import React from 'react';

import { fireEvent, render, screen } from '@testing-library/react';
import MockAdapter from 'axios-mock-adapter';
import { act } from 'react-dom/test-utils';
import { IntlProvider } from 'react-intl';
import {
  generatePath, MemoryRouter, Route, Switch,
} from 'react-router';
import { Factory } from 'rosie';

import { initializeMockApp } from '@edx/frontend-platform';
import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
import { AppProvider } from '@edx/frontend-platform/react';

import { Routes, ThreadType } from '../../data/constants';
import { initializeStore } from '../../store';
import { DiscussionContext } from '../common/context';
import { threadsApiUrl } from './data/api';
import { PostsView } from './index';

import './data/__factories__';

const courseId = 'course-v1:edX+TestX+Test_Course';
let store;
let axiosMock;

async function renderComponent({
  postId, topicId, category, myPosts,
} = { myPosts: false }) {
  let path = generatePath(Routes.POSTS.ALL_POSTS, { courseId });
  let showOwnPosts = false;
  if (postId) {
    path = generatePath(Routes.POSTS.ALL_POSTS, { courseId, postId });
  } else if (topicId) {
    path = generatePath(Routes.POSTS.PATH, { courseId, topicId });
  } else if (category) {
    path = generatePath(Routes.TOPICS.CATEGORY, { courseId, category });
  } else if (myPosts) {
    path = generatePath(Routes.POSTS.MY_POSTS, { courseId });
    showOwnPosts = myPosts;
  }
  await render(
    <IntlProvider locale="en">
      <AppProvider store={store}>
        <MemoryRouter initialEntries={[path]}>
          <DiscussionContext.Provider value={{
            courseId,
            postId,
            topicId,
            category,
          }}
          >
            <Switch>
              <Route path={Routes.POSTS.MY_POSTS}>
                <PostsView showOwnPosts={showOwnPosts} />
              </Route>
              <Route
                path={[Routes.POSTS.PATH, Routes.POSTS.ALL_POSTS, Routes.TOPICS.CATEGORY]}
                component={PostsView}
              />
            </Switch>
          </DiscussionContext.Provider>
        </MemoryRouter>
      </AppProvider>
    </IntlProvider>,
  );
}

describe('PostsView', () => {
  const threadCount = 6;
  beforeEach(async () => {
    initializeMockApp({
      authenticatedUser: {
        userId: 3,
        username: 'abc123',
        administrator: true,
        roles: [],
      },
    });

    store = initializeStore({
      blocks: { blocks: { 'test-usage-key': { topics: ['some-topic-2', 'some-topic-0'] } } },
    });
    Factory.resetAll();
    axiosMock = new MockAdapter(getAuthenticatedHttpClient());
    axiosMock.onGet(threadsApiUrl)
      .reply((args) => {
        const threadAttrs = {};
        if (args.params.author) {
          threadAttrs.author = args.params.author;
        }
        return [200, Factory.build('threadsResult', {}, {
          topicId: undefined,
          count: threadCount,
          threadAttrs,
          pageSize: 6,
        })];
      });
  });

  describe('Basic', () => {
    test('displays a list of all posts', async () => {
      await act(async () => {
        await renderComponent();
      });
      expect(screen.getAllByText(/this is thread-\d+/i)).toHaveLength(threadCount);
    });
    test('displays a list of user posts', async () => {
      await act(async () => {
        await renderComponent({ myPosts: true });
      });
      expect(screen.getAllByText('abc123')).toHaveLength(threadCount);
    });
    test('displays a list of posts in a topic', async () => {
      await act(async () => {
        await renderComponent({ topicId: 'some-topic-1' });
      });
      expect(screen.getAllByText(/this is thread-\d+ in topic some-topic-1/i)).toHaveLength(Math.ceil(threadCount / 3));
    });
    test('displays a list of posts in a category', async () => {
      await act(async () => {
        await renderComponent({ category: 'test-usage-key' });
      });
      expect(screen.queryAllByText(/this is thread-\d+ in topic some-topic-1}/i)).toHaveLength(0);
      expect(screen.queryAllByText(/this is thread-\d+ in topic some-topic-2/i)).toHaveLength(Math.ceil(threadCount / 3));
      expect(screen.queryAllByText(/this is thread-\d+ in topic some-topic-0/i)).toHaveLength(Math.ceil(threadCount / 3));
    });
  });

  describe('Filtering', () => {
    let dropDownButton;

    function lastQueryParams() {
      const { params } = axiosMock.history.get[axiosMock.history.get.length - 1];
      return params;
    }

    beforeEach(async () => {
      await act(async () => {
        await renderComponent();
      });
      dropDownButton = screen.getByRole('button', {
        name: /all posts by recent activity/i,
      });
      await act(async () => {
        fireEvent.click(dropDownButton);
      });
    });
    test('test that the filter bar works', async () => {
      // 3 type filters: all, discussion, question
      // 5 status filters: any, unread, following, reported, unanswered
      // 3 sort: activity, comments, votes
      expect(screen.queryAllByRole('radio')).toHaveLength(11);
    });

    describe.each([
      {
        label: 'Discussions',
        queryParam: { thread_type: ThreadType.DISCUSSION },
      },
      {
        label: 'Questions',
        queryParam: { thread_type: ThreadType.QUESTION },
      },
      {
        label: 'Unread',
        queryParam: { view: 'unread' },
      },
      {
        label: 'Unanswered',
        queryParam: { view: 'unanswered' },
      },
      {
        label: 'Following',
        queryParam: { following: true },
      },
      {
        label: 'Reported',
        queryParam: { flagged: true },
      },
      {
        label: 'Most activity',
        queryParam: { order_by: 'comment_count' },
      },
      {
        label: 'Most votes',
        queryParam: { order_by: 'vote_count' },
      },
    ])(
      'one at a time',
      ({
        label,
        queryParam,
      }) => {
        test(`select "${label}"`, async () => {
          await act(async () => {
            fireEvent.click(screen.getByLabelText(label));
          });
          // Assert that changing the filters results in the correct query
          expect(lastQueryParams()).toMatchObject(queryParam);
        });
      },
    );

    describe.each([
      {
        firstClick: 'Discussions',
        secondClick: 'Unanswered',
        selected: ['Questions', 'Unanswered'],
      },
      {
        firstClick: 'Unanswered',
        secondClick: 'Discussions',
        selected: ['Discussions', 'Any'],
      },
      {
        firstClick: 'Questions',
        secondClick: 'Unread',
        selected: ['Discussions', 'Unread'],
      },
      {
        firstClick: 'Unread',
        secondClick: 'Questions',
        selected: ['Questions', 'Any'],
      },
    ])(
      'incompatible combinations',
      ({
        firstClick,
        secondClick,
        selected,
      }) => {
        test(`select "${firstClick}" then "${secondClick}"`, async () => {
          await act(async () => {
            fireEvent.click(screen.getByLabelText(firstClick));
          });
          await act(async () => {
            fireEvent.click(dropDownButton);
          });
          await act(async () => {
            fireEvent.click(screen.getByLabelText(secondClick));
          });
          await act(async () => {
            fireEvent.click(dropDownButton);
          });
          expect(screen.getAllByTestId('selected')[0]).toHaveTextContent(selected[0]);
          expect(screen.getAllByTestId('selected')[1]).toHaveTextContent(selected[1]);
        });
      },
    );
  });
});