/**
 * AgentEngineManager 回归测试（v0.5.2）
 *
 * 背景：v0.4.0 P2-10 引入每会话懒创建引擎后，createEngine 未调用 setTools，
 * 且启动期 setToolsAll 调用时 engines Map 为空（全是 no-op）→ 新引擎 tools=[]
 * → LLM 请求不带工具定义 → 模型无法发起 tool_call，只能凭历史记忆"口头说要
 * 调工具"并瞎编结果。v0.5.2 在 createEngine 中从 registry 拉取工具修复。
 *
 * 本测试直接断言"传给 adapter.sendStream 的请求携带工具"——这是唯一能
 * 拦住该类回归的测试层级（引擎单测的 mock adapter 无条件吐 tool_call
 * 事件，会掩盖请求契约缺陷）。
 */

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

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

import { AgentEngineManager } from '../agent-engine-manager.service';
import type {
  IMetonaProviderAdapter,
  MetonaRequest,
  MetonaResponse,
  MetonaStreamEvent,
} from '../../harness/types';
import { MetonaStreamEventType } from '../../harness/types';
import { ToolRegistry } from '../../harness/tools/registry';
import type { IMetonaTool } from '../../harness/types/metona-tool';
import { MetonaToolCategory, MetonaRiskLevel } from '../../harness/types';

/** 记录请求的 mock adapter — runStream 完成后检查 requests 数组 */
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,
  };
}

function makeTool(name: string): IMetonaTool {
  return {
    definition: {
      name,
      description: `${name} (test fixture)`,
      parameters: { type: 'object', properties: {}, required: [] },
      category: MetonaToolCategory.FILESYSTEM,
      riskLevel: MetonaRiskLevel.SAFE,
      requiresPermission: false,
      timeoutMs: 5_000,
    },
    async execute() {
      return { ok: true };
    },
  };
}

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

describe('AgentEngineManager — 懒创建引擎的工具传递（v0.5.2 回归修复）', () => {
  it('新会话首次 sendMessage 时，LLM 请求必须携带 registry 中的工具定义', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);
    const registry = new ToolRegistry();
    registry.registerBuiltin(makeTool('read_file'));
    registry.registerBuiltin(makeTool('run_command'));

    // 模拟真实启动流程：manager 创建时 registry 已有工具，
    // 但引擎在首次 sendMessage 才懒创建（setToolsAll 此时是 no-op）
    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
      toolRegistry: registry,
    });

    const engine = manager.getEngine('sess-lazy-1');
    await engine.runStream(userMessage, 'sess-lazy-1', [], systemPrompt);

    // 核心断言：请求携带工具定义（回归点 — 修复前为 undefined）
    expect(requests).toHaveLength(1);
    expect(requests[0].tools).toBeDefined();
    expect(requests[0].tools!.map((t) => t.name)).toContain('read_file');
    expect(requests[0].tools!.map((t) => t.name)).toContain('run_command');
  });

  it('已禁用的工具不出现在懒创建引擎的请求中', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);
    const registry = new ToolRegistry();
    registry.registerBuiltin(makeTool('read_file'));
    registry.registerBuiltin(makeTool('web_browser'));
    registry.setToolEnabled('web_browser', false);

    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
      toolRegistry: registry,
    });

    const engine = manager.getEngine('sess-lazy-2');
    await engine.runStream(userMessage, 'sess-lazy-2', [], systemPrompt);

    expect(requests[0].tools).toBeDefined();
    expect(requests[0].tools!.map((t) => t.name)).toContain('read_file');
    expect(requests[0].tools!.map((t) => t.name)).not.toContain('web_browser');
  });

  it('setToolsAll 仍可热更新已存在的引擎（工具开关变更场景）', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);
    const registry = new ToolRegistry();
    registry.registerBuiltin(makeTool('read_file'));

    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
      toolRegistry: registry,
    });

    const engine = manager.getEngine('sess-hot');
    await engine.runStream(userMessage, 'sess-hot', [], systemPrompt);
    expect(requests[0].tools!.map((t) => t.name)).toContain('read_file');

    // 热更新：新注册工具 + setToolsAll 同步
    registry.registerBuiltin(makeTool('new_tool'));
    manager.setToolsAll(registry.listTools());

    requests.length = 0;
    await engine.runStream(userMessage, 'sess-hot', [], systemPrompt);
    expect(requests[0].tools!.map((t) => t.name)).toContain('new_tool');
  });

  it('无 toolRegistry 时请求不带 tools（纯对话配置，行为不回归）', async () => {
    const requests: MetonaRequest[] = [];
    const adapter = createRecordingAdapter(requests);

    const manager = new AgentEngineManager({
      buildAdapter: () => adapter,
      baseConfig: {},
    });

    const engine = manager.getEngine('sess-no-tools');
    await engine.runStream(userMessage, 'sess-no-tools', [], systemPrompt);

    expect(requests[0].tools).toBeUndefined();
  });
});