import { Injectable } from '@nestjs/common';
import { MoexSecuritiesClient } from '../moex-client/moex-securities.client';
import { CacheService } from '../cache/cache.service';
import { SecurityType } from './dto/search-query.dto';

export interface SearchResultItem {
  secid: string;
  isin: string;
  shortName: string;
  type: 'share' | 'bond';
  listLevel: number;
  currency: string | null;
  price: number | null;
}

@Injectable()
export class SecuritiesService {
  constructor(
    private readonly moexSecurities: MoexSecuritiesClient,
    private readonly cache: CacheService,
  ) {}

  async search(query: string, type: SecurityType, limit: number): Promise<SearchResultItem[]> {
    const { data } = await this.cache.getOrFetch(
      'search',
      [query.toLowerCase()],
      async () => {
        const results = await this.moexSecurities.searchSecurities(query);
        return results
          .map((s): SearchResultItem | null => {
            const type =
              s.group === 'stock_shares' ||
              s.type === 'common_share' ||
              s.type === 'preferred_share'
                ? ('share' as const)
                : s.group === 'stock_bonds'
                  ? ('bond' as const)
                  : null;
            if (!type) return null;
            return {
              secid: s.secid,
              isin: s.isin,
              shortName: s.shortName,
              type,
              listLevel: s.listLevel,
              currency: s.faceUnit === 'SUR' ? 'RUB' : s.faceUnit || null,
              price: null,
            };
          })
          .filter((r): r is SearchResultItem => r !== null);
      },
      'searchTtl',
    );

    let filtered = data;
    if (type === SecurityType.SHARE) {
      filtered = data.filter((r) => r.type === 'share');
    } else if (type === SecurityType.BOND) {
      filtered = data.filter((r) => r.type === 'bond');
    }

    return filtered.slice(0, limit);
  }

  async getShareBrief(secid: string): Promise<SearchResultItem | null> {
    try {
      const desc = await this.moexSecurities.getSecurityDescription(secid);
      if (!desc) return null;
      return {
        secid: desc.secid,
        isin: desc.isin,
        shortName: desc.shortName,
        type: 'share',
        listLevel: desc.listLevel,
        currency: desc.faceUnit === 'SUR' ? 'RUB' : desc.faceUnit,
        price: null,
      };
    } catch {
      return null;
    }
  }
}