import { CohereStream, StreamingTextResponse, StreamData } from '.';
import { cohereChatChunks, cohereChunks } from '../tests/snapshots/cohere';
import { readAllChunks } from '../tests/utils/mock-client';
import { DEFAULT_TEST_URL, createMockServer } from '../tests/utils/mock-server';

const server = createMockServer([
  {
    url: 'https://api.cohere.ai/v1/chat',
    chunks: cohereChatChunks,
    formatChunk: chunk => `${JSON.stringify(chunk)}\n`,
  },
  {
    url: DEFAULT_TEST_URL,
    chunks: cohereChunks,
    formatChunk: chunk => `${JSON.stringify(chunk)}\n`,
  },
]);

describe('CohereStream', () => {
  beforeAll(() => {
    server.listen();
  });

  afterEach(() => {
    server.resetHandlers();
  });

  afterAll(() => {
    server.close();
  });

  it('should send text', async () => {
    const data = new StreamData();

    const stream = CohereStream(await fetch(DEFAULT_TEST_URL), {
      onFinal() {
        data.close();
      },
    });

    const response = new StreamingTextResponse(stream, {}, data);

    expect(await readAllChunks(response)).toEqual([
      '0:" Hello"\n',
      '0:","\n',
      '0:" world"\n',
      '0:"."\n',
      '0:" "\n',
    ]);
  });

  it('should send text and data', async () => {
    const data = new StreamData();

    data.append({ t1: 'v1' });

    const stream = CohereStream(await fetch(DEFAULT_TEST_URL), {
      onFinal() {
        data.close();
      },
    });

    const response = new StreamingTextResponse(stream, {}, data);

    expect(await readAllChunks(response)).toEqual([
      '2:[{"t1":"v1"}]\n',
      '0:" Hello"\n',
      '0:","\n',
      '0:" world"\n',
      '0:"."\n',
      '0:" "\n',
    ]);
  });
});