import logging
import json
import sys
from datetime import datetime, timezone


class JsonFormatter(logging.Formatter):
    """
    Outputs JSON-formatted logs suitable for Docker, Elastic, Loki, etc.
    """
    def format(self, record):
        log_record = {
            "timestamp": datetime.now(timezone.utc).isoformat(),
            "level": record.levelname,
            "logger": record.name,
            "message": record.getMessage(),
            "module": record.module,
            "funcName": record.funcName,
            "lineNo": record.lineno,
        }

        if hasattr(record, "props"):
            log_record.update(record.props)

        if record.exc_info:
            log_record["exception"] = self.formatException(record.exc_info)

        return json.dumps(log_record)


def get_logger(name: str) -> logging.Logger:
    logger = logging.getLogger(name)

    # Prevent duplicate handlers in Docker/Gunicorn/etc.
    if not logger.hasHandlers():
        handler = logging.StreamHandler(sys.stdout)
        handler.setFormatter(JsonFormatter())
        handler.setLevel(logging.INFO)

        logger.addHandler(handler)
        logger.setLevel(logging.INFO)
        logger.propagate = False

    return logger