"""CubicWeb is a generic framework to quickly build applications which describes

relations between entitites.

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: Library General Public License version 2 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

import __builtin__

# '_' is available in builtins to mark internationalized string but should

# not be used to do the actual translation

if not hasattr(__builtin__, '_'):

    __builtin__._ = unicode

CW_SOFTWARE_ROOT = __path__[0]

import sys, os, logging

from StringIO import StringIO

from logilab.common.logging_ext import set_log_methods

if os.environ.get('APYCOT_ROOT'):

    logging.basicConfig(level=logging.CRITICAL)

else:

    logging.basicConfig()

from cubicweb.__pkginfo__ import version as __version__

set_log_methods(sys.modules[__name__], logging.getLogger('cubicweb'))

# make all exceptions accessible from the package

from cubicweb._exceptions import *

# convert eid to the right type, raise ValueError if it's not a valid eid

typed_eid = int

#def log_thread(f, w, a):

#    print f.f_code.co_filename, f.f_code.co_name

#import threading

#threading.settrace(log_thread)

class Binary(StringIO):

    """customize StringIO to make sure we don't use unicode"""

    def __init__(self, buf=''):

        assert isinstance(buf, (str, buffer)), \

               "Binary objects must use raw strings, not %s" % buf.__class__

        StringIO.__init__(self, buf)

    def write(self, data):

        assert isinstance(data, (str, buffer)), \

               "Binary objects must use raw strings, not %s" % data.__class__

        StringIO.write(self, data)

# use this dictionary for renaming of entity types while keeping bw compat

ETYPE_NAME_MAP = {# 3.2 migration

                  'ECache': 'CWCache',

                  'EUser': 'CWUser',

                  'EGroup': 'CWGroup',

                  'EProperty': 'CWProperty',

                  'EFRDef': 'CWAttribute',

                  'ENFRDef': 'CWRelation',

                  'ERType': 'CWRType',

                  'EEType': 'CWEType',

                  'EConstraintType': 'CWConstraintType',

                  'EConstraint': 'CWConstraint',

                  'EPermission': 'CWPermission',

                  }

# XXX cubic web cube migration map

CW_MIGRATION_MAP = {'erudi': 'cubicweb',

                    'eaddressbook': 'addressbook',

                    'ebasket': 'basket',

                    'eblog': 'blog',

                    'ebook': 'book',

                    'eclassschemes': 'keyword',

                    'eclassfolders': 'folder',

                    'eclasstags': 'tag',

                    'ecomment': 'comment',

                    'ecompany': 'company',

                    'econference':  'conference',

                    'eemail': 'email',

                    'eevent': 'event',

                    'eexpense': 'expense',

                    'efile': 'file',

                    'einvoice': 'invoice',

                    'elink': 'link',

                    'emailinglist': 'mailinglist',

                    'eperson': 'person',

                    'eshopcart': 'shopcart',

                    'eskillmat': 'skillmat',

                    'etask': 'task',

                    'eworkcase': 'workcase',

                    'eworkorder': 'workorder',

                    'ezone': 'zone',

                    'i18ncontent': 'i18ncontent',

                    'svnfile': 'vcsfile',

                    }

def neg_role(role):

    if role == 'subject':

        return 'object'

    return 'subject'

def role(obj):

    try:

        return obj.role

    except AttributeError:

        return neg_role(obj.target)

def target(obj):

    try:

        return obj.target

    except AttributeError:

        return neg_role(obj.role)

class CubicWebEventManager(object):

    """simple event / callback manager.

    Typical usage to register a callback::

      >>> from cubicweb import CW_EVENT_MANAGER

      >>> CW_EVENT_MANAGER.bind('after-registry-reload', mycallback)

    Typical usage to emit an event::

      >>> from cubicweb import CW_EVENT_MANAGER

      >>> CW_EVENT_MANAGER.emit('after-registry-reload')

    emit() accepts an additional context parameter that will be passed

    to the callback if specified (and only in that case)

    """

    def __init__(self):

        self.callbacks = {}

    def bind(self, event, callback, *args, **kwargs):

        self.callbacks.setdefault(event, []).append( (callback, args, kwargs) )

    def emit(self, event, context=None):

        for callback, args, kwargs in self.callbacks.get(event, ()):

            if context is None:

                callback(*args, **kwargs)

            else:

                callback(context, *args, **kwargs)

CW_EVENT_MANAGER = CubicWebEventManager()

def onevent(event):

    """decorator to ease event / callback binding

    >>> from cubicweb import onevent

    >>> @onevent('before-registry-reload')

    ... def mycallback():

    ...     print 'hello'

    ...

    >>>

    """

    def _decorator(func):

        CW_EVENT_MANAGER.bind(event, func)

        return func

    return _decorator