package com.guo.learningprogresstracker.service.impl;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.guo.learningprogresstracker.entity.ReviewStandardMindMapEntity;
import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
import com.guo.learningprogresstracker.mapper.*;
import com.guo.learningprogresstracker.service.MindMapAiClient;
import com.guo.learningprogresstracker.utils.CompareResult;
import com.guo.learningprogresstracker.utils.MindMapNode;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.test.util.ReflectionTestUtils;

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

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;

@ExtendWith(MockitoExtension.class)
class StandardMindMapServiceImplTest {

    @InjectMocks
    private StandardMindMapServiceImpl service;

    @Mock
    private ReviewStandardMindMapMapper standardMindMapMapper;
    @Mock
    private ReviewRecallRecordMapper recallRecordMapper;
    @Mock
    private TasksMapper tasksMapper;
    @Mock
    private StudyReportsMapper studyReportsMapper;
    @Mock
    private StudyReportFragmentsMapper studyReportFragmentsMapper;
    @Mock
    private TaskApplicationMapper taskApplicationMapper;
    @Mock
    private StudySessionsMapper studySessionsMapper;
    @Mock
    private List<MindMapAiClient> aiClients;
    @Mock
    private MindMapAiClient mockAiClient;
    @Mock
    private AiServiceClient aiServiceClient;

    private final ObjectMapper objectMapper = new ObjectMapper();

    // ============ normalize / fuzzyMatch / bigramSet ============

    @Test
    void normalize_shouldStripPunctuationAndLowercase() {
        assertEquals("javaconcurrency", StandardMindMapServiceImpl.normalize("Java Concurrency"));
        assertEquals("测试abc", StandardMindMapServiceImpl.normalize("测试，ABC！？"));
        assertEquals("helloworld", StandardMindMapServiceImpl.normalize("  Hello, World! "));
        assertEquals("", StandardMindMapServiceImpl.normalize(null));
        assertEquals("", StandardMindMapServiceImpl.normalize(""));
    }

    @Test
    void normalize_shouldStripCompareMarkers() {
        assertEquals("thread", StandardMindMapServiceImpl.normalize("MATCHED|Thread"));
        assertEquals("thread", StandardMindMapServiceImpl.normalize("MISSED|Thread"));
    }

    @Test
    void bigramSet_shouldExtractCharacterPairs() {
        java.util.Set<String> set = StandardMindMapServiceImpl.bigramSet("hello");
        assertTrue(set.contains("he"));
        assertTrue(set.contains("el"));
        assertTrue(set.contains("ll"));
        assertTrue(set.contains("lo"));
        assertEquals(4, set.size());
    }

    @Test
    void bigramSet_shouldReturnEmptyForShortStrings() {
        assertTrue(StandardMindMapServiceImpl.bigramSet("a").isEmpty());
        assertTrue(StandardMindMapServiceImpl.bigramSet("").isEmpty());
    }

    // ============ compareTrees ============

    @Test
    void compareTrees_perfectMatch() {
        service = createService();

        MindMapNode standard = new MindMapNode("学习Java");
        standard.setChildren(List.of(new MindMapNode("线程基础"), new MindMapNode("锁机制")));

        MindMapNode recall = new MindMapNode("学习Java");
        recall.setChildren(List.of(new MindMapNode("线程基础"), new MindMapNode("锁机制")));

        CompareResult result = service.compareTrees(standard, recall);

        assertEquals(2, result.getMatchedCount());
        assertEquals(0, result.getMissedCount());
        assertEquals(0, result.getExtraCount());
        assertEquals(1.0, result.getRecallRatio(), 0.001);
    }

    @Test
    void compareTrees_partialMatch() {
        service = createService();

        MindMapNode standard = new MindMapNode("学习Java");
        standard.setChildren(List.of(
                new MindMapNode("线程基础"),
                new MindMapNode("锁机制"),
                new MindMapNode("JVM内存模型")
        ));

        MindMapNode recall = new MindMapNode("学习Java");
        recall.setChildren(List.of(
                new MindMapNode("线程基础"),
                new MindMapNode("SpringBoot")
        ));

        CompareResult result = service.compareTrees(standard, recall);

        assertEquals(1, result.getMatchedCount());
        assertEquals(2, result.getMissedCount());
        assertEquals(1, result.getExtraCount());
    }

    @Test
    void compareTrees_noMatch() {
        service = createService();

        MindMapNode standard = new MindMapNode("学习Java");
        standard.setChildren(List.of(new MindMapNode("线程基础"), new MindMapNode("锁机制")));

        MindMapNode recall = new MindMapNode("完全不同");
        recall.setChildren(List.of(new MindMapNode("前端开发")));

        CompareResult result = service.compareTrees(standard, recall);

        assertEquals(0, result.getMatchedCount());
        assertEquals(2, result.getMissedCount());
        assertEquals(1, result.getExtraCount());
        assertEquals(0.0, result.getRecallRatio(), 0.001);
    }

    // ============ 边缘情况 ============

    @Test
    void compareTrees_emptyStandardLeaves() {
        service = createService();

        MindMapNode standard = new MindMapNode("根"); // 无子节点
        MindMapNode recall = new MindMapNode("根");
        recall.setChildren(List.of(new MindMapNode("额外节点")));

        CompareResult result = service.compareTrees(standard, recall);

        assertEquals(0, result.getMatchedCount());
        assertEquals(0, result.getMissedCount());
        assertEquals(1, result.getExtraCount());
        assertEquals(0.0, result.getRecallRatio(), 0.001);
    }

    @Test
    void getOrGenerate_shouldThrowWhenTaskNotFound() {
        when(tasksMapper.exists(any())).thenReturn(false);
        assertThrows(NotFindEntitiesException.class, () -> service.getOrGenerate("NOT_EXIST"));
    }

    @Test
    void getOrGenerate_shouldReturnExisting() throws Exception {
        when(tasksMapper.exists(any())).thenReturn(true);

        ReviewStandardMindMapEntity existing = new ReviewStandardMindMapEntity();
        existing.setId(1);
        existing.setTaskNum("T1");
        existing.setTitle("已有导图");
        when(standardMindMapMapper.selectOne(any())).thenReturn(existing);

        ReviewStandardMindMapEntity result = service.getOrGenerate("T1");
        assertEquals("已有导图", result.getTitle());
        verify(standardMindMapMapper, never()).insert(any());
    }

    // ============ 辅助 ============

    private StandardMindMapServiceImpl createService() {
        StandardMindMapServiceImpl s = new StandardMindMapServiceImpl(
                standardMindMapMapper, recallRecordMapper,
                tasksMapper, studyReportsMapper, studyReportFragmentsMapper,
                taskApplicationMapper, studySessionsMapper,
                List.of(mockAiClient), objectMapper, aiServiceClient);
        return s;
    }
}