import { Request, Response, NextFunction } from 'express';
import { Error as ApiError } from '@unito/integration-api';

import { HttpError } from '../httpErrors.js';

declare global {
  // eslint-disable-next-line @typescript-eslint/no-namespace
  namespace Express {
    interface Locals {
      error?: ApiError;
    }
  }
}

function onError(err: Error, _req: Request, res: Response, next: NextFunction) {
  if (res.headersSent) {
    return next(err);
  }

  let error: ApiError;

  if (err instanceof HttpError) {
    error = {
      code: err.status.toString(),
      message: err.message,
      details: {
        stack: err.stack,
      },
    };
  } else {
    error = {
      code: '500',
      message: 'Oops! Something went wrong',
      originalError: {
        code: err.name,
        message: err.message,
        details: {
          stack: err.stack,
        },
      },
    };
  }

  res.locals.error = structuredClone(error);

  // Keep the stack details in development for the Debugger
  if (process.env.NODE_ENV !== 'development') {
    delete error.details;
    delete error.originalError?.details;
  }

  res.status(Number(error.code)).json(error);
}

export default onError;