# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""Exceptions shared by different cubicweb packages."""

from warnings import warn

from six import PY2, text_type

from logilab.common.decorators import cachedproperty

from yams import ValidationError

# abstract exceptions #########################################################

class CubicWebException(Exception):

    """base class for cubicweb server exception"""

    msg = ""

    def __unicode__(self):

        if self.msg:

            if self.args:

                return self.msg % tuple(self.args)

            else:

                return self.msg

        else:

            return u' '.join(text_type(arg) for arg in self.args)

    def __str__(self):

        res = self.__unicode__()

        if PY2:

            res = res.encode('utf-8')

        return res

class ConfigurationError(CubicWebException):

    """a misconfiguration error"""

class InternalError(CubicWebException):

    """base class for exceptions which should not occur"""

class SecurityError(CubicWebException):

    """base class for cubicweb server security exceptions"""

class RepositoryError(CubicWebException):

    """base class for repository exceptions"""

class SourceException(CubicWebException):

    """base class for source exceptions"""

class CubicWebRuntimeError(CubicWebException):

    """base class for runtime exceptions"""

# repository exceptions #######################################################

class ConnectionError(RepositoryError):

    """raised when a bad connection id is given or when an attempt to establish

    a connection failed

    """

class AuthenticationError(ConnectionError):

    """raised when an attempt to establish a connection failed due to wrong

    connection information (login / password or other authentication token)

    """

class BadConnectionId(ConnectionError):

    """raised when a bad connection id is given"""

class UnknownEid(RepositoryError):

    """the eid is not defined in the system tables"""

    msg = 'No entity with eid %s in the repository'

class UniqueTogetherError(RepositoryError):

    """raised when a unique_together constraint caused an IntegrityError"""

    def __init__(self, session, **kwargs):

        self.session = session

        assert 'rtypes' in kwargs or 'cstrname' in kwargs

        self.kwargs = kwargs

        # fill cache while the session is open

        self.rtypes

    @cachedproperty

    def rtypes(self):

        if 'rtypes' in self.kwargs:

            return self.kwargs['rtypes']

        cstrname = unicode(self.kwargs['cstrname'])

        cstr = self.session.find('CWUniqueTogetherConstraint', name=cstrname).one()

        return sorted(rtype.name for rtype in cstr.relations)

    @cachedproperty

    def args(self):

        warn('[3.18] UniqueTogetherError.args is deprecated, just use '

             'the .rtypes accessor.',

             DeprecationWarning)

        # the first argument, etype, is never used and was never garanteed anyway

        return None, self.rtypes

class ViolatedConstraint(RepositoryError):

    def __init__(self, cnx, cstrname):

        self.cnx = cnx

        self.cstrname = cstrname

# security exceptions #########################################################

class Unauthorized(SecurityError):

    """raised when a user tries to perform an action without sufficient

    credentials

    """

    msg = u'You are not allowed to perform this operation'

    msg1 = u'You are not allowed to perform %s operation on %s'

    var = None

    def __unicode__(self):

        try:

            if self.args and len(self.args) == 2:

                return self.msg1 % self.args

            if self.args:

                return u' '.join(self.args)

            return self.msg

        except Exception as ex:

            return text_type(ex)

class Forbidden(SecurityError):

    """raised when a user tries to perform a forbidden action

    """

# source exceptions ###########################################################

class EidNotInSource(SourceException):

    """trying to access an object with a particular eid from a particular

    source has failed

    """

    msg = 'No entity with eid %s in %s'

# registry exceptions #########################################################

# pre 3.15 bw compat

from logilab.common.registry import RegistryException, ObjectNotFound, NoSelectableObject

class UnknownProperty(RegistryException):

    """property found in database but unknown in registry"""

# query exception #############################################################

class QueryError(CubicWebRuntimeError):

    """a query try to do something it shouldn't"""

class NotAnEntity(CubicWebRuntimeError):

    """raised when get_entity is called for a column which doesn't contain

    a non final entity

    """

class MultipleResultsError(CubicWebRuntimeError):

    """raised when ResultSet.one() is called on a resultset with multiple rows

    of multiple columns.

    """

class NoResultError(CubicWebRuntimeError):

    """raised when no result is found but at least one is expected.

    """

class UndoTransactionException(QueryError):

    """Raised when undoing a transaction could not be performed completely.

    Note that :

      1) the partial undo operation might be acceptable

         depending upon the final application

      2) the undo operation can also fail with a `ValidationError` in

         cases where the undoing breaks integrity constraints checked

         immediately.

      3) It might be that neither of those exception is raised but a

         subsequent `commit` might raise a `ValidationError` in cases

         where the undoing breaks integrity constraints checked at

         commit time.

    :type txuuix: int

    :param txuuid: Unique identifier of the partially undone transaction

    :type errors: list

    :param errors: List of errors occurred during undoing

    """

    msg = u"The following error(s) occurred while undoing transaction #%d : %s"

    def __init__(self, txuuid, errors):

        super(UndoTransactionException, self).__init__(txuuid, errors)

        self.txuuid = txuuid

        self.errors = errors

# tools exceptions ############################################################

class ExecutionError(Exception):

    """server execution control error (already started, not running...)"""

# pylint: disable=W0611

from logilab.common.clcommands import BadCommandUsage