import logging
import sys
import json
from typing import Any, Dict

class JSONFormatter(logging.Formatter):
    """
    Formatter that outputs JSON strings after parsing the LogRecord.
    """
    def format(self, record: logging.LogRecord) -> str:
        log_record: Dict[str, Any] = {
            "timestamp": self.formatTime(record, self.datefmt),
            "level": record.levelname,
            "message": record.getMessage(),
            "module": record.module,
            "funcName": record.funcName,
            "lineNo": record.lineno,
        }
        
        if record.exc_info:
            log_record["exception"] = self.formatException(record.exc_info)
            
        return json.dumps(log_record)

def setup_logging(log_level: str = "INFO"):
    """
    Setup structured logging.
    """
    root_logger = logging.getLogger()
    root_logger.setLevel(log_level)
    
    handler = logging.StreamHandler(sys.stdout)
    formatter = JSONFormatter()
    handler.setFormatter(formatter)
    
    root_logger.handlers = []
    root_logger.addHandler(handler)
    
    logging.getLogger("uvicorn.access").handlers = []
    logging.getLogger("uvicorn.access").propagate = True