const winston = require('winston');
const path = require('path');
const fs = require('fs');

// Ensure logs directory exists
const logDir = path.join(__dirname, '..', 'logs');
if (!fs.existsSync(logDir)) {
    fs.mkdirSync(logDir, { recursive: true });
}

const logLevel = process.env.LOG_LEVEL || 'info';
const logFile = process.env.LOG_FILE || path.join(logDir, 'app.log');

const logger = winston.createLogger({
    level: logLevel,
    format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.errors({ stack: true }),
        winston.format.json()
    ),
    defaultMeta: { service: 'stl-storage' },
    transports: [
        new winston.transports.File({ 
            filename: path.join(logDir, 'error.log'), 
            level: 'error',
            maxsize: 5242880, // 5MB
            maxFiles: 5
        }),
        new winston.transports.File({ 
            filename: logFile,
            maxsize: 5242880, // 5MB
            maxFiles: 5
        })
    ]
});

// Add console transport for development
if (process.env.NODE_ENV !== 'production') {
    logger.add(new winston.transports.Console({
        format: winston.format.combine(
            winston.format.colorize(),
            winston.format.simple()
        )
    }));
}

module.exports = logger;