// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import {assert} from 'chai';
import sinon from 'sinon';
import {MrIssuePage} from './mr-issue-page.js';
import {store, resetState} from 'reducers/base.js';
import * as issueV0 from 'reducers/issueV0.js';
import {prpcClient} from 'prpc-client-instance.js';

let element;
let loadingElement;
let fetchErrorElement;
let deletedElement;
let movedElement;
let issueElement;

function populateElementReferences() {
  loadingElement = element.querySelector('#loading');
  fetchErrorElement = element.querySelector('#fetch-error');
  deletedElement = element.querySelector('#deleted');
  movedElement = element.querySelector('#moved');
  issueElement = element.querySelector('#issue');
}

describe('mr-issue-page', () => {
  beforeEach(() => {
    store.dispatch(resetState());
    element = document.createElement('mr-issue-page');
    document.body.appendChild(element);
    sinon.stub(prpcClient, 'call');
    // TODO(ehmaldonado): Remove once the old autocomplete code is deprecated.
    window.TKR_populateAutocomplete = () => {};
  });

  afterEach(() => {
    document.body.removeChild(element);
    prpcClient.call.restore();
    // TODO(ehmaldonado): Remove once the old autocomplete code is deprecated.
    window.TKR_populateAutocomplete = undefined;
  });

  it('initializes', () => {
    assert.instanceOf(element, MrIssuePage);
  });

  describe('_pageTitle', () => {
    it('displays loading when no issue', () => {
      assert.equal(element._pageTitle({}, {}), 'Loading issue...');
    });

    it('display issue ID when available', () => {
      assert.equal(element._pageTitle({projectName: 'test', localId: 1}, {}),
          '1 - Loading issue...');
    });

    it('display deleted issues', () => {
      assert.equal(element._pageTitle({projectName: 'test', localId: 1},
          {projectName: 'test', localId: 1, isDeleted: true},
      ), '1 - Deleted issue');
    });

    it('displays loaded issue', () => {
      assert.equal(element._pageTitle({projectName: 'test', localId: 2},
          {projectName: 'test', localId: 2, summary: 'test'}), '2 - test');
    });
  });

  it('issue not loaded yet', async () => {
    // Prevent unrelated Redux changes from affecting this test.
    // TODO(zhangtiff): Find a more canonical way to test components
    // in and out of Redux.
    sinon.stub(store, 'dispatch');

    element.fetchingIssue = true;

    await element.updateComplete;
    populateElementReferences();

    assert.isNotNull(loadingElement);
    assert.isNull(fetchErrorElement);
    assert.isNull(deletedElement);
    assert.isNull(issueElement);

    store.dispatch.restore();
  });

  it('no loading on future issue fetches', async () => {
    element.issue = {localId: 222};
    element.fetchingIssue = true;

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(loadingElement);
    assert.isNull(fetchErrorElement);
    assert.isNull(deletedElement);
    assert.isNotNull(issueElement);
  });

  it('fetch error', async () => {
    element.fetchingIssue = false;
    element.fetchIssueError = 'error';

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(loadingElement);
    assert.isNotNull(fetchErrorElement);
    assert.isNull(deletedElement);
    assert.isNull(issueElement);
  });

  it('deleted issue', async () => {
    element.fetchingIssue = false;
    element.issue = {isDeleted: true};

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(loadingElement);
    assert.isNull(fetchErrorElement);
    assert.isNotNull(deletedElement);
    assert.isNull(issueElement);
  });

  it('normal issue', async () => {
    element.fetchingIssue = false;
    element.issue = {localId: 111};

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(loadingElement);
    assert.isNull(fetchErrorElement);
    assert.isNull(deletedElement);
    assert.isNotNull(issueElement);
  });

  it('code font pref toggles attribute', async () => {
    await element.updateComplete;

    assert.isFalse(element.hasAttribute('codeFont'));

    element.prefs = new Map([['code_font', true]]);
    await element.updateComplete;

    assert.isTrue(element.hasAttribute('codeFont'));

    element.prefs = new Map([['code_font', false]]);
    await element.updateComplete;

    assert.isFalse(element.hasAttribute('codeFont'));
  });

  it('undeleting issue only shown if you have permissions', async () => {
    sinon.stub(store, 'dispatch');

    element.issue = {isDeleted: true};

    await element.updateComplete;
    populateElementReferences();

    assert.isNotNull(deletedElement);

    let button = element.querySelector('.undelete');
    assert.isNull(button);

    element.issuePermissions = ['deleteissue'];
    await element.updateComplete;

    button = element.querySelector('.undelete');
    assert.isNotNull(button);

    store.dispatch.restore();
  });

  it('undeleting issue updates page with issue', async () => {
    const issueRef = {localId: 111, projectName: 'test'};
    const deletedIssuePromise = Promise.resolve({
      issue: {isDeleted: true},
    });
    const issuePromise = Promise.resolve({
      issue: {localId: 111, projectName: 'test'},
    });
    const deletePromise = Promise.resolve({});

    sinon.spy(element, '_undeleteIssue');

    prpcClient.call.withArgs('monorail.Issues', 'GetIssue', {issueRef})
        .onFirstCall().returns(deletedIssuePromise)
        .onSecondCall().returns(issuePromise);
    prpcClient.call.withArgs('monorail.Issues', 'DeleteIssue',
        {delete: false, issueRef}).returns(deletePromise);

    store.dispatch(issueV0.viewIssue(issueRef));
    store.dispatch(issueV0.fetchIssuePageData(issueRef));

    await deletedIssuePromise;
    await element.updateComplete;

    populateElementReferences();

    assert.deepEqual(element.issue,
        {isDeleted: true, localId: 111, projectName: 'test'});
    assert.isNull(issueElement);
    assert.isNotNull(deletedElement);

    // Make undelete button visible. This must be after deletedIssuePromise
    // resolves since issuePermissions are cleared by Redux after that promise.
    element.issuePermissions = ['deleteissue'];
    await element.updateComplete;

    const button = element.querySelector('.undelete');
    button.click();

    sinon.assert.calledWith(prpcClient.call, 'monorail.Issues', 'GetIssue',
        {issueRef});
    sinon.assert.calledWith(prpcClient.call, 'monorail.Issues', 'DeleteIssue',
        {delete: false, issueRef});

    await deletePromise;
    await issuePromise;
    await element.updateComplete;

    assert.isTrue(element._undeleteIssue.calledOnce);

    assert.deepEqual(element.issue, {localId: 111, projectName: 'test'});

    await element.updateComplete;

    populateElementReferences();
    assert.isNotNull(issueElement);

    element._undeleteIssue.restore();
  });

  it('issue has moved', async () => {
    element.fetchingIssue = false;
    element.issue = {movedToRef: {projectName: 'hello', localId: 10}};

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(issueElement);
    assert.isNull(deletedElement);
    assert.isNotNull(movedElement);

    const link = movedElement.querySelector('.new-location');
    assert.equal(link.getAttribute('href'), '/p/hello/issues/detail?id=10');
  });

  it('moving to a restricted issue', async () => {
    element.fetchingIssue = false;
    element.issue = {localId: 111};

    await element.updateComplete;

    element.issue = {localId: 222};
    element.fetchIssueError = 'error';

    await element.updateComplete;
    populateElementReferences();

    assert.isNull(loadingElement);
    assert.isNotNull(fetchErrorElement);
    assert.isNull(deletedElement);
    assert.isNull(movedElement);
    assert.isNull(issueElement);
  });
});