// ==UserScript==
// @name         软考系统架构师真题隐藏答案，添加显示答案按钮
// @namespace    https://blog.csdn.net/
// @version      1.1.0
// @description  CSND 软考系统架构师真题 答题助手。进入页面自动隐藏答案，增加显示隐藏答案按钮。
// @author       ccr 
// @match        https://blog.csdn.net/Last_Impression/article/details/*
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    // Your code here...

    setTimeout(function () {
        let blockquoteSubjects = document.querySelectorAll('blockquote');
        console.log('blockquoteSubjects', blockquoteSubjects)
        for (let i = 0; i < blockquoteSubjects.length; i++) {
            let subject = blockquoteSubjects[i];

            let showBut = document.createElement("a");
            showBut.innerText = "显示答案";
            showBut.onclick = function () {
                console.log(subject)
                let styleVisibilitV = subject.nextElementSibling.style.visibility;
                if (styleVisibilitV === 'hidden') {
                    subject.nextElementSibling.style.visibility = 'visible'
                    showBut.innerText = "隐藏答案";
                } else if (styleVisibilitV === 'visible') {
                    subject.nextElementSibling.style.visibility = 'hidden'
                    showBut.innerText = "显示答案";
                }
            };

            let strong = subject.querySelector('strong');
            if (strong) {
                strong.parentElement.insertBefore(showBut, strong.nextSibling)
            } else {
                subject.appendChild(showBut)
            }

            subject.nextElementSibling.style.visibility = 'hidden'
        }
    }, 500)

})();