package com.tourguide.modules.order.service;

import com.tourguide.modules.order.domain.RefundStatus;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.mapper.TourOrderMapper;
import com.tourguide.modules.order.payment.PaymentRefundGateway;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.math.BigDecimal;
import java.time.LocalDateTime;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

class OrderRefundServiceTest {
    private TourOrderMapper orderMapper;
    private PaymentRefundGateway refundGateway;
    private OrderRefundService refundService;

    @BeforeEach
    void setUp() {
        orderMapper = mock(TourOrderMapper.class);
        refundGateway = mock(PaymentRefundGateway.class);
        refundService = new OrderRefundService(orderMapper, refundGateway);
    }

    @Test
    void paidCancellationShouldSubmitRefundOnce() {
        TourOrder order = paidOrder();
        when(refundGateway.refund(org.mockito.ArgumentMatchers.eq(order),
                org.mockito.ArgumentMatchers.eq(new BigDecimal("36.00"))))
                .thenAnswer(invocation -> order.getRefundOrderNo());

        refundService.requestRefund(order);
        refundService.requestRefund(order);

        assertThat(order.getRefundStatus()).isEqualTo(RefundStatus.REFUNDING.getCode());
        assertThat(order.getRefundOrderNo()).startsWith("RF").hasSize(32);
        assertThat(order.getRefundAmount()).isEqualByComparingTo("36.00");
        assertThat(order.getRefundMethod()).isEqualTo("WECHAT");
        verify(refundGateway, times(1)).refund(order, new BigDecimal("36.00"));
        verify(orderMapper, times(1)).updateById(order);
    }

    @Test
    void gatewayFailureShouldRecordRefundFailure() {
        TourOrder order = paidOrder();
        when(refundGateway.refund(org.mockito.ArgumentMatchers.eq(order),
                org.mockito.ArgumentMatchers.any(BigDecimal.class)))
                .thenThrow(new IllegalStateException("gateway unavailable"));

        refundService.requestRefund(order);

        assertThat(order.getRefundStatus()).isEqualTo(RefundStatus.REFUND_FAILED.getCode());
        verify(orderMapper, times(2)).updateById(order);
    }

    @Test
    void unpaidOrderShouldNotRequestRefund() {
        TourOrder order = paidOrder();
        order.setPaymentTime(null);

        refundService.requestRefund(order);

        verify(refundGateway, never()).refund(org.mockito.ArgumentMatchers.any(),
                org.mockito.ArgumentMatchers.any());
    }

    private TourOrder paidOrder() {
        TourOrder order = new TourOrder();
        order.setId(99L);
        order.setOrderNo("MJ202608030001");
        order.setPaymentOrderNo("PY202608031700000000000000000001");
        order.setPaymentMethod("WECHAT");
        order.setAmount(new BigDecimal("40.00"));
        order.setPaymentAmount(new BigDecimal("36.00"));
        order.setPaymentTime(LocalDateTime.now());
        order.setRefundStatus(RefundStatus.NONE.getCode());
        return order;
    }
}