"""

Built-in, globally-available admin actions.

"""

from django import template

from django.core.exceptions import PermissionDenied

from django.contrib.admin import helpers

from django.contrib.admin.util import get_deleted_objects, model_ngettext

from django.shortcuts import render_to_response

from django.utils.encoding import force_unicode

from django.utils.html import escape

from django.utils.safestring import mark_safe

from django.utils.text import capfirst

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

try:

    set

except NameError:

    from sets import Set as set     # Python 2.3 fallback

def delete_selected(modeladmin, request, queryset):

    """

    Default action which deletes the selected objects.

    This action first displays a confirmation page whichs shows all the

    deleteable objects, or, if the user has no permission one of the related

    childs (foreignkeys), a "permission denied" message.

    Next, it delets all selected objects and redirects back to the change list.

    """

    opts = modeladmin.model._meta

    app_label = opts.app_label

    # Check that the user has delete permission for the actual model

    if not modeladmin.has_delete_permission(request):

        raise PermissionDenied

    # Populate deletable_objects, a data structure of all related objects that

    # will also be deleted.

    # deletable_objects must be a list if we want to use '|unordered_list' in the template

    deletable_objects = []

    perms_needed = set()

    i = 0

    for obj in queryset:

        deletable_objects.append([mark_safe(u'%s: <a href="%s/">%s</a>' % (escape(force_unicode(capfirst(opts.verbose_name))), obj.pk, escape(obj))), []])

        get_deleted_objects(deletable_objects[i], perms_needed, request.user, obj, opts, 1, modeladmin.admin_site, levels_to_root=2)

        i=i+1

    # The user has already confirmed the deletion.

    # Do the deletion and return a None to display the change list view again.

    if request.POST.get('post'):

        if perms_needed:

            raise PermissionDenied

        n = queryset.count()

        if n:

            for obj in queryset:

                obj_display = force_unicode(obj)

                modeladmin.log_deletion(request, obj, obj_display)

            queryset.delete()

            modeladmin.message_user(request, _("Successfully deleted %(count)d %(items)s.") % {

                "count": n, "items": model_ngettext(modeladmin.opts, n)

            })

        # Return None to display the change list page again.

        return None

    context = {

        "title": _("Are you sure?"),

        "object_name": force_unicode(opts.verbose_name),

        "deletable_objects": deletable_objects,

        'queryset': queryset,

        "perms_lacking": perms_needed,

        "opts": opts,

        "root_path": modeladmin.admin_site.root_path,

        "app_label": app_label,

        'action_checkbox_name': helpers.ACTION_CHECKBOX_NAME,

    }

    # Display the confirmation page

    return render_to_response(modeladmin.delete_confirmation_template or [

        "admin/%s/%s/delete_selected_confirmation.html" % (app_label, opts.object_name.lower()),

        "admin/%s/delete_selected_confirmation.html" % app_label,

        "admin/delete_selected_confirmation.html"

    ], context, context_instance=template.RequestContext(request))

delete_selected.short_description = ugettext_lazy("Delete selected %(verbose_name_plural)s")