import winston, { format, transports } from 'winston'; // Use ES6 import
// No longer needed: import { TransformableInfo } from 'logform';

// Define the type for the log info object after timestamp is added
// We can simplify this for now or try to infer from winston later
// type TimestampedLogInfo = TransformableInfo & {
//     timestamp: string;
// };

const logger = winston.createLogger({
    level: process.env.LOG_LEVEL || 'info', // Use LOG_LEVEL from env or default to 'info'
    format: format.combine(
        format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }), // This adds the timestamp
        format.printf((info: any) => { // Use 'any' for now to bypass strict type checking here
            // Ensure message exists, handle potential non-string messages if necessary
            // The 'info' object structure depends on the preceding formatters
            const timestamp = info.timestamp || new Date().toISOString(); // Fallback if timestamp isn't added
            const level = (info.level || 'info').toUpperCase();
            const message = typeof info.message === 'string' ? info.message : JSON.stringify(info.message);
            return `${timestamp} ${level}: ${message}`;
        })
    ),
    transports: [
        new transports.Console(),
        // Optionally add file transport
        // new transports.File({ filename: 'combined.log' }),
        // new transports.File({ filename: 'error.log', level: 'error' }),
    ],
});

export default logger; // Use ES6 export default