import glob
import logging
import os
from email.headerregistry import Address
from typing import Any, Dict, List, Optional

from django.conf import settings

from zerver.lib.storage import static_path

# See https://jackstromberg.com/2013/01/useraccountcontrol-attributeflag-values/
# for docs on what these values mean.
LDAP_USER_ACCOUNT_CONTROL_NORMAL = "512"
LDAP_USER_ACCOUNT_CONTROL_DISABLED = "514"


def generate_dev_ldap_dir(mode: str, num_users: int = 8) -> Dict[str, Dict[str, Any]]:
    mode = mode.lower()
    ldap_data = []
    for i in range(1, num_users + 1):
        name = f"LDAP User {i}"
        email = f"ldapuser{i}@zulip.com"
        phone_number = f"999999999{i}"
        birthdate = f"19{i:02}-{i:02}-{i:02}"
        ldap_data.append((name, email, phone_number, birthdate))

    profile_images = []
    for path in glob.glob(os.path.join(static_path("images/test-images/avatars"), "*")):
        with open(path, "rb") as f:
            profile_images.append(f.read())
    ldap_dir = {}
    for i, user_data in enumerate(ldap_data):
        email = user_data[1].lower()
        email_username = Address(addr_spec=email).username
        common_data = {
            "cn": [user_data[0]],
            "userPassword": [email_username],
            "phoneNumber": [user_data[2]],
            "birthDate": [user_data[3]],
        }
        if mode == "a":
            ldap_dir[f"uid={email},ou=users,dc=zulip,dc=com"] = dict(
                uid=[email],
                thumbnailPhoto=[profile_images[i % len(profile_images)]],
                userAccountControl=[LDAP_USER_ACCOUNT_CONTROL_NORMAL],
                **common_data,
            )
        elif mode == "b":
            ldap_dir[f"uid={email_username},ou=users,dc=zulip,dc=com"] = dict(
                uid=[email_username],
                jpegPhoto=[profile_images[i % len(profile_images)]],
                **common_data,
            )
        elif mode == "c":
            ldap_dir[f"uid={email_username},ou=users,dc=zulip,dc=com"] = dict(
                uid=[email_username], email=[email], **common_data
            )

    return ldap_dir


def init_fakeldap(
    directory: Optional[Dict[str, Dict[str, List[str]]]] = None
) -> None:  # nocoverage
    # We only use this in development.  Importing mock inside
    # this function is an import time optimization, which
    # avoids the expensive import of the mock module (slow
    # because its dependency pbr uses pkgresources, which is
    # really slow to import.)
    from unittest import mock

    from fakeldap import MockLDAP

    # Silent `django_auth_ldap` logger in dev mode to avoid
    # spammy user not found log messages.
    ldap_auth_logger = logging.getLogger("django_auth_ldap")
    ldap_auth_logger.setLevel(logging.CRITICAL)

    fakeldap_logger = logging.getLogger("fakeldap")
    fakeldap_logger.setLevel(logging.CRITICAL)

    ldap_patcher = mock.patch("django_auth_ldap.config.ldap.initialize")
    mock_initialize = ldap_patcher.start()
    mock_ldap = MockLDAP()
    mock_initialize.return_value = mock_ldap

    assert settings.FAKE_LDAP_MODE is not None
    mock_ldap.directory = directory or generate_dev_ldap_dir(
        settings.FAKE_LDAP_MODE, settings.FAKE_LDAP_NUM_USERS
    )