telegram-management-system/marketing-agent/services/webhook-service/src/middleware/errorHandler.js

import { logger } from '../utils/logger.js';

export default function errorHandler(err, req, res, next) {
    logger.error('Error:', err);

    // Mongoose validation error
    if (err.name === 'ValidationError') {
        const errors = Object.values(err.errors).map(e => e.message);
        return res.status(400).json({
            error: 'Validation failed',
            details: errors
        });
    }

    // Mongoose duplicate key error
    if (err.code === 11000) {
        const field = Object.keys(err.keyPattern)[0];
        return res.status(409).json({
            error: `Duplicate value for field: ${field}`
        });
    }

    // JWT errors
    if (err.name === 'JsonWebTokenError') {
        return res.status(401).json({
            error: 'Invalid token'
        });
    }

    if (err.name === 'TokenExpiredError') {
        return res.status(401).json({
            error: 'Token expired'
        });
    }

    // Default error
    res.status(err.status || 500).json({
        error: err.message || 'Internal server error',
        ...(process.env.NODE_ENV === 'development' && { stack: err.stack })
    });
}