"""entity classes for optional library entities

:organization: Logilab

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

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

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

from urlparse import urlsplit, urlunsplit

from datetime import datetime

from logilab.common.deprecation import deprecated

from cubicweb import UnknownProperty

from cubicweb.entity import _marker

from cubicweb.entities import AnyEntity, fetch_config

def mangle_email(address):

    try:

        name, host = address.split('@', 1)

    except ValueError:

        return address

    return '%s at %s' % (name, host.replace('.', ' dot '))

class EmailAddress(AnyEntity):

    __regid__ = 'EmailAddress'

    fetch_attrs, fetch_order = fetch_config(['address', 'alias'])

    def dc_title(self):

        if self.alias:

            return '%s <%s>' % (self.alias, self.display_address())

        return self.display_address()

    @property

    def email_of(self):

        return self.reverse_use_email and self.reverse_use_email[0]

    @property

    def prefered(self):

        return self.prefered_form and self.prefered_form[0] or self

    @deprecated('use .prefered')

    def canonical_form(self):

        return self.prefered_form and self.prefered_form[0] or self

    def related_emails(self, skipeids=None):

        # XXX move to eemail

        # check email relations are in the schema first

        subjrels = self.e_schema.object_relations()

        if not ('sender' in subjrels and 'recipients' in subjrels):

            return

        rql = 'DISTINCT Any X, S, D ORDERBY D DESC WHERE X sender Y or X recipients Y, X subject S, X date D, Y eid %(y)s'

        rset = self.req.execute(rql, {'y': self.eid}, 'y')

        if skipeids is None:

            skipeids = set()

        for i in xrange(len(rset)):

            eid = rset[i][0]

            if eid in skipeids:

                continue

            skipeids.add(eid)

            yield rset.get_entity(i, 0)

    def display_address(self):

        if self.vreg.config['mangle-emails']:

            return mangle_email(self.address)

        return self.address

    def printable_value(self, attr, value=_marker, attrtype=None,

                        format='text/html'):

        """overriden to return displayable address when necessary"""

        if attr == 'address':

            return self.display_address()

        return super(EmailAddress, self).printable_value(attr, value, attrtype, format)

    def after_deletion_path(self):

        """return (path, parameters) which should be used as redirect

        information when this entity is being deleted

        """

        if self.email_of:

            return self.email_of.rest_path(), {}

        return super(EmailAddress, self).after_deletion_path()

class Bookmark(AnyEntity):

    """customized class for Bookmark entities"""

    __regid__ = 'Bookmark'

    fetch_attrs, fetch_order = fetch_config(['title', 'path'])

    def actual_url(self):

        url = self.req.build_url(self.path)

        if self.title:

            urlparts = list(urlsplit(url))

            if urlparts[3]:

                urlparts[3] += '&vtitle=%s' % self.req.url_quote(self.title)

            else:

                urlparts[3] = 'vtitle=%s' % self.req.url_quote(self.title)

            url = urlunsplit(urlparts)

        return url

    def action_url(self):

        return self.absolute_url() + '/follow'

class CWProperty(AnyEntity):

    __regid__ = 'CWProperty'

    fetch_attrs, fetch_order = fetch_config(['pkey', 'value'])

    rest_attr = 'pkey'

    def typed_value(self):

        return self.vreg.typed_value(self.pkey, self.value)

    def dc_description(self, format='text/plain'):

        try:

            return self.req._(self.vreg.property_info(self.pkey)['help'])

        except UnknownProperty:

            return u''

    def after_deletion_path(self):

        """return (path, parameters) which should be used as redirect

        information when this entity is being deleted

        """

        return 'view', {}

class CWCache(AnyEntity):

    """Cache"""

    __regid__ = 'CWCache'

    fetch_attrs, fetch_order = fetch_config(['name'])

    def touch(self):

        self.req.execute('SET X timestamp %(t)s WHERE X eid %(x)s',

                         {'t': datetime.now(), 'x': self.eid}, 'x')

    def valid(self, date):

        if date:

            return date > self.timestamp

        return False