import { DepositsService } from './deposits.service';
import { Deposit } from '../entities/deposit.entity';

describe('DepositsService — direct refund', () => {
  it('deducts unbilled personal expenses before refunding the remaining balance', async () => {
    const deposit = {
      id: 1,
      studentId: 10,
      amount: 500,
      status: 'paid',
    } as Deposit;
    const repo = {
      findOne: jest.fn().mockResolvedValue(deposit),
      save: jest.fn().mockImplementation(async (value: Deposit) => value),
    };
    const personalExpenseRepo = {
      createQueryBuilder: jest.fn().mockReturnValue({
        select: jest.fn().mockReturnThis(),
        addSelect: jest.fn().mockReturnThis(),
        where: jest.fn().mockReturnThis(),
        andWhere: jest.fn().mockReturnThis(),
        groupBy: jest.fn().mockReturnThis(),
        getRawMany: jest.fn().mockResolvedValue([{ studentId: 10, amount: '120' }]),
      }),
    };
    const service = new DepositsService(repo as never, {} as never, {} as never, personalExpenseRepo as never);

    const result = await service.refund(
      1,
      { refundDate: '2026-07-13', notes: '退还剩余押金' },
      42,
    );

    expect(result).toMatchObject({
      refundDate: '2026-07-13',
      amount: 0,
      refundAmount: 380,
      deductionAmount: 120,
      deductionReason: '自动扣除个人附加费用 ¥120.00',
      notes: '退还剩余押金',
      status: 'refunded',
      refundedBy: 42,
    });
    expect(result.refundedAt).toBeInstanceOf(Date);
    expect(repo.save).toHaveBeenCalledWith(deposit);
  });
});