import { Injectable } from '@nestjs/common';
import { CacheService } from '../../cache/cache.service';
import { TBANK_CACHE_KEYS } from '../tbank.config';
import type { TBankInstrument, TBankInstrumentResponse } from '../types/tbank-proto.types';
import { TBankClientService } from './tbank-client.service';

@Injectable()
export class BrokerInstrumentsService {
  constructor(
    private readonly tbankClient: TBankClientService,
    private readonly cacheService: CacheService,
  ) {}

  async findByInstrumentUid(instrumentUid: string): Promise<TBankInstrument | null> {
    const result = await this.cacheService.getOrFetch(
      TBANK_CACHE_KEYS.instrument,
      [instrumentUid],
      () => this.fetchByUid(instrumentUid),
      'tbankInstrumentTtl',
    );

    return result.data;
  }

  private async fetchByUid(instrumentUid: string): Promise<TBankInstrument | null> {
    const instrumentsClient = this.tbankClient.getServiceClient('InstrumentsService') as any;
    const response = await this.tbankClient.callUnary<
      { idType: string; id: string },
      TBankInstrumentResponse
    >(
      'InstrumentsService/GetInstrumentBy',
      instrumentsClient.getInstrumentBy.bind(instrumentsClient),
      { idType: 'INSTRUMENT_ID_TYPE_UID', id: instrumentUid },
    );

    return response.instrument ?? null;
  }
}