import {
  describe, it, expect, vi, Mock, beforeAll, afterEach,
} from 'vitest';
import { EventEmitter } from 'events';
import { createVideoClipper, VideoClipEventEmitter } from '@modal/webvideo-clip-core';
import SERVER from '../src/server';
import '../src/routes';
import { constants } from 'http2';

class MockEventEmitter extends EventEmitter {
  process = vi.fn();
}

vi.mock('@modal/webvideo-clip-core');

describe('ClipController.clip: POST /clip', () => {
  let mockEventEmitter: VideoClipEventEmitter;
  beforeAll(() => {
    mockEventEmitter = new MockEventEmitter();
    (createVideoClipper as Mock).mockReturnValue(mockEventEmitter);
  });

  afterEach(() => {
    (mockEventEmitter.process as Mock).mockReset();
  });

  it('returns the clip', async () => {
    const dummyOutput = 'string content';
    (mockEventEmitter.process as Mock).mockImplementationOnce(
      function mockProcess(this: VideoClipEventEmitter) {
        this.emit('success', {
          type: 'video/webm',
          output: Buffer.from(dummyOutput),
        });
        this.emit('end');
      },
    );

    const response = await SERVER
      .inject()
      .post('/clip')
      .body({
        url: 'https://www.youtube.com/watch?v=BaW_jenozKc',
        start: '00:00:00',
        end: '00:00:05',
      });

    expect(response.statusCode).toBe(constants.HTTP_STATUS_OK);
    expect(response.headers['content-type']).toBe('video/webm');
    expect(response.headers['content-length']).toBe(dummyOutput.length.toString());
  });

  it('returns an error when the clip function throws', async () => {
    (mockEventEmitter.process as Mock).mockImplementationOnce(
      function mockProcess(this: VideoClipEventEmitter) {
        this.emit('error', new Error());
        this.emit('end');
      },
    );

    const response = await SERVER
      .inject()
      .post('/clip')
      .body({
        url: 'https://www.youtube.com/watch?v=BaW_jenozKc',
        start: '00:00:00',
        end: '00:00:05',
      });

    expect(response.statusCode).toBe(constants.HTTP_STATUS_INTERNAL_SERVER_ERROR);
  });

  it('returns an error when the URL could not be found', async () => {
    const response = await SERVER
      .inject()
      .post('/clip')
      .body({});

    expect(response.statusCode).toBe(constants.HTTP_STATUS_BAD_REQUEST);
  });

  it('returns an error when the URL is unsupported', async () => {
    const response = await SERVER
      .inject()
      .post('/clip')
      .body({
        url: 'https://unsupported.com',
      });

    expect(response.statusCode).toBe(constants.HTTP_STATUS_UNPROCESSABLE_ENTITY);
  });
});