import { Injectable } from '@nestjs/common';

import { bankSummary } from '../domain/bank-card.calculations';
import { rubMoney } from '../domain/rub-money';
import { BankCardsRepository } from '../infrastructure/bank-cards.repository';
import { BankSummaryQueryDto } from '../presentation/bank-card.dto';
import { periodBounds } from './bank-card-input';
@Injectable()
export class GetBankSummaryUseCase {
  constructor(private readonly repository: BankCardsRepository) {}

  async execute(userId: string, query: BankSummaryQueryDto) {
    const period = periodBounds(query);
    const { operations, categories } = await this.repository.summaryData(
      userId,
      period,
      query.cardId,
    );
    const totals = bankSummary(period, operations);
    return {
      month: query.month,
      ...period,
      cardId: query.cardId ?? null,
      expenses: rubMoney(totals.expenses),
      refunds: rubMoney(totals.refunds),
      net: rubMoney(totals.net),
      categories: totals.categories.map((row) => {
        const category = categories.find((c) => c.id === row.categoryId);
        if (!category) throw new Error('Bank operation category is missing');
        return {
          categoryId: row.categoryId,
          categoryName: category.name,
          expenses: rubMoney(row.expenses),
          refunds: rubMoney(row.refunds),
          net: rubMoney(row.net),
        };
      }),
    };
  }
}