import winston from 'winston';
import path from 'path';
import { config } from './config';

const logDir = path.join(__dirname, '../logs');

// Create logs directory if it doesn't exist
import fs from 'fs';
if (!fs.existsSync(logDir)) {
  fs.mkdirSync(logDir, { recursive: true });
}

const logFormat = winston.format.combine(
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.errors({ stack: true }),
  winston.format.json()
);

const consoleFormat = winston.format.combine(
  winston.format.colorize(),
  winston.format.timestamp({ format: 'HH:mm:ss' }),
  winston.format.printf(({ timestamp, level, message, ...meta }) => {
    const metaStr = Object.keys(meta).length ? ` ${JSON.stringify(meta)}` : '';
    return `${timestamp} ${level}: ${message}${metaStr}`;
  })
);

// log auth attempts and failures
export const logger = winston.createLogger({
  level: config.logging.level,
  format: logFormat,
  transports: [
    // logs auth and security events
    new winston.transports.File({
      filename: path.join(logDir, 'security.log'),
      level: 'info',
      format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.json()
      )
    }),

    // logs all errors
    new winston.transports.File({
      filename: path.join(logDir, 'error.log'),
      level: 'error'
    }),

    // logs everything
    new winston.transports.File({
      filename: path.join(logDir, 'combined.log')
    })
  ]
});

// console log in dev
if (config.server.nodeEnv === 'development') {
  logger.add(new winston.transports.Console({
    format: consoleFormat
  }));
}

// Security specific logging
export const securityLogger = {
  rateLimitExceeded: (ip: string, endpoint: string) => {
    logger.warn('Rate limit exceeded', {
      event: 'rate_limit_exceeded',
      ip,
      endpoint,
      timestamp: new Date().toISOString()
    });
  },

  suspiciousActivity: (ip: string, activity: string, details?: any) => {
    logger.warn('Suspicious activity detected', {
      event: 'suspicious_activity',
      ip,
      activity,
      details,
      timestamp: new Date().toISOString()
    });
  }
};

export default logger;