from logging.config import dictConfig
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():
    # Configure logging BEFORE creating the application object
    dictConfig({
        'version': 1,
        'disable_existing_loggers': False,
        'formatters': {
            'default': {
                'format': '[%(asctime)s] %(levelname)s in %(module)s: %(message)s',
            },
            'plain': {
                'format': '%(message)s',
            }
        },
        'handlers': {
            # Console handler (keeps logs visible in terminal)
            'wsgi': {
                'class': 'logging.StreamHandler',
                'stream': 'ext://flask.logging.wsgi_errors_stream',
                'formatter': 'default'
            },
            # File handler for Application Logs (slides.log)
            'slides_file': {
                'class': 'logging.handlers.RotatingFileHandler',
                'filename': 'slides.log',
                'maxBytes': 1024 * 1024 * 10,  # 10 MB
                'backupCount': 5,
                'formatter': 'default',
                'level': 'INFO',
                'encoding': 'utf8'
            },
            # File handler for Request Logs (requests.log)
            'requests_file': {
                'class': 'logging.handlers.RotatingFileHandler',
                'filename': 'requests.log',
                'maxBytes': 1024 * 1024 * 10,  # 10 MB
                'backupCount': 5,
                'formatter': 'plain', # Requests already have timestamps/formatting
                'level': 'INFO',
                'encoding': 'utf8'
            }
        },
        'root': {
            'level': 'INFO',
            'handlers': ['wsgi', 'slides_file']
        },
        'loggers': {
            # Isolate the Werkzeug request logger
            'werkzeug': {
                'level': 'INFO',
                'handlers': ['wsgi', 'requests_file'],
                'propagate': False # Prevent requests from leaking into slides.log
            }
        }
    })

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