"""Structured logging with syslog support."""

import json
import logging
import sys
from logging.handlers import SysLogHandler

from guarddog_nexus.config import config


class JsonFormatter(logging.Formatter):
    def format(self, record: logging.LogRecord) -> str:
        payload = {
            "timestamp": self.formatTime(record, self.datefmt),
            "level": record.levelname,
            "logger": record.name,
            "message": record.getMessage(),
        }
        if record.exc_info and record.exc_info[1]:
            payload["exception"] = str(record.exc_info[1])
        return json.dumps(payload, ensure_ascii=False)


def setup_logging() -> logging.Logger:
    logger = logging.getLogger("guarddog_nexus")
    logger.setLevel(config.log_level.upper())

    stdout_handler = logging.StreamHandler(sys.stdout)
    stdout_handler.setFormatter(JsonFormatter())
    logger.addHandler(stdout_handler)

    if config.log_syslog_host:
        syslog_handler = SysLogHandler(
            address=(config.log_syslog_host, config.log_syslog_port),
            facility=SysLogHandler.LOG_LOCAL0,
        )
        syslog_handler.setFormatter(JsonFormatter())
        logger.addHandler(syslog_handler)

    return logger


log = setup_logging()