const winston = require('winston');

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.combine(
    winston.format.timestamp({
      format: 'YYYY-MM-DD HH:mm:ss'
    }),
    winston.format.errors({ stack: true }),
    winston.format.splat(),
    winston.format.json()
  ),
  defaultMeta: { service: 'user-service' },
  transports: [
    new winston.transports.File({ filename: 'error.log', level: 'error' }),
    new winston.transports.File({ filename: 'combined.log' })
  ]
});

if (process.env.NODE_ENV !== 'production') {
  logger.add(new winston.transports.Console({
    format: winston.format.combine(
      winston.format.colorize(),
      winston.format.printf(({ level, message, timestamp, stack }) => {
        if (stack) {
          // 打印错误堆栈
          return `${timestamp} ${level}: ${message}\n${stack}`;
        }
        return `${timestamp} ${level}: ${message}`;
      })
    )
  }));
}

// 在文件日志中也使用更清晰的格式
logger.transports.forEach(t => {
  if (t.name === 'file') {
    t.format = winston.format.combine(
      winston.format.timestamp(),
      winston.format.json()
    );
  }
});

module.exports = logger;