// ==UserScript==
// @name         CSDN阅读美化（新、旧版兼容|去广告|自动全文|简洁）
// @namespace    http://www.csdn.net/
// @icon         https://favicon.yandex.net/favicon/csdn.net
// @version      0.0.8-20180328
// @description  自动阅读全文；去广告；布局及格式优化；优化内容推荐展示样式；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/*
// @match        https://blog.csdn.net/*
// @grant        none
// @run-at       document-body
// @downloadURL none
// ==/UserScript==
(function() {
    'use strict';
    //初始化一个 document.ready 事件
    (function () {
        var ie = !!(window.attachEvent && !window.opera);
        var wk = /webkit\/(\d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525);
        var fn = [];
        var run = function () {
            for (var i = 0; i < fn.length; i++) fn[i]();
        };
        var d = document;
        d.ready = function (f) {
            if (!ie && !wk && d.addEventListener)
                return d.addEventListener('DOMContentLoaded', f, false);
            if (fn.push(f) > 1) return;
            if (ie)
                (function () {
                    try {
                        d.documentElement.doScroll('left');
                        run();
                    }
                    catch (err) {
                        setTimeout(arguments.callee,0);
                    }
                })();
            else if (wk)
                var t = setInterval(function () {
                    if (/^(loaded|complete)$/.test(d.readyState)){
                        clearInterval(t);
                        run();
                    }
                }, 0);
        };
    })();

    function getScrollTop(){
        var scrollTop = 0, bodyScrollTop = 0, documentScrollTop = 0;
        if(document.body){
            bodyScrollTop = document.body.scrollTop;
        }
        if(document.documentElement){
            documentScrollTop = document.documentElement.scrollTop;
        }
        scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
        return scrollTop;
    }
    //文档的总高度
    function getScrollHeight(){
        var scrollHeight = 0, bodyScrollHeight = 0, documentScrollHeight = 0;
        if(document.body){
            bodyScrollHeight = document.body.scrollHeight;
        }
        if(document.documentElement){
            documentScrollHeight = document.documentElement.scrollHeight;
        }
        scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;
        return scrollHeight;
    }
    function getWindowHeight(){
        var windowHeight = 0;
        if(document.compatMode == "CSS1Compat"){
            windowHeight = document.documentElement.clientHeight;
        }else{
            windowHeight = document.body.clientHeight;
        }
        return windowHeight;
    }

    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+='.pulllog-box { display:none !important; }';
        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 ,#layerd,#nav_show_top_stop, .QRcodebg1';
        s+='{ 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,.yd_a_d_feed_cla';
        s+='{ 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);
        }
    }

    function hidden(items) {
        var s= items.toString() + ' { display: none !important; }';
        //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 {
        if ('blog.csdn.net' ==location.host){
            //修改原来烦人的样式
            addStyle();
            document.ready(function(){
                //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(function(item){
                    if(!item.innerText.trim() && !item.querySelector('img,a') )
                        item.parentElement.removeChild(item);
                });
                window.addEventListener('scroll',()=>{
                    if(getScrollTop() + getWindowHeight() > getScrollHeight()-10){
                        document.querySelectorAll('dl[class=""]').forEach(function(item){
                            item.parentElement.removeChild(item);
                        });

                        document.querySelectorAll('iframe').forEach(function(item){
                            if ((item.src && item.src.indexOf('pos.baidu.com')>0)  ){
                                item.parentElement.removeChild(item);
                            }
                        });
                    }
                });

                setTimeout(function(){
                    //CSDN
                    var hideArr = [];
                    document.querySelectorAll('div[id]').forEach(function(item){
                        if (item.id.startsWith('BAIDU_SSP'))
                            hideArr.push('#' + item.id);
                    });

                    document.querySelectorAll('dl[class=""]').forEach(function(item){
                        item.parentElement.removeChild(item);
                    });

                    document.querySelectorAll('iframe').forEach(function(item){
                        if ((item.src && item.src.indexOf('pos.baidu.com')>0)  ){
                            if(item.parentElement.id.length > 0)
                                hideArr.push('#' + item.parentElement.id);
                            else
                                item.parentElement.style.display = 'none !important;';
                        }
                    });
                    if (hideArr.length > 0)
                        hidden(hideArr);
                },200);

            });
        }
    } catch (e) {
        console.log(e);
    }
})();