import logging
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_security import Security, SQLAlchemyUserDatastore, hash_password
from email_validator import validate_email
from pathlib import Path

from .door_handle import DoorHandle

security = Security()
db = SQLAlchemy()


# 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)

    token_file = Path(app.config.get('TOKEN_FILE'))
    if not token_file.exists():
        logger.warning(
            f"Token file not found at {token_file.absolute()}. "
            "An empty token file will be created."
        )
        token_file.touch()

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

    # Mail Config
    #mail = Mail(app)

    # Create database connection object
    db.init_app(app)

    from . webapp import door_app
    app.register_blueprint(door_app)

    # Setup Flask-Security
    from .auth import ExtendedLoginForm, User, Role

    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