package com.superbiz.agent.service;

import com.superbiz.agent.dto.KnowledgeEntry;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
import org.springframework.test.util.ReflectionTestUtils;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

/**
 * KnowledgeIndexService 单元测试
 */
class KnowledgeIndexServiceTest {

    private KnowledgeIndexService service;

    @TempDir
    Path tempDir;

    @BeforeEach
    void setUp() {
        service = new KnowledgeIndexService();
        ReflectionTestUtils.setField(service, "knowledgeBasePath", tempDir.toString());
    }

    @Test
    void testExactMatch_singleMatch() {
        // 准备测试数据
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("test.md")
                .title("Test")
                .keywords(List.of("ERR_TIMEOUT", "超时"))
                .summary("Test summary")
                .category("api")
                .build();

        service.addToIndex(entry);

        // 测试匹配
        List<KnowledgeEntry> results = service.exactMatch("ERR_TIMEOUT");

        assertEquals(1, results.size());
        assertEquals("Test", results.get(0).getTitle());
    }

    @Test
    void testExactMatch_caseInsensitive() {
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("test.md")
                .keywords(List.of("ERR_TIMEOUT"))
                .build();

        service.addToIndex(entry);

        // 小写查询应该匹配
        List<KnowledgeEntry> results = service.exactMatch("err_timeout");
        assertEquals(1, results.size());
    }

    @Test
    void testExactMatch_partialMatch() {
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("test.md")
                .keywords(List.of("支付网关"))
                .build();

        service.addToIndex(entry);

        // 包含关键词的查询应该匹配
        List<KnowledgeEntry> results = service.exactMatch("支付网关超时问题");
        assertEquals(1, results.size());
    }

    @Test
    void testExactMatch_multipleMatches() {
        KnowledgeEntry entry1 = KnowledgeEntry.builder()
                .filePath("doc1.md")
                .title("Doc 1")
                .keywords(List.of("超时"))
                .build();

        KnowledgeEntry entry2 = KnowledgeEntry.builder()
                .filePath("doc2.md")
                .title("Doc 2")
                .keywords(List.of("超时", "错误"))
                .build();

        service.addToIndex(entry1);
        service.addToIndex(entry2);

        // 应该匹配两个文档
        List<KnowledgeEntry> results = service.exactMatch("超时");
        assertEquals(2, results.size());
    }

    @Test
    void testExactMatch_noMatch() {
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("test.md")
                .keywords(List.of("错误码"))
                .build();

        service.addToIndex(entry);

        // 不匹配的查询
        List<KnowledgeEntry> results = service.exactMatch("限流");
        assertEquals(0, results.size());
    }

    @Test
    void testExactMatch_emptyQuery() {
        List<KnowledgeEntry> results = service.exactMatch("");
        assertEquals(0, results.size());
    }

    @Test
    void testExactMatch_nullQuery() {
        List<KnowledgeEntry> results = service.exactMatch(null);
        assertEquals(0, results.size());
    }

    @Test
    void testReadDocument_success() throws Exception {
        // 创建测试文件
        Path testFile = tempDir.resolve("test.md");
        String content = "Test content line 1\nTest content line 2\n";
        Files.writeString(testFile, content);

        // 读取文件
        String result = service.readDocument(testFile.toString(), 100);

        assertNotNull(result);
        assertTrue(result.contains("Test content"));
    }

    @Test
    void testReadDocument_relativePathUnderBasePath() throws Exception {
        Path categoryDir = tempDir.resolve("payment");
        Files.createDirectories(categoryDir);
        Path testFile = categoryDir.resolve("relative.md");
        Files.writeString(testFile, "Relative content");

        String result = service.readDocument("payment/relative.md", 100);

        assertEquals("Relative content", result);
    }

    @Test
    void testReadDocument_legacyPathAlreadyContainsBasePath() throws Exception {
        Path categoryDir = tempDir.resolve("payment");
        Files.createDirectories(categoryDir);
        Path testFile = categoryDir.resolve("legacy.md");
        Files.writeString(testFile, "Legacy content");

        String result = service.readDocument(tempDir.getFileName() + "/payment/legacy.md", 100);

        assertEquals("Legacy content", result);
    }

    @Test
    void testReadDocument_exceedsMaxChars() throws Exception {
        // 创建超长内容
        String longContent = "x".repeat(3000);
        Path testFile = tempDir.resolve("long.md");
        Files.writeString(testFile, longContent);

        // 读取限制字符数
        String result = service.readDocument(testFile.toString(), 2000);

        assertNotNull(result);
        assertEquals(2003, result.length()); // 2000 + "..."
        assertTrue(result.endsWith("..."));
    }

    @Test
    void testReadDocument_fileNotFound() {
        String result = service.readDocument("nonexistent.md", 100);
        assertNull(result);
    }

    @Test
    void testAddToIndex() {
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("new.md")
                .title("New Document")
                .keywords(List.of("test"))
                .build();

        service.addToIndex(entry);

        List<KnowledgeEntry> results = service.exactMatch("test");
        assertEquals(1, results.size());
        assertEquals("New Document", results.get(0).getTitle());
    }

    @Test
    void testRemoveFromIndex() {
        KnowledgeEntry entry = KnowledgeEntry.builder()
                .filePath("remove.md")
                .keywords(List.of("test"))
                .build();

        service.addToIndex(entry);
        assertEquals(1, service.exactMatch("test").size());

        service.removeFromIndex("remove.md");
        assertEquals(0, service.exactMatch("test").size());
    }

    @Test
    void testGetIndexSize() {
        assertEquals(0, service.getIndexSize());

        service.addToIndex(KnowledgeEntry.builder()
                .filePath("doc1.md")
                .keywords(List.of("test"))
                .build());

        assertEquals(1, service.getIndexSize());

        service.addToIndex(KnowledgeEntry.builder()
                .filePath("doc2.md")
                .keywords(List.of("test"))
                .build());

        assertEquals(2, service.getIndexSize());
    }
}