// ==UserScript==
// @name         CSDN阅读美化（新、旧版兼容）
// @namespace    http://www.csdn.net/
// @icon         https://favicon.yandex.net/favicon/csdn.net
// @version      0.0.2-201802024
// @description  自动阅读全文；布局位置格式优化；优化内容推荐展示样式；保留作者、相关文章、评论 ；图片居中；删除空段落；去除首行缩进；支持MathJax；（修改自新版CSDN阅读体验提升）
// @author       zhuzhuyule
// @license      GPL version 3
// @match        http://blog.csdn.net/*/article/details/*
// @grant        none
// @run-at       document-end
// @downloadURL none
// ==/UserScript==
(function() {
    'use strict';
    function addStyle() {
        var s='';
        //公共部分
        s+='*{transition: opacity 1s, width 1s;}';
        s+='h1 { "text-align": "center"; }';
        s+='.article_content p { margin:1em 0; "line-height": "1.75em";"color":"#2F2F2F"}';
        s+='.recommend_list { height: 90px; overflow-y: hidden; opacity:.2; }';
        s+='.recommend_list.show { height:auto;  overflow-y: visible;opacity:.2; }';
        s+='.recommend_list:hover { opacity:1; }';
        s+='article::after{content:"— The End —";color:#e0e0e0;text-align:center;width:100%;line-height:60px;margin-top:-40px;display:block;font-family:Monotype Corsiva,Blackadder ITC,Brush Script MT,Bradley Hand ITC,Bell MT;font-size:1.6em;padding-bottom:.6em;}';

        //旧版本
        s+='#homepageArticles { display: none !important; }';
        s+='#nav_show_top_stop { display: none !important; }';
        s+='#layerd { display: none !important; }';
        s+='.QRcodebg1 { display: none !important; }';
        s+='#com-quick-reply,#com-quick-collect,#com-d-top-a { min-width: 30px !important; width: 31px !important;}';
        s+='#com-quick-reply:hover,#com-quick-collect:hover,#com-d-top-a:hover { width: 90px !important;}';

        //新版本
        s+='.fixRight,.extension_other,.fixRight_box,.persion_article { display: none !important;}';
        s+='.article_content,.article_content p,.article_content p span:not([class^=MathJax] span):not([class^=MathJax]):not([id^=MathJax] span):not([id^=MathJax]) {"font-family": "Microsoft YaHei,Consolas";"font-size": "15px" }';
        s+='.article_content p .MathJax { "font-size": "16px"; }';
        s+='.article_content p img{  "display": "block";"margin": "0 auto" }';

        //添加样式到 Head 中
        var head = document.head || document.getElementsByTagName('head')[0];
        if (head) {
            var style = document.createElement("style");
            style.type = "text/css";
            style.appendChild(document.createTextNode(s));
            head.appendChild(style);
        }
    }

    try {
        //修改原来烦人的样式
        addStyle();

        //自动展开全文
        var btnMore = document.querySelector('.readall_box a.btn.read_more_btn');
        if (btnMore)
            btnMore.click();

        //优化推荐列表显示效果
        var recommendList = document.querySelector('.recommend_list');
        if (recommendList){
            var func = function(){
                this.classList.add('show');
                recommendList.removeEventListener('mousemove',func);
            };
            recommendList.addEventListener('mousemove',func);
        }

        //删除空白段落
        var paragraph = document.querySelectorAll('.article_content p');
        paragraph.forEach(item=>{
            if(!item.innerText.trim() && !item.querySelector(img,a) )
                item.parentElement.removeChild(item);
        });
    } catch (e) {
        console.log(e);
    }
})();