from django.contrib.auth.models import User, Group

from django.core.exceptions import PermissionDenied

from django import template

from django.shortcuts import render_to_response, get_object_or_404

from django.template import RequestContext

from django.utils.html import escape

from django.http import HttpResponseRedirect

from django.utils.translation import ugettext, ugettext_lazy as _

from django.contrib.auth.forms import UserCreationForm, UserChangeForm, AdminPasswordChangeForm

from django.contrib import admin

class GroupAdmin(admin.ModelAdmin):

    search_fields = ('name',)

    ordering = ('name',)

    filter_horizontal = ('permissions',)

class UserAdmin(admin.ModelAdmin):

    fieldsets = (

        (None, {'fields': ('username', 'password')}),

        (_('Personal info'), {'fields': ('first_name', 'last_name', 'email')}),

        (_('Permissions'), {'fields': ('is_staff', 'is_active', 'is_superuser', 'user_permissions')}),

        (_('Important dates'), {'fields': ('last_login', 'date_joined')}),

        (_('Groups'), {'fields': ('groups',)}),

    )

    form = UserChangeForm

    add_form = UserCreationForm

    change_password_form = AdminPasswordChangeForm

    list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff')

    list_filter = ('is_staff', 'is_superuser')

    search_fields = ('username', 'first_name', 'last_name', 'email')

    ordering = ('username',)

    filter_horizontal = ('user_permissions',)

    def __call__(self, request, url):

        # this should not be here, but must be due to the way __call__ routes

        # in ModelAdmin.

        if url is None:

            return self.changelist_view(request)

        if url.endswith('password'):

            return self.user_change_password(request, url.split('/')[0])

        return super(UserAdmin, self).__call__(request, url)

    def add_view(self, request):

        if not self.has_change_permission(request):

            raise PermissionDenied

        if request.method == 'POST':

            form = self.add_form(request.POST)

            if form.is_valid():

                new_user = form.save()

                msg = _('The %(name)s "%(obj)s" was added successfully.') % {'name': 'user', 'obj': new_user}

                self.log_addition(request, new_user)

                if "_addanother" in request.POST:

                    request.user.message_set.create(message=msg)

                    return HttpResponseRedirect(request.path)

                elif '_popup' in request.REQUEST:

                    return self.response_add(request, new_user)

                else:

                    request.user.message_set.create(message=msg + ' ' + ugettext("You may edit it again below."))

                    return HttpResponseRedirect('../%s/' % new_user.id)

        else:

            form = self.add_form()

        return render_to_response('admin/auth/user/add_form.html', {

            'title': _('Add user'),

            'form': form,

            'is_popup': '_popup' in request.REQUEST,

            'add': True,

            'change': False,

            'has_add_permission': True,

            'has_delete_permission': False,

            'has_change_permission': True,

            'has_file_field': False,

            'has_absolute_url': False,

            'auto_populated_fields': (),

            'opts': self.model._meta,

            'save_as': False,

            'username_help_text': self.model._meta.get_field('username').help_text,

            'root_path': self.admin_site.root_path,

            'app_label': self.model._meta.app_label,            

        }, context_instance=template.RequestContext(request))

    def user_change_password(self, request, id):

        if not request.user.has_perm('auth.change_user'):

            raise PermissionDenied

        user = get_object_or_404(self.model, pk=id)

        if request.method == 'POST':

            form = self.change_password_form(user, request.POST)

            if form.is_valid():

                new_user = form.save()

                msg = ugettext('Password changed successfully.')

                request.user.message_set.create(message=msg)

                return HttpResponseRedirect('..')

        else:

            form = self.change_password_form(user)

        return render_to_response('admin/auth/user/change_password.html', {

            'title': _('Change password: %s') % escape(user.username),

            'form': form,

            'is_popup': '_popup' in request.REQUEST,

            'add': True,

            'change': False,

            'has_delete_permission': False,

            'has_change_permission': True,

            'has_absolute_url': False,

            'opts': self.model._meta,

            'original': user,

            'save_as': False,

            'show_save': True,

            'root_path': self.admin_site.root_path,

        }, context_instance=RequestContext(request))

admin.site.register(Group, GroupAdmin)

admin.site.register(User, UserAdmin)