"""Application factory."""

from flask import Flask

from app.config.setting import config
from app.extensions import db


def register_blueprints(app):
    """Register all application blueprints."""
    from app.api.v1 import create_blueprint_v1
    from app.routes.health import bp as health_bp

    # API v1 under /v1
    app.register_blueprint(create_blueprint_v1(), url_prefix="/v1")

    # Health endpoint at /health
    app.register_blueprint(health_bp)


def create_app(env: str = "default"):
    """Create and configure the Flask application."""
    app = Flask(__name__)
    app.config.from_object(config[env])

    # initialize extensions
    db.init_app(app)

    # optional: initialize logging and other extensions here
    try:
        from app.utils.logger import setup_logging

        setup_logging(app)
        app.logger.info("Application initialized in %s mode", env)
    except Exception:
        # keep app creation robust even if logging setup fails
        pass

    register_blueprints(app)

    # Register a global handler to convert APIException instances into JSON responses
    try:
        from app.exceptions.api_exception import APIException

        @app.errorhandler(APIException)
        def handle_api_exception(error):
            # HTTPException.get_response builds a Response object using get_body/get_headers
            response = error.get_response()
            return response
    except Exception:
        pass

    return app