import os
import logging
from logging.handlers import WatchedFileHandler
from flask import Flask
from flask_socketio import SocketIO
from .models import db
from .utils import init_password_generator, init_serializer
from .auth import init_auth
from .seed_db import seed_courses

socketio = SocketIO(async_mode='eventlet', cors_allowed_origins="*")

def create_app():
    # 1. Setup Log Directory
    log_dir = os.path.join(os.getcwd(), 'logs') 
    if not os.path.exists(log_dir):
        os.makedirs(log_dir)

    app = Flask(__name__, static_folder='static', static_url_path='/static')
    app.config.from_object('config.Config')

    file_handler = WatchedFileHandler(log_dir + '/app.log', mode='a', encoding='UTF-8')
    file_handler.setFormatter(logging.Formatter(
        '%(asctime)s %(levelname)s [%(module)s:%(lineno)d]: %(message)s'
        ))
    file_handler.setLevel(logging.INFO)
    app.logger.addHandler(file_handler)
    app.logger.setLevel(logging.INFO)

    db.init_app(app)

    with app.app_context():
        db.create_all()
        seed_courses()

    init_password_generator()
    init_serializer(app)
    init_auth(app)

    socketio.init_app(app)

    from .routes import main
    app.register_blueprint(main)
    return app