import { Injectable, NestInterceptor, ExecutionContext, CallHandler } from '@nestjs/common';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';
import { Request } from 'express';
import { ApiResponse } from '../interfaces/response.interface';

@Injectable()
export class ResponseInterceptor<T> implements NestInterceptor<T, ApiResponse<T>> {
  intercept(context: ExecutionContext, next: CallHandler): Observable<ApiResponse<T>> {
    const request = context.switchToHttp().getRequest<Request>();
    const requestId = (request.headers['x-request-id'] as string) || undefined;

    return next.handle().pipe(
      map(data => ({
        success: true,
        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
        data,
        meta: {
          timestamp: new Date().toISOString(),
          requestId,
        },
      })),
    );
  }
}