import logging
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_security.models import fsqla_v2 as fsqla
from flask_security import Security, SQLAlchemyUserDatastore, hash_password
from email_validator import validate_email

import ldap3

from pathlib import Path

from .webapp import door_app
from .door_handle import DoorHandle
from .auth import ExtendedLoginForm

security = Security()


# create admin users (only if they don't exists already)
def create_super_admins(app, db, user_datastore, logger):
    # setup user database when starting the app
    with app.app_context():
        new_admin_data = []
        if app.config['ADMIN_FILE'] is not None:
            if not Path(app.config['ADMIN_FILE']).exists():
                logger.warning(
                    f"Admin user creation file not found at {app.config['ADMIN_FILE']}")
            else:
                # store data for new admins in memory s.t. the file can be deleted afterwards
                with open(app.config['ADMIN_FILE']) as f:
                    for i, line in enumerate(f.readlines()):
                        if not line.strip().startswith('#'):
                            try:
                                user, email, pw = line.split()
                                validate_email(email)
                                new_admin_data.append(
                                    {'username': user, 'email': email,
                                     'password': pw})
                            except Exception as e:
                                print(
                                    f"Error while parsing line {i} in admin config file. Config file should contain lines of "
                                    f"'<username> <email> <password>\\n'\n Exception: {e}\nAdmin account could not be created.")

        db.create_all()
        super_admin_role = user_datastore.find_or_create_role(
            'super_admin')  # root admin = can create other admins
        admin_role = user_datastore.find_or_create_role(
            'admin')  # 'normal' admin
        local_role = user_datastore.find_or_create_role(
            'local')  # LDAP user or local user

        for d in new_admin_data:
            if user_datastore.find_user(email=d['email'],
                                        username=d['username']) is None:
                roles = [super_admin_role, admin_role]
                if not d['password'] == 'LDAP':
                    roles.append(local_role)
                logger.info(
                    f"New super admin user created with username '{d['username']}' and email '{d['email']}', roles = {[r.name for r in roles]}")

                # create new admin (only if admin does not already exist)
                new_admin = user_datastore.create_user(email=d['email'],
                                                       username=d[
                                                           'username'],
                                                       password=hash_password(
                                                           d['password']),
                                                       roles=roles)
        db.session.commit()

def setup_logging(app):
    # set up logging for the web app
    logger = logging.getLogger('webapp')
    logger.setLevel(logging.INFO)

    if app.config['LOG_FILE'] is not None:
        ch = logging.FileHandler(app.config['LOG_FILE'])
        ch.setLevel(logging.INFO)
    else:
        # create console handler and set level to debug
        ch = logging.StreamHandler()
        ch.setLevel(logging.DEBUG)

    # create formatter
    formatter = logging.Formatter(
        '%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    # add formatter to ch
    ch.setFormatter(formatter)
    # add ch to logger
    logger.addHandler(ch)

    return logger

def create_app():
    app = Flask(__name__)
    app.config.from_object('imaginaerraum_door_admin.default_app_config.DefaultConfig')
    app.config.from_envvar('APPLICATION_SETTINGS')

    logger = setup_logging(app)

    # do some checks for file existence etc.
    try:
        with open(app.config['KEY_FILE']) as f:
            data = f.readlines()
            if 'SECRET_KEY' in data[0]:
                secret_key = data[0].split()[-1]
            else:
                raise Exception("Could not read SECURITY_PASSWORD_SALT")
            if 'SECURITY_PASSWORD_SALT' in data[1]:
                security_password_salt = data[1].split()[-1]
            else:
                raise Exception("Could not read SECURITY_PASSWORD_SALT")
    except Exception as e:
        logger.warning(
            f"Flask keys could not be read from file at {Path(app.config['KEY_FILE']).absolute()}. Exception: {e}. Using default values instead.")
        secret_key = 'Q7PJu2fg2jabYwP-Psop6c6f2G4'
        security_password_salt = '10036796768252925167749545152988277953'

    if Path(app.config['TEMPLATE_FOLDER']).is_absolute():
        if not Path(app.config['TEMPLATE_FOLDER']).exists():
            logger.error(
                f"Flask template folder not found at {Path(app.config['TEMPLATE_FOLDER']).absolute()}")
    else:
        if not (Path(__file__).parent / app.config['TEMPLATE_FOLDER']).exists():
            logger.error(
                f"Flask template folder not found at {(Path(__file__).parent / app.config['TEMPLATE_FOLDER']).absolute()}")
    if Path(app.config['STATIC_FOLDER']).is_absolute():
        if not Path(app.config['STATIC_FOLDER']).exists():
            logger.error(
                f"Flask static folder not found at {Path(app.config['STATIC_FOLDER']).absolute()}")
    else:
        if not (Path(__file__).parent / app.config['STATIC_FOLDER']).exists():
            logger.error(
                f"Flask static folder not found at {(Path(__file__).parent / app.config['STATIC_FOLDER']).absolute()}")
    if not Path(app.config['TOKEN_FILE']).exists():
        logger.warning(
            f"Token file not found at {Path(app.config['TOKEN_FILE']).absolute()}")

    # create door objects which provides access to the token file and current door state via MQTT
    app.door = DoorHandle(token_file=app.config['TOKEN_FILE'], mqtt_host=app.config['MQTT_HOST'],
                      nfc_socket=app.config['NFC_SOCKET'],
                      logger=logger)

    # Mail Config
    #mail = Mail(app)

    from . import webapp
    #app.register_blueprint

    # Create database connection object
    db = SQLAlchemy(app)

    # Define models
    fsqla.FsModels.set_db_info(db)

    class Role(db.Model, fsqla.FsRoleMixin):
        pass

    class User(db.Model, fsqla.FsUserMixin):
        pass

    app.register_blueprint(door_app)

    ldap_server = ldap3.Server(app.config['LDAP_URL'])

    # Setup Flask-Security
    user_datastore = SQLAlchemyUserDatastore(db, User, Role)
    security.init_app(app, user_datastore, login_form=ExtendedLoginForm)

    create_super_admins(app, db, user_datastore, logger)

    return app