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

export interface StandardApiResponse<T> {
  success: boolean;
  statusCode: number;
  path: string;
  timestamp: string;
  data: T;
}

@Injectable()
export class ResponseInterceptor<T>
  implements NestInterceptor<T, StandardApiResponse<T>>
{
  constructor(private readonly reflector: Reflector) {}

  intercept(
    context: ExecutionContext,
    next: CallHandler,
  ): Observable<StandardApiResponse<T>> {
    const http = context.switchToHttp();
    const response = http.getResponse();
    const request = http.getRequest();

    return next.handle().pipe(
      map((data) => ({
        success: true,
        statusCode: response.statusCode,
        path: request.url,
        timestamp: new Date().toISOString(),
        data,
      })),
    );
  }
}