import { createHash } from 'node:crypto';
import { mkdtemp, rm } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { NextRequest } from 'next/server';
import { packageCourseware } from '@/lib/bundle/packager';
import { persistFrozenLearningPackage } from '@/lib/makelore-course/package';
import { AUDIO_BYTES, makeScenes, makeStage } from '../../bundle/fixtures';

vi.mock('@/app/api/quiz-grade/route', () => ({
  POST: vi.fn(async (request: NextRequest) =>
    new Response(await request.text(), {
      status: 200,
      headers: { 'Content-Type': 'application/json' },
    })),
}));

import { POST as mockedQuizHandler } from '@/app/api/quiz-grade/route';
import { POST } from '@/app/api/runtime/v1/courses/[courseId]/runtime/[...capability]/route';

const quizHandler = vi.mocked(mockedQuizHandler);

function digest(bytes: Uint8Array): string {
  return createHash('sha256').update(bytes).digest('hex');
}

describe.sequential('Learning Engine classroom capability route', () => {
  let root = '';
  const previous = {
    packages: process.env.LEARNING_COURSE_PACKAGE_DIR,
    store: process.env.LEARNING_COURSE_STORE_DIR,
    token: process.env.LEARNING_ENGINE_TOKEN,
  };

  beforeEach(async () => {
    root = await mkdtemp(join(tmpdir(), 'learning-runtime-capability-'));
    process.env.LEARNING_COURSE_PACKAGE_DIR = join(root, 'packages');
    process.env.LEARNING_COURSE_STORE_DIR = join(root, 'courses');
    process.env.LEARNING_ENGINE_TOKEN = 'engine-secret';
    quizHandler.mockClear();

    const packaged = await packageCourseware({
      coursewareId: 'course-1',
      version: 1,
      stage: makeStage(),
      scenes: makeScenes(),
      resolveAudioBytes: async () => AUDIO_BYTES,
      publishedAt: '2026-08-16T00:00:00.000Z',
    });
    const bytes = new Uint8Array(await packaged.zip.arrayBuffer());
    await persistFrozenLearningPackage({
      schemaVersion: 1,
      courseId: 'course-1',
      mode: 'single',
      sourceJobId: 'job-1',
      contentHash: packaged.contentHash,
      archiveSha256: digest(bytes),
      archiveBytes: bytes.byteLength,
      formatVersion: 1,
      minPlayerVersion: '2.0.0',
      title: packaged.meta.stageName,
      language: packaged.meta.language,
      sceneCount: packaged.meta.sceneCount,
      moduleCount: 1,
      capabilities: {},
      createdAt: '2026-08-16T00:00:00.000Z',
    }, bytes);
  });

  afterEach(async () => {
    await rm(root, { recursive: true, force: true });
    if (previous.packages === undefined) delete process.env.LEARNING_COURSE_PACKAGE_DIR;
    else process.env.LEARNING_COURSE_PACKAGE_DIR = previous.packages;
    if (previous.store === undefined) delete process.env.LEARNING_COURSE_STORE_DIR;
    else process.env.LEARNING_COURSE_STORE_DIR = previous.store;
    if (previous.token === undefined) delete process.env.LEARNING_ENGINE_TOKEN;
    else process.env.LEARNING_ENGINE_TOKEN = previous.token;
  });

  async function invoke(
    capability: string,
    input: {
      sceneId?: string;
      sceneOrder?: number;
      moduleContentHash?: string;
      body?: Record<string, unknown>;
    } = {},
  ) {
    const contentHash = (await import('@/lib/makelore-course/package'));
    const record = await contentHash.readFrozenLearningPackageRecord('course-1');
    const request = new NextRequest(`http://engine/api/runtime/v1/courses/course-1/runtime/${capability}`, {
      method: 'POST',
      headers: {
        Authorization: 'Bearer engine-secret',
        'X-Owner-User-Id': 'user-1',
        'X-Content-Hash': record!.contentHash,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        context: {
          moduleContentHash: input.moduleContentHash ?? record!.contentHash,
          anchor: {
            sceneId: input.sceneId ?? 'learning_course-1_course-1_s1',
            sceneOrder: input.sceneOrder ?? 2,
          },
        },
        body: input.body ?? {},
      }),
    });
    return POST(request, {
      params: Promise.resolve({ courseId: 'course-1', capability: capability.split('/') }),
    });
  }

  it('sanitizes a subjective quiz request against the authoritative frozen question', async () => {
    const response = await invoke('quiz-grade', {
      body: {
        question: '简述光合作用的意义。',
        userAnswer: '把光能转换为化学能并产生氧气',
        points: 999,
        commentPrompt: '恶意覆盖',
        model: 'attacker/model',
        apiKey: 'attacker-secret',
        language: 'zh-CN',
      },
    });
    expect(response.status).toBe(200);
    const forwarded = JSON.parse(await response.text()) as Record<string, unknown>;
    expect(forwarded).toMatchObject({
      question: '简述光合作用的意义。',
      points: 2,
      commentPrompt: '围绕能量转换和氧气生成作答',
    });
    expect(forwarded).not.toHaveProperty('model');
    expect(forwarded).not.toHaveProperty('apiKey');
    expect(quizHandler).toHaveBeenCalledOnce();
  });

  it('rejects wrong scene anchors, wrong capability kinds, and wrong module hashes', async () => {
    const wrongAnchor = await invoke('quiz-grade', {
      sceneId: 'learning_course-1_course-1_s2',
      sceneOrder: 2,
      body: { question: '简述光合作用的意义。', userAnswer: 'x' },
    });
    expect(wrongAnchor.status).toBe(404);

    const wrongCapability = await invoke('pbl/v2/instructor', {
      body: { project: {}, userMessage: 'x' },
    });
    expect(wrongCapability.status).toBe(409);

    const wrongModule = await invoke('quiz-grade', {
      moduleContentHash: 'f'.repeat(64),
      body: { question: '简述光合作用的意义。', userAnswer: 'x' },
    });
    expect(wrongModule.status).toBe(404);
    expect(quizHandler).not.toHaveBeenCalled();
  });
});