package com.tourguide.modules.finance.service;

import com.tourguide.modules.user.mapper.GuideUserMapper;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.math.BigDecimal;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

class GuideWithdrawableBalanceServiceTest {
    private GuideUserMapper guideUserMapper;
    private GuideWithdrawableBalanceService service;

    @BeforeEach
    void setUp() {
        guideUserMapper = mock(GuideUserMapper.class);
        service = new GuideWithdrawableBalanceService(guideUserMapper);
    }

    @Test
    void shouldReadStoredGuideBalance() {
        when(guideUserMapper.selectBalance(8L)).thenReturn(new BigDecimal("504.30"));

        assertThat(service.getAvailableAmount(8L)).isEqualByComparingTo("504.30");
    }

    @Test
    void shouldAtomicallyDebitStoredBalance() {
        when(guideUserMapper.decreaseBalance(8L, new BigDecimal("80.00"))).thenReturn(1);

        assertThat(service.debit(8L, new BigDecimal("80"))).isTrue();
        verify(guideUserMapper).decreaseBalance(8L, new BigDecimal("80.00"));
    }
}