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

import { IClipboardService } from '../../../../vs/platform/clipboard/common/clipboardService';
import { $ } from '../../../../vs/base/browser/dom';

export class BrowserClipboardService implements IClipboardService {
  declare readonly _serviceBrand: undefined;

  private readonly mapTextToType = new Map<string, string>(); // unsupported in web (only in-memory)

  async writeText(text: string, type?: string): Promise<void> {
    // With type: only in-memory is supported
    if (type) {
      this.mapTextToType.set(type, text);

      return;
    }

    // Guard access to navigator.clipboard with try/catch
    // as we have seen DOMExceptions in certain browsers
    // due to security policies.
    try {
      return await navigator.clipboard.writeText(text);
    } catch (error) {
      console.error(error);
    }

    // Fallback to textarea and execCommand solution

    const activeElement = document.activeElement;

    const textArea: HTMLTextAreaElement = document.body.appendChild(
      $('textarea', { 'aria-hidden': true })
    );
    textArea.style.height = '1px';
    textArea.style.width = '1px';
    textArea.style.position = 'absolute';

    textArea.value = text;
    textArea.focus();
    textArea.select();

    document.execCommand('copy');

    if (activeElement instanceof HTMLElement) {
      activeElement.focus();
    }

    document.body.removeChild(textArea);

    return;
  }

  async readText(type?: string): Promise<string> {
    // With type: only in-memory is supported
    if (type) {
      return this.mapTextToType.get(type) || '';
    }

    // Guard access to navigator.clipboard with try/catch
    // as we have seen DOMExceptions in certain browsers
    // due to security policies.
    try {
      return await navigator.clipboard.readText();
    } catch (error) {
      console.error(error);

      return '';
    }
  }

  private findText = ''; // unsupported in web (only in-memory)

  async readFindText(): Promise<string> {
    return this.findText;
  }

  async writeFindText(text: string): Promise<void> {
    this.findText = text;
  }
}