/**
 * 配置分层测试（v0.7.2 覆盖补齐 —— config.service / global-config.service 此前零测试）
 *
 * 锁定跨工作空间配置层契约（v0.3.17 引入的分层机制的回归防线）：
 * 1. 读取顺序：工作空间 DB → 全局 JSON（仅全局 key）
 * 2. 空值回退：DB 被 seedDefaults 灌入空值/默认值时回退全局层真实值
 * 3. 双写：set 同步写 DB 与全局 JSON；敏感 key 双侧密文
 * 4. getAll 合并语义与 migrateFromWorkspaceDB 幂等迁移
 * 5. 敏感 key 加密回环（P0-1）
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { readFileSync, rmSync } from 'fs';
import { join } from 'path';
import Database from 'better-sqlite3';

// better-sqlite3 的 ABI 可用性在模块顶层探测（describe.skipIf 在注册期求值）
let dbAvailable = false;
try {
  // eslint-disable-next-line @typescript-eslint/no-require-imports
  const DatabaseProbe = require('better-sqlite3');
  new DatabaseProbe(':memory:').close();
  dbAvailable = true;
} catch {
  dbAvailable = false;
}

// 可控 safeStorage（可逆 fake：enc: 前缀）+ 可定位的 userData 目录。
// 注意：mock 工厂内不允许 require（仓库 lint 禁令），os/path/fs 经参数注入。
const mockState = vi.hoisted(() => ({
  encryptionAvailable: true,
  userDataDir: '',
}));
vi.mock('electron', async () => {
  const { mkdtempSync } = await import('fs');
  const { join } = await import('path');
  const { tmpdir } = await import('os');
  mockState.userDataDir = mkdtempSync(join(tmpdir(), 'metona-gcfg-'));
  return {
    app: { getPath: () => mockState.userDataDir },
    safeStorage: {
      isEncryptionAvailable: () => mockState.encryptionAvailable,
      encryptString: (value: string) => Buffer.from(`enc:${value}`, 'utf-8'),
      decryptString: (buffer: Buffer) => {
        const raw = buffer.toString('utf-8');
        if (!raw.startsWith('enc:')) throw new Error('decryption failed');
        return raw.slice(4);
      },
    },
  };
});

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

import { ConfigService } from '../config.service';
import {
  GlobalConfigService,
  isGlobalKey,
  isUnconfiguredGlobalKey,
} from '../global-config.service';

// better-sqlite3 的默认导出同时是构造函数与命名空间 —— 实例类型经
// InstanceType<typeof Database> 获取，避免与命名空间冲突
type SqliteDatabase = InstanceType<typeof Database>;

let db: SqliteDatabase | undefined;
let globalConfig: GlobalConfigService;
let configService: ConfigService;
let tempRoots: string[] = [];

function makeDb(): SqliteDatabase {
  const db = new Database(':memory:');
  db.exec(`
    CREATE TABLE app_config (
      key TEXT PRIMARY KEY,
      value TEXT NOT NULL,
      category TEXT NOT NULL DEFAULT 'general',
      updated_at INTEGER NOT NULL DEFAULT 0
    );
  `);
  return db;
}

beforeEach(() => {
  if (!dbAvailable) return;
  // 测试隔离：清除上一个用例落盘的全局 JSON（GLOBAL_CONFIG_FILE 在模块导入期
  // 固化为单一路径，文件内状态会跨用例泄漏 —— 迁移用例会误判"已有 key"）
  rmSync(join(mockState.userDataDir, 'global-config.json'), { force: true });
  db = makeDb();
  globalConfig = new GlobalConfigService();
  globalConfig.initialize();
  configService = new ConfigService(() => db!);
  configService.setGlobalConfig(globalConfig);
});

afterEach(() => {
  if (db) db.close();
  for (const dir of tempRoots) {
    try {
      rmSync(dir, { recursive: true, force: true });
    } catch {
      /* ignore */
    }
  }
  tempRoots = [];
});

describe.skipIf(!dbAvailable)('isGlobalKey / isUnconfiguredGlobalKey — 全局 key 判定', () => {
  it('llm./agent./ui./security./onboarding. 前缀为全局 key；tasks/searxng 不属于', () => {
    expect(isGlobalKey('llm.provider')).toBe(true);
    expect(isGlobalKey('agent.maxIterations')).toBe(true);
    expect(isGlobalKey('onboarding.completed')).toBe(true);
    expect(isGlobalKey('searxng.enabled')).toBe(false);
    expect(isGlobalKey('tools.write_file.enabled')).toBe(false);
  });

  it('空串/null/默认值视为未配置（触发全局回退）；非默认值视为已配置', () => {
    expect(isUnconfiguredGlobalKey('llm.apiKey', '')).toBe(true);
    expect(isUnconfiguredGlobalKey('llm.apiKey', null)).toBe(true);
    expect(isUnconfiguredGlobalKey('agent.maxIterations', 20)).toBe(true); // seedDefaults 默认值
    expect(isUnconfiguredGlobalKey('agent.maxIterations', 50)).toBe(false); // 用户主动设置
    expect(isUnconfiguredGlobalKey('llm.apiKey', 'sk-real')).toBe(false);
  });
});

describe.skipIf(!dbAvailable)('ConfigService — 基本读写与敏感加密', () => {
  it('set/get 回环（JSON 序列化语义）', () => {
    configService.set('llm.model', 'deepseek-v4-pro');
    expect(configService.get<string>('llm.model')).toBe('deepseek-v4-pro');

    configService.set('agent.maxIterations', 33);
    expect(configService.get<number>('agent.maxIterations')).toBe(33);
  });

  it('敏感 key 落盘为密文、读取自动解密（P0-1）', () => {
    configService.set('llm.apiKey', 'sk-plain-secret');

    const raw = db!.prepare("SELECT value FROM app_config WHERE key = 'llm.apiKey'").get() as {
      value: string;
    };
    expect(raw.value).toContain('metona-enc:v1:'); // DB 内是密文
    expect(raw.value).not.toContain('sk-plain-secret');
    expect(configService.get<string>('llm.apiKey')).toBe('sk-plain-secret'); // 读取解密
  });

  it('get 未配置 key 返回 null（无全局回退对象时）', () => {
    expect(configService.get<string>('nonexistent.key')).toBeNull();
  });

  it('set 保留已有 category（不回退默认值）', () => {
    db!
      .prepare(
        "INSERT INTO app_config (key, value, category) VALUES ('ui.theme', '\"dark\"', 'ui')",
      )
      .run();
    configService.set('ui.theme', 'light');
    const row = db!.prepare("SELECT category FROM app_config WHERE key = 'ui.theme'").get() as {
      category: string;
    };
    expect(row.category).toBe('ui');
  });
});

describe.skipIf(!dbAvailable)('配置分层 — DB 与全局 JSON 回退/双写', () => {
  it('DB miss + 全局层有值 → 回退全局层', () => {
    globalConfig.set('llm.provider', 'deepseek');
    expect(configService.get<string>('llm.provider')).toBe('deepseek');
  });

  it('DB 有真实值 → 不回退（DB 优先）', () => {
    globalConfig.set('llm.provider', 'deepseek');
    configService.set('llm.provider', 'ollama');
    expect(configService.get<string>('llm.provider')).toBe('ollama');
  });

  it('DB 有 seedDefaults 空值 + 全局层有真实值 → 回退全局层（新工作空间场景）', () => {
    // 模拟新工作空间 DB 被 seedDefaults 灌入空 apiKey
    db!
      .prepare("INSERT INTO app_config (key, value, category) VALUES ('llm.apiKey', '\"\"', 'llm')")
      .run();
    globalConfig.set('llm.apiKey', 'sk-global-real');
    expect(configService.get<string>('llm.apiKey')).toBe('sk-global-real');
  });

  it('set 全局 key 双写：DB + 全局 JSON（跨工作空间共享）', () => {
    configService.set('llm.model', 'mimo-v2.5');

    // DB 有值
    expect(configService.get<string>('llm.model')).toBe('mimo-v2.5');
    // 全局 JSON 有值（新 ConfigService 实例 + 空 DB 可读到）
    const db2 = makeDb();
    const freshConfig = new ConfigService(() => db2);
    freshConfig.setGlobalConfig(globalConfig);
    expect(freshConfig.get<string>('llm.model')).toBe('mimo-v2.5');
    db2.close();
  });

  it('非全局 key 不写全局层（工作空间级数据不跨空间泄漏）', () => {
    configService.set('workspace.path', '/tmp/private');
    expect(globalConfig.get<string>('workspace.path')).toBeNull();
  });

  it('getAll 合并：DB 为主，miss 的全局 key 用全局层补齐', () => {
    configService.set('ui.theme', 'dark');
    globalConfig.set('llm.provider', 'openai');
    const all = configService.getAll();
    expect(all['ui.theme']).toBe('dark');
    expect(all['llm.provider']).toBe('openai');
  });

  it('getAll 中敏感 key 解密返回明文（配合导出层脱敏）', () => {
    configService.set('llm.apiKey', 'sk-export-test');
    expect(configService.getAll()['llm.apiKey']).toBe('sk-export-test');
  });
});

describe.skipIf(!dbAvailable)('migrateFromWorkspaceDB — 幂等迁移', () => {
  it('仅迁移已配置的全局 key；空值/默认值/既有 key 跳过', () => {
    // 构造工作空间 DB 配置快照
    const workspaceConfig: Record<string, unknown> = {
      'llm.provider': 'deepseek', // 已配置 → 迁移
      'llm.apiKey': '', // 空值 → 跳过
      'agent.maxIterations': 20, // seedDefaults 默认值 → 跳过
      'agent.confirmationTimeoutMs': 300000, // 用户设置的非默认值 → 迁移
      'searxng.enabled': true, // 非全局 key → 跳过
    };

    const migrated = globalConfig.migrateFromWorkspaceDB(workspaceConfig);
    expect(migrated).toBe(2);
    expect(globalConfig.get('llm.provider')).toBe('deepseek');
    expect(globalConfig.get('agent.confirmationTimeoutMs')).toBe(300000);
    expect(globalConfig.get('llm.apiKey')).toBeNull();

    // 幂等：第二次迁移 0 条（既有 key 不覆盖）
    expect(globalConfig.migrateFromWorkspaceDB(workspaceConfig)).toBe(0);
  });

  it('全局层已有真实值时不被迁移覆盖', () => {
    globalConfig.set('llm.provider', 'anthropic');
    const migrated = globalConfig.migrateFromWorkspaceDB({ 'llm.provider': 'deepseek' });
    expect(migrated).toBe(0);
    expect(globalConfig.get('llm.provider')).toBe('anthropic');
  });
});

describe.skipIf(!dbAvailable)('敏感 key — 全局层密文落盘', () => {
  it('全局 JSON 文件中敏感值为密文（无明文泄漏）', () => {
    configService.set('llm.apiKey', 'sk-raw-in-global');

    // GlobalConfigService flush 后，磁盘上的 global-config.json 不应包含明文
    const rawFile = readFileSync(join(mockState.userDataDir, 'global-config.json'), 'utf-8');
    expect(rawFile).not.toContain('sk-raw-in-global');
    expect(rawFile).toContain('metona-enc:v1:');
  });
});