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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 HttpResponseBadRequest
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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.auth import authenticate
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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 astakos.im.util import prepare_response, get_query
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from astakos.im.views import requires_anonymous
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from astakos.im.models import AstakosUser
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from astakos.im.forms import LoginForm
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from astakos.im.settings import RATELIMIT_RETRIES_ALLOWED
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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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@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, was_limited=was_limited, request=request)
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    next = get_query(request).get('next', '')
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    if not form.is_valid():
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        return render_to_response(on_failure,
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                                  {'login_form':form,
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                                   'next':next},
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                                  context_instance=RequestContext(request))
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    # get the user from the cash
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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 = _('Cannot authenticate account')
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    elif not user.is_active:
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        message = _('Inactive account')
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    if message:
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        messages.add_message(request, messages.ERROR, message)
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        return render_to_response(on_failure,
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                                  {'form':form},
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                                  context_instance=RequestContext(request))
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    return prepare_response(request, user, next)