from flask import current_app
from flask_ldap3_login import LDAP3LoginManager, AuthenticationResponseStatus
from werkzeug.middleware.proxy_fix import ProxyFix
import config

def init_ldap(app):
    app.config['LDAP_HOST'] = config.LDAP_HOST
    app.config['LDAP_PORT'] = config.LDAP_PORT
    app.config['LDAP_USE_SSL'] = config.LDAP_USE_SSL
    app.config['LDAP_BASE_DN'] = config.LDAP_BASE_DN
    app.config['LDAP_BIND_DIRECT_CREDENTIALS'] = False
    app.config['LDAP_BIND_USER_DN'] = config.LDAP_BIND_USER_DN
    app.config['LDAP_BIND_USER_PASSWORD'] = config.LDAP_USER_PASSWORD
    app.config['LDAP_USER_DN'] = config.LDAP_USER_DN
    app.config['LDAP_USER_PASSWORD'] = config.LDAP_USER_PASSWORD
    app.config['LDAP_USER_OBJECT_FILTER'] = config.LDAP_USER_OBJECT_FILTER
    app.config['LDAP_USER_LOGIN_ATTR'] = config.LDAP_USER_LOGIN_ATTR
    app.config['LDAP_USER_SEARCH_SCOPE'] = config.LDAP_USER_SEARCH_SCOPE
    app.config['LDAP_SCHEMA'] = config.LDAP_SCHEMA

    ldap_manager = LDAP3LoginManager(app)
    app.extensions['ldap3_login'] = ldap_manager
    ldap_manager.init_app(app)
    app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1)

def authenticate_user(username, password):
    ldap_manager = current_app.extensions['ldap3_login']
    response = ldap_manager.authenticate(username, password)
    if response.status == AuthenticationResponseStatus.success:
        return True, response.user_info, None
    elif response.status == AuthenticationResponseStatus.fail:
        return False, None, "Invalid username or password."
    else:
        return False, None, f"LDAP Error: {response.status}"

def parse_ldap_user(user_info):
    def get(attr):
        value = user_info.get(attr)
        if isinstance(value, list) and value:
            return str(value[0])
        elif value:
            return str(value)
        else:
            return None

    return {
        'sam_account_name': get("sAMAccountName"),
        'email': get("mail"),
        'user_name': get("givenName"),
        'user_middle_name': get("middleName"),
        'user_surname': get("sn"),
    }