from functools import update_wrapper, partial
from django import forms, template
from django.forms.formsets import all_valid
from django.forms.models import (modelform_factory, modelformset_factory,
    inlineformset_factory, BaseInlineFormSet)
from django.contrib.contenttypes.models import ContentType
from django.contrib.admin import widgets, helpers
from django.contrib.admin.util import unquote, flatten_fieldsets, get_deleted_objects, model_format_dict
from django.contrib import messages
from django.views.decorators.csrf import csrf_protect
from django.core.exceptions import PermissionDenied, ValidationError
from django.core.paginator import Paginator
from django.db import models, transaction, router
from django.db.models.related import RelatedObject
from django.db.models.fields import BLANK_CHOICE_DASH, FieldDoesNotExist
from django.db.models.sql.constants import LOOKUP_SEP, QUERY_TERMS
from django.http import Http404, HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, render_to_response
from django.utils.decorators import method_decorator
from django.utils.datastructures import SortedDict
from django.utils.html import escape, escapejs
from django.utils.safestring import mark_safe
from django.utils.text import capfirst, get_text_list
from django.utils.translation import ugettext as _
from django.utils.translation import ungettext
from django.utils.encoding import force_unicode

HORIZONTAL, VERTICAL = 1, 2
# returns the <ul> class for a given radio_admin field
get_ul_class = lambda x: 'radiolist%s' % ((x == HORIZONTAL) and ' inline' or '')

class IncorrectLookupParameters(Exception):
    pass

# Defaults for formfield_overrides. ModelAdmin subclasses can change this
# by adding to ModelAdmin.formfield_overrides.

FORMFIELD_FOR_DBFIELD_DEFAULTS = {
    models.DateTimeField: {
        'form_class': forms.SplitDateTimeField,
        'widget': widgets.AdminSplitDateTime
    },
    models.DateField:       {'widget': widgets.AdminDateWidget},
    models.TimeField:       {'widget': widgets.AdminTimeWidget},
    models.TextField:       {'widget': widgets.AdminTextareaWidget},
    models.URLField:        {'widget': widgets.AdminURLFieldWidget},
    models.IntegerField:    {'widget': widgets.AdminIntegerFieldWidget},
    models.BigIntegerField: {'widget': widgets.AdminIntegerFieldWidget},
    models.CharField:       {'widget': widgets.AdminTextInputWidget},
    models.ImageField:      {'widget': widgets.AdminFileWidget},
    models.FileField:       {'widget': widgets.AdminFileWidget},
}

csrf_protect_m = method_decorator(csrf_protect)

class BaseModelAdmin(object):
    """Functionality common to both ModelAdmin and InlineAdmin."""
    __metaclass__ = forms.MediaDefiningClass

    raw_id_fields = ()
    fields = None
    exclude = None
    fieldsets = None
    form = forms.ModelForm
    filter_vertical = ()
    filter_horizontal = ()
    radio_fields = {}
    prepopulated_fields = {}
    formfield_overrides = {}
    readonly_fields = ()
    ordering = None

    def __init__(self):
        overrides = FORMFIELD_FOR_DBFIELD_DEFAULTS.copy()
        overrides.update(self.formfield_overrides)
        self.formfield_overrides = overrides

    def formfield_for_dbfield(self, db_field, **kwargs):
        """
        Hook for specifying the form Field instance for a given database Field
        instance.

        If kwargs are given, they're passed to the form Field's constructor.
        """
        request = kwargs.pop("request", None)

        # If the field specifies choices, we don't need to look for special
        # admin widgets - we just need to use a select widget of some kind.
        if db_field.choices:
            return self.formfield_for_choice_field(db_field, request, **kwargs)

        # ForeignKey or ManyToManyFields
        if isinstance(db_field, (models.ForeignKey, models.ManyToManyField)):
            # Combine the field kwargs with any options for formfield_overrides.
            # Make sure the passed in **kwargs override anything in
            # formfield_overrides because **kwargs is more specific, and should
            # always win.
            if db_field.__class__ in self.formfield_overrides:
                kwargs = dict(self.formfield_overrides[db_field.__class__], **kwargs)

            # Get the correct formfield.
            if isinstance(db_field, models.ForeignKey):
                formfield = self.formfield_for_foreignkey(db_field, request, **kwargs)
            elif isinstance(db_field, models.ManyToManyField):
                formfield = self.formfield_for_manytomany(db_field, request, **kwargs)

            # For non-raw_id fields, wrap the widget with a wrapper that adds
            # extra HTML -- the "add other" interface -- to the end of the
            # rendered output. formfield can be None if it came from a
            # OneToOneField with parent_link=True or a M2M intermediary.
            if formfield and db_field.name not in self.raw_id_fields:
                related_modeladmin = self.admin_site._registry.get(
                                                            db_field.rel.to)
                can_add_related = bool(related_modeladmin and
                            related_modeladmin.has_add_permission(request))
                formfield.widget = widgets.RelatedFieldWidgetWrapper(
                            formfield.widget, db_field.rel, self.admin_site,
                            can_add_related=can_add_related)

            return formfield

        # If we've got overrides for the formfield defined, use 'em. **kwargs
        # passed to formfield_for_dbfield override the defaults.
        for klass in db_field.__class__.mro():
            if klass in self.formfield_overrides:
                kwargs = dict(self.formfield_overrides[klass], **kwargs)
                return db_field.formfield(**kwargs)

        # For any other type of field, just call its formfield() method.
        return db_field.formfield(**kwargs)

    def formfield_for_choice_field(self, db_field, request=None, **kwargs):
        """
        Get a form Field for a database Field that has declared choices.
        """
        # If the field is named as a radio_field, use a RadioSelect
        if db_field.name in self.radio_fields:
            # Avoid stomping on custom widget/choices arguments.
            if 'widget' not in kwargs:
                kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                    'class': get_ul_class(self.radio_fields[db_field.name]),
                })
            if 'choices' not in kwargs:
                kwargs['choices'] = db_field.get_choices(
                    include_blank = db_field.blank,
                    blank_choice=[('', _('None'))]
                )
        return db_field.formfield(**kwargs)

    def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
        """
        Get a form Field for a ForeignKey.
        """
        db = kwargs.get('using')
        if db_field.name in self.raw_id_fields:
            kwargs['widget'] = widgets.ForeignKeyRawIdWidget(db_field.rel, using=db)
        elif db_field.name in self.radio_fields:
            kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                'class': get_ul_class(self.radio_fields[db_field.name]),
            })
            kwargs['empty_label'] = db_field.blank and _('None') or None

        return db_field.formfield(**kwargs)

    def formfield_for_manytomany(self, db_field, request=None, **kwargs):
        """
        Get a form Field for a ManyToManyField.
        """
        # If it uses an intermediary model that isn't auto created, don't show
        # a field in admin.
        if not db_field.rel.through._meta.auto_created:
            return None
        db = kwargs.get('using')

        if db_field.name in self.raw_id_fields:
            kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel, using=db)
            kwargs['help_text'] = ''
        elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
            kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))

        return db_field.formfield(**kwargs)

    def _declared_fieldsets(self):
        if self.fieldsets:
            return self.fieldsets
        elif self.fields:
            return [(None, {'fields': self.fields})]
        return None
    declared_fieldsets = property(_declared_fieldsets)

    def get_readonly_fields(self, request, obj=None):
        """
        Hook for specifying custom readonly fields.
        """
        return self.readonly_fields

    def get_prepopulated_fields(self, request, obj=None):
        """
        Hook for specifying custom prepopulated fields.
        """
        return self.prepopulated_fields

    def queryset(self, request):
        """
        Returns a QuerySet of all model instances that can be edited by the
        admin site. This is used by changelist_view.
        """
        qs = self.model._default_manager.get_query_set()
        # TODO: this should be handled by some parameter to the ChangeList.
        ordering = self.ordering or () # otherwise we might try to *None, which is bad ;)
        if ordering:
            qs = qs.order_by(*ordering)
        return qs

    def lookup_allowed(self, lookup, value):
        model = self.model
        # Check FKey lookups that are allowed, so that popups produced by
        # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
        # are allowed to work.
        for l in model._meta.related_fkey_lookups:
            for k, v in widgets.url_params_from_lookup_dict(l).items():
                if k == lookup and v == value:
                    return True

        parts = lookup.split(LOOKUP_SEP)

        # Last term in lookup is a query term (__exact, __startswith etc)
        # This term can be ignored.
        if len(parts) > 1 and parts[-1] in QUERY_TERMS:
            parts.pop()

        # Special case -- foo__id__exact and foo__id queries are implied
        # if foo has been specificially included in the lookup list; so
        # drop __id if it is the last part. However, first we need to find
        # the pk attribute name.
        pk_attr_name = None
        for part in parts[:-1]:
            field, _, _, _ = model._meta.get_field_by_name(part)
            if hasattr(field, 'rel'):
                model = field.rel.to
                pk_attr_name = model._meta.pk.name
            elif isinstance(field, RelatedObject):
                model = field.model
                pk_attr_name = model._meta.pk.name
            else:
                pk_attr_name = None
        if pk_attr_name and len(parts) > 1 and parts[-1] == pk_attr_name:
            parts.pop()

        try:
            self.model._meta.get_field_by_name(parts[0])
        except FieldDoesNotExist:
            # Lookups on non-existants fields are ok, since they're ignored
            # later.
            return True
        else:
            if len(parts) == 1:
                return True
            clean_lookup = LOOKUP_SEP.join(parts)
            return clean_lookup in self.list_filter or clean_lookup == self.date_hierarchy

class ModelAdmin(BaseModelAdmin):
    "Encapsulates all admin options and functionality for a given model."

    list_display = ('__str__',)
    list_display_links = ()
    list_filter = ()
    list_select_related = False
    list_per_page = 100
    list_editable = ()
    search_fields = ()
    date_hierarchy = None
    save_as = False
    save_on_top = False
    paginator = Paginator
    inlines = []

    # Custom templates (designed to be over-ridden in subclasses)
    add_form_template = None
    change_form_template = None
    change_list_template = None
    delete_confirmation_template = None
    delete_selected_confirmation_template = None
    object_history_template = None

    # Actions
    actions = []
    action_form = helpers.ActionForm
    actions_on_top = True
    actions_on_bottom = False
    actions_selection_counter = True

    def __init__(self, model, admin_site):
        self.model = model
        self.opts = model._meta
        self.admin_site = admin_site
        self.inline_instances = []
        for inline_class in self.inlines:
            inline_instance = inline_class(self.model, self.admin_site)
            self.inline_instances.append(inline_instance)
        if 'action_checkbox' not in self.list_display and self.actions is not None:
            self.list_display = ['action_checkbox'] +  list(self.list_display)
        if not self.list_display_links:
            for name in self.list_display:
                if name != 'action_checkbox':
                    self.list_display_links = [name]
                    break
        super(ModelAdmin, self).__init__()

    def get_urls(self):
        from django.conf.urls.defaults import patterns, url

        def wrap(view):
            def wrapper(*args, **kwargs):
                return self.admin_site.admin_view(view)(*args, **kwargs)
            return update_wrapper(wrapper, view)

        info = self.model._meta.app_label, self.model._meta.module_name

        urlpatterns = patterns('',
            url(r'^$',
                wrap(self.changelist_view),
                name='%s_%s_changelist' % info),
            url(r'^add/$',
                wrap(self.add_view),
                name='%s_%s_add' % info),
            url(r'^(.+)/history/$',
                wrap(self.history_view),
                name='%s_%s_history' % info),
            url(r'^(.+)/delete/$',
                wrap(self.delete_view),
                name='%s_%s_delete' % info),
            url(r'^(.+)/$',
                wrap(self.change_view),
                name='%s_%s_change' % info),
        )
        return urlpatterns

    def urls(self):
        return self.get_urls()
    urls = property(urls)

    def _media(self):
        from django.conf import settings

        js = ['js/core.js', 'js/admin/RelatedObjectLookups.js',
              'js/jquery.min.js', 'js/jquery.init.js']
        if self.actions is not None:
            js.extend(['js/actions.min.js'])
        if self.prepopulated_fields:
            js.append('js/urlify.js')
            js.append('js/prepopulate.min.js')
        if self.opts.get_ordered_objects():
            js.extend(['js/getElementsBySelector.js', 'js/dom-drag.js' , 'js/admin/ordering.js'])

        return forms.Media(js=['%s%s' % (settings.ADMIN_MEDIA_PREFIX, url) for url in js])
    media = property(_media)

    def has_add_permission(self, request):
        """
        Returns True if the given request has permission to add an object.
        Can be overriden by the user in subclasses.
        """
        opts = self.opts
        return request.user.has_perm(opts.app_label + '.' + opts.get_add_permission())

    def has_change_permission(self, request, obj=None):
        """
        Returns True if the given request has permission to change the given
        Django model instance, the default implementation doesn't examine the
        `obj` parameter.

        Can be overriden by the user in subclasses. In such case it should
        return True if the given request has permission to change the `obj`
        model instance. If `obj` is None, this should return True if the given
        request has permission to change *any* object of the given type.
        """
        opts = self.opts
        return request.user.has_perm(opts.app_label + '.' + opts.get_change_permission())

    def has_delete_permission(self, request, obj=None):
        """
        Returns True if the given request has permission to change the given
        Django model instance, the default implementation doesn't examine the
        `obj` parameter.

        Can be overriden by the user in subclasses. In such case it should
        return True if the given request has permission to delete the `obj`
        model instance. If `obj` is None, this should return True if the given
        request has permission to delete *any* object of the given type.
        """
        opts = self.opts
        return request.user.has_perm(opts.app_label + '.' + opts.get_delete_permission())

    def get_model_perms(self, request):
        """
        Returns a dict of all perms for this model. This dict has the keys
        ``add``, ``change``, and ``delete`` mapping to the True/False for each
        of those actions.
        """
        return {
            'add': self.has_add_permission(request),
            'change': self.has_change_permission(request),
            'delete': self.has_delete_permission(request),
        }

    def get_fieldsets(self, request, obj=None):
        "Hook for specifying fieldsets for the add form."
        if self.declared_fieldsets:
            return self.declared_fieldsets
        form = self.get_form(request, obj)
        fields = form.base_fields.keys() + list(self.get_readonly_fields(request, obj))
        return [(None, {'fields': fields})]

    def get_form(self, request, obj=None, **kwargs):
        """
        Returns a Form class for use in the admin add view. This is used by
        add_view and change_view.
        """
        if self.declared_fieldsets:
            fields = flatten_fieldsets(self.declared_fieldsets)
        else:
            fields = None
        if self.exclude is None:
            exclude = []
        else:
            exclude = list(self.exclude)
        exclude.extend(kwargs.get("exclude", []))
        exclude.extend(self.get_readonly_fields(request, obj))
        # if exclude is an empty list we pass None to be consistant with the
        # default on modelform_factory
        exclude = exclude or None
        defaults = {
            "form": self.form,
            "fields": fields,
            "exclude": exclude,
            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
        }
        defaults.update(kwargs)
        return modelform_factory(self.model, **defaults)

    def get_changelist(self, request, **kwargs):
        """
        Returns the ChangeList class for use on the changelist page.
        """
        from django.contrib.admin.views.main import ChangeList
        return ChangeList

    def get_object(self, request, object_id):
        """
        Returns an instance matching the primary key provided. ``None``  is
        returned if no match is found (or the object_id failed validation
        against the primary key field).
        """
        queryset = self.queryset(request)
        model = queryset.model
        try:
            object_id = model._meta.pk.to_python(object_id)
            return queryset.get(pk=object_id)
        except (model.DoesNotExist, ValidationError):
            return None

    def get_changelist_form(self, request, **kwargs):
        """
        Returns a Form class for use in the Formset on the changelist page.
        """
        defaults = {
            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
        }
        defaults.update(kwargs)
        return modelform_factory(self.model, **defaults)

    def get_changelist_formset(self, request, **kwargs):
        """
        Returns a FormSet class for use on the changelist page if list_editable
        is used.
        """
        defaults = {
            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
        }
        defaults.update(kwargs)
        return modelformset_factory(self.model,
            self.get_changelist_form(request), extra=0,
            fields=self.list_editable, **defaults)

    def get_formsets(self, request, obj=None):
        for inline in self.inline_instances:
            yield inline.get_formset(request, obj)

    def get_paginator(self, request, queryset, per_page, orphans=0, allow_empty_first_page=True):
        return self.paginator(queryset, per_page, orphans, allow_empty_first_page)

    def log_addition(self, request, object):
        """
        Log that an object has been successfully added.

        The default implementation creates an admin LogEntry object.
        """
        from django.contrib.admin.models import LogEntry, ADDITION
        LogEntry.objects.log_action(
            user_id         = request.user.pk,
            content_type_id = ContentType.objects.get_for_model(object).pk,
            object_id       = object.pk,
            object_repr     = force_unicode(object),
            action_flag     = ADDITION
        )

    def log_change(self, request, object, message):
        """
        Log that an object has been successfully changed.

        The default implementation creates an admin LogEntry object.
        """
        from django.contrib.admin.models import LogEntry, CHANGE
        LogEntry.objects.log_action(
            user_id         = request.user.pk,
            content_type_id = ContentType.objects.get_for_model(object).pk,
            object_id       = object.pk,
            object_repr     = force_unicode(object),
            action_flag     = CHANGE,
            change_message  = message
        )

    def log_deletion(self, request, object, object_repr):
        """
        Log that an object will be deleted. Note that this method is called
        before the deletion.

        The default implementation creates an admin LogEntry object.
        """
        from django.contrib.admin.models import LogEntry, DELETION
        LogEntry.objects.log_action(
            user_id         = request.user.id,
            content_type_id = ContentType.objects.get_for_model(self.model).pk,
            object_id       = object.pk,
            object_repr     = object_repr,
            action_flag     = DELETION
        )

    def action_checkbox(self, obj):
        """
        A list_display column containing a checkbox widget.
        """
        return helpers.checkbox.render(helpers.ACTION_CHECKBOX_NAME, force_unicode(obj.pk))
    action_checkbox.short_description = mark_safe('<input type="checkbox" id="action-toggle" />')
    action_checkbox.allow_tags = True

    def get_actions(self, request):
        """
        Return a dictionary mapping the names of all actions for this
        ModelAdmin to a tuple of (callable, name, description) for each action.
        """
        # If self.actions is explicitally set to None that means that we don't
        # want *any* actions enabled on this page.
        from django.contrib.admin.views.main import IS_POPUP_VAR
        if self.actions is None or IS_POPUP_VAR in request.GET:
            return SortedDict()

        actions = []

        # Gather actions from the admin site first
        for (name, func) in self.admin_site.actions:
            description = getattr(func, 'short_description', name.replace('_', ' '))
            actions.append((func, name, description))

        # Then gather them from the model admin and all parent classes,
        # starting with self and working back up.
        for klass in self.__class__.mro()[::-1]:
            class_actions = getattr(klass, 'actions', [])
            # Avoid trying to iterate over None
            if not class_actions:
                continue
            actions.extend([self.get_action(action) for action in class_actions])

        # get_action might have returned None, so filter any of those out.
        actions = filter(None, actions)

        # Convert the actions into a SortedDict keyed by name
        # and sorted by description.
        actions.sort(key=lambda k: k[2].lower())
        actions = SortedDict([
            (name, (func, name, desc))
            for func, name, desc in actions
        ])

        return actions

    def get_action_choices(self, request, default_choices=BLANK_CHOICE_DASH):
        """
        Return a list of choices for use in a form object.  Each choice is a
        tuple (name, description).
        """
        choices = [] + default_choices
        for func, name, description in self.get_actions(request).itervalues():
            choice = (name, description % model_format_dict(self.opts))
            choices.append(choice)
        return choices

    def get_action(self, action):
        """
        Return a given action from a parameter, which can either be a callable,
        or the name of a method on the ModelAdmin.  Return is a tuple of
        (callable, name, description).
        """
        # If the action is a callable, just use it.
        if callable(action):
            func = action
            action = action.__name__

        # Next, look for a method. Grab it off self.__class__ to get an unbound
        # method instead of a bound one; this ensures that the calling
        # conventions are the same for functions and methods.
        elif hasattr(self.__class__, action):
            func = getattr(self.__class__, action)

        # Finally, look for a named method on the admin site
        else:
            try:
                func = self.admin_site.get_action(action)
            except KeyError:
                return None

        if hasattr(func, 'short_description'):
            description = func.short_description
        else:
            description = capfirst(action.replace('_', ' '))
        return func, action, description

    def construct_change_message(self, request, form, formsets):
        """
        Construct a change message from a changed object.
        """
        change_message = []
        if form.changed_data:
            change_message.append(_('Changed %s.') % get_text_list(form.changed_data, _('and')))

        if formsets:
            for formset in formsets:
                for added_object in formset.new_objects:
                    change_message.append(_('Added %(name)s "%(object)s".')
                                          % {'name': force_unicode(added_object._meta.verbose_name),
                                             'object': force_unicode(added_object)})
                for changed_object, changed_fields in formset.changed_objects:
                    change_message.append(_('Changed %(list)s for %(name)s "%(object)s".')
                                          % {'list': get_text_list(changed_fields, _('and')),
                                             'name': force_unicode(changed_object._meta.verbose_name),
                                             'object': force_unicode(changed_object)})
                for deleted_object in formset.deleted_objects:
                    change_message.append(_('Deleted %(name)s "%(object)s".')
                                          % {'name': force_unicode(deleted_object._meta.verbose_name),
                                             'object': force_unicode(deleted_object)})
        change_message = ' '.join(change_message)
        return change_message or _('No fields changed.')

    def message_user(self, request, message):
        """
        Send a message to the user. The default implementation
        posts a message using the django.contrib.messages backend.
        """
        messages.info(request, message)

    def save_form(self, request, form, change):
        """
        Given a ModelForm return an unsaved instance. ``change`` is True if
        the object is being changed, and False if it's being added.
        """
        return form.save(commit=False)

    def save_model(self, request, obj, form, change):
        """
        Given a model instance save it to the database.
        """
        obj.save()

    def delete_model(self, request, obj):
        """
        Given a model instance delete it from the database.
        """
        obj.delete()

    def save_formset(self, request, form, formset, change):
        """
        Given an inline formset save it to the database.
        """
        formset.save()

    def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
        opts = self.model._meta
        app_label = opts.app_label
        ordered_objects = opts.get_ordered_objects()
        context.update({
            'add': add,
            'change': change,
            'has_add_permission': self.has_add_permission(request),
            'has_change_permission': self.has_change_permission(request, obj),
            'has_delete_permission': self.has_delete_permission(request, obj),
            'has_file_field': True, # FIXME - this should check if form or formsets have a FileField,
            'has_absolute_url': hasattr(self.model, 'get_absolute_url'),
            'ordered_objects': ordered_objects,
            'form_url': mark_safe(form_url),
            'opts': opts,
            'content_type_id': ContentType.objects.get_for_model(self.model).id,
            'save_as': self.save_as,
            'save_on_top': self.save_on_top,
            'root_path': self.admin_site.root_path,
        })
        if add and self.add_form_template is not None:
            form_template = self.add_form_template
        else:
            form_template = self.change_form_template
        context_instance = template.RequestContext(request, current_app=self.admin_site.name)
        return render_to_response(form_template or [
            "admin/%s/%s/change_form.html" % (app_label, opts.object_name.lower()),
            "admin/%s/change_form.html" % app_label,
            "admin/change_form.html"
        ], context, context_instance=context_instance)

    def response_add(self, request, obj, post_url_continue='../%s/'):
        """
        Determines the HttpResponse for the add_view stage.
        """
        opts = obj._meta
        pk_value = obj._get_pk_val()

        msg = _('The %(name)s "%(obj)s" was added successfully.') % {'name': force_unicode(opts.verbose_name), 'obj': force_unicode(obj)}
        # Here, we distinguish between different save types by checking for
        # the presence of keys in request.POST.
        if "_continue" in request.POST:
            self.message_user(request, msg + ' ' + _("You may edit it again below."))
            if "_popup" in request.POST:
                post_url_continue += "?_popup=1"
            return HttpResponseRedirect(post_url_continue % pk_value)

        if "_popup" in request.POST:
            return HttpResponse('<script type="text/javascript">opener.dismissAddAnotherPopup(window, "%s", "%s");</script>' % \
                # escape() calls force_unicode.
                (escape(pk_value), escapejs(obj)))
        elif "_addanother" in request.POST:
            self.message_user(request, msg + ' ' + (_("You may add another %s below.") % force_unicode(opts.verbose_name)))
            return HttpResponseRedirect(request.path)
        else:
            self.message_user(request, msg)

            # Figure out where to redirect. If the user has change permission,
            # redirect to the change-list page for this object. Otherwise,
            # redirect to the admin index.
            if self.has_change_permission(request, None):
                post_url = '../'
            else:
                post_url = '../../../'
            return HttpResponseRedirect(post_url)

    def response_change(self, request, obj):
        """
        Determines the HttpResponse for the change_view stage.
        """
        opts = obj._meta

        # Handle proxy models automatically created by .only() or .defer()
        verbose_name = opts.verbose_name
        if obj._deferred:
            opts_ = opts.proxy_for_model._meta
            verbose_name = opts_.verbose_name

        pk_value = obj._get_pk_val()

        msg = _('The %(name)s "%(obj)s" was changed successfully.') % {'name': force_unicode(verbose_name), 'obj': force_unicode(obj)}
        if "_continue" in request.POST:
            self.message_user(request, msg + ' ' + _("You may edit it again below."))
            if "_popup" in request.REQUEST:
                return HttpResponseRedirect(request.path + "?_popup=1")
            else:
                return HttpResponseRedirect(request.path)
        elif "_saveasnew" in request.POST:
            msg = _('The %(name)s "%(obj)s" was added successfully. You may edit it again below.') % {'name': force_unicode(verbose_name), 'obj': obj}
            self.message_user(request, msg)
            return HttpResponseRedirect("../%s/" % pk_value)
        elif "_addanother" in request.POST:
            self.message_user(request, msg + ' ' + (_("You may add another %s below.") % force_unicode(verbose_name)))
            return HttpResponseRedirect("../add/")
        else:
            self.message_user(request, msg)
            # Figure out where to redirect. If the user has change permission,
            # redirect to the change-list page for this object. Otherwise,
            # redirect to the admin index.
            if self.has_change_permission(request, None):
                return HttpResponseRedirect('../')
            else:
                return HttpResponseRedirect('../../../')

    def response_action(self, request, queryset):
        """
        Handle an admin action. This is called if a request is POSTed to the
        changelist; it returns an HttpResponse if the action was handled, and
        None otherwise.
        """

        # There can be multiple action forms on the page (at the top
        # and bottom of the change list, for example). Get the action
        # whose button was pushed.
        try:
            action_index = int(request.POST.get('index', 0))
        except ValueError:
            action_index = 0

        # Construct the action form.
        data = request.POST.copy()
        data.pop(helpers.ACTION_CHECKBOX_NAME, None)
        data.pop("index", None)

        # Use the action whose button was pushed
        try:
            data.update({'action': data.getlist('action')[action_index]})
        except IndexError:
            # If we didn't get an action from the chosen form that's invalid
            # POST data, so by deleting action it'll fail the validation check
            # below. So no need to do anything here
            pass

        action_form = self.action_form(data, auto_id=None)
        action_form.fields['action'].choices = self.get_action_choices(request)

        # If the form's valid we can handle the action.
        if action_form.is_valid():
            action = action_form.cleaned_data['action']
            select_across = action_form.cleaned_data['select_across']
            func, name, description = self.get_actions(request)[action]

            # Get the list of selected PKs. If nothing's selected, we can't
            # perform an action on it, so bail. Except we want to perform
            # the action explicitly on all objects.
            selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
            if not selected and not select_across:
                # Reminder that something needs to be selected or nothing will happen
                msg = _("Items must be selected in order to perform "
                        "actions on them. No items have been changed.")
                self.message_user(request, msg)
                return None

            if not select_across:
                # Perform the action only on the selected objects
                queryset = queryset.filter(pk__in=selected)

            response = func(self, request, queryset)

            # Actions may return an HttpResponse, which will be used as the
            # response from the POST. If not, we'll be a good little HTTP
            # citizen and redirect back to the changelist page.
            if isinstance(response, HttpResponse):
                return response
            else:
                return HttpResponseRedirect(request.get_full_path())
        else:
            msg = _("No action selected.")
            self.message_user(request, msg)
            return None

    @csrf_protect_m
    @transaction.commit_on_success
    def add_view(self, request, form_url='', extra_context=None):
        "The 'add' admin view for this model."
        model = self.model
        opts = model._meta

        if not self.has_add_permission(request):
            raise PermissionDenied

        ModelForm = self.get_form(request)
        formsets = []
        if request.method == 'POST':
            form = ModelForm(request.POST, request.FILES)
            if form.is_valid():
                new_object = self.save_form(request, form, change=False)
                form_validated = True
            else:
                form_validated = False
                new_object = self.model()
            prefixes = {}
            for FormSet, inline in zip(self.get_formsets(request), self.inline_instances):
                prefix = FormSet.get_default_prefix()
                prefixes[prefix] = prefixes.get(prefix, 0) + 1
                if prefixes[prefix] != 1:
                    prefix = "%s-%s" % (prefix, prefixes[prefix])
                formset = FormSet(data=request.POST, files=request.FILES,
                                  instance=new_object,
                                  save_as_new="_saveasnew" in request.POST,
                                  prefix=prefix, queryset=inline.queryset(request))
                formsets.append(formset)
            if all_valid(formsets) and form_validated:
                self.save_model(request, new_object, form, change=False)
                form.save_m2m()
                for formset in formsets:
                    self.save_formset(request, form, formset, change=False)

                self.log_addition(request, new_object)
                return self.response_add(request, new_object)
        else:
            # Prepare the dict of initial data from the request.
            # We have to special-case M2Ms as a list of comma-separated PKs.
            initial = dict(request.GET.items())
            for k in initial:
                try:
                    f = opts.get_field(k)
                except models.FieldDoesNotExist:
                    continue
                if isinstance(f, models.ManyToManyField):
                    initial[k] = initial[k].split(",")
            form = ModelForm(initial=initial)
            prefixes = {}
            for FormSet, inline in zip(self.get_formsets(request),
                                       self.inline_instances):
                prefix = FormSet.get_default_prefix()
                prefixes[prefix] = prefixes.get(prefix, 0) + 1
                if prefixes[prefix] != 1:
                    prefix = "%s-%s" % (prefix, prefixes[prefix])
                formset = FormSet(instance=self.model(), prefix=prefix,
                                  queryset=inline.queryset(request))
                formsets.append(formset)

        adminForm = helpers.AdminForm(form, list(self.get_fieldsets(request)),
            self.get_prepopulated_fields(request),
            self.get_readonly_fields(request),
            model_admin=self)
        media = self.media + adminForm.media

        inline_admin_formsets = []
        for inline, formset in zip(self.inline_instances, formsets):
            fieldsets = list(inline.get_fieldsets(request))
            readonly = list(inline.get_readonly_fields(request))
            prepopulated = dict(inline.get_prepopulated_fields(request))
            inline_admin_formset = helpers.InlineAdminFormSet(inline, formset,
                fieldsets, prepopulated, readonly, model_admin=self)
            inline_admin_formsets.append(inline_admin_formset)
            media = media + inline_admin_formset.media

        context = {
            'title': _('Add %s') % force_unicode(opts.verbose_name),
            'adminform': adminForm,
            'is_popup': "_popup" in request.REQUEST,
            'show_delete': False,
            'media': mark_safe(media),
            'inline_admin_formsets': inline_admin_formsets,
            'errors': helpers.AdminErrorList(form, formsets),
            'root_path': self.admin_site.root_path,
            'app_label': opts.app_label,
        }
        context.update(extra_context or {})
        return self.render_change_form(request, context, form_url=form_url, add=True)

    @csrf_protect_m
    @transaction.commit_on_success
    def change_view(self, request, object_id, extra_context=None):
        "The 'change' admin view for this model."
        model = self.model
        opts = model._meta

        obj = self.get_object(request, unquote(object_id))

        if not self.has_change_permission(request, obj):
            raise PermissionDenied

        if obj is None:
            raise Http404(_('%(name)s object with primary key %(key)r does not exist.') % {'name': force_unicode(opts.verbose_name), 'key': escape(object_id)})

        if request.method == 'POST' and "_saveasnew" in request.POST:
            return self.add_view(request, form_url='../add/')

        ModelForm = self.get_form(request, obj)
        formsets = []
        if request.method == 'POST':
            form = ModelForm(request.POST, request.FILES, instance=obj)
            if form.is_valid():
                form_validated = True
                new_object = self.save_form(request, form, change=True)
            else:
                form_validated = False
                new_object = obj
            prefixes = {}
            for FormSet, inline in zip(self.get_formsets(request, new_object),
                                       self.inline_instances):
                prefix = FormSet.get_default_prefix()
                prefixes[prefix] = prefixes.get(prefix, 0) + 1
                if prefixes[prefix] != 1:
                    prefix = "%s-%s" % (prefix, prefixes[prefix])
                formset = FormSet(request.POST, request.FILES,
                                  instance=new_object, prefix=prefix,
                                  queryset=inline.queryset(request))

                formsets.append(formset)

            if all_valid(formsets) and form_validated:
                self.save_model(request, new_object, form, change=True)
                form.save_m2m()
                for formset in formsets:
                    self.save_formset(request, form, formset, change=True)

                change_message = self.construct_change_message(request, form, formsets)
                self.log_change(request, new_object, change_message)
                return self.response_change(request, new_object)

        else:
            form = ModelForm(instance=obj)
            prefixes = {}
            for FormSet, inline in zip(self.get_formsets(request, obj), self.inline_instances):
                prefix = FormSet.get_default_prefix()
                prefixes[prefix] = prefixes.get(prefix, 0) + 1
                if prefixes[prefix] != 1:
                    prefix = "%s-%s" % (prefix, prefixes[prefix])
                formset = FormSet(instance=obj, prefix=prefix,
                                  queryset=inline.queryset(request))
                formsets.append(formset)

        adminForm = helpers.AdminForm(form, self.get_fieldsets(request, obj),
            self.get_prepopulated_fields(request, obj),
            self.get_readonly_fields(request, obj),
            model_admin=self)
        media = self.media + adminForm.media

        inline_admin_formsets = []
        for inline, formset in zip(self.inline_instances, formsets):
            fieldsets = list(inline.get_fieldsets(request, obj))
            readonly = list(inline.get_readonly_fields(request, obj))
            prepopulated = dict(inline.get_prepopulated_fields(request, obj))
            inline_admin_formset = helpers.InlineAdminFormSet(inline, formset,
                fieldsets, prepopulated, readonly, model_admin=self)
            inline_admin_formsets.append(inline_admin_formset)
            media = media + inline_admin_formset.media

        context = {
            'title': _('Change %s') % force_unicode(opts.verbose_name),
            'adminform': adminForm,
            'object_id': object_id,
            'original': obj,
            'is_popup': "_popup" in request.REQUEST,
            'media': mark_safe(media),
            'inline_admin_formsets': inline_admin_formsets,
            'errors': helpers.AdminErrorList(form, formsets),
            'root_path': self.admin_site.root_path,
            'app_label': opts.app_label,
        }
        context.update(extra_context or {})
        return self.render_change_form(request, context, change=True, obj=obj)

    @csrf_protect_m
    def changelist_view(self, request, extra_context=None):
        "The 'change list' admin view for this model."
        from django.contrib.admin.views.main import ERROR_FLAG
        opts = self.model._meta
        app_label = opts.app_label
        if not self.has_change_permission(request, None):
            raise PermissionDenied

        # Check actions to see if any are available on this changelist
        actions = self.get_actions(request)

        # Remove action checkboxes if there aren't any actions available.
        list_display = list(self.list_display)
        if not actions:
            try:
                list_display.remove('action_checkbox')
            except ValueError:
                pass

        ChangeList = self.get_changelist(request)
        try:
            cl = ChangeList(request, self.model, list_display, self.list_display_links,
                self.list_filter, self.date_hierarchy, self.search_fields,
                self.list_select_related, self.list_per_page, self.list_editable, self)
        except IncorrectLookupParameters:
            # Wacky lookup parameters were given, so redirect to the main
            # changelist page, without parameters, and pass an 'invalid=1'
            # parameter via the query string. If wacky parameters were given
            # and the 'invalid=1' parameter was already in the query string,
            # something is screwed up with the database, so display an error
            # page.
            if ERROR_FLAG in request.GET.keys():
                return render_to_response('admin/invalid_setup.html', {'title': _('Database error')})
            return HttpResponseRedirect(request.path + '?' + ERROR_FLAG + '=1')

        # If the request was POSTed, this might be a bulk action or a bulk
        # edit. Try to look up an action or confirmation first, but if this
        # isn't an action the POST will fall through to the bulk edit check,
        # below.
        action_failed = False
        selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)

        # Actions with no confirmation
        if (actions and request.method == 'POST' and
                'index' in request.POST and '_save' not in request.POST):
            if selected:
                response = self.response_action(request, queryset=cl.get_query_set())
                if response:
                    return response
                else:
                    action_failed = True
            else:
                msg = _("Items must be selected in order to perform "
                        "actions on them. No items have been changed.")
                self.message_user(request, msg)
                action_failed = True

        # Actions with confirmation
        if (actions and request.method == 'POST' and
                helpers.ACTION_CHECKBOX_NAME in request.POST and
                'index' not in request.POST and '_save' not in request.POST):
            if selected:
                response = self.response_action(request, queryset=cl.get_query_set())
                if response:
                    return response
                else:
                    action_failed = True

        # If we're allowing changelist editing, we need to construct a formset
        # for the changelist given all the fields to be edited. Then we'll
        # use the formset to validate/process POSTed data.
        formset = cl.formset = None

        # Handle POSTed bulk-edit data.
        if (request.method == "POST" and cl.list_editable and
                '_save' in request.POST and not action_failed):
            FormSet = self.get_changelist_formset(request)
            formset = cl.formset = FormSet(request.POST, request.FILES, queryset=cl.result_list)
            if formset.is_valid():
                changecount = 0
                for form in formset.forms:
                    if form.has_changed():
                        obj = self.save_form(request, form, change=True)
                        self.save_model(request, obj, form, change=True)
                        form.save_m2m()
                        change_msg = self.construct_change_message(request, form, None)
                        self.log_change(request, obj, change_msg)
                        changecount += 1

                if changecount:
                    if changecount == 1:
                        name = force_unicode(opts.verbose_name)
                    else:
                        name = force_unicode(opts.verbose_name_plural)
                    msg = ungettext("%(count)s %(name)s was changed successfully.",
                                    "%(count)s %(name)s were changed successfully.",
                                    changecount) % {'count': changecount,
                                                    'name': name,
                                                    'obj': force_unicode(obj)}
                    self.message_user(request, msg)

                return HttpResponseRedirect(request.get_full_path())

        # Handle GET -- construct a formset for display.
        elif cl.list_editable:
            FormSet = self.get_changelist_formset(request)
            formset = cl.formset = FormSet(queryset=cl.result_list)

        # Build the list of media to be used by the formset.
        if formset:
            media = self.media + formset.media
        else:
            media = self.media

        # Build the action form and populate it with available actions.
        if actions:
            action_form = self.action_form(auto_id=None)
            action_form.fields['action'].choices = self.get_action_choices(request)
        else:
            action_form = None

        selection_note_all = ungettext('%(total_count)s selected',
            'All %(total_count)s selected', cl.result_count)

        context = {
            'module_name': force_unicode(opts.verbose_name_plural),
            'selection_note': _('0 of %(cnt)s selected') % {'cnt': len(cl.result_list)},
            'selection_note_all': selection_note_all % {'total_count': cl.result_count},
            'title': cl.title,
            'is_popup': cl.is_popup,
            'cl': cl,
            'media': media,
            'has_add_permission': self.has_add_permission(request),
            'root_path': self.admin_site.root_path,
            'app_label': app_label,
            'action_form': action_form,
            'actions_on_top': self.actions_on_top,
            'actions_on_bottom': self.actions_on_bottom,
            'actions_selection_counter': self.actions_selection_counter,
        }
        context.update(extra_context or {})
        context_instance = template.RequestContext(request, current_app=self.admin_site.name)
        return render_to_response(self.change_list_template or [
            'admin/%s/%s/change_list.html' % (app_label, opts.object_name.lower()),
            'admin/%s/change_list.html' % app_label,
            'admin/change_list.html'
        ], context, context_instance=context_instance)

    @csrf_protect_m
    @transaction.commit_on_success
    def delete_view(self, request, object_id, extra_context=None):
        "The 'delete' admin view for this model."
        opts = self.model._meta
        app_label = opts.app_label

        obj = self.get_object(request, unquote(object_id))

        if not self.has_delete_permission(request, obj):
            raise PermissionDenied

        if obj is None:
            raise Http404(_('%(name)s object with primary key %(key)r does not exist.') % {'name': force_unicode(opts.verbose_name), 'key': escape(object_id)})

        using = router.db_for_write(self.model)

        # Populate deleted_objects, a data structure of all related objects that
        # will also be deleted.
        (deleted_objects, perms_needed, protected) = get_deleted_objects(
            [obj], opts, request.user, self.admin_site, using)

        if request.POST: # The user has already confirmed the deletion.
            if perms_needed:
                raise PermissionDenied
            obj_display = force_unicode(obj)
            self.log_deletion(request, obj, obj_display)
            self.delete_model(request, obj)

            self.message_user(request, _('The %(name)s "%(obj)s" was deleted successfully.') % {'name': force_unicode(opts.verbose_name), 'obj': force_unicode(obj_display)})

            if not self.has_change_permission(request, None):
                return HttpResponseRedirect("../../../../")
            return HttpResponseRedirect("../../")

        object_name = force_unicode(opts.verbose_name)

        if perms_needed or protected:
            title = _("Cannot delete %(name)s") % {"name": object_name}
        else:
            title = _("Are you sure?")

        context = {
            "title": title,
            "object_name": object_name,
            "object": obj,
            "deleted_objects": deleted_objects,
            "perms_lacking": perms_needed,
            "protected": protected,
            "opts": opts,
            "root_path": self.admin_site.root_path,
            "app_label": app_label,
        }
        context.update(extra_context or {})
        context_instance = template.RequestContext(request, current_app=self.admin_site.name)
        return render_to_response(self.delete_confirmation_template or [
            "admin/%s/%s/delete_confirmation.html" % (app_label, opts.object_name.lower()),
            "admin/%s/delete_confirmation.html" % app_label,
            "admin/delete_confirmation.html"
        ], context, context_instance=context_instance)

    def history_view(self, request, object_id, extra_context=None):
        "The 'history' admin view for this model."
        from django.contrib.admin.models import LogEntry
        model = self.model
        opts = model._meta
        app_label = opts.app_label
        action_list = LogEntry.objects.filter(
            object_id = object_id,
            content_type__id__exact = ContentType.objects.get_for_model(model).id
        ).select_related().order_by('action_time')
        # If no history was found, see whether this object even exists.
        obj = get_object_or_404(model, pk=unquote(object_id))
        context = {
            'title': _('Change history: %s') % force_unicode(obj),
            'action_list': action_list,
            'module_name': capfirst(force_unicode(opts.verbose_name_plural)),
            'object': obj,
            'root_path': self.admin_site.root_path,
            'app_label': app_label,
        }
        context.update(extra_context or {})
        context_instance = template.RequestContext(request, current_app=self.admin_site.name)
        return render_to_response(self.object_history_template or [
            "admin/%s/%s/object_history.html" % (app_label, opts.object_name.lower()),
            "admin/%s/object_history.html" % app_label,
            "admin/object_history.html"
        ], context, context_instance=context_instance)

class InlineModelAdmin(BaseModelAdmin):
    """
    Options for inline editing of ``model`` instances.

    Provide ``name`` to specify the attribute name of the ``ForeignKey`` from
    ``model`` to its parent. This is required if ``model`` has more than one
    ``ForeignKey`` to its parent.
    """
    model = None
    fk_name = None
    formset = BaseInlineFormSet
    extra = 3
    max_num = None
    template = None
    verbose_name = None
    verbose_name_plural = None
    can_delete = True

    def __init__(self, parent_model, admin_site):
        self.admin_site = admin_site
        self.parent_model = parent_model
        self.opts = self.model._meta
        super(InlineModelAdmin, self).__init__()
        if self.verbose_name is None:
            self.verbose_name = self.model._meta.verbose_name
        if self.verbose_name_plural is None:
            self.verbose_name_plural = self.model._meta.verbose_name_plural

    def _media(self):
        from django.conf import settings
        js = ['js/jquery.min.js', 'js/jquery.init.js', 'js/inlines.min.js']
        if self.prepopulated_fields:
            js.append('js/urlify.js')
            js.append('js/prepopulate.min.js')
        if self.filter_vertical or self.filter_horizontal:
            js.extend(['js/SelectBox.js' , 'js/SelectFilter2.js'])
        return forms.Media(js=['%s%s' % (settings.ADMIN_MEDIA_PREFIX, url) for url in js])
    media = property(_media)

    def get_formset(self, request, obj=None, **kwargs):
        """Returns a BaseInlineFormSet class for use in admin add/change views."""
        if self.declared_fieldsets:
            fields = flatten_fieldsets(self.declared_fieldsets)
        else:
            fields = None
        if self.exclude is None:
            exclude = []
        else:
            exclude = list(self.exclude)
        exclude.extend(kwargs.get("exclude", []))
        exclude.extend(self.get_readonly_fields(request, obj))
        # if exclude is an empty list we use None, since that's the actual
        # default
        exclude = exclude or None
        defaults = {
            "form": self.form,
            "formset": self.formset,
            "fk_name": self.fk_name,
            "fields": fields,
            "exclude": exclude,
            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
            "extra": self.extra,
            "max_num": self.max_num,
            "can_delete": self.can_delete,
        }
        defaults.update(kwargs)
        return inlineformset_factory(self.parent_model, self.model, **defaults)

    def get_fieldsets(self, request, obj=None):
        if self.declared_fieldsets:
            return self.declared_fieldsets
        form = self.get_formset(request).form
        fields = form.base_fields.keys() + list(self.get_readonly_fields(request, obj))
        return [(None, {'fields': fields})]

class StackedInline(InlineModelAdmin):
    template = 'admin/edit_inline/stacked.html'

class TabularInline(InlineModelAdmin):
    template = 'admin/edit_inline/tabular.html'