// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from '../../../core/common/common.js';
import type * as Protocol from '../../../generated/protocol.js';
import * as IssuesManager from '../../../models/issues_manager/issues_manager.js';
import {
  renderElementIntoDOM,
} from '../../../testing/DOMHelpers.js';
import {describeWithLocale} from '../../../testing/EnvironmentHelpers.js';
import * as IconButton from '../icon_button/icon_button.js';
import * as RenderCoordinator from '../render_coordinator/render_coordinator.js';

import * as IssueCounter from './issue_counter.js';

const renderIssueLinkIcon = async(data: IssueCounter.IssueLinkIcon.IssueLinkIconData): Promise<{
  component: IssueCounter.IssueLinkIcon.IssueLinkIcon,
  shadowRoot: ShadowRoot,
}> => {
  const component = new IssueCounter.IssueLinkIcon.IssueLinkIcon();
  component.data = data;
  renderElementIntoDOM(component);
  assert.isNotNull(component.shadowRoot);
  await RenderCoordinator.done();
  return {component, shadowRoot: component.shadowRoot};
};

export const extractElements = (shadowRoot: ShadowRoot): {
  icon: IconButton.Icon.Icon,
  button: HTMLButtonElement,
} => {
  const icon = shadowRoot.querySelector('devtools-icon');
  assert.instanceOf(icon, IconButton.Icon.Icon);
  const button = shadowRoot.querySelector('button');
  assert.instanceOf(button, HTMLButtonElement);
  return {icon, button};
};

interface MockIssueResolverEntry {
  resolve: (issue: IssuesManager.Issue.Issue|null) => void;
  promise: Promise<IssuesManager.Issue.Issue|null>;
}

class MockIssueResolver {
  #promiseMap: Map<string, MockIssueResolverEntry> = new Map();

  waitFor(issueId?: string) {
    if (!issueId) {
      if (this.#promiseMap.size !== 1) {
        throw new Error('more than one issue being awaited, specify a issue id');
      }
      issueId = this.#promiseMap.keys().next().value;
    }
    issueId = issueId || '';
    const entry = this.#promiseMap.get(issueId);
    if (entry) {
      return entry.promise;
    }
    const {resolve, promise} = Promise.withResolvers<IssuesManager.Issue.Issue|null>();
    this.#promiseMap.set(issueId, {resolve, promise});
    return promise;
  }

  resolve(result: IssuesManager.Issue.Issue|null, issueId?: string): void {
    if (!issueId && this.#promiseMap.size === 1) {
      issueId = this.#promiseMap.keys().next().value;
    }
    issueId = issueId || result?.getIssueId() || '';
    const entry = this.#promiseMap.get(issueId);
    if (!entry) {
      throw new Error('resolve uninitialized');
    }
    entry.resolve(result);
    this.#promiseMap.delete(issueId);
  }
}

describeWithLocale('IssueLinkIcon', () => {
  const issueId = 'issue1' as Protocol.Audits.IssueId;
  const mockIssue = {
    getKind() {
      return IssuesManager.Issue.IssueKind.PAGE_ERROR;
    },
    getIssueId() {
      return issueId;
    },
    getDescription() {
      return null;
    },
  };

  describe('with simple issues', () => {
    const failingIssueResolver = {
      async waitFor() {
        throw new Error('Couldn\'t resolve');
      },
    };

    it('renders correctly without an issue', async () => {
      const {shadowRoot} = await renderIssueLinkIcon({
        issueId,
        issueResolver: failingIssueResolver as unknown as IssuesManager.IssueResolver.IssueResolver,
      });

      const {icon} = extractElements(shadowRoot);
      assert.strictEqual(icon.name, 'issue-questionmark-filled');
    });

    it('renders correctly with a "page error" issue', async () => {
      const {shadowRoot} = await renderIssueLinkIcon({
        issue: mockIssue as unknown as IssuesManager.Issue.Issue,
      });

      const {icon} = extractElements(shadowRoot);
      assert.strictEqual(icon.name, 'issue-cross-filled');
    });

    it('the style reacts to the presence of the issue', async () => {
      const {shadowRoot} = await renderIssueLinkIcon({
        issue: mockIssue as unknown as IssuesManager.Issue.Issue,
      });

      const {button} = extractElements(shadowRoot);
      assert.isTrue(button.classList.contains('link'));
    });

    it('the style reacts to the absence of an issue', async () => {
      const {shadowRoot} = await renderIssueLinkIcon({
        issueId,
        issueResolver: failingIssueResolver as unknown as IssuesManager.IssueResolver.IssueResolver,
      });

      const {button} = extractElements(shadowRoot);
      assert.isFalse(button.classList.contains('link'));
    });
  });

  describe('transitions upon issue resolution', () => {
    it('to change the style correctly', async () => {
      const resolver = new MockIssueResolver();
      const {shadowRoot} = await renderIssueLinkIcon({
        issueId,
        issueResolver: resolver as unknown as IssuesManager.IssueResolver.IssueResolver,
      });

      resolver.resolve(mockIssue as unknown as IssuesManager.Issue.Issue);
      await RenderCoordinator.done({waitForWork: true});

      assert.isTrue(extractElements(shadowRoot).button.classList.contains('link'));
    });

    it('handles multiple data assignments', async () => {
      const {shadowRoot, component} = await renderIssueLinkIcon({
        issue: mockIssue as unknown as IssuesManager.Issue.Issue,
      });

      const mockIssue2 = {
        getKind() {
          return IssuesManager.Issue.IssueKind.BREAKING_CHANGE;
        },
      };

      component.data = {
        issue: mockIssue2 as unknown as IssuesManager.Issue.Issue,
      };
      await RenderCoordinator.done({waitForWork: true});

      const {icon} = extractElements(shadowRoot);
      assert.strictEqual(icon.name, 'issue-exclamation-filled');
    });
  });

  describe('handles clicks correctly', () => {
    it('if the button is clicked', async () => {
      const revealOverride = sinon.fake(Common.Revealer.reveal);
      const {shadowRoot} = await renderIssueLinkIcon({
        issue: mockIssue as unknown as IssuesManager.Issue.Issue,
        revealOverride,
      });

      const {button} = extractElements(shadowRoot);
      button.click();
      assert.isTrue(revealOverride.called);
    });
  });
});