/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

// import 'vs/css!./media/quickInput';
import * as dom from '../../../../../vs/base/browser/dom';
import { URI } from '../../../../../vs/base/common/uri';
import { IdGenerator } from '../../../../../vs/base/common/idGenerator';

const iconPathToClass: Record<string, string> = {};
const iconClassGenerator = new IdGenerator('quick-input-button-icon-');

export function getIconClass(
  iconPath: { dark: URI; light?: URI } | undefined
): string | undefined {
  if (!iconPath) {
    return undefined;
  }
  let iconClass: string;

  const key = iconPath.dark.toString();
  if (iconPathToClass[key]) {
    iconClass = iconPathToClass[key];
  } else {
    iconClass = iconClassGenerator.nextId();
    dom.createCSSRule(
      `.${iconClass}`,
      `background-image: ${dom.asCSSUrl(iconPath.light || iconPath.dark)}`
    );
    dom.createCSSRule(
      `.vs-dark .${iconClass}, .hc-black .${iconClass}`,
      `background-image: ${dom.asCSSUrl(iconPath.dark)}`
    );
    iconPathToClass[key] = iconClass;
  }

  return iconClass;
}