from django.conf import settings
from ldap3 import Server, Connection, ObjectDef, Writer, SUBTREE
import logging

logger = logging.getLogger(__name__)
server = Server(settings.AUTH_LDAP_SERVER_URI)


def create_user(user, password, firstname, lastname, email):
    conn = Connection(server, settings.AUTH_LDAP_BIND_DN,
                      settings.AUTH_LDAP_BIND_PASSWORD)
    if not conn.bind():
        logger.error("conn.bind() returned False. Could not connect.")
        raise Exception('Could not connect to LDAP Server')
    obj_new_user = ObjectDef(['inetOrgPerson', 'posixAccount'], conn)
    uid = settings.get_max_uid() + 1
    results = True
    while results:
        results = conn.search(
            search_base=settings.LDAP_SEARCH_BASE,
            search_filter=(
                '(&(objectClass=inetOrgPerson)(objectClass=posixAccount)'
                '(objectClass=top)(uidNumber={uidNumber}))'.format(
                    uidNumber=uid
                )
            ),
            search_scope=SUBTREE,
            attributes=['uidNumber'],
        )
        if results:
            logger.debug("{uid} exists. Trying next.".format(uid=uid))
            uid += 1
        else:
            logger.debug("{uid} does not exist. Using it".format(uid=uid))

    w = Writer(conn, obj_new_user)
    dn = 'uid=%s,ou=users,dc=ungleich,dc=ch' % user
    w.new(dn)
    w[0].givenName = firstname
    w[0].sn = lastname
    w[0].cn = firstname + " " + lastname
    w[0].mail = email
    w[0].userPassword = password
    w[0].gidNumber = settings.IPV6_WORK_USER_GROUP
    w[0].uidNumber = uid
    w[0].homeDirectory = "/home/" + user

    if not w.commit():
        conn.unbind()
        logger.error("w.commit() returned False. Could not write user.")
        raise Exception("Couldn't write user")
    conn.unbind()
    return True