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

/**
 * Winston 日志配置
 * 支持同时输出到控制台和文件
 */

// 日志目录 - 统一使用项目根目录的 logs/backend
const logsDir = path.join(process.cwd(), '..', 'logs', 'backend');

// 自定义日志格式
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 }) => {
    const contextStr = context ? `[${context}] ` : '';
    const stackStr = stack ? `\n${stack}` : '';
    return `${timestamp} [${level.toUpperCase()}] ${contextStr}${message}${stackStr}`;
  }),
);

// 控制台输出格式（带颜色）
const consoleFormat = winston.format.combine(
  winston.format.colorize({ all: true }),
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.printf(({ timestamp, level, message, context }) => {
    const contextStr = context ? `[${context}] ` : '';
    return `${timestamp} ${level} ${contextStr}${message}`;
  }),
);

// 文件轮转配置（每日轮转）
const dailyRotateFileTransport = new winston.transports.DailyRotateFile({
  dirname: logsDir,
  filename: 'application-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  zippedArchive: true,        // 压缩旧日志
  maxSize: '20m',              // 单个文件最大 20MB
  maxFiles: '30d',             // 保留 30 天
  format: logFormat,
});

// 错误日志单独文件
const errorFileTransport = new winston.transports.DailyRotateFile({
  dirname: logsDir,
  filename: 'error-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  zippedArchive: true,
  maxSize: '20m',
  maxFiles: '30d',
  level: 'error',
  format: logFormat,
});

// HTTP 请求日志单独文件
const httpFileTransport = new winston.transports.DailyRotateFile({
  dirname: path.join(logsDir, 'http'),
  filename: 'http-%DATE%.log',
  datePattern: 'YYYY-MM-DD',
  zippedArchive: true,
  maxSize: '50m',              // HTTP 日志可能更大
  maxFiles: '14d',             // 保留 14 天
  format: logFormat,
});

// 控制台输出
const consoleTransport = new winston.transports.Console({
  format: consoleFormat,
});

// 创建 Winston Logger 实例
export const winstonLogger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  transports: [
    consoleTransport,           // 控制台输出
    dailyRotateFileTransport,   // 通用日志文件
    errorFileTransport,         // 错误日志文件
  ],
});

// HTTP 专用 Logger
export const httpLogger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  transports: [
    consoleTransport,           // 控制台也显示
    httpFileTransport,          // HTTP 日志文件
  ],
});

// 日志级别映射
export const LogLevel = {
  error: 'error',
  warn: 'warn',
  info: 'info',
  http: 'http',
  verbose: 'verbose',
  debug: 'debug',
  silly: 'silly',
} as const;

/**
 * 创建带 context 的 logger
 */
export function createLogger(context: string) {
  return {
    error: (message: string, trace?: string) => {
      winstonLogger.error(message, { context, stack: trace });
    },
    warn: (message: string) => {
      winstonLogger.warn(message, { context });
    },
    log: (message: string) => {
      winstonLogger.info(message, { context });
    },
    debug: (message: string) => {
      winstonLogger.debug(message, { context });
    },
    verbose: (message: string) => {
      winstonLogger.verbose(message, { context });
    },
  };
}

/**
 * HTTP 请求日志
 */
export function logHttp(message: string, meta?: any) {
  httpLogger.http(message, meta);
}