# -*- coding: UTF-8 -*-
# Copyright (c) 2008 - 2009, VEB IT
# See COPYING for distribution information.

"""Virtual Mail Manager's Relocated class to manage relocated users."""

from __main__ import ERR
from Exceptions import VMMRelocatedException as VMMRE
from Domain import Domain
from EmailAddress import EmailAddress
import VirtualMailManager as VMM

class Relocated(object):
    """Class to manage e-mail addresses of relocated users."""
    __slots__ = ('_addr', '_dest', '_gid', '_isNew', '_dbh')
    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 VMMRE(_(u"Address and destination are identical."),
                ERR.RELOCATED_ADDR_DEST_IDENTICAL)
        self._dbh = dbh
        self._gid = 0
        self._isNew = False
        self._setAddr()
        self._exists()
        if self._isNew and VMM.VirtualMailManager.accountExists(self._dbh,
                self._addr):
            raise VMMRE(_(u"There is already an account with address “%s”.") %\
                    self._addr, ERR.ACCOUNT_EXISTS)
        if self._isNew and VMM.VirtualMailManager.aliasExists(self._dbh,
                self._addr):
            raise VMMRE(
                    _(u"There is already an alias with the address “%s”.") %\
                    self._addr, ERR.ALIAS_EXISTS)

    def _exists(self):
        dbc = self._dbh.cursor()
        dbc.execute("SELECT gid FROM relocated WHERE gid = %s AND address = %s",
                self._gid, self._addr._localpart)
        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 VMMRE(_(u"The domain “%s” doesn't exist yet.") %\
                    self._addr._domainname, ERR.NO_SUCH_DOMAIN)

    def save(self):
        if self._dest is None:
           raise VMMRE(_(u"No destination address for relocated user denoted."),
               ERR.RELOCATED_MISSING_DEST)
        if self._isNew:
            dbc = self._dbh.cursor()
            dbc.execute("INSERT INTO relocated VALUES (%s, %s, %s)",
                    self._gid, self._addr._localpart, str(self._dest))
            self._dbh.commit()
            dbc.close()
        else:
            raise VMMRE(
                    _(u"The relocated user “%s” already exists.") % self._addr,
                    ERR.RELOCATED_EXISTS)

    def getInfo(self):
        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 is not None:
            return destination[0]
        else:
            raise VMMRE(
                    _(u"The relocated user “%s” doesn't exists.") % self._addr,
                    ERR.NO_SUCH_RELOCATED)

    def delete(self):
        dbc = self._dbh.cursor()
        dbc.execute("DELETE FROM relocated WHERE gid = %s AND address = %s",
                self._gid, self._addr._localpart)
        rowcount = dbc.rowcount
        dbc.close()
        if rowcount > 0:
            self._dbh.commit()
        else:
            raise VMMRE(
                    _(u"The relocated user “%s” doesn't exists.") % self._addr,
                    ERR.NO_SUCH_RELOCATED)