import type { IncomingMessage, ServerResponse } from 'node:http';
import { Readable } from 'node:stream';
import { beforeEach, describe, expect, it, vi } from 'vitest';
import { createLearningRouteHandler } from '@electron/api/routes/learning';

function createResponse() {
  const chunks: string[] = [];
  const res = {
    statusCode: 0,
    setHeader: vi.fn(),
    end: vi.fn((chunk?: string) => {
      if (chunk) chunks.push(chunk);
    }),
  } as unknown as ServerResponse;
  return {
    res,
    get json() {
      return JSON.parse(chunks.join('')) as Record<string, unknown>;
    },
  };
}

describe('Learning Main route boundary', () => {
  const fetchImpl = vi.fn<typeof fetch>();
  const getAccessToken = vi.fn();

  beforeEach(() => {
    fetchImpl.mockReset();
    getAccessToken.mockReset();
  });

  it('does not claim unrelated routes', async () => {
    const handler = createLearningRouteHandler({ fetchImpl, getAccessToken });
    const response = createResponse();

    await expect(handler(
      { method: 'GET' } as IncomingMessage,
      response.res,
      new URL('http://127.0.0.1/api/works/projects'),
      {} as never,
    )).resolves.toBe(false);
    expect(fetchImpl).not.toHaveBeenCalled();
  });

  it('forwards catalog reads with a Main-owned access token', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(new Response(JSON.stringify([]), {
      status: 200,
      headers: { 'Content-Type': 'application/json' },
    }));
    const handler = createLearningRouteHandler({
      fetchImpl,
      getAccessToken,
      apiBaseUrl: 'https://square.example/',
    });
    const response = createResponse();

    await expect(handler(
      { method: 'GET' } as IncomingMessage,
      response.res,
      new URL('http://127.0.0.1/api/works/learning/courses?limit=24&unknown=no'),
      {} as never,
    )).resolves.toBe(true);

    expect(fetchImpl).toHaveBeenCalledWith(
      'https://square.example/api/learning/courses?limit=24',
      expect.objectContaining({
        method: 'GET',
        headers: {
          Accept: 'application/json',
          Authorization: 'Bearer works-token',
        },
      }),
    );
    expect(response.json).toEqual({ success: true, data: [] });
  });

  it('refreshes once after an upstream 401', async () => {
    getAccessToken.mockResolvedValueOnce('expired-token').mockResolvedValueOnce('new-token');
    fetchImpl
      .mockResolvedValueOnce(new Response(JSON.stringify({ detail: 'expired' }), { status: 401 }))
      .mockResolvedValueOnce(new Response(JSON.stringify([]), { status: 200 }));
    const handler = createLearningRouteHandler({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const response = createResponse();

    await handler(
      { method: 'GET' } as IncomingMessage,
      response.res,
      new URL('http://127.0.0.1/api/works/learning/courses'),
      {} as never,
    );

    expect(getAccessToken).toHaveBeenNthCalledWith(2, { fetchImpl, forceRefresh: true });
    expect(fetchImpl).toHaveBeenCalledTimes(2);
    expect(response.json).toMatchObject({ success: true });
  });

  it('returns a stable auth error without contacting the service', async () => {
    getAccessToken.mockResolvedValue(null);
    const handler = createLearningRouteHandler({ fetchImpl, getAccessToken });
    const response = createResponse();

    await handler(
      { method: 'GET' } as IncomingMessage,
      response.res,
      new URL('http://127.0.0.1/api/works/learning/courses'),
      {} as never,
    );

    expect(response.res.statusCode).toBe(401);
    expect(response.json).toMatchObject({ code: 'LEARNING_AUTH_REQUIRED' });
    expect(fetchImpl).not.toHaveBeenCalled();
  });

  it('forwards single-course generation without exposing the token to Renderer', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(new Response(JSON.stringify({
      jobId: 'job-1', status: 'queued', done: false,
    }), { status: 202, headers: { 'Content-Type': 'application/json' } }));
    const handler = createLearningRouteHandler({
      fetchImpl,
      getAccessToken,
      apiBaseUrl: 'https://square.example',
    });
    const options = {
      requirement: '互动讲解二次函数',
      enableWebSearch: false,
      enableImageGeneration: true,
      enableVideoGeneration: false,
      enableTTS: true,
      interactiveMode: true,
      taskEngineMode: false,
    };
    const request = Readable.from([JSON.stringify(options)]) as IncomingMessage;
    request.method = 'POST';
    const response = createResponse();

    await handler(
      request,
      response.res,
      new URL('http://127.0.0.1/api/works/learning/generations'),
      {} as never,
    );

    expect(fetchImpl).toHaveBeenCalledWith(
      'https://square.example/api/learning/generations',
      expect.objectContaining({
        method: 'POST',
        body: JSON.stringify(options),
        headers: expect.objectContaining({ Authorization: 'Bearer works-token' }),
      }),
    );
    expect(response.res.statusCode).toBe(202);
  });

  it.each(['cancel', 'resume'])('forwards the generation %s control operation without a body', async (operation) => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(new Response(JSON.stringify({
      jobId: 'job-1',
      status: operation === 'cancel' ? 'cancelled' : 'queued',
      done: operation === 'cancel',
    }), { status: 200 }));
    const handler = createLearningRouteHandler({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const response = createResponse();

    await handler(
      { method: 'POST' } as IncomingMessage,
      response.res,
      new URL(`http://127.0.0.1/api/works/learning/generations/job-1/${operation}`),
      {} as never,
    );

    expect(fetchImpl).toHaveBeenCalledWith(
      `https://square.example/api/learning/generations/job-1/${operation}`,
      expect.objectContaining({ method: 'POST', headers: expect.objectContaining({ Authorization: 'Bearer works-token' }) }),
    );
    expect(fetchImpl.mock.calls[0][1]).not.toHaveProperty('body');
  });
});