package com.tcm.training.admin.app.register.service;

import com.tcm.training.admin.app.register.entity.SysRegion;
import com.tcm.training.admin.app.register.mapper.SysRegionMapper;
import com.tcm.training.admin.app.register.vo.AppRegisterRegionDatasetVO;
import com.tcm.training.admin.app.register.vo.AppRegisterRegionOptionVO;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.mockito.Mockito.when;

/**
 * APP 注册行政区划服务测试。
 */
@ExtendWith(MockitoExtension.class)
class AppRegisterRegionServiceTest {

    @Mock
    private SysRegionMapper sysRegionMapper;

    private AppRegisterRegionService appRegisterRegionService;

    /**
     * 每个用例前重建被测服务。
     */
    @BeforeEach
    void setUp() {
        appRegisterRegionService = new AppRegisterRegionService(sysRegionMapper);
    }

    /**
     * 未传父级编码时应返回省级列表。
     */
    @Test
    void listRegionsShouldReturnProvinceOptions() {
        SysRegion province = buildRegion(1L, "浙江省", "330000", 0L);
        when(sysRegionMapper.selectByParentId(0L)).thenReturn(Collections.singletonList(province));

        List<AppRegisterRegionOptionVO> options = appRegisterRegionService.listRegions(null);

        assertEquals(1, options.size());
        assertEquals("330000", options.get(0).getCode());
        assertEquals("浙江省", options.get(0).getName());
        assertEquals(Integer.valueOf(1), options.get(0).getLevel());
    }

    /**
     * APP 完整地区数据集应过滤区县层级的市辖区占位节点。
     */
    @Test
    void buildRegionDatasetShouldHideMunicipalDistrictPlaceholder() {
        SysRegion province = buildRegion(1L, "江西省", "360000", 0L);
        SysRegion city = buildRegion(2L, "吉安市", "360800", 1L);
        SysRegion placeholder = buildRegion(3L, "吉安市市辖区", "360801", 2L);
        SysRegion district = buildRegion(4L, "吉州区", "360802", 2L);
        when(sysRegionMapper.selectAllOrdered()).thenReturn(
                Arrays.asList(province, city, placeholder, district)
        );

        AppRegisterRegionDatasetVO dataset = appRegisterRegionService.buildRegionDataset();

        assertEquals(1, dataset.getAreas().size());
        assertEquals(1, dataset.getAreas().get(0).size());
        assertEquals(1, dataset.getAreas().get(0).get(0).size());
        assertEquals("吉州区", dataset.getAreas().get(0).get(0).get(0).getLabel());
        assertEquals("360802", dataset.getAreas().get(0).get(0).get(0).getValue());
    }

    /**
     * 海诊通仅返回地区名称时，应通过 sys_region 解析出完整编码。
     */
    @Test
    void resolveRegionSelectionShouldUseNamesWhenCodesMissing() {
        SysRegion province = buildRegion(10L, "浙江省", "330000", 0L);
        SysRegion city = buildRegion(11L, "杭州市", "330100", 10L);
        SysRegion district = buildRegion(12L, "西湖区", "330106", 11L);

        when(sysRegionMapper.selectByParentIdAndName(0L, "浙江省")).thenReturn(province);
        when(sysRegionMapper.selectByParentIdAndName(10L, "杭州市")).thenReturn(city);
        when(sysRegionMapper.selectByParentIdAndName(11L, "西湖区")).thenReturn(district);

        AppRegisterRegionService.RegionSelection selection = appRegisterRegionService.resolveRegionSelection(
                null,
                "浙江省",
                null,
                "杭州市",
                null,
                "西湖区"
        );

        assertEquals("330000", selection.getProvinceCode());
        assertEquals("浙江省", selection.getProvinceName());
        assertEquals("330100", selection.getCityCode());
        assertEquals("杭州市", selection.getCityName());
        assertEquals("330106", selection.getDistrictCode());
        assertEquals("西湖区", selection.getDistrictName());
    }

    /**
     * 海诊通未返回任何地区信息时，应保持空值供前端手动选择。
     */
    @Test
    void resolveRegionSelectionShouldReturnEmptyWhenRegionMissing() {
        AppRegisterRegionService.RegionSelection selection = appRegisterRegionService.resolveRegionSelection(
                null,
                null,
                null,
                null,
                null,
                null
        );

        assertNull(selection.getProvinceCode());
        assertNull(selection.getProvinceName());
        assertNull(selection.getCityCode());
        assertNull(selection.getCityName());
        assertNull(selection.getDistrictCode());
        assertNull(selection.getDistrictName());
    }

    /**
     * 使用统一辅助方法构造测试地区节点。
     */
    private SysRegion buildRegion(Long id, String name, String code, Long parentId) {
        SysRegion region = new SysRegion();
        region.setId(id);
        region.setName(name);
        region.setCode(code);
        region.setParentId(parentId);
        return region;
    }
}