"""Application factory; package imports do not initialize storage or networking."""


def create_app(config=None):
    from collections import defaultdict
    import logging
    from pathlib import Path
    from threading import Lock

    from flask import Flask

    from .config import ROOT_DIR, default_config
    from . import customer_service, db, file_service, hooks, visitor_service
    from .routes import register_routes
    from .routes.speech import MemoryAudioRequest

    app = Flask(__name__, template_folder=str(ROOT_DIR/'templates'),
                static_folder=str(ROOT_DIR/'static'))
    app.request_class = MemoryAudioRequest
    app.config.update(default_config())
    if config:
        app.config.update(config)
    app.extensions['human_typing'] = {}
    app.extensions['rate_hits'] = defaultdict(list)
    app.extensions['customer_login_attempts'] = {}
    app.extensions['customer_login_lock'] = Lock()
    app.before_request(hooks.rate_limit)
    app.before_request(visitor_service.attach_visitor)
    app.before_request(customer_service.attach_customer)
    app.after_request(hooks.no_cache_html)
    app.teardown_appcontext(db.close_connections)
    register_routes(app)

    if app.config['INITIALIZE_RUNTIME']:
        if not app.testing:
            from flask.logging import default_handler
            log_directory = Path(app.config['LOG_DIR'])
            log_directory.mkdir(parents=True, exist_ok=True)
            log_path = str((log_directory/'app.log').resolve())
            app.logger = logging.getLogger('logistics_chat.' + log_path)
            app.logger.setLevel(logging.INFO)
            if default_handler not in app.logger.handlers:
                app.logger.addHandler(default_handler)
            if not any(getattr(handler, 'baseFilename', None) == log_path for handler in app.logger.handlers):
                handler = logging.FileHandler(log_path, encoding='utf-8')
                handler.setFormatter(logging.Formatter('%(asctime)s [%(levelname)s] %(message)s'))
                app.logger.addHandler(handler)
        with app.app_context():
            db.init_db()
            db.backup_db()
            file_service.cleanup_uploads()
    return app