import * as winston from 'winston';
import DailyRotateFile from 'winston-daily-rotate-file';
import * as path from 'path';

const logDir = path.join(process.cwd(), 'logs');

// 日志格式
const logFormat = winston.format.combine(
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.errors({ stack: true }),
  winston.format.splat(),
  winston.format.printf(({ timestamp, level, message, context, stack }) => {
    let log = `${timestamp} [${level}]`;
    if (context) {
      log += ` [${context}]`;
    }
    log += ` ${message}`;
    if (stack) {
      log += `\n${stack}`;
    }
    return log;
  }),
);

// 控制台传输
const consoleTransport = new winston.transports.Console({
  format: winston.format.combine(
    winston.format.colorize(),
    logFormat,
  ),
});

// 应用日志传输（按天轮转）
const appLogTransport = new DailyRotateFile({
  dirname: logDir,
  filename: 'application-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  maxSize: '20m',
  maxFiles: '30d',
  format: logFormat,
});

// 错误日志传输（按天轮转）
const errorLogTransport = new DailyRotateFile({
  dirname: logDir,
  filename: 'error-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  level: 'error',
  maxSize: '20m',
  maxFiles: '30d',
  format: logFormat,
});

// 创建 winston logger 实例
export const winstonLogger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  format: logFormat,
  transports: [
    consoleTransport,
    appLogTransport,
    errorLogTransport,
  ],
  exitOnError: false,
});