import { mount } from '@vue/test-utils';
import { nextTick } from 'vue';
import WidgetRebase from '~/vue_merge_request_widget/components/states/mr_widget_rebase.vue';
import eventHub from '~/vue_merge_request_widget/event_hub';
import toast from '~/vue_shared/plugins/global_toast';

jest.mock('~/vue_shared/plugins/global_toast');

let wrapper;

function createWrapper(propsData, mergeRequestWidgetGraphql) {
  wrapper = mount(WidgetRebase, {
    propsData,
    data() {
      return {
        state: {
          rebaseInProgress: propsData.mr.rebaseInProgress,
          targetBranch: propsData.mr.targetBranch,
          userPermissions: {
            pushToSourceBranch: propsData.mr.canPushToSourceBranch,
          },
        },
      };
    },
    provide: { glFeatures: { mergeRequestWidgetGraphql } },
    mocks: {
      $apollo: {
        queries: {
          state: { loading: false },
        },
      },
    },
  });
}

describe('Merge request widget rebase component', () => {
  const findRebaseMessage = () => wrapper.find('[data-testid="rebase-message"]');
  const findRebaseMessageText = () => findRebaseMessage().text();
  const findStandardRebaseButton = () => wrapper.find('[data-testid="standard-rebase-button"]');
  const findRebaseWithoutCiButton = () => wrapper.find('[data-testid="rebase-without-ci-button"]');

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

  [true, false].forEach((mergeRequestWidgetGraphql) => {
    describe(`widget graphql is ${mergeRequestWidgetGraphql ? 'enabled' : 'disabled'}`, () => {
      describe('while rebasing', () => {
        it('should show progress message', () => {
          createWrapper(
            {
              mr: { rebaseInProgress: true },
              service: {},
            },
            mergeRequestWidgetGraphql,
          );

          expect(findRebaseMessageText()).toContain('Rebase in progress');
        });
      });

      describe('with permissions', () => {
        const rebaseMock = jest.fn().mockResolvedValue();
        const pollMock = jest.fn().mockResolvedValue({});

        it('renders the warning message', () => {
          createWrapper(
            {
              mr: {
                rebaseInProgress: false,
                canPushToSourceBranch: true,
              },
              service: {
                rebase: rebaseMock,
                poll: pollMock,
              },
            },
            mergeRequestWidgetGraphql,
          );

          const text = findRebaseMessageText();

          expect(text).toContain('Merge blocked');
          expect(text.replace(/\s\s+/g, ' ')).toContain(
            'the source branch must be rebased onto the target branch',
          );
        });

        it('renders an error message when rebasing has failed', async () => {
          createWrapper(
            {
              mr: {
                rebaseInProgress: false,
                canPushToSourceBranch: true,
              },
              service: {
                rebase: rebaseMock,
                poll: pollMock,
              },
            },
            mergeRequestWidgetGraphql,
          );

          // setData usage is discouraged. See https://gitlab.com/groups/gitlab-org/-/epics/7330 for details
          // eslint-disable-next-line no-restricted-syntax
          wrapper.setData({ rebasingError: 'Something went wrong!' });

          await nextTick();
          expect(findRebaseMessageText()).toContain('Something went wrong!');
        });

        describe('Rebase buttons', () => {
          beforeEach(() => {
            createWrapper(
              {
                mr: {
                  rebaseInProgress: false,
                  canPushToSourceBranch: true,
                },
                service: {
                  rebase: rebaseMock,
                  poll: pollMock,
                },
              },
              mergeRequestWidgetGraphql,
            );
          });

          it('renders both buttons', () => {
            expect(findRebaseWithoutCiButton().exists()).toBe(true);
            expect(findStandardRebaseButton().exists()).toBe(true);
          });

          it('starts the rebase when clicking', async () => {
            findStandardRebaseButton().vm.$emit('click');

            await nextTick();

            expect(rebaseMock).toHaveBeenCalledWith({ skipCi: false });
          });

          it('starts the CI-skipping rebase when clicking on "Rebase without CI"', async () => {
            findRebaseWithoutCiButton().vm.$emit('click');

            await nextTick();

            expect(rebaseMock).toHaveBeenCalledWith({ skipCi: true });
          });
        });

        describe('Rebase when pipelines must succeed is enabled', () => {
          beforeEach(() => {
            createWrapper(
              {
                mr: {
                  rebaseInProgress: false,
                  canPushToSourceBranch: true,
                  onlyAllowMergeIfPipelineSucceeds: true,
                },
                service: {
                  rebase: rebaseMock,
                  poll: pollMock,
                },
              },
              mergeRequestWidgetGraphql,
            );
          });

          it('renders only the rebase button', () => {
            expect(findRebaseWithoutCiButton().exists()).toBe(false);
            expect(findStandardRebaseButton().exists()).toBe(true);
          });

          it('starts the rebase when clicking', async () => {
            findStandardRebaseButton().vm.$emit('click');

            await nextTick();

            expect(rebaseMock).toHaveBeenCalledWith({ skipCi: false });
          });
        });

        describe('Rebase when pipelines must succeed and skipped pipelines are considered successful are enabled', () => {
          beforeEach(() => {
            createWrapper(
              {
                mr: {
                  rebaseInProgress: false,
                  canPushToSourceBranch: true,
                  onlyAllowMergeIfPipelineSucceeds: true,
                  allowMergeOnSkippedPipeline: true,
                },
                service: {
                  rebase: rebaseMock,
                  poll: pollMock,
                },
              },
              mergeRequestWidgetGraphql,
            );
          });

          it('renders both rebase buttons', () => {
            expect(findRebaseWithoutCiButton().exists()).toBe(true);
            expect(findStandardRebaseButton().exists()).toBe(true);
          });

          it('starts the rebase when clicking', async () => {
            findStandardRebaseButton().vm.$emit('click');

            await nextTick();

            expect(rebaseMock).toHaveBeenCalledWith({ skipCi: false });
          });

          it('starts the CI-skipping rebase when clicking on "Rebase without CI"', async () => {
            findRebaseWithoutCiButton().vm.$emit('click');

            await nextTick();

            expect(rebaseMock).toHaveBeenCalledWith({ skipCi: true });
          });
        });
      });

      describe('without permissions', () => {
        const exampleTargetBranch = 'fake-branch-to-test-with';

        describe('UI text', () => {
          beforeEach(() => {
            createWrapper(
              {
                mr: {
                  rebaseInProgress: false,
                  canPushToSourceBranch: false,
                  targetBranch: exampleTargetBranch,
                },
                service: {},
              },
              mergeRequestWidgetGraphql,
            );
          });

          it('renders a message explaining user does not have permissions', () => {
            const text = findRebaseMessageText();

            expect(text).toContain(
              'Merge blocked: the source branch must be rebased onto the target branch.',
            );
            expect(text).toContain('the source branch must be rebased');
          });

          it('renders the correct target branch name', () => {
            const elem = findRebaseMessage();

            expect(elem.text()).toContain(
              'Merge blocked: the source branch must be rebased onto the target branch.',
            );
          });
        });

        it('does render the "Rebase without pipeline" button', () => {
          createWrapper(
            {
              mr: {
                rebaseInProgress: false,
                canPushToSourceBranch: false,
                targetBranch: exampleTargetBranch,
              },
              service: {},
            },
            mergeRequestWidgetGraphql,
          );

          expect(findRebaseWithoutCiButton().exists()).toBe(true);
        });
      });

      describe('methods', () => {
        it('checkRebaseStatus', async () => {
          jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
          createWrapper(
            {
              mr: {},
              service: {
                rebase() {
                  return Promise.resolve();
                },
                poll() {
                  return Promise.resolve({
                    data: {
                      rebase_in_progress: false,
                      should_be_rebased: false,
                      merge_error: null,
                    },
                  });
                },
              },
            },
            mergeRequestWidgetGraphql,
          );

          wrapper.vm.rebase();

          // Wait for the rebase request
          await nextTick();
          // Wait for the polling request
          await nextTick();
          // Wait for the eventHub to be called
          await nextTick();

          expect(eventHub.$emit).toHaveBeenCalledWith('MRWidgetRebaseSuccess');
          expect(toast).toHaveBeenCalledWith('Rebase completed');
        });
      });
    });
  });
});