import * as fs from 'fs';
import * as path from 'path';
import { CONTROLLER_KEY, getClassMetadata } from '@midwayjs/core';
import { BaseController, CoolCommException, CurdOption } from '@cool-midway/core';
import { AiChatService } from '../../../src/modules/ai/service/chat';
import {
  OpenAiChatController,
  openAiChatCurdOption,
} from '../../../src/modules/ai/controller/open/chat';
import { AiChatRequest } from '../../../src/comm/types/omni';

/**
 * CoolController 元数据（脚本路径解析为异步）
 */
interface CoolControllerMeta {
  prefix?: string;
  curdOption?: CurdOption;
}

/**
 * 等待 CoolController 将 CRUD 配置写入类元数据
 */
async function waitCoolMeta(
  target: new (...args: never[]) => unknown
): Promise<CoolControllerMeta> {
  const started = Date.now();
  while (Date.now() - started < 2000) {
    const meta = getClassMetadata(CONTROLLER_KEY, target) as
      | CoolControllerMeta
      | undefined;
    if (meta?.curdOption) {
      return meta;
    }
    await new Promise<void>(resolve => setImmediate(resolve));
  }
  throw new Error(`${target.name} 的 CoolController 元数据未就绪`);
}

function serviceApiMethods(apis: CurdOption['serviceApis'] = []): string[] {
  return apis.map(api => (typeof api === 'string' ? api : api.method));
}

function userAsk(
  content: string,
  extra?: Partial<AiChatRequest>
): AiChatRequest {
  return {
    cardId: extra?.cardId ?? 101,
    locale: extra?.locale,
    messages: extra?.messages ?? [{ role: 'user', content }],
  };
}

describe('T36: 名片 AI 顾问对话 (modules/ai chat)', () => {
  describe('1. AiChatService.ask 入参校验', () => {
    let service: AiChatService;

    beforeEach(() => {
      service = new AiChatService();
    });

    it('缺 cardId 应抛 CoolCommException', async () => {
      await expect(
        service.ask({
          cardId: '' as unknown as number,
          messages: [{ role: 'user', content: 'hello' }],
        })
      ).rejects.toThrow(CoolCommException);

      await expect(
        service.ask({
          messages: [{ role: 'user', content: 'hello' }],
        } as AiChatRequest)
      ).rejects.toThrow(CoolCommException);
    });

    it('空 messages 应抛 CoolCommException', async () => {
      await expect(
        service.ask({ cardId: 101, messages: [] })
      ).rejects.toThrow(CoolCommException);

      await expect(
        service.ask({ cardId: 101, messages: undefined as unknown as [] })
      ).rejects.toThrow(CoolCommException);
    });

    it('最后一条非 user 或内容为空应抛 CoolCommException', async () => {
      await expect(
        service.ask({
          cardId: 101,
          messages: [{ role: 'assistant', content: 'hi' }],
        })
      ).rejects.toThrow(CoolCommException);

      await expect(
        service.ask({
          cardId: 101,
          messages: [{ role: 'user', content: '   ' }],
        })
      ).rejects.toThrow(CoolCommException);
    });
  });

  describe('2. RuleBased 回复与留资意图', () => {
    let service: AiChatService;

    beforeEach(() => {
      service = new AiChatService();
    });

    it('价格问题 shouldCollectLead=true，并引导留资', async () => {
      const result = await service.ask(userAsk('What is the price for a partnership?'));
      expect(result.shouldCollectLead).toBe(true);
      expect(result.reply).toBeTruthy();
      expect(result.locale).toBe('en-US');
    });

    it('合作 / 联系问题 shouldCollectLead=true', async () => {
      const coop = await service.ask(userAsk('想谈合作'));
      expect(coop.shouldCollectLead).toBe(true);

      const contact = await service.ask(
        userAsk('How can I contact you?', { locale: 'en-GB' })
      );
      expect(contact.shouldCollectLead).toBe(true);
      expect(contact.locale).toBe('en-GB');
    });

    it('普通问候 shouldCollectLead=false 且 reply 非空', async () => {
      const result = await service.ask(userAsk('hello'));
      expect(result.shouldCollectLead).toBe(false);
      expect(result.reply).toBeTruthy();
      expect(result.reply.trim().length).toBeGreaterThan(0);
      expect(result.locale).toBe('en-US');
    });

    it('locale 缺省为 en-US，英文回复不含中文', async () => {
      const result = await service.ask(userAsk('hi there'));
      expect(result.locale).toBe('en-US');
      expect(/[\u4e00-\u9fff]/.test(result.reply)).toBe(false);
    });

    it('zh-CN 回复含中文', async () => {
      const result = await service.ask(userAsk('你好', { locale: 'zh-CN' }));
      expect(result.locale).toBe('zh-CN');
      expect(result.shouldCollectLead).toBe(false);
      expect(/[\u4e00-\u9fff]/.test(result.reply)).toBe(true);
    });

    it('兼容 serviceApis 单对象入参', async () => {
      const body: AiChatRequest = {
        cardId: 88,
        locale: 'zh-CN',
        messages: [
          { role: 'system', content: 'concierge' },
          { role: 'user', content: '价格多少' },
        ],
      };
      const result = await service.ask(body);
      expect(result.shouldCollectLead).toBe(true);
      expect(/[\u4e00-\u9fff]/.test(result.reply)).toBe(true);
    });

    it('当 DeepSeekService 已配置时优先调用大模型，失败时平滑降级', async () => {
      const mockDeepSeek = {
        isConfigured: jest.fn().mockReturnValue(true),
        chatCompletion: jest.fn().mockResolvedValue('这是 DeepSeek 大模型生成的拟人顾问回复'),
      };
      service.deepSeekService = mockDeepSeek as any;

      const res = await service.ask(userAsk('你们都有什么服务？'));
      expect(res.reply).toBe('这是 DeepSeek 大模型生成的拟人顾问回复');
      expect(mockDeepSeek.chatCompletion).toHaveBeenCalled();

      // 测试异常平滑降级
      mockDeepSeek.chatCompletion.mockRejectedValue(new Error('Network error'));
      const fallbackRes = await service.ask(userAsk('你好', { locale: 'zh-CN' }));
      expect(fallbackRes.reply).toBeTruthy();
      expect(fallbackRes.reply).toContain('智能顾问');
    });
  });

  describe('3. OpenAiChatController /open/ai/chat', () => {
    const controllerFile = path.join(
      __dirname,
      '../../../src/modules/ai/controller/open/chat.ts'
    );

    let meta: CoolControllerMeta;
    let option: CurdOption;

    beforeAll(async () => {
      meta = await waitCoolMeta(OpenAiChatController);
      option = meta.curdOption as CurdOption;
    });

    it('文件路径应符合 /open/ai/chat 自动路由约定', () => {
      expect(fs.existsSync(controllerFile)).toBe(true);
      expect(controllerFile.replace(/\\/g, '/')).toMatch(
        /modules\/ai\/controller\/open\/chat\.ts$/
      );
    });

    it('路由前缀应为 /open/ai/chat', () => {
      expect(meta.prefix).toBe('/open/ai/chat');
    });

    it('控制器应继承 BaseController，绑定 AiChatService，不开 CRUD', () => {
      expect(OpenAiChatController.prototype).toBeInstanceOf(BaseController);
      expect(option.service).toBe(AiChatService);
      expect(openAiChatCurdOption.service).toBe(AiChatService);
      expect(option.api || []).toEqual([]);
    });

    it('serviceApis 应包含 ask', () => {
      const methods = serviceApiMethods(option.serviceApis);
      expect(methods).toContain('ask');
    });
  });
});