import fetchMock from 'fetch-mock';
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import {
  FETCH_NAMESPACESTRATEGIES_TYPES,
  FETCH_NAMESPACESTRATEGIES_TYPES_FAILURE,
  FETCH_NAMESPACESTRATEGIES_TYPES_PENDING,
  FETCH_NAMESPACESTRATEGIES_TYPES_SUCCESS,
  fetchNamespaceStrategiesIfNeeded,
  fetchNamespaceStrategiesSuccess,
  shouldFetchNamespaceStrategies,
  default as reducer,
  getNamespaceStrategies,
  isFetchNamespaceStrategiesPending,
  getFetchNamespaceStrategiesFailure,
} from './namespaceStrategies';
import { MODIFY_CONFIG_SUCCESS } from './config';

const strategies = {
  current: 'UsernameNamespaceStrategy',
  available: [
    'UsernameNamespaceStrategy',
    'CustomNamespaceStrategy',
    'CurrentYearNamespaceStrategy',
    'RepositoryTypeNamespaceStrategy',
  ],
  _links: {
    self: {
      href: 'http://localhost:8081/scm/api/v2/namespaceStrategies',
    },
  },
};

describe('namespace strategy caching', () => {
  it('should fetch strategies, on empty state', () => {
    expect(shouldFetchNamespaceStrategies({})).toBe(true);
  });

  it('should fetch strategies, on empty namespaceStrategies node', () => {
    const state = {
      namespaceStrategies: {},
    };
    expect(shouldFetchNamespaceStrategies(state)).toBe(true);
  });

  it('should not fetch strategies, on pending state', () => {
    const state = {
      pending: {
        [FETCH_NAMESPACESTRATEGIES_TYPES]: true,
      },
    };
    expect(shouldFetchNamespaceStrategies(state)).toBe(false);
  });

  it('should not fetch strategies, on failure state', () => {
    const state = {
      failure: {
        [FETCH_NAMESPACESTRATEGIES_TYPES]: new Error('no...'),
      },
    };
    expect(shouldFetchNamespaceStrategies(state)).toBe(false);
  });

  it('should not fetch strategies, if they are already fetched', () => {
    const state = {
      namespaceStrategies: {
        current: 'some',
      },
    };
    expect(shouldFetchNamespaceStrategies(state)).toBe(false);
  });
});

describe('namespace strategies fetch', () => {
  const URL = 'http://scm.hitchhiker.com/api/v2/namespaceStrategies';
  const mockStore = configureMockStore([thunk]);

  afterEach(() => {
    fetchMock.reset();
    fetchMock.restore();
  });

  const createStore = (initialState = {}) => {
    return mockStore({
      ...initialState,
      indexResources: {
        links: {
          namespaceStrategies: {
            href: URL,
          },
        },
      },
    });
  };

  it('should successfully fetch strategies', () => {
    fetchMock.getOnce(URL, strategies);

    const expectedActions = [
      {
        type: FETCH_NAMESPACESTRATEGIES_TYPES_PENDING,
      },
      {
        type: FETCH_NAMESPACESTRATEGIES_TYPES_SUCCESS,
        payload: strategies,
      },
    ];

    const store = createStore();
    return store.dispatch(fetchNamespaceStrategiesIfNeeded()).then(() => {
      expect(store.getActions()).toEqual(expectedActions);
    });
  });

  it('should dispatch FETCH_NAMESPACESTRATEGIES_TYPES_FAILURE on server error', () => {
    fetchMock.getOnce(URL, {
      status: 500,
    });

    const store = createStore();
    return store.dispatch(fetchNamespaceStrategiesIfNeeded()).then(() => {
      const actions = store.getActions();
      expect(actions[0].type).toBe(FETCH_NAMESPACESTRATEGIES_TYPES_PENDING);
      expect(actions[1].type).toBe(FETCH_NAMESPACESTRATEGIES_TYPES_FAILURE);
      expect(actions[1].payload).toBeDefined();
    });
  });

  it('should not dispatch any action, if the strategies are already fetched', () => {
    const store = createStore({
      namespaceStrategies: strategies,
    });
    store.dispatch(fetchNamespaceStrategiesIfNeeded());
    expect(store.getActions().length).toBe(0);
  });
});

describe('namespace strategies reducer', () => {
  it('should return unmodified state on unknown action', () => {
    const state = {};
    expect(reducer(state)).toBe(state);
  });

  it('should store the strategies on success', () => {
    const newState = reducer({}, fetchNamespaceStrategiesSuccess(strategies));
    expect(newState).toBe(strategies);
  });

  it('should clear store if config was modified', () => {
    const modifyConfigAction = {
      type: MODIFY_CONFIG_SUCCESS,
      payload: {
        namespaceStrategy: 'CustomNamespaceStrategy',
      },
    };
    const newState = reducer(strategies, modifyConfigAction);
    expect(newState.current).toEqual('CustomNamespaceStrategy');
  });
});

describe('namespace strategy selectors', () => {
  const error = new Error('The end of the universe');

  it('should return an empty object', () => {
    expect(getNamespaceStrategies({})).toEqual({});
  });

  it('should return the namespace strategies', () => {
    const state = {
      namespaceStrategies: strategies,
    };
    expect(getNamespaceStrategies(state)).toBe(strategies);
  });

  it('should return true, when fetch namespace strategies is pending', () => {
    const state = {
      pending: {
        [FETCH_NAMESPACESTRATEGIES_TYPES]: true,
      },
    };
    expect(isFetchNamespaceStrategiesPending(state)).toEqual(true);
  });

  it('should return false, when fetch strategies is not pending', () => {
    expect(isFetchNamespaceStrategiesPending({})).toEqual(false);
  });

  it('should return error when fetch namespace strategies did fail', () => {
    const state = {
      failure: {
        [FETCH_NAMESPACESTRATEGIES_TYPES]: error,
      },
    };
    expect(getFetchNamespaceStrategiesFailure(state)).toEqual(error);
  });

  it('should return undefined when fetch strategies did not fail', () => {
    expect(getFetchNamespaceStrategiesFailure({})).toBe(undefined);
  });
});