# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 of the
#     License, or (at your option) any later version.

#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.


# This project incorporates work covered by the following copyright and permission notice:  

#    Copyright (c) 2009, Julien Fache
#    All rights reserved.

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#    modification, are permitted provided that the following conditions
#    are met:

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# Copyright (c) 2011,  2012 Free Software Foundation

#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU Affero General Public License as
#     published by the Free Software Foundation, either version 3 of the
#     License, or (at your option) any later version.

#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU Affero General Public License for more details.

#     You should have received a copy of the GNU Affero General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.



"""Signal handlers of Gstudio"""
import inspect
from functools import wraps

from django.db.models.signals import post_save

from gstudio import settings


def disable_for_loaddata(signal_handler):
    """Decorator for disabling signals sent
    by 'post_save' on loaddata command.
    http://code.djangoproject.com/ticket/8399"""

    @wraps(signal_handler)
    def wrapper(*args, **kwargs):
        for fr in inspect.stack():
            if inspect.getmodulename(fr[1]) == 'loaddata':
                return
        signal_handler(*args, **kwargs)

    return wrapper


@disable_for_loaddata
def ping_directories_handler(sender, **kwargs):
    """Ping Directories when a nodetype is saved"""
    nodetype = kwargs['instance']

    if nodetype.is_visible and settings.SAVE_PING_DIRECTORIES:
        from gstudio.ping import DirectoryPinger

        for directory in settings.PING_DIRECTORIES:
            DirectoryPinger(directory, [nodetype])


@disable_for_loaddata
def ping_external_urls_handler(sender, **kwargs):
    """Ping Externals URLS when a nodetype is saved"""
    nodetype = kwargs['instance']

    if nodetype.is_visible and settings.SAVE_PING_EXTERNAL_URLS:
        from gstudio.ping import ExternalUrlsPinger

        ExternalUrlsPinger(nodetype)


def disconnect_gstudio_signals():
    """Disconnect all the signals provided by Gstudio"""
    from gstudio.models import Nodetype

    post_save.disconnect(
        sender=Nodetype, dispatch_uid='gstudio.nodetype.post_save.ping_directories')
    post_save.disconnect(
        sender=Nodetype, dispatch_uid='gstudio.nodetype.post_save.ping_external_urls')