import { Injectable } from '@nestjs/common';
import { MoexClientService } from '../moex-client/moex-client.service';
import { CacheService } from '../cache/cache.service';
import { CandleInterval } from './dto/candles-query.dto';

@Injectable()
export class CandlesService {
  constructor(
    private readonly moexClient: MoexClientService,
    private readonly cache: CacheService,
  ) {}

  private mapInterval(interval: CandleInterval): 60 | 24 {
    return interval === CandleInterval.HOUR ? 60 : 24;
  }

  async getCandles(
    market: 'shares' | 'bonds',
    secid: string,
    interval: CandleInterval,
    from: string,
    till: string,
  ) {
    const moexInterval = this.mapInterval(interval);
    const { data, fromCache, cachedAt } = await this.cache.getOrFetch(
      'candles',
      [market, secid, String(moexInterval), from, till],
      () => this.moexClient.getCandles('stock', market, secid, moexInterval, from, till),
      'candlesTtl',
    );

    return {
      data: data.map((c) => ({
        open: c.open,
        high: c.high,
        low: c.low,
        close: c.close,
        volume: c.volume,
        value: c.value,
        begin: c.begin,
        end: c.end,
      })),
      meta: { fromCache, cachedAt },
    };
  }
}