import ssl
from ldap3.utils.hashed import hashed
from ldap3 import SUBTREE, MODIFY_REPLACE, HASHED_SALTED_SHA512, HASHED_SALTED_MD5
from ldap3.core.exceptions import LDAPPasswordIsMandatoryError, LDAPBindError
from flask import current_app as app
from flask_ldapconn import LDAPConn
from werkzeug.exceptions import BadRequest

from flaschengeist.modules import AuthPlugin
from flaschengeist.system.models.user import User
import flaschengeist.system.controller.userController as userController


class AuthLDAP(AuthPlugin):
    def __init__(self, cfg):
        super().__init__()

        config = {"PORT": 389, "USE_SSL": False}
        config.update(cfg)

        app.config.update(
            LDAP_SERVER=config["URL"],
            LDAP_PORT=config["PORT"],
            LDAP_BINDDN=config["BINDDN"],
            LDAP_USE_TLS=False,
            LDAP_USE_SSL=config["USE_SSL"],
            LDAP_TLS_VERSION=ssl.PROTOCOL_TLSv1_2,
            LDAP_REQUIRE_CERT=ssl.CERT_NONE,
            FORCE_ATTRIBUTE_VALUE_AS_LIST=True,
        )
        if "SECRET" in config:
            app.config["LDAP_SECRET"] = (config["SECRET"],)
        self.ldap = LDAPConn(app)
        self.dn = config["BASEDN"]
        if "ADMIN_DN" in config:
            self.admin_dn = config["ADMIN_DN"]
            self.admin_secret = config["ADMIN_SECRET"]

    def login(self, user, password):
        if not user:
            return False
        return self.ldap.authenticate(user.userid, password, "uid", self.dn)

    def update_user(self, user):
        self.ldap.connection.search(
            "ou=user,{}".format(self.dn),
            "(uid={})".format(user.userid),
            SUBTREE,
            attributes=["uid", "givenName", "sn", "mail"],
        )
        r = self.ldap.connection.response[0]["attributes"]
        if r["uid"][0] == user.userid:
            user.set_attribute("DN", self.ldap.connection.response[0]["dn"])
            user.firstname = r["givenName"][0]
            user.lastname = r["sn"][0]
            if r["mail"]:
                user.mail = r["mail"][0]
            if "displayName" in r:
                user.display_name = r["displayName"][0]
            userController.set_roles(user, self._get_groups(user.userid))

    def _get_groups(self, uid):
        groups = []

        self.ldap.connection.search(
            "ou=user,{}".format(self.dn), "(uid={})".format(uid), SUBTREE, attributes=["gidNumber"]
        )
        main_group_number = self.ldap.connection.response[0]["attributes"]["gidNumber"]
        if main_group_number:
            if type(main_group_number) is list:
                main_group_number = main_group_number[0]
            self.ldap.connection.search(
                "ou=group,{}".format(self.dn), "(gidNumber={})".format(main_group_number), attributes=["cn"]
            )
            groups.append(self.ldap.connection.response[0]["attributes"]["cn"][0])

        self.ldap.connection.search(
            "ou=group,{}".format(self.dn), "(memberUID={})".format(uid), SUBTREE, attributes=["cn"]
        )
        groups_data = self.ldap.connection.response
        for data in groups_data:
            groups.append(data["attributes"]["cn"][0])
        return groups

    def modify_user(self, user: User, password, new_password=None):
        try:
            dn = user.get_attribute("DN")
            if password:
                ldap_conn = self.ldap.connect(dn, password)
            else:
                ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
            modifier = {}
            for name, ldap_name in [
                ("firstname", "givenName"),
                ("lastname", "sn"),
                ("mail", "mail"),
                ("display_name", "displayName"),
            ]:
                if hasattr(user, name):
                    modifier[ldap_name] = [(MODIFY_REPLACE, [getattr(user, name)])]
            if new_password:
                # TODO: Use secure hash!
                salted_password = hashed(HASHED_SALTED_MD5, new_password)
                modifier["userPassword"] = [(MODIFY_REPLACE, [salted_password])]
            ldap_conn.modify(dn, modifier)
        except (LDAPPasswordIsMandatoryError, LDAPBindError):
            raise BadRequest