backend/src/tbank/brokerage-operations.service.spec.ts

import {
  BadRequestException,
  NotFoundException,
  ServiceUnavailableException,
} from '@nestjs/common';

jest.mock('../prisma/prisma.service', () => ({
  PrismaService: class PrismaService {},
}));

import { BrokerageOperationsService } from './brokerage-operations.service';
import { TbankCrypto } from './tbank.crypto';

describe('BrokerageOperationsService', () => {
  const key = 'MDEyMzQ1Njc4OWFiY2RlZjAxMjM0NTY3ODlhYmNkZWY=';
  const prisma = { tbankConnection: { findUnique: jest.fn() } };
  const config = { getOrThrow: jest.fn(() => key) };
  const tbank = {
    getOpenAccounts: jest.fn(),
    getOperationsByCursor: jest.fn(),
  };
  const requestContext = { set: jest.fn() };
  const service = new BrokerageOperationsService(
    prisma as never,
    config as never,
    tbank as never,
    requestContext as never,
  );
  const crypto = TbankCrypto.fromBase64(key);
  let operationsRequest: unknown;

  beforeEach(() => {
    jest.clearAllMocks();
    prisma.tbankConnection.findUnique.mockResolvedValue({
      encryptedToken: crypto.encrypt('token'),
    });
    tbank.getOpenAccounts.mockResolvedValue([
      { id: 'account', type: 'ACCOUNT_TYPE_TINKOFF' },
    ]);
    tbank.getOperationsByCursor.mockImplementation(
      (_token: string, request: unknown) => {
        operationsRequest = request;
        return Promise.resolve({ items: [] });
      },
    );
    (service as unknown as { pages: Map<string, unknown> }).pages.clear();
  });

  it('uses the current UTC year by default and asks only for executed operations', async () => {
    await service.get('user', 'account', {});

    const request = operationsRequest as {
      state: string;
      from: { seconds: string };
    };
    expect(request.state).toBe('OPERATION_STATE_EXECUTED');
    expect(request.from.seconds).toBe(
      String(Math.floor(Date.UTC(new Date().getUTCFullYear(), 0, 1) / 1000)),
    );
  });

  it('uses inclusive date boundaries, filters categories, and preserves cursors', async () => {
    tbank.getOperationsByCursor.mockResolvedValue({
      hasNext: true,
      nextCursor: 'next',
      items: [
        { id: 'income', date: { seconds: '1' }, type: 'OPERATION_TYPE_COUPON' },
        {
          id: 'fee',
          date: { seconds: '2' },
          type: 'OPERATION_TYPE_BROKER_FEE',
        },
      ],
    });

    await expect(
      service.get('user', 'account', {
        from: '2025-01-01',
        to: '2025-01-31',
        categories: ['income'],
        cursor: 'previous',
        limit: 10,
      }),
    ).resolves.toMatchObject({
      items: [{ id: 'income' }],
      nextCursor: 'next',
      hasNext: true,
    });
    expect(tbank.getOperationsByCursor).toHaveBeenCalledWith(
      'token',
      expect.objectContaining({
        from: { seconds: '1735689600' },
        to: { seconds: '1738367999', nanos: 999_999_999 },
        cursor: 'previous',
      }),
    );
  });

  it('returns an empty page without calling T-Bank when the period starts in the future', async () => {
    await expect(
      service.get('user', 'account', { from: '2999-01-01T00:00:00.000Z' }),
    ).resolves.toMatchObject({
      accountId: 'account',
      items: [],
      nextCursor: null,
      hasNext: false,
    });
    expect(tbank.getOperationsByCursor).not.toHaveBeenCalled();
  });

  it('rejects inaccessible accounts before reading operations', async () => {
    tbank.getOpenAccounts.mockResolvedValue([]);

    await expect(service.get('user', 'account', {})).rejects.toEqual(
      expect.any(NotFoundException),
    );
    expect(tbank.getOperationsByCursor).not.toHaveBeenCalled();
  });

  it('retains existing T-Bank error semantics', async () => {
    tbank.getOpenAccounts.mockRejectedValueOnce(
      new Error('INVALID_TBANK_TOKEN'),
    );
    await expect(service.get('user', 'account', {})).rejects.toEqual(
      expect.any(BadRequestException),
    );
    tbank.getOpenAccounts.mockResolvedValueOnce([
      { id: 'account', type: 'ACCOUNT_TYPE_TINKOFF' },
    ]);
    tbank.getOperationsByCursor.mockRejectedValueOnce(
      new ServiceUnavailableException({ code: 'TBANK_UNAVAILABLE' }),
    );
    await expect(service.get('user', 'account', {})).rejects.toEqual(
      expect.any(ServiceUnavailableException),
    );
  });
});