import { NextFunction, Request, Response } from 'express';
import { ZodError } from 'zod';
import { AppError } from '../lib/errors';

export function errorHandler(err: unknown, _req: Request, res: Response, _next: NextFunction) {
  if (err instanceof AppError) {
    return res.status(err.status).json({
      error: { code: err.code, message: err.message, details: err.details },
    });
  }
  if (err instanceof ZodError) {
    return res.status(400).json({
      error: {
        code: 'validation_error',
        message: 'Validation failed',
        details: err.issues,
      },
    });
  }
  console.error(err);
  return res.status(500).json({
    error: { code: 'internal_error', message: 'Internal server error' },
  });
}