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

const mocks = vi.hoisted(() => ({
  resolveModel: vi.fn(),
  isProviderKeyRequired: vi.fn(),
  generateSceneOutlinesFromRequirements: vi.fn(),
  applyOutlineFallbacks: vi.fn(),
  generateSceneContent: vi.fn(),
  generateSceneActions: vi.fn(),
  createSceneWithActions: vi.fn(),
  persistClassroom: vi.fn(),
  callLLM: vi.fn(),
}));

vi.mock('@/lib/server/resolve-model', () => ({
  resolveModel: mocks.resolveModel,
}));

vi.mock('@/lib/ai/providers', () => ({
  isProviderKeyRequired: mocks.isProviderKeyRequired,
}));

vi.mock('@/lib/ai/llm', () => ({
  callLLM: mocks.callLLM,
}));

vi.mock('@/lib/generation/outline-generator', () => ({
  generateSceneOutlinesFromRequirements: mocks.generateSceneOutlinesFromRequirements,
  applyOutlineFallbacks: mocks.applyOutlineFallbacks,
}));

vi.mock('@/lib/generation/scene-generator', () => ({
  generateSceneContent: mocks.generateSceneContent,
  generateSceneActions: mocks.generateSceneActions,
  createSceneWithActions: mocks.createSceneWithActions,
}));

vi.mock('@/lib/server/classroom-storage', () => ({
  persistClassroom: mocks.persistClassroom,
}));

vi.mock('@/lib/logger', () => ({
  createLogger: () => ({
    info: vi.fn(),
    warn: vi.fn(),
    error: vi.fn(),
    debug: vi.fn(),
  }),
}));

const outline = {
  id: 'outline-1',
  type: 'slide',
  title: 'Retry Basics',
  description: 'Explain retries',
  keyPoints: ['Retry transient failures'],
  order: 1,
} as const;

const slideContent = {
  elements: [],
  remark: 'Retry transient failures',
};

async function generateWithProgress() {
  const progress: Array<{ message: string }> = [];
  const { generateClassroom } = await import('@/lib/server/classroom-generation');
  const result = await generateClassroom(
    { requirement: 'Teach retry basics' },
    {
      baseUrl: 'http://localhost',
      onProgress: (event) => {
        progress.push({ message: event.message });
      },
    },
  );
  return { result, progress };
}

describe('classroom scene generation retries', () => {
  beforeEach(() => {
    for (const mock of Object.values(mocks)) {
      mock.mockReset();
    }
    mocks.resolveModel.mockResolvedValue({
      model: { id: 'language-model' },
      modelInfo: {},
      modelString: 'test:model',
      providerId: 'test',
      apiKey: '',
    });
    mocks.isProviderKeyRequired.mockReturnValue(false);
    mocks.callLLM.mockResolvedValue({ text: 'ok' });
    mocks.generateSceneOutlinesFromRequirements.mockResolvedValue({
      success: true,
      data: {
        languageDirective: 'Use English.',
        outlines: [outline],
      },
    });
    mocks.applyOutlineFallbacks.mockImplementation((value) => value);
    mocks.generateSceneActions.mockResolvedValue([]);
    mocks.createSceneWithActions.mockImplementation((sceneOutline, content, actions, api) => {
      const sceneResult = api.scene.create({
        type: sceneOutline.type,
        title: sceneOutline.title,
        order: sceneOutline.order,
        content: {
          type: 'slide',
          canvas: {
            id: 'slide-1',
            viewportSize: 1000,
            viewportRatio: 0.5625,
            elements: content.elements,
          },
        },
        actions,
      });
      return sceneResult.success ? (sceneResult.data ?? null) : null;
    });
    mocks.persistClassroom.mockImplementation(async ({ id, scenes }) => ({
      id,
      url: `http://localhost/classroom/${id}`,
      scenesCount: scenes.length,
      createdAt: '2026-06-22T00:00:00.000Z',
    }));
  });

  it('retries an empty scene content result before skipping the scene', async () => {
    mocks.generateSceneContent.mockResolvedValueOnce(null).mockResolvedValueOnce(slideContent);

    const { result, progress } = await generateWithProgress();

    expect(result.scenesCount).toBe(1);
    expect(mocks.generateSceneContent).toHaveBeenCalledTimes(2);
    expect(progress.some((event) => event.message.includes('Retrying scene 1/1 content'))).toBe(
      true,
    );
  });

  it('forwards classroom thinking config to scene retry LLM calls', async () => {
    const thinkingConfig = { enabled: true, effort: 'high' };
    mocks.resolveModel.mockResolvedValue({
      model: { id: 'language-model' },
      modelInfo: {},
      modelString: 'test:model',
      providerId: 'test',
      apiKey: '',
      thinkingConfig,
    });
    mocks.generateSceneContent.mockImplementation(async (_outline, aiCall) => {
      await aiCall('system', 'user');
      return slideContent;
    });

    await generateWithProgress();

    expect(mocks.callLLM).toHaveBeenCalledWith(
      expect.objectContaining({ maxRetries: 0 }),
      'generate-classroom-scene',
      undefined,
      thinkingConfig,
    );
  });

  it('retries retryable action generation errors', async () => {
    mocks.generateSceneContent.mockResolvedValue(slideContent);
    mocks.generateSceneActions
      .mockRejectedValueOnce(Object.assign(new Error('rate limited'), { statusCode: 429 }))
      .mockResolvedValueOnce([]);

    const { result, progress } = await generateWithProgress();

    expect(result.scenesCount).toBe(1);
    expect(mocks.generateSceneActions).toHaveBeenCalledTimes(2);
    expect(progress.some((event) => event.message.includes('Retrying scene 1/1 actions'))).toBe(
      true,
    );
  });

  it('does not retry non-retryable action generation errors', async () => {
    const unauthorized = Object.assign(new Error('Unauthorized'), { statusCode: 401 });
    mocks.generateSceneContent.mockResolvedValue(slideContent);
    mocks.generateSceneActions.mockRejectedValue(unauthorized);

    await expect(generateWithProgress()).rejects.toBe(unauthorized);

    expect(mocks.generateSceneActions).toHaveBeenCalledTimes(1);
  });
});