import {
  CallHandler,
  ExecutionContext,
  Injectable,
  NestInterceptor,
} from '@nestjs/common';
import { Observable, map } from 'rxjs';

/**
 * Wraps every successful response into `{ data, success: true }`.
 *
 * Exceptions still flow through the global filter and are not wrapped.
 */
@Injectable()
export class TransformInterceptor implements NestInterceptor {
  intercept(_context: ExecutionContext, next: CallHandler): Observable<unknown> {
    return next.handle().pipe(map((data) => ({ data, success: true })));
  }
}