import {createLocalVue, mount} from '@vue/test-utils';
import { createMockClient } from 'mock-apollo-client';

import SIDEBAR from '@/graphql/gql/local/sidebar.gql';
import ME_QUERY from '@/graphql/gql/queries/meQuery.gql';
import UPDATE_USER_SETTING from '@/graphql/gql/mutations/updateUserSetting.gql';
import MY_SCHOOL_CLASS_QUERY from '@/graphql/gql/queries/mySchoolClass.gql';
import DELETE_MODULE_NODES from '@/graphql/gql/local/mutations/deleteModuleNodes.gql';
import MODULE_DETAILS_QUERY from '@/graphql/gql/queries/modules/moduleDetailsQuery.gql';

import VueApollo from 'vue-apollo';
import ClassSelectionWidget from '@/components/school-class/ClassSelectionWidget';



// https://dev.to/n_tepluhina/testing-vue-apollo-2020-edition-2l2p

const localVue = createLocalVue();
localVue.use(VueApollo);

const updateSettingsResponse = {
  data: {
    updateSetting: {
      success: true,
      errors:null,
      __typename: 'UpdateSettingPayload'
    }
  }
};

const querySidebarResponse = {
  data: {}
};

const deleteModulesResponse = {
  data: {}
};

const meQueryResponse = {
  data: {
    me: {
      __typename: "PrivateUserNode",
      id: "UHJpdmF0ZVVzZXJOb2RlOjI=",
      pk: 2,
      username: "ross.geller",
      email: "ross.geller@skillbox.example",
      firstName: "Ross",
      lastName: "Geller",
      avatarUrl: "https://ucarecdn.com/fe10f9cc-a509-4170-9396-258abc418247/",
      expiryDate: "2021-11-29",
      readOnly: false,
      lastModule: null,
      lastTopic: {
        id: "VG9waWNOb2RlOjQ5",
        slug: "berufliche-grundbildung",
        __typename: "TopicNode"
      },
      selectedClass: {
        id: "U2Nob29sQ2xhc3NOb2RlOjM=",
        readOnly: false,
        __typename: "SchoolClassNode"
      },
      recentModules: {
        edges: [],
        __typename: "ModuleNodeConnection"
      },
      schoolClasses: {
        edges: [
          {
            node: {
              id: "U2Nob29sQ2xhc3NOb2RlOjE=",
              name: "Friends",
              __typename: "SchoolClassNode"
            },
            __typename: "SchoolClassNodeEdge"
          },
          {
            node: {
              id: "U2Nob29sQ2xhc3NOb2RlOjM=",
              name: "ghfgfh",
              __typename: "SchoolClassNode"
            },
            __typename: "SchoolClassNodeEdge"
          }
        ],
        __typename: "SchoolClassNodeConnection"
      },
      team: null,
      isTeacher: true,
      permissions: [
        "users.can_manage_school_class_content"
      ],
      onboardingVisited: true
    }
  }
};

const mySchoolClassResponse = {
  data: {}
};

const moduleDetailResponse = {
  data: {}
};

const slug = '/some/123';
const schoolClasses = [
  {
    id: 'abcd123',
    name: 'Hello'
  },{
    id: 'xyz098',
    name: 'Kitty'
  }
];

describe('ClassSelectionWidget.vue', () => {

  let mockClient;
  let apolloProvider;
  let wrapper;

  const requestHandlers = {
    updateSettingsHandler: jest.fn().mockResolvedValueOnce(updateSettingsResponse),
    querySidebarHandler: jest.fn().mockResolvedValueOnce(querySidebarResponse),
    meQueryHandler: jest.fn().mockResolvedValueOnce(meQueryResponse),
    deleteModulesHandler: jest.fn().mockResolvedValueOnce(deleteModulesResponse),
    mySchoolClassHandler: jest.fn().mockResolvedValueOnce(mySchoolClassResponse),
    moduleDetailHandler: jest.fn().mockResolvedValueOnce(moduleDetailResponse),
  };


  const createComponent = () => {
    mockClient =  createMockClient();
    mockClient.cache.writeQuery = jest.fn();

    mockClient.setRequestHandler(UPDATE_USER_SETTING, requestHandlers.updateSettingsHandler);
    mockClient.setRequestHandler(SIDEBAR, requestHandlers.querySidebarHandler);
    mockClient.setRequestHandler(ME_QUERY, requestHandlers.meQueryHandler);
    mockClient.setRequestHandler(DELETE_MODULE_NODES, requestHandlers.deleteModulesHandler);
    mockClient.setRequestHandler(MY_SCHOOL_CLASS_QUERY, requestHandlers.mySchoolClassHandler);
    mockClient.setRequestHandler(MODULE_DETAILS_QUERY, requestHandlers.moduleDetailHandler);

    apolloProvider = new VueApollo({
      defaultClient: mockClient,
    });

    wrapper = mount(ClassSelectionWidget, {
      localVue,
      apolloProvider,
      mocks: {
        $route: {
          params: {
            slug
          }
        }
      }
    });

    wrapper.vm.me.schoolClass = schoolClasses;

  };


  it('should delete the modules cache and query the current module on a class change', async () => {

    createComponent();

    wrapper.vm.me.selectedClass = {id: 'abcd123'};
    wrapper.vm.updateSelectedClassAndHidePopover(schoolClasses[1]);

    expect(requestHandlers.updateSettingsHandler).toHaveBeenCalledWith({
      input: {
        id: schoolClasses[1].id
      }
    });

    await wrapper.vm.$nextTick();

    // modules have been removed from cache
    expect(requestHandlers.deleteModulesHandler).toHaveBeenCalled();
    expect(requestHandlers.mySchoolClassHandler).toHaveBeenCalled();
    // current module is being refetched
    expect(requestHandlers.moduleDetailHandler).toHaveBeenCalledWith({slug});

  });

  afterEach(() => {
    wrapper.destroy();
    mockClient = null;
    apolloProvider = null;
  });


});