/**
 * MCP 工具动态变更 × 引擎同步测试（v0.5.3）
 *
 * 背景：MCP 工具在运行中增删（添加/断开/启停 server）后，已存在引擎的
 * 工具列表不会自动更新 —— setToolsAll 只在启动期与工具开关时被调用。
 * 后果：已打开会话拿不到新 MCP 工具，或持有已断开 server 的失效工具定义。
 * v0.5.3 修复：MCPManager.setOnToolsChanged 回调，连接/断开后同步全部引擎。
 *
 * 测试策略：mock MCP SDK（Client/StdioClientTransport），用真实的
 * MCPManager + ToolRegistry + AgentEngineManager 端到端验证 ——
 * 先创建会话引擎（复现"已打开会话"），再连接 MCP server，断言引擎请求
 * 的 tools 集合动态更新。
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';

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

// ===== Mock MCP SDK =====
const mockConnect = vi.fn(async () => undefined);
const mockListTools = vi.fn(async () => ({
  tools: [
    {
      name: 'search_docs',
      description: 'Search documentation',
      inputSchema: { type: 'object', properties: { query: { type: 'string' } } },
    },
  ],
}));
const mockClose = vi.fn(async () => undefined);

vi.mock('@modelcontextprotocol/sdk/client/index.js', () => ({
  Client: class {
    connect = mockConnect;
    listTools = mockListTools;
    close = mockClose;
    callTool = vi.fn(async () => ({ content: [] }));
  },
}));

vi.mock('@modelcontextprotocol/sdk/client/stdio.js', () => ({
  StdioClientTransport: class {
    // 测试不真实 spawn 子进程（真实 stdio 会拉起 npx 进程）
  },
}));

import { MCPManager } from '../../../services/mcp-manager.service';
import { AgentEngineManager } from '../../../services/agent-engine-manager.service';
import { ToolRegistry } from '../registry';
import type {
  IMetonaProviderAdapter,
  MetonaRequest,
  MetonaResponse,
  MetonaStreamEvent,
} from '../../types';
import { MetonaStreamEventType } from '../../types';
import { mkdtempSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';

// connectServer 成功后会写 mcp_servers 表（last_connected）— 用真实 :memory: SQLite
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;
}

/** 记录请求的 mock adapter */
function createRecordingAdapter(requests: MetonaRequest[]): IMetonaProviderAdapter {
  return {
    providerId: 'mock',
    supportedModels: ['mock-model'],
    supportsToolCalling: true,
    supportsThinking: false,
    getContextWindow: () => 1_000_000,
    send: vi.fn(
      async (): Promise<MetonaResponse> => ({
        meta: { requestId: 'r', provider: 'mock', model: 'm', latencyMs: 1, timestamp: Date.now() },
        content: 'ok',
        usage: { inputTokens: 1, outputTokens: 1, totalTokens: 2 },
        finishReason: 'stop' as never,
      }),
    ),
    sendStream: vi.fn(async function* (req: MetonaRequest): AsyncIterable<MetonaStreamEvent> {
      requests.push(req);
      yield {
        type: MetonaStreamEventType.TEXT_DELTA,
        requestId: 'r',
        sessionId: req.meta.sessionId,
        iteration: req.meta.iteration,
        seq: 0,
        timestamp: Date.now(),
        delta: 'done',
      };
      yield {
        type: MetonaStreamEventType.DONE,
        requestId: 'r',
        sessionId: req.meta.sessionId,
        iteration: req.meta.iteration,
        seq: 1,
        timestamp: Date.now(),
      };
    }),
    setAbortSignal: vi.fn(),
    healthCheck: async () => true,
  };
}

const userMessage = { role: 'user' as const, content: 'hello', timestamp: Date.now() };
const systemPrompt = { roleDefinition: '', outputConstraints: '', safetyGuidelines: '' };

describe.skipIf(!dbAvailable)('MCP 工具动态变更 × 引擎同步（v0.5.3）', () => {
  let db: any;
  let dir: string;

  beforeEach(() => {
    mockConnect.mockClear();
    mockListTools.mockClear();
    mockClose.mockClear();
    dir = mkdtempSync(join(tmpdir(), 'metona-mcp-sync-'));
    db = new Database(':memory:');
    db.exec(`
      CREATE TABLE mcp_servers (
        id TEXT PRIMARY KEY, name TEXT NOT NULL UNIQUE,
        transport TEXT NOT NULL, command TEXT, args TEXT, url TEXT, headers TEXT,
        enabled INTEGER NOT NULL DEFAULT 1, last_connected INTEGER, error_message TEXT,
        created_at INTEGER NOT NULL DEFAULT 0, updated_at INTEGER NOT NULL DEFAULT 0
      );
    `);
  });

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

  it('运行中连接 MCP server 后，已存在引擎的工具列表动态更新', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);
    const registry = new ToolRegistry();
    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
      toolRegistry: registry,
    });
    const mcpManager = new MCPManager(() => db, registry);

    // v0.5.3 的接线：MCP 工具变更 → 同步全部已存在引擎
    mcpManager.setOnToolsChanged(() => {
      manager.setToolsAll(registry.listTools());
    });

    // 1. 用户先打开会话（引擎已存在，此时无 MCP 工具）
    const engine = manager.getEngine('sess-mcp');
    await engine.runStream(userMessage, 'sess-mcp', [], systemPrompt);
    expect(requests[0].tools ?? []).toHaveLength(0);

    // 2. 运行中添加并连接 MCP server（复现 ipc/mcp.ts addServer 路径）
    await mcpManager.connectServer({
      id: 'mcp_test',
      name: 'test-server',
      transport: 'stdio',
      command: 'npx',
      args: ['-y', 'some-mcp-server'],
      enabled: true,
    });

    // 3. 同一会话再发消息 —— 引擎请求携带新 MCP 工具（修复点：
    //    v0.5.3 之前此处仍为空，需新建会话才能拿到）
    requests.length = 0;
    await engine.runStream(userMessage, 'sess-mcp', [], systemPrompt);
    const toolNames = (requests[0].tools ?? []).map((t) => t.name);
    expect(toolNames).toContain('mcp_test-server_search_docs');
  });

  it('断开 MCP server 后，已存在引擎移除失效工具定义', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);
    const registry = new ToolRegistry();
    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
      toolRegistry: registry,
    });
    const mcpManager = new MCPManager(() => db, registry);
    mcpManager.setOnToolsChanged(() => {
      manager.setToolsAll(registry.listTools());
    });

    // 连接 → 引擎拿到工具
    await mcpManager.connectServer({
      id: 'mcp_test2',
      name: 'srv2',
      transport: 'stdio',
      command: 'npx',
      args: [],
      enabled: true,
    });
    const engine = manager.getEngine('sess-mcp2');
    await engine.runStream(userMessage, 'sess-mcp2', [], systemPrompt);
    expect((requests[0].tools ?? []).length).toBeGreaterThan(0);

    // 断开 → 引擎的后续请求不再携带失效工具（修复点：此前引擎持有
    // 失效定义，模型发起调用时才报 Unknown tool）
    await mcpManager.disconnectServer('srv2');
    requests.length = 0;
    await engine.runStream(userMessage, 'sess-mcp2', [], systemPrompt);
    expect(requests[0].tools ?? []).toHaveLength(0);
  });

  it('回调抛异常不影响 MCP 连接主流程（防御性）', async () => {
    const registry = new ToolRegistry();
    const mcpManager = new MCPManager(() => db, registry);
    mcpManager.setOnToolsChanged(() => {
      throw new Error('callback exploded');
    });

    // 连接仍成功（回调失败仅记录日志）
    await expect(
      mcpManager.connectServer({
        id: 'mcp_test3',
        name: 'srv3',
        transport: 'stdio',
        command: 'npx',
        args: [],
        enabled: true,
      }),
    ).resolves.toBeUndefined();
    expect(registry.listTools().length).toBeGreaterThan(0);
  });
});