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

# Copyright 2007-2008 VEB IT

# See COPYING for distribution information.

# $Id$

"""Virtual Mail Manager's Alias class to manage e-mail aliases."""

from constants.VERSION import VERSION

__author__ = 'Pascal Volk <p.volk@veb-it.de>'

__version__ = VERSION

__revision__ = 'rev '+'$Rev$'.split()[1]

__date__ = '$Date$'.split()[1]

from Exceptions import VMMAliasException as VMMAE

from Domain import Domain

from EmailAddress import EmailAddress

import constants.ERROR as ERR

import VirtualMailManager as VMM

class Alias:

    """Class to manage e-mail aliases."""

    def __init__(self, dbh, address, destination=None):

        if isinstance(address, EmailAddress):

            self._addr = address

        else:

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

        if destination is None:

            self._dest = None

        elif isinstance(destination, EmailAddress):

            self._dest = destination

        else:

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

        if address == destination:

            raise VMMAE(_(u"Address and destination are identical."),

                ERR.ALIAS_ADDR_DEST_IDENTICAL)

        self._dbh = dbh

        self._gid = 0

        self._isNew = False

        self._setAddr()

        if not self._dest is None:

            self._exists()

        if self._isNew and VMM.VirtualMailManager.accountExists(self._dbh,

                self._addr):

            raise VMMAE(_(u"There is already an account with address »%s«.") %\

                    self._addr, ERR.ACCOUNT_EXISTS)

        if self._isNew and VMM.VirtualMailManager.relocatedExists(self._dbh,

                self._addr):

            raise VMMAE(

              _(u"There is already a relocated user with the address »%s«.") %\

                    self._addr, ERR.RELOCATED_EXISTS)

    def _exists(self):

        dbc = self._dbh.cursor()

        dbc.execute("SELECT gid FROM alias WHERE gid=%s AND address=%s\

 AND destination=%s", self._gid, self._addr._localpart, str(self._dest))

        gid = dbc.fetchone()

        dbc.close()

        if gid is None:

            self._isNew = True

    def _setAddr(self):

        dom = Domain(self._dbh, self._addr._domainname)

        self._gid = dom.getID()

        if self._gid == 0:

            raise VMMAE(_(u"The domain »%s« doesn't exist yet.") %\

                    self._addr._domainname, ERR.NO_SUCH_DOMAIN)

        if self._dest is None:

           raise VMMAE(_(u"No destination address for alias denoted."),

               ERR.ALIAS_MISSING_DEST)

        if self._isNew:

            dbc = self._dbh.cursor()

            dbc.execute("INSERT INTO alias (gid, address, destination) VALUES\

 (%s, %s, %s)", self._gid, self._addr._localpart, str(self._dest))

            self._dbh.commit()

            dbc.close()

        else:

            raise VMMAE(

               _(u"The alias »%(a)s« with destination »%(d)s« already exists.")\

                       % {'a': self._addr, 'd': self._dest}, ERR.ALIAS_EXISTS)

    def getInfo(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT destination FROM alias WHERE gid=%s AND address=%s',

                self._gid, self._addr._localpart)

        destinations = dbc.fetchall()

        dbc.close()

        if len(destinations) > 0:

            targets = []

            for destination in destinations:

                targets.append(destination[0])

            return targets

        else:

            raise VMMAE(_(u"The alias »%s« doesn't exists.") % self._addr,

                    ERR.NO_SUCH_ALIAS)

    def delete(self):

        dbc = self._dbh.cursor()

        if self._dest is None:

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

                    self._gid, self._addr._localpart)

        else:

            dbc.execute("DELETE FROM alias WHERE gid=%s AND address=%s AND \

 destination=%s", self._gid, self._addr._localpart, str(self._dest))

        rowcount = dbc.rowcount

        dbc.close()

        if rowcount > 0:

            self._dbh.commit()

        else:

            if self._dest is None:

                msg = u"The alias »%s« doesn't exists." % self._addr

            else:

                msg = u"The alias »%(a)s« with destination »%(d)s« doesn't\

 exists." % {'a': self._addr, 'd': self._dest}

            raise VMMAE(_(msg), ERR.NO_SUCH_ALIAS)