/**
 * Collabora 导航/跳转功能模块
 *
 * @encoding UTF-8
 */

import { sendUnoCommand } from '../Uno';

/**
 * 滚动到文档开头 (带焦点请求)
 * @param iframeWindow - iframe 的 contentWindow
 */
export async function unoScrollToTop(iframeWindow: Window): Promise<void> {
    // 1. 先请求 iframe 获取焦点
    const focusMessage = {
        MessageId: 'custompostMessage',
        Values: {
            Command: 'REQUEST_FOCUS',
            Args: {},
        },
    };
    console.log('[custompostMessage] 请求焦点 (滚动到顶部)');
    iframeWindow.postMessage(JSON.stringify(focusMessage), '*');

    // 2. 等待焦点激活
    await new Promise((resolve) => setTimeout(resolve, 100));

    // 3. 发送滚动命令，要发三次，有时候卡在表格里面就是需要多发几次
    sendUnoCommand(iframeWindow, '.uno:GoToStartOfDoc', {});
    sendUnoCommand(iframeWindow, '.uno:GoToStartOfDoc', {});
    sendUnoCommand(iframeWindow, '.uno:GoToStartOfDoc', {});
}