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

# Copyright (c) 2008 - 2010, Pascal Volk

# See COPYING for distribution information.

"""Virtual Mail Manager's MailLocation class to manage the mail_location

for accounts."""

import re

import VirtualMailManager.constants.ERROR as ERR

from VirtualMailManager.Exceptions import VMMMailLocationException as MLE

RE_MAILLOCATION = """^\w{1,20}$"""

class MailLocation(object):

    """A wrapper class thats provide access to the maillocation table"""

    __slots__ = ('__id', '__maillocation', '_dbh')

    def __init__(self, dbh, mid=None, maillocation=None):

        """Creates a new MailLocation instance.

        Either mid or maillocation must be specified.

        Keyword arguments:

        dbh -- a pyPgSQL.PgSQL.connection

        mid -- the id of a maillocation (long)

        maillocation -- the value of the maillocation (str)

        """

        self._dbh = dbh

        if mid is None and maillocation is None:

            raise MLE(_('Either mid or maillocation must be specified.'),

                ERR.MAILLOCATION_INIT)

        elif mid is not None:

            try:

                self.__id = long(mid)

            except ValueError:

                raise MLE(_('mid must be an int/long.'), ERR.MAILLOCATION_INIT)

            self._loadByID()

        else:

            if re.match(RE_MAILLOCATION, maillocation):

                self.__maillocation = maillocation

                self._loadByName()

            else:

                raise MLE(

                    _(u'Invalid folder name “%s”, it may consist only of\n\

1 - 20 single byte characters (A-Z, a-z, 0-9 and _).') % maillocation,

                        ERR.MAILLOCATION_INIT)

    def _loadByID(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT maillocation FROM maillocation WHERE mid = %s',

                self.__id)

        result = dbc.fetchone()

        dbc.close()

        if result is not None:

            self.__maillocation = result[0]

        else:

            raise MLE(_('Unknown mid specified.'), ERR.UNKNOWN_MAILLOCATION_ID)

    def _loadByName(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT mid FROM maillocation WHERE maillocation = %s',

                self.__maillocation)

        result = dbc.fetchone()

        dbc.close()

        if result is not None:

            self.__id = result[0]

        else:

            self._save()

    def _save(self):

        dbc = self._dbh.cursor()

        dbc.execute("SELECT nextval('maillocation_id')")

        self.__id = dbc.fetchone()[0]

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

                self.__id, self.__maillocation)

        self._dbh.commit()

        dbc.close()

    def getID(self):

        """Returns the unique ID of the maillocation."""

        return self.__id

    def getMailLocation(self):

        """Returns the value of maillocation, ex: 'Maildir'"""

        return self.__maillocation