/**
 * AuditService 单元测试（P1-14 测试基线）
 * 覆盖：链式哈希生成与验证、篡改检测
 *
 * 注意：better-sqlite3 为原生模块——若本机安装的构建与系统 Node ABI 不匹配，
 * 测试自动跳过（skipIf），避免误报失败。
 */

import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { mkdtempSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import log from 'electron-log';

// better-sqlite3 加载失败时（ABI 不匹配）自动跳过整个套件
// 注意：require 成功不代表原生绑定可用（Electron ABI vs 系统 Node ABI），
// 需实际构造一次内存库验证
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;
}

// electron-log 在纯 Node 环境静默（false = 禁用该 transport）
log.transports.console.level = false;
log.transports.file.level = false;

describe.skipIf(!dbAvailable)('AuditService 链式哈希', () => {
  let dir: string;
  // eslint-disable 是失效指令（测试文件 overrides 已关闭 no-explicit-any），已移除
  let db: any;
  let service: any;

  beforeAll(async () => {
    const { AuditService } = await import('../../services/audit.service');
    dir = mkdtempSync(join(tmpdir(), 'metona-audit-'));
    // 手动建库（绕过 DatabaseService 的 electron 依赖）
    db = new Database(join(dir, 'test.db'));
    db.exec(`
      CREATE TABLE IF NOT EXISTS 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 DEFAULT (unixepoch() * 1000),
        prev_hash       TEXT,
        current_hash    TEXT
      );
      CREATE TRIGGER IF NOT EXISTS audit_no_delete BEFORE DELETE ON audit_logs
      BEGIN
        SELECT RAISE(ABORT, 'Audit logs are INSERT-ONLY.');
      END;
    `);
    service = new AuditService(() => db);
  });

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

  it('写入审计日志并生成链式哈希', () => {
    service.log({
      sessionId: 's1',
      eventType: 'tool_call',
      actor: 'agent',
      target: 'read_file',
      details: { file: 'a.ts' },
      outcome: 'success',
    });
    const rows = db.prepare('SELECT * FROM audit_logs').all();
    expect(rows.length).toBe(1);
    expect(rows[0].current_hash).toBeTruthy();
    // 首条 prev_hash 为 64 个 0 的创世哨兵（getLastHash 空表回退值）
    expect(rows[0].prev_hash).toBe('0'.repeat(64));
  });

  it('第二条记录的 prev_hash 链接前一条', () => {
    service.log({
      sessionId: 's1',
      eventType: 'tool_call',
      actor: 'agent',
      target: 'write_file',
      details: { file: 'b.ts' },
      outcome: 'success',
    });
    const rows = db.prepare('SELECT * FROM audit_logs ORDER BY id').all();
    expect(rows.length).toBe(2);
    expect(rows[1].prev_hash).toBe(rows[0].current_hash);
  });

  it('verifyChain 对完整链返回 valid', () => {
    const result = service.verifyChain();
    expect(result.valid).toBe(true);
    expect(result.totalRecords).toBe(2);
  });

  it('篡改记录后 verifyChain 检测到 tampered', () => {
    // 需要先 drop 触发器才能 UPDATE（INSERT-ONLY 约束）
    db.exec('DROP TRIGGER audit_no_delete');
    db.prepare('UPDATE audit_logs SET details = ? WHERE id = 1').run('{"tampered": true}');
    db.exec(`CREATE TRIGGER audit_no_delete BEFORE DELETE ON audit_logs
      BEGIN SELECT RAISE(ABORT, 'Audit logs are INSERT-ONLY.'); END`);
    const result = service.verifyChain();
    expect(result.valid).toBe(false);
  });
});