"""

Creates permissions for all installed apps that need permissions.

"""

from django.db.models import get_models, signals

from django.contrib.auth import models as auth_app

def _get_permission_codename(action, opts):

    return u'%s_%s' % (action, opts.object_name.lower())

def _get_all_permissions(opts):

    "Returns (codename, name) for all permissions in the given opts."

    perms = []

    for action in ('add', 'change', 'delete'):

        perms.append((_get_permission_codename(action, opts), u'Can %s %s' % (action, opts.verbose_name_raw)))

    return perms + list(opts.permissions)

def create_permissions(app, created_models, verbosity, **kwargs):

    from django.contrib.contenttypes.models import ContentType

    from django.contrib.auth.models import Permission

    app_models = get_models(app)

    if not app_models:

        return

    for klass in app_models:

        ctype = ContentType.objects.get_for_model(klass)

        for codename, name in _get_all_permissions(klass._meta):

            p, created = Permission.objects.get_or_create(codename=codename, content_type__pk=ctype.id,

                defaults={'name': name, 'content_type': ctype})

            if created and verbosity >= 2:

                print "Adding permission '%s'" % p

def create_superuser(app, created_models, verbosity, **kwargs):

    from django.contrib.auth.models import User

    from django.core.management import call_command

    if User in created_models and kwargs.get('interactive', True):

        msg = "\nYou just installed Django's auth system, which means you don't have " \

                "any superusers defined.\nWould you like to create one now? (yes/no): "

        confirm = raw_input(msg)

        while 1:

            if confirm not in ('yes', 'no'):

                confirm = raw_input('Please enter either "yes" or "no": ')

                continue

            if confirm == 'yes':

                call_command("createsuperuser", interactive=True)

            break

signals.post_syncdb.connect(create_permissions,

    dispatch_uid = "django.contrib.auth.management.create_permissions")

signals.post_syncdb.connect(create_superuser,

    sender=auth_app, dispatch_uid = "django.contrib.auth.management.create_superuser")