/**
 * FTS5 会话内容搜索 + 审计日志导出 回归测试（v0.5.0）
 *
 * 覆盖：
 * 1. messages_fts 虚表创建与触发器实时同步（INSERT / DELETE）
 * 2. searchMessages：短语命中、跨会话聚合、FTS 运算符输入安全、snippet 生成
 * 3. 审计导出：JSONL 行格式、CSV RFC 4180 转义（逗号/引号/换行）
 *
 * 运行要求：better-sqlite3 为 Electron ABI 构建，需 test:electron 模式
 * （cross-env ELECTRON_RUN_AS_NODE=1 electron ...）执行；系统 Node 下自动跳过。
 */

import { describe, it, expect, beforeAll, afterAll, vi } from 'vitest';

vi.mock('electron-log', () => ({
  default: { info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() },
}));

import { mkdtempSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';

let dbAvailable = true;
let Database: typeof import('better-sqlite3');
try {
  // eslint-disable-next-line @typescript-eslint/no-require-imports
  Database = require('better-sqlite3');
  const probe = new Database(':memory:');
  probe.close();
} catch {
  dbAvailable = false;
}

describe.skipIf(!dbAvailable)('FTS5 会话内容搜索', () => {
  let db: any;
  let dir: string;
  let sessionService: any;

  beforeAll(async () => {
    const { SessionService } = await import('../session.service');
    dir = mkdtempSync(join(tmpdir(), 'metona-search-'));
    db = new Database(':memory:');
    // 与 DatabaseService.createTables 一致的最小 schema（含 FTS 虚表 + 触发器）
    db.exec(`
      CREATE TABLE sessions (
        id TEXT PRIMARY KEY,
        title TEXT DEFAULT '新会话',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL,
        message_count INTEGER DEFAULT 0,
        pinned INTEGER DEFAULT 0,
        archived INTEGER DEFAULT 0,
        metadata TEXT DEFAULT '{}'
      );
      CREATE TABLE messages (
        id TEXT PRIMARY KEY,
        session_id TEXT NOT NULL,
        role TEXT NOT NULL,
        content TEXT,
        reasoning_content TEXT,
        tool_calls TEXT,
        tool_result TEXT,
        attachments TEXT,
        iteration INTEGER,
        created_at INTEGER NOT NULL
      );
      CREATE VIRTUAL TABLE messages_fts USING fts5(
        content,
        content=messages,
        content_rowid=rowid,
        tokenize='trigram'
      );
      CREATE TRIGGER messages_fts_insert AFTER INSERT ON messages BEGIN
        INSERT INTO messages_fts(rowid, content) VALUES (new.rowid, new.content);
      END;
      CREATE TRIGGER messages_fts_delete AFTER DELETE ON messages BEGIN
        INSERT INTO messages_fts(messages_fts, rowid, content) VALUES ('delete', old.rowid, old.content);
      END;
    `);
    sessionService = new SessionService(() => db);
  });

  afterAll(() => {
    try {
      db?.close();
    } catch {
      /* ignore */
    }
    try {
      rmSync(dir, { recursive: true, force: true });
    } catch {
      /* ignore */
    }
  });

  const insertMessage = (
    id: string,
    sessionId: string,
    role: string,
    content: string | null,
    ts: number,
  ): void => {
    db.prepare(
      `INSERT INTO messages (id, session_id, role, content, created_at) VALUES (?, ?, ?, ?, ?)`,
    ).run(id, sessionId, role, content, ts);
  };

  it('FTS5 可用且插入消息实时进入索引', () => {
    // FTS5 编译可用性（better-sqlite3 预编译含 FTS5，此处防御性验证）
    insertMessage('m1', 's1', 'user', 'Hello FTS5 world', 1000);
    const rows = db
      .prepare(`SELECT COUNT(*) AS c FROM messages_fts WHERE messages_fts MATCH 'hello'`)
      .all() as Array<{ c: number }>;
    expect(rows[0].c).toBe(1);
  });

  it('searchMessages 按会话聚合返回（最新匹配 + 匹配计数 + snippet）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('s1', '会话一', 1, 1)`,
    ).run();
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('s2', '会话二', 1, 1)`,
    ).run();
    insertMessage('m2', 's1', 'assistant', 'uniquekeyword 出现了一次', 2000);
    insertMessage('m3', 's2', 'user', 'uniquekeyword 在另一个会话', 3000);
    insertMessage('m4', 's2', 'assistant', 'uniquekeyword 再次出现', 4000);

    const results = sessionService.searchMessages('uniquekeyword');
    expect(results).toHaveLength(2);
    // s2 的最新匹配（m4）先返回（按时间倒序聚合）
    expect(results[0].sessionId).toBe('s2');
    expect(results[0].matchCount).toBe(2);
    expect(results[0].lastMessageId).toBe('m4');
    expect(results[0].sessionTitle).toBe('会话二');
    expect(results[0].snippet).toContain('uniquekeyword');
    // s1 单条匹配
    expect(results[1].sessionId).toBe('s1');
    expect(results[1].matchCount).toBe(1);
  });

  it('删除消息后索引同步（搜索不再命中）', () => {
    db.prepare(`DELETE FROM messages WHERE id = 'm2'`).run();
    const results = sessionService.searchMessages('uniquekeyword');
    expect(results).toHaveLength(1);
    expect(results[0].sessionId).toBe('s2');
  });

  it('FTS 运算符/引号输入安全（不抛错，按短语匹配）', () => {
    insertMessage('m5', 's1', 'user', '包含 AND OR NOT 与 "引号" 的消息', 5000);
    // 含 FTS 保留字与引号的查询不抛异常
    expect(() => sessionService.searchMessages('AND OR NOT')).not.toThrow();
    expect(() => sessionService.searchMessages('x"y')).not.toThrow();
    // 引号内容作为短语可命中
    const hit = sessionService.searchMessages('引号');
    expect(hit.some((r: any) => r.lastMessageId === 'm5')).toBe(true);
  });

  // v0.7.4 P4-4: trigram 中文子串搜索（messages_fts trigram tokenizer）
  it('trigram 中文子串搜索：≥3 字查询命中非连续子串（P4-4 根治）', () => {
    insertMessage('m14', 's1', 'user', '人工智能正在改变世界', 7000);
    // 3 字子串「人工智」/「能正在」—— trigram 任意子串命中
    const hit1 = sessionService.searchMessages('人工智');
    expect(hit1.some((r: any) => r.lastMessageId === 'm14')).toBe(true);
    const hit2 = sessionService.searchMessages('智能正');
    expect(hit2.some((r: any) => r.lastMessageId === 'm14')).toBe(true);
    // 4 字整串命中
    const hit3 = sessionService.searchMessages('人工智能');
    expect(hit3.some((r: any) => r.lastMessageId === 'm14')).toBe(true);
    // 2 字中文走 LIKE 回退（trigram 无法匹配 2 字）
    const hit4 = sessionService.searchMessages('正在');
    expect(hit4.some((r: any) => r.lastMessageId === 'm14')).toBe(true);
    // 不存在的子串不命中
    expect(sessionService.searchMessages('机器学习')).toHaveLength(0);
  });

  // v0.7.4 P4-4 修正: ≤2 字符查询（trigram 无法构成 3-gram）LIKE 回退
  it('≤2 字符查询（2 字英文/单字符）LIKE 回退命中（P4-4 修正）', () => {
    insertMessage('m15', 's1', 'user', 'AI 助手 ok 完成', 9000);
    // 2 字英文：trigram 0 命中，LIKE 回退
    const hit1 = sessionService.searchMessages('AI');
    expect(hit1.some((r: any) => r.lastMessageId === 'm15')).toBe(true);
    // 2 字英文小写
    const hit2 = sessionService.searchMessages('ok');
    expect(hit2.some((r: any) => r.lastMessageId === 'm15')).toBe(true);
    // 单字符英文
    const hit3 = sessionService.searchMessages('o');
    expect(hit3.some((r: any) => r.lastMessageId === 'm15')).toBe(true);
    // 2 字中文 LIKE 回退仍生效
    const hit4 = sessionService.searchMessages('助手');
    expect(hit4.some((r: any) => r.lastMessageId === 'm15')).toBe(true);
  });

  it('空查询与无匹配返回空数组', () => {
    expect(sessionService.searchMessages('')).toHaveLength(0);
    expect(sessionService.searchMessages('   ')).toHaveLength(0);
    expect(sessionService.searchMessages('不存在的关键词xyz')).toHaveLength(0);
  });

  it('NULL content 消息不进索引（assistant 仅有 tool_calls 场景）', () => {
    insertMessage('m6', 's1', 'assistant', null, 6000);
    const rows = db
      .prepare(`SELECT COUNT(*) AS c FROM messages_fts WHERE messages_fts MATCH 'nulltest'`)
      .all() as Array<{ c: number }>;
    expect(rows[0].c).toBe(0);
    // FTS 行数与 messages 行数一致（NULL 行在 FTS 中占位但不索引内容）
    const fts = (db.prepare('SELECT COUNT(*) AS c FROM messages_fts').get() as { c: number }).c;
    const msg = (db.prepare('SELECT COUNT(*) AS c FROM messages').get() as { c: number }).c;
    expect(fts).toBe(msg);
  });

  it('删除 NULL content 消息不抛错且索引保持一致（truncateAfter 安全性）', () => {
    // 模拟真实会话混合场景：user 文本 + assistant(NULL, 仅 tool_calls) + tool 结果 + assistant 文本
    insertMessage('m7', 's3', 'user', 'ftsdelete-test 用户消息', 7000);
    insertMessage('m8', 's3', 'assistant', null, 7100);
    insertMessage('m9', 's3', 'tool', '工具结果包含 ftsdelete-test 关键词', 7200);
    insertMessage('m10', 's3', 'assistant', '最终回答', 7300);
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('s3', '会话三', 1, 1)`,
    ).run();

    const ftsBefore = (db.prepare('SELECT COUNT(*) AS c FROM messages_fts').get() as { c: number })
      .c;
    const msgBefore = (db.prepare('SELECT COUNT(*) AS c FROM messages').get() as { c: number }).c;
    expect(ftsBefore).toBe(msgBefore);

    // 删除 NULL content 行 — delete 触发器以 old.content=NULL 执行 'delete' 命令
    expect(() => db.prepare(`DELETE FROM messages WHERE id = 'm8'`).run()).not.toThrow();

    // 行数仍一致
    const ftsAfter = (db.prepare('SELECT COUNT(*) AS c FROM messages_fts').get() as { c: number })
      .c;
    const msgAfter = (db.prepare('SELECT COUNT(*) AS c FROM messages').get() as { c: number }).c;
    expect(ftsAfter).toBe(msgAfter);
    expect(ftsAfter).toBe(ftsBefore - 1);

    // 索引仍可正常查询（未被 NULL 删除破坏）
    const hit = sessionService.searchMessages('ftsdelete-test');
    expect(hit.some((r: any) => r.sessionId === 's3')).toBe(true);
  });

  it('混合 NULL/非 NULL 的批量删除（truncateAfter 全场景）不抛错', () => {
    // 再插入一批混合消息
    insertMessage('m11', 's3', 'assistant', null, 8000);
    insertMessage('m12', 's3', 'user', 'ftsdelete-test 第二轮', 8100);
    insertMessage('m13', 's3', 'assistant', null, 8200);

    // 批量删除（模拟 truncateMessagesAfter 的 rowid 范围删除）
    expect(() =>
      db
        .prepare(
          `DELETE FROM messages WHERE session_id = 's3' AND rowid >= (SELECT rowid FROM messages WHERE id = 'm7')`,
        )
        .run(),
    ).not.toThrow();

    // s3 全删后行数一致，其他会话索引不受影响
    const fts = (db.prepare('SELECT COUNT(*) AS c FROM messages_fts').get() as { c: number }).c;
    const msg = (db.prepare('SELECT COUNT(*) AS c FROM messages').get() as { c: number }).c;
    expect(fts).toBe(msg);
    const s3Hit = sessionService.searchMessages('ftsdelete-test');
    expect(s3Hit.every((r: any) => r.sessionId !== 's3')).toBe(true);
    // 其他会话仍可搜索
    expect(sessionService.searchMessages('uniquekeyword').length).toBeGreaterThanOrEqual(1);
  });
});

describe.skipIf(!dbAvailable)('SessionService — 会话 CRUD 与消息边界', () => {
  let db: any;
  let sessionService: any;

  beforeAll(async () => {
    const { SessionService } = await import('../session.service');
    db = new Database(':memory:');
    db.exec(`
      CREATE TABLE sessions (
        id TEXT PRIMARY KEY,
        title TEXT DEFAULT '新会话',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL,
        message_count INTEGER DEFAULT 0,
        total_tokens INTEGER DEFAULT 0,
        pinned INTEGER DEFAULT 0,
        archived INTEGER DEFAULT 0,
        metadata TEXT DEFAULT '{}'
      );
      CREATE TABLE messages (
        id TEXT PRIMARY KEY,
        session_id TEXT NOT NULL,
        role TEXT NOT NULL,
        content TEXT,
        reasoning_content TEXT,
        tool_calls TEXT,
        tool_result TEXT,
        attachments TEXT,
        iteration INTEGER,
        created_at INTEGER NOT NULL,
        updated_at INTEGER
      );
      CREATE TABLE session_summaries (
        session_id TEXT PRIMARY KEY,
        summary TEXT NOT NULL,
        summarized_until_rowid INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      );
    `);
    sessionService = new SessionService(() => db);
  });

  afterAll(() => {
    try {
      db?.close();
    } catch {
      /* ignore */
    }
  });

  const createSession = (id: string, title = '会话'): void => {
    db.prepare(`INSERT INTO sessions (id, title, created_at, updated_at) VALUES (?, ?, ?, ?)`).run(
      id,
      title,
      Date.now(),
      Date.now(),
    );
  };

  const insertMessage = (
    id: string,
    sessionId: string,
    role: string,
    content: string | null,
    ts: number,
  ): void => {
    db.prepare(
      `INSERT INTO messages (id, session_id, role, content, created_at) VALUES (?, ?, ?, ?, ?)`,
    ).run(id, sessionId, role, content, ts);
  };

  it('getSession 返回完整会话信息（pinned/archived 布尔映射）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at, message_count, total_tokens, pinned, archived)
       VALUES ('crud_s1', 'CRUD 会话', 1, 2, 5, 123, 1, 0)`,
    ).run();
    const info = sessionService.getSession('crud_s1');
    expect(info).toMatchObject({
      id: 'crud_s1',
      title: 'CRUD 会话',
      messageCount: 5,
      totalTokens: 123,
      pinned: true,
      archived: false,
    });
  });

  it('getSession 不存在的会话返回 null', () => {
    expect(sessionService.getSession('crud_nope')).toBeNull();
  });

  it('getSession 对归档会话仍可查询（归档不隐藏，P1-4 契约）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at, archived) VALUES ('crud_arch', '归档会话', 1, 1, 1)`,
    ).run();
    expect(sessionService.getSession('crud_arch')).not.toBeNull();
  });

  it('list 默认只返回未归档会话，按 pinned 优先 + updated_at 倒序', () => {
    createSession('crud_l1', '普通');
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at, pinned) VALUES ('crud_l2', '置顶', 1, 10, 1)`,
    ).run();
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at, archived) VALUES ('crud_l3', '归档', 1, 20, 1)`,
    ).run();

    const list = sessionService.list();
    const ids = list.map((s: any) => s.id);
    expect(ids).toContain('crud_l2');
    expect(ids).not.toContain('crud_l3');
    // 置顶的排最前
    expect(ids[0]).toBe('crud_l2');
  });

  it('list({ archived: true }) 只返回归档会话', () => {
    const list = sessionService.list({ archived: true });
    expect(list.every((s: any) => s.archived)).toBe(true);
  });

  it('rename 成功返回 true 且标题更新；不存在返回 false', () => {
    createSession('crud_r1', '旧标题');
    expect(sessionService.rename('crud_r1', '新标题')).toBe(true);
    expect(sessionService.getSession('crud_r1').title).toBe('新标题');
    expect(sessionService.rename('crud_r2_missing', 'x')).toBe(false);
  });

  it('pin 置顶/取消置顶并返回布尔', () => {
    createSession('crud_p1');
    expect(sessionService.pin('crud_p1', true)).toBe(true);
    expect(sessionService.getSession('crud_p1').pinned).toBe(true);
    expect(sessionService.pin('crud_p1', false)).toBe(true);
    expect(sessionService.getSession('crud_p1').pinned).toBe(false);
    expect(sessionService.pin('crud_p_missing', true)).toBe(false);
  });

  it('archive 归档/取消归档并返回布尔', () => {
    createSession('crud_a1');
    expect(sessionService.archive('crud_a1', true)).toBe(true);
    expect(sessionService.getSession('crud_a1').archived).toBe(true);
    expect(sessionService.archive('crud_a1', false)).toBe(true);
    expect(sessionService.getSession('crud_a1').archived).toBe(false);
  });

  it('delete 级联删除消息（ON DELETE CASCADE 前提）并返回布尔', () => {
    // 本 schema 无 FK，直接验证 messages 被删除的调用方语义（真实库有 CASCADE）
    createSession('crud_del', '将被删除');
    insertMessage('crud_del_m1', 'crud_del', 'user', '消息', 1);
    expect(sessionService.delete('crud_del')).toBe(true);
    expect(sessionService.getSession('crud_del')).toBeNull();
    expect(sessionService.delete('crud_del_missing')).toBe(false);
  });

  it('getMessages 默认全部返回（按 rowid 升序）', () => {
    createSession('crud_msg', '消息边界');
    insertMessage('crud_msg_m1', 'crud_msg', 'user', '第一条', 1);
    insertMessage('crud_msg_m2', 'crud_msg', 'assistant', '第二条', 2);
    insertMessage('crud_msg_m3', 'crud_msg', 'user', '第三条', 3);

    const messages = sessionService.getMessages('crud_msg');
    expect(messages.map((m: any) => m.content)).toEqual(['第一条', '第二条', '第三条']);
  });

  it('getMessages 分页：limit + offset', () => {
    const page = sessionService.getMessages('crud_msg', { limit: 2, offset: 1 });
    expect(page.map((m: any) => m.content)).toEqual(['第二条', '第三条']);
  });

  it('getMessages afterRowid 游标：仅返回 rowid 更大的消息', () => {
    const second = db
      .prepare(`SELECT rowid AS rid FROM messages WHERE id = 'crud_msg_m2'`)
      .get() as { rid: number };
    const after = sessionService.getMessages('crud_msg', { afterRowid: second.rid });
    expect(after.map((m: any) => m.content)).toEqual(['第三条']);
  });

  it('getMessages 返回 rowId 字段（截断/摘要游标语义）', () => {
    const messages = sessionService.getMessages('crud_msg');
    expect(messages[0].rowId).toBeGreaterThan(0);
  });

  it('saveMessage 持久化全部字段并回读（toolCalls/attachments JSON 序列化）', () => {
    createSession('crud_save', '保存消息');
    const saved = sessionService.saveMessage({
      sessionId: 'crud_save',
      role: 'assistant',
      content: null,
      reasoningContent: '思考过程',
      toolCalls: [{ name: 'read_file', args: { path: '/a' } }],
      iteration: 3,
    });
    expect(saved.content).toBeNull();
    expect(saved.toolCalls).toEqual([{ name: 'read_file', args: { path: '/a' } }]);

    const loaded = sessionService.getMessages('crud_save');
    expect(loaded[0].toolCalls).toEqual([{ name: 'read_file', args: { path: '/a' } }]);
    expect(loaded[0].reasoningContent).toBe('思考过程');
    expect(loaded[0].iteration).toBe(3);
  });

  it('saveMessage 累加会话 message_count 并更新 updated_at', () => {
    createSession('crud_cnt', '计数');
    sessionService.saveMessage({ sessionId: 'crud_cnt', role: 'user', content: '1' });
    sessionService.saveMessage({ sessionId: 'crud_cnt', role: 'user', content: '2' });
    const info = sessionService.getSession('crud_cnt');
    expect(info.messageCount).toBe(2);
  });

  it('updateMessageContent 仅允许 user 角色：user 更新成功', () => {
    insertMessage('crud_um1', 'crud_cnt', 'user', '原内容', 1);
    expect(sessionService.updateMessageContent('crud_cnt', 'crud_um1', '新内容')).toBe(true);
    const msg = sessionService.getMessages('crud_cnt').find((m: any) => m.id === 'crud_um1');
    expect(msg.content).toBe('新内容');
  });

  it('updateMessageContent 拒绝非 user 角色消息（返回 false 不改写）', () => {
    insertMessage('crud_um2', 'crud_cnt', 'assistant', '助手原话', 2);
    expect(sessionService.updateMessageContent('crud_cnt', 'crud_um2', '篡改')).toBe(false);
    const msg = sessionService.getMessages('crud_cnt').find((m: any) => m.id === 'crud_um2');
    expect(msg.content).toBe('助手原话');
  });

  it('updateMessageContent 消息不存在或会话不匹配返回 false', () => {
    expect(sessionService.updateMessageContent('crud_cnt', 'crud_ghost', 'x')).toBe(false);
    expect(sessionService.updateMessageContent('crud_other_session', 'crud_um1', 'x')).toBe(false);
  });

  it('updateTokenUsage 累加 total_tokens（多次调用叠加）', () => {
    createSession('crud_tok', 'Token 统计');
    sessionService.updateTokenUsage('crud_tok', 100);
    sessionService.updateTokenUsage('crud_tok', 250);
    expect(sessionService.getSession('crud_tok').totalTokens).toBe(350);
  });

  it('updateTokenUsage 负数抵扣（token 计费冲正场景）', () => {
    sessionService.updateTokenUsage('crud_tok', -50);
    expect(sessionService.getSession('crud_tok').totalTokens).toBe(300);
  });

  it('saveTraceData/getTraceData 往返（traceSteps + tokenUsage 存入 metadata）', () => {
    createSession('crud_trace', 'Trace');
    sessionService.saveTraceData('crud_trace', {
      traceSteps: [{ id: 'step1', startedAt: 100 }],
      tokenUsage: { input: 10, output: 20, total: 30 },
    });
    const data = sessionService.getTraceData('crud_trace');
    expect(data).toEqual({
      traceSteps: [{ id: 'step1', startedAt: 100 }],
      tokenUsage: { input: 10, output: 20, total: 30 },
    });
  });

  it('getTraceData 无 metadata 返回 null', () => {
    createSession('crud_notrace', '无 Trace');
    expect(sessionService.getTraceData('crud_notrace')).toBeNull();
  });

  it('getTraceData 损坏 metadata 返回 null（不抛错）', () => {
    db.prepare(`UPDATE sessions SET metadata = '{broken' WHERE id = 'crud_notrace'`).run();
    expect(sessionService.getTraceData('crud_notrace')).toBeNull();
  });

  it('getTraceData metadata 无 trace 字段时返回 null（{} 或无关字段）', () => {
    db.prepare(`UPDATE sessions SET metadata = '{"foo":1}' WHERE id = 'crud_notrace'`).run();
    expect(sessionService.getTraceData('crud_notrace')).toBeNull();
  });

  it('truncateMessagesAfter：锚点为首条消息（inclusive）删除全部', () => {
    createSession('crud_tr1', '截断一');
    insertMessage('crud_tr1_a', 'crud_tr1', 'user', '首条', 1);
    insertMessage('crud_tr1_b', 'crud_tr1', 'assistant', '次条', 2);
    insertMessage('crud_tr1_c', 'crud_tr1', 'user', '末条', 3);
    expect(sessionService.truncateMessagesAfter('crud_tr1', 'crud_tr1_a', true)).toBe(true);
    expect(sessionService.getMessages('crud_tr1')).toHaveLength(0);
  });

  it('truncateMessagesAfter：锚点为末条（inclusive）仅删锚点', () => {
    createSession('crud_tr2', '截断二');
    insertMessage('crud_tr2_a', 'crud_tr2', 'user', '首条', 1);
    insertMessage('crud_tr2_b', 'crud_tr2', 'assistant', '次条', 2);
    insertMessage('crud_tr2_c', 'crud_tr2', 'user', '末条', 3);
    expect(sessionService.truncateMessagesAfter('crud_tr2', 'crud_tr2_c', true)).toBe(true);
    const remaining = sessionService.getMessages('crud_tr2');
    expect(remaining).toHaveLength(2);
    expect(remaining[1].content).toBe('次条');
  });

  it('truncateMessagesAfter：inclusive=false 保留锚点本身', () => {
    createSession('crud_tr3', '截断三');
    insertMessage('crud_tr3_a', 'crud_tr3', 'user', '锚点', 1);
    insertMessage('crud_tr3_b', 'crud_tr3', 'assistant', '后一条', 2);
    insertMessage('crud_tr3_c', 'crud_tr3', 'user', '后两条', 3);
    expect(sessionService.truncateMessagesAfter('crud_tr3', 'crud_tr3_a', false)).toBe(true);
    const remaining = sessionService.getMessages('crud_tr3');
    expect(remaining.map((m: any) => m.content)).toEqual(['锚点']);
  });

  it('truncateMessagesAfter：锚点不存在返回 false 且无副作用', () => {
    createSession('crud_tr4', '截断四');
    insertMessage('crud_tr4_a', 'crud_tr4', 'user', '唯一消息', 1);
    const before = sessionService.getMessages('crud_tr4').length;
    expect(sessionService.truncateMessagesAfter('crud_tr4', 'crud_ghost', true)).toBe(false);
    expect(sessionService.getMessages('crud_tr4').length).toBe(before);
  });

  it('truncateMessagesAfter：inclusive 变体对摘要游标的联动（游标落在删除区则删摘要）', () => {
    createSession('crud_tr5', '截断五');
    insertMessage('crud_tr5_a', 'crud_tr5', 'user', 'a', 1);
    insertMessage('crud_tr5_b', 'crud_tr5', 'assistant', 'b', 2);
    insertMessage('crud_tr5_c', 'crud_tr5', 'user', 'c', 3);
    const cursor = (
      db.prepare(`SELECT MAX(rowid) AS r FROM messages WHERE session_id = 'crud_tr5'`).get() as {
        r: number;
      }
    ).r;
    db.prepare(
      `INSERT INTO session_summaries (session_id, summary, summarized_until_rowid, updated_at) VALUES ('crud_tr5', '摘要', ?, ?)`,
    ).run(cursor, Date.now());
    // inclusive=true 删 b、c（rowid >= b 的 rowid）→ 游标被覆盖 → 摘要清除
    expect(sessionService.truncateMessagesAfter('crud_tr5', 'crud_tr5_b', true)).toBe(true);
    const summaries = db
      .prepare(`SELECT session_id FROM session_summaries WHERE session_id = 'crud_tr5'`)
      .all();
    expect(summaries).toHaveLength(0);
  });

  it('clearMessages 清空消息、重置计数并置空 metadata（B-2/A1 契约）', () => {
    createSession('crud_clear', '清空');
    insertMessage('crud_clear_a', 'crud_clear', 'user', '1', 1);
    insertMessage('crud_clear_b', 'crud_clear', 'user', '2', 2);
    sessionService.saveTraceData('crud_clear', { traceSteps: [{ id: 's' }], tokenUsage: {} });
    expect(() => sessionService.clearMessages('crud_clear')).not.toThrow();
    expect(sessionService.getMessages('crud_clear')).toHaveLength(0);
    expect(sessionService.getSession('crud_clear').messageCount).toBe(0);
    expect(sessionService.getTraceData('crud_clear')).toBeNull();
  });
});

describe.skipIf(!dbAvailable)('searchMessages — 更多查询形态与边界', () => {
  let db: any;
  let sessionService: any;

  beforeAll(async () => {
    const { SessionService } = await import('../session.service');
    db = new Database(':memory:');
    db.exec(`
      CREATE TABLE sessions (
        id TEXT PRIMARY KEY,
        title TEXT DEFAULT '新会话',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL,
        message_count INTEGER DEFAULT 0,
        pinned INTEGER DEFAULT 0,
        archived INTEGER DEFAULT 0,
        metadata TEXT DEFAULT '{}'
      );
      CREATE TABLE messages (
        id TEXT PRIMARY KEY,
        session_id TEXT NOT NULL,
        role TEXT NOT NULL,
        content TEXT,
        reasoning_content TEXT,
        tool_calls TEXT,
        tool_result TEXT,
        attachments TEXT,
        iteration INTEGER,
        created_at INTEGER NOT NULL
      );
      CREATE VIRTUAL TABLE messages_fts USING fts5(
        content,
        content=messages,
        content_rowid=rowid,
        tokenize='trigram'
      );
      CREATE TRIGGER messages_fts_insert AFTER INSERT ON messages BEGIN
        INSERT INTO messages_fts(rowid, content) VALUES (new.rowid, new.content);
      END;
      CREATE TRIGGER messages_fts_delete AFTER DELETE ON messages BEGIN
        INSERT INTO messages_fts(messages_fts, rowid, content) VALUES ('delete', old.rowid, old.content);
      END;
    `);
    sessionService = new SessionService(() => db);
  });

  afterAll(() => {
    try {
      db?.close();
    } catch {
      /* ignore */
    }
  });

  const insertMessage = (
    id: string,
    sessionId: string,
    role: string,
    content: string,
    ts: number,
  ): void => {
    db.prepare(
      `INSERT INTO messages (id, session_id, role, content, created_at) VALUES (?, ?, ?, ?, ?)`,
    ).run(id, sessionId, role, content, ts);
  };

  it('英文短语（含空格）按整体短语命中', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q1', '短语会话', 1, 1)`,
    ).run();
    insertMessage('q1_m1', 'q1', 'assistant', 'the quick brown fox jumps', 100);
    insertMessage('q1_m2', 'q1', 'user', 'the lazy dog sleeps', 200);
    // 2 字以上英文 → 引号短语匹配
    const hits = sessionService.searchMessages('quick brown');
    expect(hits.some((r: any) => r.lastMessageId === 'q1_m1')).toBe(true);
    expect(hits.some((r: any) => r.lastMessageId === 'q1_m2')).toBe(false);
  });

  it('中英混排查询（无空格短语）可命中混合内容', () => {
    insertMessage('q1_m3', 'q1', 'assistant', '配置 config修改 混合内容', 300);
    const hits = sessionService.searchMessages('config修改');
    expect(hits.some((r: any) => r.lastMessageId === 'q1_m3')).toBe(true);
  });

  it('FTS 保留字运算符被转义（AND/OR/NOT 不触发语法错误）', () => {
    insertMessage('q1_m4', 'q1', 'user', 'and or not 关键字测试', 400);
    expect(() => sessionService.searchMessages('and or not')).not.toThrow();
    // 作为普通文本命中
    const hits = sessionService.searchMessages('and or not');
    expect(hits.some((r: any) => r.lastMessageId === 'q1_m4')).toBe(true);
  });

  it('查询中的星号/连字符不触发 FTS 语法错误', () => {
    insertMessage('q1_m5', 'q1', 'user', 'version-2 star*text', 500);
    expect(() => sessionService.searchMessages('version-2')).not.toThrow();
    expect(() => sessionService.searchMessages('star*')).not.toThrow();
  });

  it('超长查询（>200 字符）不抛错且按短语匹配', () => {
    const longContent = '超长内容 ' + 'abc '.repeat(80);
    insertMessage('q1_m6', 'q1', 'user', longContent, 600);
    const longQuery = 'abc '.repeat(30).trim();
    expect(() => sessionService.searchMessages(longQuery)).not.toThrow();
  });

  it('scanLimit 边界：仅扫描前 N 条匹配（聚合结果受限制）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q2', '扫描上限', 1, 1)`,
    ).run();
    // 同一会话 5 条匹配 + 另一会话 1 条匹配
    for (let i = 1; i <= 5; i++) {
      insertMessage(`q2_m${i}`, 'q2', 'user', `scanlimit-hit 第 ${i} 次`, i * 10);
    }
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q3', '另一个', 1, 1)`,
    ).run();
    insertMessage('q3_m1', 'q3', 'user', 'scanlimit-hit 在别的会话', 999);

    const full = sessionService.searchMessages('scanlimit-hit');
    expect(full.length).toBe(2); // 两个会话都被聚合
    // scanLimit=1：只扫描最新 1 条 → 仅 q3 被聚合（q3_m1 时间最新）
    const limited = sessionService.searchMessages('scanlimit-hit', { scanLimit: 1 });
    expect(limited).toHaveLength(1);
    expect(limited[0].sessionId).toBe('q3');
  });

  it('maxSessions 边界：聚合结果被截断到上限', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q4', 's4', 1, 1)`,
    ).run();
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q5', 's5', 1, 1)`,
    ).run();
    insertMessage('q4_m1', 'q4', 'user', 'maxsessions-hit', 10);
    insertMessage('q5_m1', 'q5', 'user', 'maxsessions-hit', 20);

    const capped = sessionService.searchMessages('maxsessions-hit', { maxSessions: 1 });
    expect(capped).toHaveLength(1);
    expect(capped[0].sessionId).toBe('q5'); // 时间最新的优先
  });

  it('matchCount 聚合计数正确（同一会话多次匹配）', () => {
    const hits = sessionService.searchMessages('scanlimit-hit');
    const q2 = hits.find((r: any) => r.sessionId === 'q2');
    expect(q2.matchCount).toBe(5);
  });

  it('snippet 含高亮标记且截取自消息开头', () => {
    const hits = sessionService.searchMessages('maxsessions-hit');
    // snippet() 使用 '[','] ' 包裹命中的前 12 个 trigram token —— 命中词前缀可见
    expect(hits[0].snippet).toContain('[maxsessions');
    expect(hits[0].snippet).toContain(']');
  });

  it('2 字英文查询走 LIKE 回退且大小写不敏感', () => {
    insertMessage('q6_m1', 'q6', 'user', 'SQLite database is good', 1);
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q6', 'like', 1, 1)`,
    ).run();
    // 'sq' 为 2 字 → trigram 无法构成 3-gram → LIKE 回退；SQLite LIKE 对 ASCII 大小写不敏感
    const hits = sessionService.searchMessages('sq');
    expect(hits.some((r: any) => r.lastMessageId === 'q6_m1')).toBe(true);
  });

  it('LIKE 回退时 % 与 _ 通配符被转义（不误匹配任意内容）', () => {
    insertMessage('q7_m1', 'q7', 'user', '进度 100% 完成', 1);
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q7', 'pct', 1, 1)`,
    ).run();
    // 2 字查询 "%_" 中 % 与 _ 均被转义 → 仅匹配字面 "%_"；若无转义会命中全部
    const hits = sessionService.searchMessages('%_');
    expect(hits).toHaveLength(0);
    // 字面 % 命中（2 字英文 "% " 不可行 —— 用 "%、" 中文标点 + % 组合验证转义不报错）
    expect(() => sessionService.searchMessages('100%')).not.toThrow();
  });

  it('归档会话仍参与搜索（搜索不因归档缺结果）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at, archived) VALUES ('q8', '归档可搜', 1, 1, 1)`,
    ).run();
    insertMessage('q8_m1', 'q8', 'user', 'archivedkeyword 归档内容', 1);
    const hits = sessionService.searchMessages('archivedkeyword');
    expect(hits.some((r: any) => r.sessionId === 'q8')).toBe(true);
  });

  it('已删除会话的标题回退为占位文案（（已删除会话））', () => {
    // 消息引用已不存在的会话 id（真实库 FK 会阻止，此处验证 title 补全兜底）
    insertMessage('q9_m1', 'q9_ghost', 'user', 'ghostkeyword 消息', 1);
    const hits = sessionService.searchMessages('ghostkeyword');
    expect(hits.some((r: any) => r.sessionTitle === '（已删除会话）')).toBe(true);
  });

  it('单字符 CJK 查询走 LIKE 回退命中子串', () => {
    insertMessage('q10_m1', 'q10', 'user', '编程语言爱', 1);
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q10', '单字', 1, 1)`,
    ).run();
    const hits = sessionService.searchMessages('语');
    expect(hits.some((r: any) => r.lastMessageId === 'q10_m1')).toBe(true);
  });

  it('结果按 created_at 倒序（最新匹配排前）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q11', '排序', 1, 1)`,
    ).run();
    insertMessage('q11_m1', 'q11', 'user', 'orderkeyword 早', 10);
    insertMessage('q11_m2', 'q11', 'assistant', 'orderkeyword 晚', 20);
    const hits = sessionService.searchMessages('orderkeyword');
    expect(hits[0].lastMessageId).toBe('q11_m2');
    expect(hits[0].lastRole).toBe('assistant');
  });

  it('相同内容多会话命中时返回多个聚合结果', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q12', '甲', 1, 1)`,
    ).run();
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('q13', '乙', 1, 1)`,
    ).run();
    insertMessage('q12_m1', 'q12', 'user', 'sharedkw 内容', 1);
    insertMessage('q13_m1', 'q13', 'user', 'sharedkw 内容', 2);
    const hits = sessionService.searchMessages('sharedkw');
    expect(hits).toHaveLength(2);
  });
});

describe.skipIf(!dbAvailable)('审计日志导出（v0.5.0）', () => {
  let db: any;
  let dir: string;
  let auditService: any;

  beforeAll(async () => {
    const { AuditService } = await import('../audit.service');
    dir = mkdtempSync(join(tmpdir(), 'metona-audit-export-'));
    db = new Database(':memory:');
    db.exec(`
      CREATE TABLE audit_logs (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        session_id TEXT,
        iteration INTEGER,
        event_type TEXT NOT NULL,
        actor TEXT NOT NULL DEFAULT 'system',
        target TEXT NOT NULL,
        details TEXT,
        outcome TEXT,
        duration_ms INTEGER,
        created_at INTEGER NOT NULL,
        prev_hash TEXT,
        current_hash TEXT
      );
    `);
    auditService = new AuditService(() => db);
  });

  afterAll(() => {
    try {
      db?.close();
    } catch {
      /* ignore */
    }
    try {
      rmSync(dir, { recursive: true, force: true });
    } catch {
      /* ignore */
    }
  });

  it('exportJSONL 每行一条 JSON 记录（含链式哈希字段）', () => {
    auditService.log({
      sessionId: 's1',
      eventType: 'tool_call',
      actor: 'agent',
      target: 'run_command',
      details: { command: 'ls' },
      outcome: 'success',
      durationMs: 10,
    });
    auditService.log({
      sessionId: 's1',
      eventType: 'session_end',
      actor: 'agent',
      target: 'session',
      outcome: 'success',
    });

    const jsonl = auditService.exportJSONL();
    const lines = jsonl.trim().split('\n');
    expect(lines).toHaveLength(2);
    const first = JSON.parse(lines[0]);
    expect(first.event_type).toBe('tool_call');
    expect(first.session_id).toBe('s1');
    expect(first.current_hash).toMatch(/^[0-9a-f]{64}$/);
    // 第二条 prev_hash 等于第一条 current_hash（链完整保留在导出中）
    const second = JSON.parse(lines[1]);
    expect(second.prev_hash).toBe(first.current_hash);
  });

  it('exportCSV 含表头且 RFC 4180 转义（逗号/引号/换行字段）', () => {
    auditService.log({
      sessionId: 's2',
      eventType: 'error',
      actor: 'agent',
      target: 'target,with,commas',
      details: { msg: '含"双引号"和\n换行' },
      outcome: 'error',
    });

    const csv = auditService.exportCSV();
    const lines = csv.split('\n');
    // 表头
    expect(lines[0]).toBe(
      'id,session_id,iteration,event_type,actor,target,details,outcome,duration_ms,created_at,prev_hash,current_hash',
    );
    // 含特殊字符的 target 字段被双引号包裹
    expect(csv).toContain('"target,with,commas"');
    // details 存储为 JSON 字符串（内部双引号为 \" 转义），CSV 再转义后为 \""（反斜杠保留 + 引号翻倍）
    expect(csv).toContain('\\""双引号\\""');
    // 记录数与 JSONL 一致
    const parsed = auditService
      .exportJSONL()
      .trim()
      .split('\n')
      .map((l: string) => JSON.parse(l));
    expect(parsed.length).toBeGreaterThanOrEqual(3);
  });
});

describe.skipIf(!dbAvailable)('saveMessage id 透传与 updateMessageContent（R1 回归）', () => {
  let db: any;
  let sessionService: any;

  beforeAll(async () => {
    const { SessionService } = await import('../session.service');
    db = new Database(':memory:');
    db.exec(`
      CREATE TABLE sessions (
        id TEXT PRIMARY KEY,
        title TEXT DEFAULT '新会话',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL,
        message_count INTEGER DEFAULT 0,
        pinned INTEGER DEFAULT 0,
        archived INTEGER DEFAULT 0,
        metadata TEXT DEFAULT '{}'
      );
      CREATE TABLE messages (
        id TEXT PRIMARY KEY,
        session_id TEXT NOT NULL,
        role TEXT NOT NULL,
        content TEXT,
        reasoning_content TEXT,
        tool_calls TEXT,
        tool_result TEXT,
        attachments TEXT,
        iteration INTEGER,
        created_at INTEGER NOT NULL
      );
    `);
    sessionService = new SessionService(() => db);
  });

  afterAll(() => {
    try {
      db?.close();
    } catch {
      /* ignore */
    }
  });

  it('saveMessage 透传 id 时使用该 id 落库（R1 修复）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('r1s', 'r1', 1, 1)`,
    ).run();
    const saved = sessionService.saveMessage({
      sessionId: 'r1s',
      role: 'user',
      content: '前端生成的消息',
      id: 'custom-user-id',
    });
    expect(saved.id).toBe('custom-user-id');
    const rows = db.prepare(`SELECT id FROM messages WHERE id = 'custom-user-id'`).all();
    expect(rows).toHaveLength(1);
  });

  it('saveMessage 未传 id 时仍由 DB 生成 nanoid', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('r2s', 'r2', 1, 1)`,
    ).run();
    const saved = sessionService.saveMessage({
      sessionId: 'r2s',
      role: 'user',
      content: 'DB 生成 id',
    });
    expect(saved.id).toMatch(/^msg_/);
  });

  it('updateMessageContent 按透传 id 可命中（R1 完整链路）', () => {
    db.prepare(
      `INSERT INTO sessions (id, title, created_at, updated_at) VALUES ('r3s', 'r3', 1, 1)`,
    ).run();
    sessionService.saveMessage({
      sessionId: 'r3s',
      role: 'user',
      content: '原始内容',
      id: 'edit-target-id',
    });
    const updated = sessionService.updateMessageContent('r3s', 'edit-target-id', '编辑后');
    expect(updated).toBe(true);
    const row = db.prepare(`SELECT content FROM messages WHERE id = 'edit-target-id'`).get() as {
      content: string;
    };
    expect(row.content).toBe('编辑后');
  });
});