import winston from 'winston';
import path from 'path';

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

// Define log format
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.json()
);

// Console format for development
const consoleFormat = winston.format.combine(
  winston.format.colorize(),
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
  winston.format.printf(({ timestamp, level, message, ...meta }) => {
    let metaString = '';
    if (Object.keys(meta).length > 0) {
      metaString = JSON.stringify(meta, null, 2);
    }
    return `${timestamp} [${level}]: ${message} ${metaString}`;
  })
);

// Create the logger
const logger = winston.createLogger({
  level: process.env.LOG_LEVEL || 'info',
  format: logFormat,
  defaultMeta: { service: 'feuerwehr-dashboard-api' },
  transports: [
    // Write all logs with importance level of 'error' or less to error.log
    new winston.transports.File({
      filename: path.join(logDir, 'error.log'),
      level: 'error',
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
    // Write all logs to combined.log
    new winston.transports.File({
      filename: path.join(logDir, 'combined.log'),
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
  ],
});

// Always log to console so errors are visible in `docker logs`
logger.add(
  new winston.transports.Console({
    format: consoleFormat,
  })
);

export default logger;