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

relations between entitites.

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

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

"""

__docformat__ = "restructuredtext en"

from cubicweb.__pkginfo__ import version as __version__

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 urllib import quote as urlquote, unquote as urlunquote

from logilab.common.decorators import cached

def set_log_methods(cls, logger):

    """bind standart logger's methods as static methods on the class

    """

    cls._logger = logger

    for attr in ('debug', 'info', 'warning', 'error', 'critical', 'exception'):

        setattr(cls, attr, getattr(logger, attr))

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

    logging.basicConfig(level=logging.CRITICAL)

else:

    logging.basicConfig()

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)

class RequestSessionMixIn(object):

    """mixin class containing stuff shared by server session and web request

    """

    def __init__(self, vreg):

        self.vreg = vreg

        try:

            encoding = vreg.property_value('ui.encoding')

        except: # no vreg or property not registered

            encoding = 'utf-8'

        self.encoding = encoding

        # cache result of execution for (rql expr / eids),

        # should be emptied on commit/rollback of the server session / web 

        # connection

        self.local_perm_cache = {}

    def property_value(self, key):

        if self.user:

            return self.user.property_value(key)

        return self.vreg.property_value(key)

    def etype_rset(self, etype, size=1):

        """return a fake result set for a particular entity type"""

        from cubicweb.rset import ResultSet

        rset = ResultSet([('A',)]*size, '%s X' % etype,

                         description=[(etype,)]*size)

        def get_entity(row, col=0, etype=etype, req=self, rset=rset):

            return req.vreg.etype_class(etype)(req, rset, row, col)

        rset.get_entity = get_entity

        return self.decorate_rset(rset)

    def eid_rset(self, eid, etype=None):

        """return a result set for the given eid without doing actual query

        (we have the eid, we can suppose it exists and user has access to the

        entity)

        """

        from cubicweb.rset import ResultSet

        eid = typed_eid(eid)

        if etype is None:

            etype = self.describe(eid)[0]

        rset = ResultSet([(eid,)], 'Any X WHERE X eid %(x)s', {'x': eid},

                         [(etype,)])

        return self.decorate_rset(rset)

    def entity_from_eid(self, eid, etype=None):

        rset = self.eid_rset(eid, etype)

        if rset:

            return rset.get_entity(0, 0)

        else:

            return None

    # url generation methods ##################################################

    def build_url(self, method, base_url=None, **kwargs):

        """return an absolute URL using params dictionary key/values as URL

        parameters. Values are automatically URL quoted, and the

        publishing method to use may be specified or will be guessed.

        """

        if base_url is None:

            base_url = self.base_url()

        if '_restpath' in kwargs:

            assert method == 'view', method

            path = kwargs.pop('_restpath')

        else:

            path = method

        if not kwargs:

            return u'%s%s' % (base_url, path)

        return u'%s%s?%s' % (base_url, path, self.build_url_params(**kwargs))

    def build_url_params(self, **kwargs):

        """return encoded params to incorporate them in an URL"""

        args = []

        for param, values in kwargs.items():

            if not isinstance(values, (list, tuple)):

                values = (values,)

            for value in values:

                args.append(u'%s=%s' % (param, self.url_quote(value)))

        return '&'.join(args)

    def url_quote(self, value, safe=''):

        """urllib.quote is not unicode safe, use this method to do the

        necessary encoding / decoding. Also it's designed to quote each

        part of a url path and so the '/' character will be encoded as well.

        """

        if isinstance(value, unicode):

            quoted = urlquote(value.encode(self.encoding), safe=safe)

            return unicode(quoted, self.encoding)

        return urlquote(str(value), safe=safe)

    def url_unquote(self, quoted):

        """returns a unicode unquoted string

        decoding is based on `self.encoding` which is the encoding

        used in `url_quote`

        """

        if isinstance(quoted, unicode):

            quoted = quoted.encode(self.encoding)

        try:

            return unicode(urlunquote(quoted), self.encoding)

        except UnicodeDecodeError: # might occurs on manually typed URLs

            return unicode(urlunquote(quoted), 'iso-8859-1')

    # session's user related methods #####################################

    @cached

    def user_data(self):

        """returns a dictionnary with this user's information"""

        userinfo = {}

        if self.is_internal_session:

            userinfo['login'] = "cubicweb"

            userinfo['name'] = "cubicweb"

            userinfo['email'] = ""

            return userinfo

        user = self.actual_session().user

        rql = "Any F,S,A where U eid %(x)s, U firstname F, U surname S, U primary_email E, E address A"

        try:

            firstname, lastname, email = self.execute(rql, {'x': user.eid}, 'x')[0]

            if firstname is None and lastname is None:

                userinfo['name'] = ''

            else:

                userinfo['name'] = ("%s %s" % (firstname, lastname))

            userinfo['email'] = email

        except IndexError:

            userinfo['name'] = None

            userinfo['email'] = None

        userinfo['login'] = user.login

        return userinfo

    def is_internal_session(self):

        """overrided on the server-side"""

        return False

    # abstract methods to override according to the web front-end #############

    def base_url(self):

        """return the root url of the application"""

        raise NotImplementedError

    def decorate_rset(self, rset):

        """add vreg/req (at least) attributes to the given result set """

        raise NotImplementedError

    def describe(self, eid):

        """return a tuple (type, sourceuri, extid) for the entity with id <eid>"""

        raise NotImplementedError

# XXX 2.45 is allowing nicer entity type names, use this map for bw compat    

                  'Emailaddress': 'EmailAddress',

                  'Rqlexpression': 'RQLExpression',

                  'Trinfo': 'TrInfo',

                  }

# XXX cubic web cube migration map

CW_MIGRATION_MAP = {'erudi': 'cubicweb',

                    'eaddressbook': 'addressbook',

                    'ebasket': 'basket',

                    'eblog': 'blog',

                    'ebook': 'book',

                    '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',

                    'eclassschemes': 'keyword',

                    'eclassfolders': 'folder',

                    'eclasstags': 'tag',

                    'jpl': 'jpl',

                    'jplintra': 'jplintra',

                    'jplextra': 'jplextra',

                    'jplorg': 'jplorg',

                    'jplrecia': 'jplrecia',

                    'crm': 'crm',

                    'agueol': 'agueol',

                    'docaster': 'docaster',

                    'asteretud': 'asteretud',

                    }

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)