provider('local', login=True)
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def password_change(request, template_name='registration/password_change_form.html',
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                    post_change_redirect=None, password_change_form=ExtendedPasswordChangeForm):
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    create_password = False
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    # no local backend user wants to create a password
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    if not request.user.has_auth_provider('local'):
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        create_password = True
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        password_change_form = ExtendedSetPasswordForm
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    if post_change_redirect is None:
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        post_change_redirect = reverse('edit_profile')
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    if request.method == "POST":
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        form_kwargs = dict(
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            user=request.user,
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            data=request.POST,
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        )
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        if not create_password:
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            form_kwargs['session_key'] = session_key=request.session.session_key
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        form = password_change_form(**form_kwargs)
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        if form.is_valid():
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            form.save()
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            return HttpResponseRedirect(post_change_redirect)
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    else:
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        form = password_change_form(user=request.user)
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    return render_to_response(template_name, {
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        'form': form,
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    }, context_instance=RequestContext(request))
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