// @vitest-environment node
import { beforeEach, describe, expect, it, vi } from 'vitest';
import { createLearningRuntimeBridge } from '@electron/services/learning-runtime-bridge';
import type {
  LearningRuntimeBridgeEvent,
  LearningRuntimeBridgeRequest,
} from '../../shared/learning';

describe('Learning runtime bridge', () => {
  const fetchImpl = vi.fn<typeof fetch>();
  const getAccessToken = vi.fn();

  beforeEach(() => {
    fetchImpl.mockReset();
    getAccessToken.mockReset();
    getAccessToken.mockResolvedValue('works-token');
    fetchImpl.mockResolvedValue(new Response(JSON.stringify({ score: 1 }), {
      status: 200,
      headers: { 'Content-Type': 'application/json' },
    }));
  });

  it('pins aggregate identity in the path/header and forwards only the module and scene anchor', async () => {
    const bridge = createLearningRuntimeBridge({
      fetchImpl,
      getAccessToken,
      apiBaseUrl: 'https://square.example',
    });
    const events: LearningRuntimeBridgeEvent[] = [];
    const request = {
      requestId: 'runtime-1',
      courseId: 'course-1',
      contentHash: 'a'.repeat(64),
      capability: 'pbl/v2/evaluate',
      method: 'POST',
      context: {
        moduleId: 'module-1',
        moduleContentHash: 'b'.repeat(64),
        anchor: {
          sceneId: 'scene-2',
          sceneOrder: 2,
          courseId: 'iframe-course',
          contentHash: 'c'.repeat(64),
          moduleId: 'iframe-module',
          actionIndex: 9,
        },
      },
      body: { answer: 'B' },
    } as unknown as LearningRuntimeBridgeRequest;

    await bridge.request(request, (event) => events.push(event));

    expect(fetchImpl).toHaveBeenCalledWith(
      'https://square.example/api/learning/courses/course-1/runtime/pbl/v2/evaluate',
      expect.objectContaining({
        method: 'POST',
        headers: expect.objectContaining({
          Authorization: 'Bearer works-token',
          'X-Course-Content-Hash': 'a'.repeat(64),
          'X-Content-Hash': 'a'.repeat(64),
        }),
      }),
    );
    const init = fetchImpl.mock.calls[0][1]!;
    expect(JSON.parse(String(init.body))).toEqual({
      context: {
        moduleId: 'module-1',
        moduleContentHash: 'b'.repeat(64),
        anchor: { sceneId: 'scene-2', sceneOrder: 2 },
      },
      body: { answer: 'B' },
    });
    expect(events[0]).toMatchObject({ type: 'start', status: 200, contentType: 'application/json' });
    expect(events.at(-1)).toEqual({ requestId: 'runtime-1', type: 'end' });
    const responseText = events
      .filter((event): event is Extract<LearningRuntimeBridgeEvent, { type: 'chunk' }> => event.type === 'chunk')
      .map((event) => new TextDecoder().decode(event.chunk))
      .join('');
    expect(JSON.parse(responseText)).toEqual({ score: 1 });
  });

  it('redacts upstream and local failures and refreshes authentication at most once', async () => {
    fetchImpl
      .mockResolvedValueOnce(new Response(JSON.stringify({ detail: 'expired token secret' }), { status: 401 }))
      .mockResolvedValueOnce(new Response(JSON.stringify({ detail: 'database traceback' }), { status: 500 }));
    getAccessToken.mockResolvedValueOnce('old-token').mockResolvedValueOnce('new-token');
    const bridge = createLearningRuntimeBridge({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const events: LearningRuntimeBridgeEvent[] = [];
    await bridge.request({
      requestId: 'runtime-1',
      courseId: 'course-1',
      contentHash: 'a'.repeat(64),
      capability: 'quiz-grade',
      method: 'POST',
      context: { moduleId: null, moduleContentHash: 'a'.repeat(64), anchor: { sceneId: 'scene-1' } },
      body: {},
    }, (event) => events.push(event));

    expect(fetchImpl).toHaveBeenCalledTimes(2);
    expect(getAccessToken).toHaveBeenCalledTimes(2);
    expect(events).toEqual([{
      requestId: 'runtime-1',
      type: 'error',
      code: 'LEARNING_RUNTIME_UNAVAILABLE',
      message: '课堂联网能力暂时不可用',
    }]);
  });

  it('bounds untrusted response content type and hides local exception text', async () => {
    fetchImpl
      .mockResolvedValueOnce(new Response('ok', { status: 200, headers: { 'Content-Type': `text/plain; secret=${'x'.repeat(300)}` } }))
      .mockRejectedValueOnce(new Error('connect ECONNREFUSED 127.0.0.1:9999'));
    const bridge = createLearningRuntimeBridge({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const first: LearningRuntimeBridgeEvent[] = [];
    const request: LearningRuntimeBridgeRequest = {
      requestId: 'runtime-1', courseId: 'course-1', contentHash: 'a'.repeat(64), capability: 'quiz-grade', method: 'POST',
      context: { moduleId: null, moduleContentHash: 'a'.repeat(64), anchor: { sceneId: 'scene-1' } }, body: {},
    };
    await bridge.request(request, (event) => first.push(event));
    expect(first[0]).toMatchObject({ type: 'start', status: 200, contentType: 'text/plain' });
    const second: LearningRuntimeBridgeEvent[] = [];
    await bridge.request({ ...request, requestId: 'runtime-2' }, (event) => second.push(event));
    expect(second).toEqual([{
      requestId: 'runtime-2', type: 'error', code: 'LEARNING_RUNTIME_UNAVAILABLE', message: '课堂联网能力暂时不可用',
    }]);
  });

  it('does not send a runtime request after its captured account changes during token lookup', async () => {
    let resolveToken!: (token: string) => void;
    getAccessToken.mockReturnValueOnce(new Promise((resolve) => { resolveToken = resolve; }));
    let current = true;
    const bridge = createLearningRuntimeBridge({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const events: LearningRuntimeBridgeEvent[] = [];
    const result = bridge.request({
      requestId: 'runtime-account-switch', courseId: 'course-1', contentHash: 'a'.repeat(64), capability: 'quiz-grade', method: 'POST',
      context: { moduleId: null, moduleContentHash: 'a'.repeat(64), anchor: { sceneId: 'scene-1' } }, body: {},
    }, (event) => events.push(event), () => { if (!current) throw new Error('account changed'); });
    current = false;
    resolveToken('new-account-token');
    await result;
    expect(fetchImpl).not.toHaveBeenCalled();
    expect(events).toEqual([{
      requestId: 'runtime-account-switch', type: 'error', code: 'LEARNING_RUNTIME_UNAVAILABLE', message: '课堂联网能力暂时不可用',
    }]);
  });

  it('does not retry a 401 after its captured account changes during refresh', async () => {
    let resolveRefresh!: (token: string) => void;
    getAccessToken.mockResolvedValueOnce('old-token').mockReturnValueOnce(new Promise((resolve) => { resolveRefresh = resolve; }));
    fetchImpl.mockResolvedValueOnce(new Response(null, { status: 401 }));
    let current = true;
    const bridge = createLearningRuntimeBridge({ fetchImpl, getAccessToken, apiBaseUrl: 'https://square.example' });
    const result = bridge.request({
      requestId: 'runtime-refresh-switch', courseId: 'course-1', contentHash: 'a'.repeat(64), capability: 'quiz-grade', method: 'POST',
      context: { moduleId: null, moduleContentHash: 'a'.repeat(64), anchor: { sceneId: 'scene-1' } }, body: {},
    }, () => undefined, () => { if (!current) throw new Error('account changed'); });
    await vi.waitFor(() => expect(getAccessToken).toHaveBeenCalledTimes(2));
    current = false;
    resolveRefresh('new-account-token');
    await result;
    expect(fetchImpl).toHaveBeenCalledOnce();
  });
});