import { ConflictException, NotFoundException } from '@nestjs/common';
import { AiChatService } from './ai-chat.service';

const authenticatedUser = {
  id: 7,
  username: 'tester',
  permissions: ['ai:chat:use'],
  isSuperAdmin: false,
};

function createService(conversationOverrides: Record<string, unknown> = {}) {
  const conversations = {
    findOne: jest.fn(),
    find: jest.fn(),
    create: jest.fn((value) => value),
    save: jest.fn(async (value) => ({ id: 1, ...value })),
    remove: jest.fn(),
    ...conversationOverrides,
  };
  const service = new AiChatService(
    conversations as never,
    { exists: jest.fn().mockResolvedValue(false) } as never,
    {} as never,
    {} as never,
    {} as never,
    {} as never,
    {} as never,
  );
  return { service, conversations };
}

describe('AiChatService', () => {
  it('按 userId 查询会话，无法借 id 访问其他用户会话', async () => {
    const { service, conversations } = createService({ findOne: jest.fn().mockResolvedValue(null) });
    await expect(service.getMessages(7, 99)).rejects.toBeInstanceOf(NotFoundException);
    expect(conversations.findOne).toHaveBeenCalledWith({ where: { id: 99, userId: 7 } });
  });

  it('生成中的会话禁止删除', async () => {
    const entity = { id: 2, userId: 7 };
    const { service, conversations } = createService({ findOne: jest.fn().mockResolvedValue(entity) });
    (service as unknown as { activeConversations: Set<number> }).activeConversations.add(2);
    await expect(service.deleteConversation(7, 2)).rejects.toBeInstanceOf(ConflictException);
    expect(conversations.remove).not.toHaveBeenCalled();
  });

  it('并发获取同一会话时只允许一个请求进入生成流程', async () => {
    let resolveExists!: (value: boolean) => void;
    const exists = jest.fn(
      () => new Promise<boolean>((resolve) => {
        resolveExists = resolve;
      }),
    );
    const { service } = createService();
    (service as unknown as { messages: { exists: typeof exists } }).messages.exists = exists;
    const acquire = (service as unknown as { acquireConversation(id: number): Promise<void> })
      .acquireConversation.bind(service);

    const first = acquire(5);
    await expect(acquire(5)).rejects.toBeInstanceOf(ConflictException);
    resolveExists(false);
    await expect(first).resolves.toBeUndefined();
  });

  it('工具摘要脱敏并限制长度', () => {
    const { service } = createService();
    const summarize = (service as unknown as { summarize(value: unknown): string }).summarize.bind(service);
    const summary = summarize({
      phone: '13800138000',
      idCard: '11010519491231002X',
      note: `联系电话 13900139000 ${'x'.repeat(3000)}`,
      apiKey: 'sk-sensitive-value',
    });
    expect(summary).not.toContain('13800138000');
    expect(summary).not.toContain('13900139000');
    expect(summary).not.toContain('11010519491231002X');
    expect(summary).not.toContain('sk-sensitive-value');
    expect(summary.length).toBeLessThanOrEqual(2000);
  });

  it.each([
    { abort: false, expectedStatus: 'failed', expectedCode: 'UPSTREAM_ERROR' },
    { abort: true, expectedStatus: 'cancelled', expectedCode: 'CLIENT_ABORTED' },
  ])('流中断后保存已生成内容和 $expectedStatus 状态', async ({ abort, expectedStatus, expectedCode }) => {
    const conversation = { id: 3, userId: 7, title: '测试', lastMessageAt: null };
    const assistant = {
      id: 12,
      conversationId: 3,
      role: 'assistant',
      content: '',
      reasoningContent: null,
      status: 'pending',
      errorCode: null,
    };
    const messageSave = jest.fn(async (value) => value);
    const messages = {
      exists: jest.fn().mockResolvedValue(false),
      find: jest.fn().mockResolvedValue([]),
      save: messageSave,
    };
    const manager = {
      create: jest.fn((_entity, value) => value),
      save: jest
        .fn()
        .mockResolvedValueOnce({ id: 11, conversationId: 3, role: 'user', content: '查询' })
        .mockResolvedValueOnce(assistant),
      update: jest.fn(),
    };
    const abortController = new AbortController();
    const modelStream = {
      stream: async function* () {
        yield { type: 'content' as const, delta: '部分回答' };
        if (abort) {
          abortController.abort(new Error('client disconnected'));
          yield { type: 'complete' as const, toolCalls: [] };
          return;
        }
        throw new Error('upstream failed');
      },
    };
    const service = new AiChatService(
      { findOne: jest.fn().mockResolvedValue(conversation) } as never,
      messages as never,
      { save: jest.fn() } as never,
      { transaction: jest.fn(async (callback) => callback(manager)) } as never,
      { getRuntimeConfig: jest.fn().mockResolvedValue({}) } as never,
      { listAvailable: jest.fn().mockReturnValue([]) } as never,
      modelStream as never,
    );
    const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
    const run = service.streamMessage(
      authenticatedUser as never,
      3,
      '查询',
      abortController.signal,
      (event, data) => emitted.push({ event, data }),
      jest.fn(),
    );

    if (abort) await expect(run).resolves.toBeUndefined();
    else await expect(run).rejects.toThrow('upstream failed');

    expect(messageSave).toHaveBeenCalledWith(
      expect.objectContaining({
        id: 12,
        content: '部分回答',
        status: expectedStatus,
        errorCode: expectedCode,
      }),
    );
    expect(emitted.some(({ event }) => event === 'content.delta')).toBe(true);
    expect(emitted.some(({ event }) => event === 'message.cancelled')).toBe(abort);
  });
});