const logger = require('../utils/logger');

/**
 * Global error handling middleware
 */
const errorHandler = (err, req, res, next) => {
  // Log the error
  logger.error(`${err.name}: ${err.message}`, { 
    stack: err.stack,
    path: req.path,
    method: req.method
  });

  // Default error status and message
  const status = err.status || 500;
  const message = err.message || 'Internal Server Error';

  // Handle specific error types
  if (err.name === 'ValidationError') {
    return res.status(400).json({ 
      error: 'Validation Error', 
      message: err.message,
      details: err.details
    });
  }

  if (err.name === 'UnauthorizedError') {
    return res.status(401).json({ 
      error: 'Unauthorized', 
      message: 'Invalid or expired token'
    });
  }

  // Return error response
  res.status(status).json({
    error: err.name || 'Error',
    message: status === 500 ? 'Internal Server Error' : message
  });
};

module.exports = { errorHandler };