import reducer, { isPending } from './pending';

describe('pending reducer', () => {
  it('should set pending for FETCH_ITEMS to true', () => {
    const newState = reducer(
      {},
      {
        type: 'FETCH_ITEMS_PENDING',
      },
    );
    expect(newState['FETCH_ITEMS']).toBe(true);
  });

  it('should do nothing for unknown action types', () => {
    const state = {};
    const newState = reducer(state, {
      type: 'UNKNOWN',
    });
    expect(newState).toBe(state);
  });

  it('should set pending for FETCH_ITEMS to true, but should not affect others', () => {
    const newState = reducer(
      {
        FETCH_USERS: true,
      },
      {
        type: 'FETCH_ITEMS_PENDING',
      },
    );
    expect(newState['FETCH_ITEMS']).toBe(true);
    expect(newState['FETCH_USERS']).toBe(true);
  });

  it('should reset pending state for FETCH_ITEMS after FETCH_ITEMS_SUCCESS', () => {
    const newState = reducer(
      {
        FETCH_ITEMS: true,
      },
      {
        type: 'FETCH_ITEMS_SUCCESS',
      },
    );
    expect(newState['FETCH_ITEMS']).toBeFalsy();
  });

  it('should reset pending state for FETCH_ITEMS after FETCH_ITEMS_FAILURE', () => {
    const newState = reducer(
      {
        FETCH_ITEMS: true,
      },
      {
        type: 'FETCH_ITEMS_FAILURE',
      },
    );
    expect(newState['FETCH_ITEMS']).toBeFalsy();
  });

  it('should reset pending state for FETCH_ITEMS after FETCH_ITEMS_RESET', () => {
    const newState = reducer(
      {
        FETCH_ITEMS: true,
      },
      {
        type: 'FETCH_ITEMS_RESET',
      },
    );
    expect(newState['FETCH_ITEMS']).toBeFalsy();
  });

  it('should reset pending state for FETCH_ITEMS, if resetPending prop is available', () => {
    const newState = reducer(
      {
        FETCH_ITEMS: true,
      },
      {
        type: 'FETCH_ITEMS_SOMETHING',
        resetPending: true,
      },
    );
    expect(newState['FETCH_ITEMS']).toBeFalsy();
  });

  it('should reset pending state for FETCH_ITEMS after FETCH_ITEMS_SUCCESS, but should not affect others', () => {
    const newState = reducer(
      {
        FETCH_USERS: true,
        FETCH_ITEMS: true,
      },
      {
        type: 'FETCH_ITEMS_SUCCESS',
      },
    );
    expect(newState['FETCH_ITEMS']).toBeFalsy();
    expect(newState['FETCH_USERS']).toBe(true);
  });

  it('should set pending for a single item', () => {
    const newState = reducer(
      {
        'FETCH_USER/42': false,
      },
      {
        type: 'FETCH_USER_PENDING',
        itemId: 21,
      },
    );
    expect(newState['FETCH_USER/21']).toBe(true);
    expect(newState['FETCH_USER/42']).toBe(false);
  });

  it('should reset pending for a single item', () => {
    const newState = reducer(
      {
        'FETCH_USER/42': true,
      },
      {
        type: 'FETCH_USER_SUCCESS',
        itemId: 42,
      },
    );
    expect(newState['FETCH_USER/42']).toBeFalsy();
  });
});

describe('pending selectors', () => {
  it('should return true, while FETCH_ITEMS is pending', () => {
    const result = isPending(
      {
        pending: {
          FETCH_ITEMS: true,
        },
      },
      'FETCH_ITEMS',
    );
    expect(result).toBe(true);
  });

  it('should return false, if pending is not defined', () => {
    const result = isPending({}, 'FETCH_ITEMS');
    expect(result).toBe(false);
  });

  it('should return true, while FETCH_ITEM 42 is pending', () => {
    const result = isPending(
      {
        pending: {
          'FETCH_ITEM/42': true,
        },
      },
      'FETCH_ITEM',
      42,
    );
    expect(result).toBe(true);
  });

  it('should return true, while FETCH_ITEM 42 is undefined', () => {
    const result = isPending(
      {
        pending: {
          'FETCH_ITEM/21': true,
        },
      },
      'FETCH_ITEM',
      42,
    );
    expect(result).toBe(false);
  });
});