"""WSGI entry point for production deployment."""
from app import app


class ReverseProxied:
    """WSGI middleware that reads X-Script-Name header from reverse proxy
    and sets SCRIPT_NAME so Flask's url_for() generates correct prefixed URLs.

    The reverse proxy (nginx/Apache) should set this header to the subpath
    prefix, e.g. /hm-ai-qc-report.
    """

    def __init__(self, app):
        self.app = app

    def __call__(self, environ, start_response):
        script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
        if script_name:
            environ['SCRIPT_NAME'] = script_name
            # Strip the prefix from PATH_INFO if it's still there
            path_info = environ.get('PATH_INFO', '')
            if path_info.startswith(script_name):
                environ['PATH_INFO'] = path_info[len(script_name):]
        return self.app(environ, start_response)


application = ReverseProxied(app)

if __name__ == "__main__":
    app.run()