# -*- coding: UTF-8 -*-

# Copyright (c) 2008 - 2010, Pascal Volk

# See COPYING for distribution information.

"""

    VirtualMailManager.Relocated

    Virtual Mail Manager's Relocated class to handle relocated users.

"""

from VirtualMailManager.Domain import get_gid

from VirtualMailManager.EmailAddress import EmailAddress

from VirtualMailManager.Exceptions import VMMRelocatedException as VMMRE

from VirtualMailManager.constants.ERROR import \

     NO_SUCH_RELOCATED, RELOCATED_ADDR_DEST_IDENTICAL, RELOCATED_EXISTS

_ = lambda msg: msg

class Relocated(object):

    """Class to handle e-mail addresses of relocated users."""

    __slots__ = ('_addr', '_dest', '_gid', '_dbh')

    def __init__(self, dbh, address):

        """Creates a new *Relocated* instance. The ``address`` is the

        old e-mail address of the user.

        Use `setDestination()` to set/update the new address, where the

        user has moved to."""

        if not isinstance(address, EmailAddress):

            raise TypeError("Argument 'address' is not an EmailAddress")

        self._addr = address

        self._dbh = dbh

        self._gid = get_gid(self._dbh, self._addr.domainname)

        self._dest = None

        self.__load()

    def __load(self):

        """Loads the destination address from the database into the

        `_dest` attribute."""

        dbc = self._dbh.cursor()

        dbc.execute(

            'SELECT destination FROM relocated WHERE gid=%s AND address=%s',

                    self._gid, self._addr.localpart)

        destination = dbc.fetchone()

        dbc.close()

        if destination:

            self._dest = EmailAddress(destination[0])

    def setDestination(self, destination):

        """Sets/updates the new address of the relocated user."""

        update = False

        if not isinstance(destination, EmailAddress):

            raise TypeError("Argument 'destination' is not an EmailAddress")

        if self._addr == destination:

            raise VMMRE(_(u'Address and destination are identical.'),

                        RELOCATED_ADDR_DEST_IDENTICAL)

        if self._dest:

            if self._dest == destination:

                raise VMMRE(_(u'The relocated user %r already exists.') %

                            self._addr, RELOCATED_EXISTS)

            else:

                self._dest = destination

                update = True

        else:

            self._dest = destination

        dbc = self._dbh.cursor()

        if not update:

            dbc.execute('INSERT INTO relocated VALUES (%s, %s, %s)',

                        self._gid, self._addr.localpart, str(self._dest))

        else:

            dbc.execute('UPDATE relocated SET destination=%s \

WHERE gid=%s AND address=%s',

                        str(self._dest), self._gid, self._addr.localpart)

        self._dbh.commit()

        dbc.close()

    def getInfo(self):

        """Returns the address to which mails should be sent."""

        if not self._dest:

            raise VMMRE(_(u"The relocated user %r doesn't exist.") %

                        self._addr, NO_SUCH_RELOCATED)

        return self._dest

    def delete(self):

        """Deletes the relocated entry from the database."""

        if not self._dest:

            raise VMMRE(_(u"The relocated user %r doesn't exist.") %

                        self._addr, NO_SUCH_RELOCATED)

        dbc = self._dbh.cursor()

        dbc.execute("DELETE FROM relocated WHERE gid = %s AND address = %s",

                    self._gid, self._addr.localpart)

        if dbc.rowcount > 0:

            self._dbh.commit()

        dbc.close()

        self._dest = None

del _