// ==UserScript==
// @name         文章导出成pdf
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  将一些主流的网站的文章，去除掉一些无关部分直接启动浏览器自带打印功能
// @author       Vanisper
// @match        https://zhuanlan.zhihu.com/p/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=zhihu.com
// @require      https://unpkg.com/jspdf@2.5.1/dist/jspdf.umd.min.js
// @require      https://cdn.bootcdn.net/ajax/libs/html2canvas/1.4.1/html2canvas.min.js
// @grant        none
// @license MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    // Your code here...
    // window.jsPDF = window.jspdf.jsPDF;
    function smoothScrollToBottom() {
        var scrollHeight = document.body.scrollHeight;
        var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
        var clientHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;

        if (scrollTop + clientHeight >= scrollHeight) {
            // 到达底部，停止滚动
            window.print();
            return;
        } else {
            // 滚动到下一页
            window.scrollTo({
                top: scrollTop + clientHeight,
                behavior: 'auto'
            });
            // 延时执行，等待页面加载完成
            setTimeout(smoothScrollToBottom, 200);
        }
    }
    const urls = [{
        r: "zhuanlan.zhihu.com/p/",
        n: "zhihu",
        s: "article",
        class: ".Catalog, .ColumnPageHeader-Wrapper, .RichContent-actions, .RichContent-actions, .Post-NormalSub, .Post-SideActions, .setpdf, .complementary, .CornerAnimayedFlex",
        style: "Button CornerButton Button--red",
    }];
    var currentUrl = window.location.href;
    var flag = false;
    var curr = {r: "", n: "", s: "",class:"",style:""};
    urls.some((e, _i)=>{
        if(currentUrl.includes(e.r)){
            curr.r = currentUrl;
            curr.n = window.location.hostname.split(".")[window.location.hostname.split(".").length - 2];
            curr.s = e.s;
            curr.class = e.class;
            curr.style = e.style;
            flag = true;
            return true;
        }
    })
    if(flag){
        window.addEventListener('load', function() {
            var style = document.createElement('style');
            style.innerHTML = `@media print {${curr.class} {display: none;}}`;
            document.head.appendChild(style);
            var dom = document.querySelector(curr.s);
            const btn = document.createElement("button");
            btn.appendChild(document.createTextNode("导出pdf"));
            btn.setAttribute('style', 'position: fixed;top: 50%;right: 200px;');
            btn.setAttribute('class', `setpdf ${curr.style}`);
            dom.appendChild(btn);
            btn.onclick = ()=>{
                window.scrollTo(0, 0);
                smoothScrollToBottom();
            }
        });

    }

})();