import { shallowMount } from '@vue/test-utils';
import axios from '~/lib/utils/axios_utils';

import { GlLoadingIcon } from '@gitlab/ui';
import { joinPaths, redirectTo } from '~/lib/utils/url_utility';

import SnippetEditApp from '~/snippets/components/edit.vue';
import SnippetDescriptionEdit from '~/snippets/components/snippet_description_edit.vue';
import SnippetVisibilityEdit from '~/snippets/components/snippet_visibility_edit.vue';
import SnippetBlobEdit from '~/snippets/components/snippet_blob_edit.vue';
import TitleField from '~/vue_shared/components/form/title.vue';
import FormFooterActions from '~/vue_shared/components/form/form_footer_actions.vue';

import UpdateSnippetMutation from '~/snippets/mutations/updateSnippet.mutation.graphql';
import CreateSnippetMutation from '~/snippets/mutations/createSnippet.mutation.graphql';

import AxiosMockAdapter from 'axios-mock-adapter';
import waitForPromises from 'helpers/wait_for_promises';
import { ApolloMutation } from 'vue-apollo';

jest.mock('~/lib/utils/url_utility', () => ({
  getBaseURL: jest.fn().mockReturnValue('foo/'),
  redirectTo: jest.fn().mockName('redirectTo'),
  joinPaths: jest
    .fn()
    .mockName('joinPaths')
    .mockReturnValue('contentApiURL'),
}));

let flashSpy;

const contentMock = 'Foo Bar';
const rawPathMock = '/foo/bar';
const rawProjectPathMock = '/project/path';
const newlyEditedSnippetUrl = 'http://foo.bar';
const apiError = { message: 'Ufff' };

const defaultProps = {
  snippetGid: 'gid://gitlab/PersonalSnippet/42',
  markdownPreviewPath: 'http://preview.foo.bar',
  markdownDocsPath: 'http://docs.foo.bar',
};

describe('Snippet Edit app', () => {
  let wrapper;
  let axiosMock;

  const resolveMutate = jest.fn().mockResolvedValue({
    data: {
      updateSnippet: {
        errors: [],
        snippet: {
          webUrl: newlyEditedSnippetUrl,
        },
      },
    },
  });

  const rejectMutation = jest.fn().mockRejectedValue(apiError);

  const mutationTypes = {
    RESOLVE: resolveMutate,
    REJECT: rejectMutation,
  };

  function createComponent({
    props = defaultProps,
    data = {},
    loading = false,
    mutationRes = mutationTypes.RESOLVE,
  } = {}) {
    const $apollo = {
      queries: {
        snippet: {
          loading,
        },
      },
      mutate: mutationRes,
    };

    wrapper = shallowMount(SnippetEditApp, {
      mocks: { $apollo },
      stubs: {
        FormFooterActions,
        ApolloMutation,
      },
      propsData: {
        ...props,
      },
      data() {
        return data;
      },
    });

    flashSpy = jest.spyOn(wrapper.vm, 'flashAPIFailure');
  }

  afterEach(() => {
    wrapper.destroy();
  });

  const findSubmitButton = () => wrapper.find('[type=submit]');
  const findCancellButton = () => wrapper.find('[data-testid="snippet-cancel-btn"]');

  describe('rendering', () => {
    it('renders loader while the query is in flight', () => {
      createComponent({ loading: true });
      expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
    });

    it('renders all required components', () => {
      createComponent();

      expect(wrapper.contains(TitleField)).toBe(true);
      expect(wrapper.contains(SnippetDescriptionEdit)).toBe(true);
      expect(wrapper.contains(SnippetBlobEdit)).toBe(true);
      expect(wrapper.contains(SnippetVisibilityEdit)).toBe(true);
      expect(wrapper.contains(FormFooterActions)).toBe(true);
    });

    it('does not fail if there is no snippet yet (new snippet creation)', () => {
      const snippetGid = '';
      createComponent({
        props: {
          ...defaultProps,
          snippetGid,
        },
      });

      expect(wrapper.props('snippetGid')).toBe(snippetGid);
    });

    it.each`
      title    | content  | expectation
      ${''}    | ${''}    | ${true}
      ${'foo'} | ${''}    | ${true}
      ${''}    | ${'foo'} | ${true}
      ${'foo'} | ${'bar'} | ${false}
    `(
      'disables submit button unless both title and content are present',
      ({ title, content, expectation }) => {
        createComponent({
          data: {
            snippet: { title },
            content,
          },
        });
        const isBtnDisabled = Boolean(findSubmitButton().attributes('disabled'));
        expect(isBtnDisabled).toBe(expectation);
      },
    );

    it.each`
      isNew    | status        | expectation
      ${true}  | ${`new`}      | ${`/snippets`}
      ${false} | ${`existing`} | ${newlyEditedSnippetUrl}
    `('sets correct href for the cancel button on a $status snippet', ({ isNew, expectation }) => {
      createComponent({
        data: {
          snippet: { webUrl: newlyEditedSnippetUrl },
          newSnippet: isNew,
        },
      });

      expect(findCancellButton().attributes('href')).toBe(expectation);
    });
  });

  describe('functionality', () => {
    describe('handling of the data from GraphQL response', () => {
      const snippet = {
        blob: {
          rawPath: rawPathMock,
        },
      };
      const getResSchema = newSnippet => {
        return {
          data: {
            snippets: {
              edges: newSnippet ? [] : [snippet],
            },
          },
        };
      };

      const bootstrapForExistingSnippet = resp => {
        createComponent({
          data: {
            snippet,
          },
        });

        if (resp === 500) {
          axiosMock.onGet('contentApiURL').reply(500);
        } else {
          axiosMock.onGet('contentApiURL').reply(200, contentMock);
        }
        wrapper.vm.onSnippetFetch(getResSchema());
      };

      const bootstrapForNewSnippet = () => {
        createComponent();
        wrapper.vm.onSnippetFetch(getResSchema(true));
      };

      beforeEach(() => {
        axiosMock = new AxiosMockAdapter(axios);
      });

      afterEach(() => {
        axiosMock.restore();
      });

      it('fetches blob content with the additional query', () => {
        bootstrapForExistingSnippet();

        return waitForPromises().then(() => {
          expect(joinPaths).toHaveBeenCalledWith('foo/', rawPathMock);
          expect(wrapper.vm.newSnippet).toBe(false);
          expect(wrapper.vm.content).toBe(contentMock);
        });
      });

      it('flashes the error message if fetching content fails', () => {
        bootstrapForExistingSnippet(500);

        return waitForPromises().then(() => {
          expect(flashSpy).toHaveBeenCalled();
          expect(wrapper.vm.content).toBe('');
        });
      });

      it('does not fetch content for new snippet', () => {
        bootstrapForNewSnippet();

        return waitForPromises().then(() => {
          // we keep using waitForPromises to make sure we do not run failed test
          expect(wrapper.vm.newSnippet).toBe(true);
          expect(wrapper.vm.content).toBe('');
          expect(joinPaths).not.toHaveBeenCalled();
          expect(wrapper.vm.snippet).toEqual(wrapper.vm.$options.newSnippetSchema);
        });
      });
    });

    describe('form submission handling', () => {
      it.each`
        newSnippet | projectPath           | mutation                 | mutationName
        ${true}    | ${rawProjectPathMock} | ${CreateSnippetMutation} | ${'CreateSnippetMutation with projectPath'}
        ${true}    | ${''}                 | ${CreateSnippetMutation} | ${'CreateSnippetMutation without projectPath'}
        ${false}   | ${rawProjectPathMock} | ${UpdateSnippetMutation} | ${'UpdateSnippetMutation with projectPath'}
        ${false}   | ${''}                 | ${UpdateSnippetMutation} | ${'UpdateSnippetMutation without projectPath'}
      `('should submit $mutationName correctly', ({ newSnippet, projectPath, mutation }) => {
        createComponent({
          data: {
            newSnippet,
          },
          props: {
            ...defaultProps,
            projectPath,
          },
        });

        const mutationPayload = {
          mutation,
          variables: {
            input: newSnippet ? expect.objectContaining({ projectPath }) : expect.any(Object),
          },
        };

        wrapper.vm.handleFormSubmit();
        expect(resolveMutate).toHaveBeenCalledWith(mutationPayload);
      });

      it('redirects to snippet view on successful mutation', () => {
        createComponent();
        wrapper.vm.handleFormSubmit();
        return waitForPromises().then(() => {
          expect(redirectTo).toHaveBeenCalledWith(newlyEditedSnippetUrl);
        });
      });

      it('flashes an error if mutation failed', () => {
        createComponent({
          mutationRes: mutationTypes.REJECT,
        });
        wrapper.vm.handleFormSubmit();
        return waitForPromises().then(() => {
          expect(redirectTo).not.toHaveBeenCalled();
          expect(flashSpy).toHaveBeenCalledWith(apiError);
        });
      });
    });
  });
});