import { Request, Response, NextFunction } from 'express';
import { logger } from '../utils/logger';

export interface AppError extends Error {
  statusCode?: number;
  isOperational?: boolean;
}

export class CustomError extends Error implements AppError {
  statusCode: number;
  isOperational: boolean;

  constructor(message: string, statusCode: number = 500) {
    super(message);
    this.statusCode = statusCode;
    this.isOperational = true;
    Error.captureStackTrace(this, this.constructor);
  }
}

export const errorHandler = (
  err: AppError,
  req: Request,
  res: Response,
  next: NextFunction
) => {
  const statusCode = err.statusCode || 500;
  const message = err.message || 'Internal Server Error';

  logger.error({
    error: err.message,
    stack: err.stack,
    path: req.path,
    method: req.method,
  });

  res.status(statusCode).json({
    success: false,
    error: {
      message,
      ...(process.env.NODE_ENV === 'development' && { stack: err.stack }),
    },
  });
};