zod-backend/src/guardian/services/guardian-transactions.service.ts

import { Injectable } from '@nestjs/common';
import { CustomerService } from '~/customer/services';
import { ParentHomeResponseDto, PagedParentTransfersResponseDto } from '~/card/dtos/responses';
import { TransactionService } from '~/card/services/transaction.service';

@Injectable()
export class GuardianTransactionsService {
  constructor(
    private readonly customerService: CustomerService,
    private readonly transactionService: TransactionService,
  ) {}

  async getHome(guardianId: string, size: number): Promise<ParentHomeResponseDto> {
    const parent = await this.customerService.findCustomerById(guardianId);
    const primaryCard = parent.cards?.[0];

    let availableBalance = 0;
    if (primaryCard) {
      const hasLimit = typeof primaryCard.limit === 'number' && !Number.isNaN(primaryCard.limit);
      const hasBalance = primaryCard.account && typeof primaryCard.account.balance === 'number';
      if (hasLimit && hasBalance && primaryCard.limit > 0) {
        availableBalance = Math.min(primaryCard.limit, primaryCard.account.balance);
      } else if (hasBalance) {
        availableBalance = primaryCard.account.balance;
      }
    }

    const recentTransfers = await this.transactionService.getParentTransfersOnly(guardianId, 1, size);

    return new ParentHomeResponseDto(availableBalance, recentTransfers);
  }

  async getTransfers(
    guardianId: string,
    page: number,
    size: number,
  ): Promise<PagedParentTransfersResponseDto> {
    return this.transactionService.getParentTransfersPaginated(guardianId, page, size);
  }
}