import { ArgumentsHost, Catch, ExceptionFilter, HttpException, HttpStatus } from '@nestjs/common';
import { Response } from 'express';

@Catch()
export class AllExceptionsFilter implements ExceptionFilter {
  catch(exception: unknown, host: ArgumentsHost) {
    const ctx = host.switchToHttp();
    const response = ctx.getResponse<Response>();
    const status = exception instanceof HttpException ? exception.getStatus() : HttpStatus.INTERNAL_SERVER_ERROR;
    const body = exception instanceof HttpException ? exception.getResponse() : undefined;
    const message =
      typeof body === 'object' && body && 'message' in body
        ? Array.isArray((body as { message: unknown }).message)
          ? 'Validation failed'
          : String((body as { message: unknown }).message)
        : exception instanceof Error
          ? exception.message
          : 'Internal server error';

    response.status(status).json({
      success: false,
      message,
      error: typeof body === 'object' && body ? body : { code: HttpStatus[status] ?? 'ERROR' },
    });
  }
}