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

vi.mock('electron', () => ({
  app: { getPath: vi.fn(() => 'C:\\Downloads') },
  dialog: { showSaveDialog: vi.fn() },
}));

const ARCHIVE_HASH = 'a'.repeat(64);

function project(overrides: Record<string, unknown> = {}) {
  return {
    id: 'project-1',
    name: '机械臂入门',
    summary: '从零搭建桌面机械臂。',
    cover: {
      url: '/api/learning/projects/project-1/media/cover',
      alt: '机械臂封面',
      width: 1600,
      height: 900,
      internalKey: 'private/cover.webp',
    },
    tags: ['机器人', 'Python'],
    version: '1.2.0',
    archiveBytes: 1024,
    publishedAt: '2026-08-01T00:00:00Z',
    updatedAt: '2026-08-18T00:00:00Z',
    readmeMarkdown: '# 机械臂入门',
    archiveFileName: 'robot-arm.zip',
    archiveSha256: ARCHIVE_HASH,
    objectStorageKey: 'private/project.zip',
    ...overrides,
  };
}

function envelope(data: unknown): Response {
  return new Response(JSON.stringify({ success: true, data }), {
    status: 200,
    headers: { 'Content-Type': 'application/json' },
  });
}

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

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

  it.each([
    '/api/works/projects',
    '/api/works/learning/courses',
    '/api/works/learning/projects/project-1/unknown',
  ])('does not claim old or unrelated route %s', async (pathname) => {
    const handler = createLearningRouteHandler({ fetchImpl, getAccessToken });
    const response = createResponse();

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

  it('forwards bounded pagination and strictly projects project cards', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(envelope({
      items: [project()],
      nextCursor: 'next-page',
      total: 1,
      internalFacet: 'drop-me',
    }));
    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/projects?cursor=opaque&limit=24&unknown=no'),
      {} as never,
    );

    expect(fetchImpl).toHaveBeenCalledWith(
      'https://square.example/api/learning/projects?cursor=opaque&limit=24',
      expect.objectContaining({
        method: 'GET',
        headers: { Accept: 'application/json', Authorization: 'Bearer works-token' },
        redirect: 'manual',
      }),
    );
    expect(response.json).toEqual({
      success: true,
      data: {
        items: [{
          id: 'project-1',
          name: '机械臂入门',
          summary: '从零搭建桌面机械臂。',
          cover: {
            url: '/api/learning/projects/project-1/media/cover',
            alt: '机械臂封面',
            width: 1600,
            height: 900,
          },
          tags: ['机器人', 'Python'],
          version: '1.2.0',
          archiveBytes: 1024,
          publishedAt: '2026-08-01T00:00:00Z',
          updatedAt: '2026-08-18T00:00:00Z',
        }],
        nextCursor: 'next-page',
        total: 1,
      },
    });
    expect(JSON.stringify(response.json)).not.toContain('objectStorageKey');
  });

  it('projects detail Markdown and archive integrity metadata without storage keys', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(envelope(project()));
    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/projects/project-1'),
      {} as never,
    );

    expect(response.json).toMatchObject({
      success: true,
      data: {
        id: 'project-1',
        readmeMarkdown: '# 机械臂入门',
        archiveFileName: 'robot-arm.zip',
        archiveSha256: ARCHIVE_HASH,
      },
    });
    expect(JSON.stringify(response.json)).not.toContain('private/project.zip');
  });

  it('accepts project metadata above the former client archive-size limit', async () => {
    getAccessToken.mockResolvedValue('works-token');
    const archiveBytes = 512 * 1024 * 1024 + 1;
    fetchImpl.mockResolvedValue(envelope(project({ archiveBytes })));
    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/projects/project-1'),
      {} as never,
    );

    expect(response.json).toMatchObject({
      success: true,
      data: { id: 'project-1', archiveBytes },
    });
  });

  it('rejects malformed identities and unsafe media URLs in successful DTOs', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(envelope({
      items: [project({ cover: { url: 'http://internal.example/cover.png', alt: '不安全' } })],
      nextCursor: 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/projects'),
      {} as never,
    );

    expect(response.res.statusCode).toBe(502);
    expect(response.json).toMatchObject({ code: 'LEARNING_INVALID_RESPONSE' });
  });

  it('proxies only fixed raster media paths with Works authentication', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(new Response(Uint8Array.from([1, 2, 3]), {
      status: 200,
      headers: { 'Content-Type': 'image/webp', 'Content-Length': '3' },
    }));
    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/projects/project-1/media/readme-1'),
      {} as never,
    );

    expect(fetchImpl).toHaveBeenCalledWith(
      'https://square.example/api/learning/projects/project-1/media/readme-1',
      expect.objectContaining({ headers: expect.objectContaining({ Authorization: 'Bearer works-token' }) }),
    );
    expect(response.json).toEqual({ dataBase64: 'AQID', mimeType: 'image/webp' });
  });

  it('uses project metadata and a native destination before delegating verified download', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(envelope(project()));
    const chooseDestination = vi.fn().mockResolvedValue('D:\\Downloads\\robot-arm.zip');
    const saveArchive = vi.fn().mockResolvedValue(undefined);
    const binding = { accountKey: 'b'.repeat(64), epoch: 1 };
    const handler = createLearningRouteHandler({
      fetchImpl,
      getAccessToken,
      getAccountBinding: () => binding,
      isCurrentAccountBinding: () => true,
      chooseDestination,
      saveArchive,
      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/projects/project-1/download'),
      { mainWindow: null } as never,
    );

    expect(chooseDestination).toHaveBeenCalledWith(expect.anything(), 'robot-arm.zip');
    expect(saveArchive).toHaveBeenCalledWith(expect.objectContaining({
      destinationPath: 'D:\\Downloads\\robot-arm.zip',
      binding,
      project: expect.objectContaining({ id: 'project-1', archiveSha256: ARCHIVE_HASH }),
    }));
    expect(response.json).toEqual({ success: true, data: { status: 'saved' } });
  });

  it('does not download when the user cancels the native save dialog', async () => {
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(envelope(project()));
    const saveArchive = vi.fn();
    const handler = createLearningRouteHandler({
      fetchImpl,
      getAccessToken,
      getAccountBinding: () => ({ accountKey: 'b'.repeat(64), epoch: 1 }),
      isCurrentAccountBinding: () => true,
      chooseDestination: vi.fn().mockResolvedValue(null),
      saveArchive,
    });
    const response = createResponse();

    await handler(
      { method: 'POST' } as IncomingMessage,
      response.res,
      new URL('http://127.0.0.1/api/works/learning/projects/project-1/download'),
      {} as never,
    );

    expect(saveArchive).not.toHaveBeenCalled();
    expect(response.json).toEqual({ success: true, data: { status: 'cancelled' } });
  });

  it('refreshes one upstream 401 and redacts unavailable-service details', async () => {
    getAccessToken.mockResolvedValueOnce('expired').mockResolvedValueOnce('fresh');
    fetchImpl
      .mockResolvedValueOnce(new Response('expired secret', { status: 401 }))
      .mockResolvedValueOnce(envelope({ items: [], nextCursor: 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/projects'),
      {} as never,
    );

    expect(getAccessToken).toHaveBeenNthCalledWith(2, { fetchImpl, forceRefresh: true });
    expect(response.json).toEqual({ success: true, data: { items: [], nextCursor: null } });
  });
});