import {RequestParameters, GraphQLResponse} from 'relay-runtime';
import fetchMock from 'fetch-mock';

// FIXME: imports in this manner work fine via `yarn test` but fails in-editor
// for code completion, but this is likely a local misconfiguration
import environment, {cache, fetchQuery} from 'packs/frontend/graphqlEnvironment';
//import environment, {cache, fetchQuery} from '../../../app/javascript/packs/frontend/graphqlEnvironment';

describe('fetchQuery', () => {
  const defaultRequestParameters: RequestParameters = {
    name: 'test query',
    operationKind: 'query',
    metadata: {foo: 'bar'},
    id: null,
    text: 'dummy text',
  };

  afterEach(fetchMock.reset);

  it('builds the correct request', done => {
    fetchMock.mock('/api/graphql', {great: 'success', errors: []});
    const res = fetchQuery(defaultRequestParameters, {bar: 'baz'}, null);
    const opts = fetchMock.lastOptions();

    expect(opts.method).toEqual('POST');
    expect(opts.headers['Content-Type']).toEqual('application/json');
    expect(opts['body']).toEqual(JSON.stringify({query: 'dummy text', variables: {bar: 'baz'}}));

    (res as Promise<GraphQLResponse>).finally(() => {
      cache.clear();
      done();
    });
  });

  it('responds with json', done => {
    fetchMock.mock('/api/graphql', {great: 'success', errors: []});
    const res = fetchQuery(defaultRequestParameters, {bar: 'baz'}, null);

    (res as Promise<GraphQLResponse>)
      .then(data => expect(data).toEqual({great: 'success', errors: []}))
      .finally(() => {
        cache.clear();
        done();
      });
  });

  it('caches responses', done => {
    const variables = {bar: 'baz'};
    const expectedResponse = {great: 'success', errors: []};
    cache.set(defaultRequestParameters.name, variables, expectedResponse);

    fetchMock.postOnce('/api/graphql', {great: 'success 1', errors: []});
    const res = fetchQuery(defaultRequestParameters, variables, null);

    expect(fetchMock.calls().length).toEqual(0);
    (res as Promise<GraphQLResponse>)
      .then(data => {
        expect(data.extensions).not.toBeNull();
        expect(data.extensions.cacheTimestamp).not.toBeNull();
        // Remove cache data from response info after we've verified it exists
        delete data.extensions;

        expect(data).toEqual(expectedResponse);
      })
      .finally(() => {
        cache.clear();
        done();
      });
  });

  it('bypasses cache when force param given', done => {
    const variables = {bar: 'baz'};
    const cachedResponse = {great: 'success', errors: []};
    cache.set(defaultRequestParameters.name, variables, cachedResponse);

    fetchMock.postOnce('/api/graphql', {great: 'success 1', errors: []});
    const res = fetchQuery(defaultRequestParameters, variables, {force: true});

    expect(fetchMock.calls().length).toEqual(1);
    (res as Promise<GraphQLResponse>)
      .then(data => expect(data).toEqual({great: 'success 1', errors: []}))
      .finally(() => {
        cache.clear();
        done();
      });
  });
});