import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
import { Observable } from 'rxjs';
import { InjectPinoLogger, PinoLogger } from 'nestjs-pino';
import { maskSensitive } from '../common/mask.js';

/** 记录请求 body（POST/PUT/PATCH/DELETE），敏感字段脱敏，级别 debug。 */
@Injectable()
export class BodyLoggingInterceptor implements NestInterceptor {
  constructor(@InjectPinoLogger(BodyLoggingInterceptor.name) private readonly logger: PinoLogger) {}

  intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
    const request = context.switchToHttp().getRequest();
    const { method, url, body } = request;
    if (body && ['POST', 'PUT', 'PATCH', 'DELETE'].includes(method) && Object.keys(body).length > 0) {
      this.logger.debug({ method, url, body: maskSensitive(body) }, 'request body');
    }
    return next.handle();
  }
}