// ==UserScript==
// @name         💡WebPreview - 信息直达
// @namespace    https://ez118.github.io/
// @version      0.2
// @description  支持国内主流搜索引擎的搜索结果快速预览(直达网页文本大纲)
// @author       ZZY_WISU
// @match        https://*.bing.com/*
// @match        https://www.baidu.com/*
// @match        https://www.so.com/*
// @connect      *
// @license      GNU GPLv3
// @icon         https://cn.bing.com/sa/simg/favicon-trans-bg-blue-mg.ico
// @run-at document-end
// @grant        GM_xmlhttpRequest
// @grant        GM_download
// @grant        GM_registerMenuCommand
// @grant        GM_addStyle
// @grant        GM_setValue
// @grant        GM_getValue
// @downloadURL none
// ==/UserScript==

var ReaderFlag1 = false; /* 用于存储阅读器元素是否被创建 */
var ReaderFlag2 = false; /* 用于存储阅读器是否为开启状态 */

function runAsync(url,send_type,data_ry) {
    var p = new Promise((resolve, reject)=> {
        GM_xmlhttpRequest({
            method: send_type, url: url, headers: {"Content-Type": "application/x-www-form-urlencoded;charset=utf-8"}, data: data_ry,
            onload: function(response){resolve(response.responseText);}, onerror: function(response){reject("请求失败");}
        });
    });
    return p;
}

function escapeHtml(str) {
    return str.replace(/[&<>"']/g, function(match) {
        switch (match) {
           case '&':
              //return '&amp;';
              return '&';
           case '<':
              return '&lt;';
           case '>':
              return '&gt;';
           case '"':
              return '&quot;';
           case '\'':
              return '&#39;';
           default:
              return '';
        }
    });
}

function getWebContents(txt) {
    var links;
    var images;
    var content;
    /* 获取所有链接 */
    /*links = txt.match(/href\=\"(https?|http|ftp|file):\/\/[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]/g);
    for(let i = 0; i < links.length; i ++) {
        links[i] = links[i].replace("href=\"", "");
    }*/
    links = [];
    txt.replace(/<a [^>]*href=['"]([^'"]+)[^>]*>/g,function(match, capture){
        links.push(capture);
    });
    //console.log(links);

    /* 获取所有图片 */
    //images = txt.match(/<img[^<>]*src=[\"]([^\"]+)[\"][^<>]*>/im);
    images = [];
    txt.replace(/<img [^>]*src=['"]([^'"]+)[^>]*>/g,function(match, capture){
        images.push(capture);
    });
    //console.log(images);

    /* 获取文本 */
    content = txt.replace(/<\/div>/g, "</div>\n").replace(/<\/table>/g, "</table>\n")
    content = content.replace(/<\/h3>/g, "</h3>\n").replace(/<\/p>/g, "</p>\n")
    content = content.replace(/<\/li>/g, "</li>\n").replace(/<br>/g, "\n")
    content = content.replace(/<br\/>/g, "\n").replace(/<script(.*?)<\/script>/gis, "")
    content = content.replace(/<style(.*?)<\/style>/gis, "").replace(/<nav(.*?)<\/nav>/gis, "");

    content = content.replace(/<a(.*?)<\/a>/gis, "");

    content = content.replace(/<[^>]+>/g, "")
    content = escapeHtml(content);

    var content_len = content.length;
    content = content.substring(0, content_len);
    const search_txt = ["  ", "　　", "\n\n", "\r\r", "\t\t", "\n\r\n\r", "\r\n\r\n", "\t\r\n"];
    const replace_txt = ["", "", "", "", "", "", "", ""];
    for (let i = 0; i < search_txt.length; i++) {
        content = content.split(search_txt[i]).join(replace_txt[i]);
    }
    
    content = content.replace(/\r\n/g,"<br/>").replace(/\n/g,"<br/>").replace(/<br\/><br\/><br\/>/g, "");
    //console.log(content);

    return {"link":links,"image":images,"content":content};
}

function openReader(url) {
    if (ReaderFlag1 == false) {
        let previewReader = document.createElement("div");
        previewReader.setAttribute("class", "userscript-webPreviewReader");
        previewReader.setAttribute("style", "display:block;");
        previewReader.setAttribute("id", "userscript-webPreviewReader");
        document.body.appendChild(previewReader);
        ReaderFlag1 = true;
        ReaderFlag2 = true;
    } else {
        let previewReader = document.getElementById("userscript-webPreviewReader");
        previewReader.setAttribute("style", "display:block;");
        ReaderFlag2 = true;
    }
    var previewReader = document.getElementById("userscript-webPreviewReader");
    previewReader.innerHTML = "<b>加载中...</b>";

    runAsync(url, "GET", "").then((result)=>{ return result; }).then(function(result){
        let reslist = getWebContents(result);
        let linkhtml = "", imghtml = "";


        for(let i = 0; i < reslist.link.length; i ++){
            let link_tmp = reslist.link[i];
            if(link_tmp.includes("https://") || link_tmp.includes("http://")){
                linkhtml += "<a class='link' target='_blank' href='" + link_tmp + "'> 🔗&nbsp;" + link_tmp + " </a><br>";
            }
        }

        for(let i = 0; i < reslist.image.length; i ++){
            imghtml += "<img class='image' src='" + reslist.image[i] + "' onerror='this.remove()'/>";
        }

        previewReader.innerHTML = `
        <button class="CloseButton" onclick='this.parentNode.setAttribute("style", "display:none;");'>关闭</button>
        <div class="ImageList" style="max-height:103px;">
			<!--<b>图像: </b><br/>-->
            <p class='ShowImgList' align='right' style='' onclick='this.parentNode.setAttribute("style", "");'>所有图片</p>
            ` + imghtml + `
		</div>

		<div class="LinkList" style="max-height:286px;">
            <p class='ShowImgList' align='right' style='' onclick='this.parentNode.setAttribute("style", "");'>所有链接</p>
            ` + linkhtml + `
		</div>
		<div class="ContentShow">
			<b>文本: </b>
            ` + reslist.content + `
		</div>`;
    });
}

(function() {
    'use strict';
    var url = window.location.href;
    var paths = url.split("/");

    GM_addStyle(`.userscript-webPreviewBtn { background:#FFF; padding:3px 13px; margin-left:5px; border-radius:15px; border:1px solid #666; cursor:pointer; }
                 .userscript-webPreviewBtn:active { background:#eee; }
                 .userscript-webPreviewReader { position:fixed; top:0; right:0; z-index:9999; width:40%; height:100%; min-width:350px; background:#FFF; overflow:auto; }
                 .ShowImgList{ margin:0;padding:0;width:100%;cursor:pointer;color:#138AF1;user-select:none; }
                 .image{ height:85px; margin-bottom:8px; margin-right:5px; border-radius:15px; object-fit:contain; max-width:calc(100% - 20px); }
                 .link{ text-decoration:none; color:#001ba0; }
                 .link:hover{ text-decoration:underline; }
                 .ImageList{ padding:10px; margin:5px; border:2px solid #f4effb; background:#f4effb; border-radius:15px; overflow:hidden; }
                 .LinkList{ padding:10px; margin:5px; border:2px solid #f4f1f6; background:#f4f1f6; border-radius:15px; overflow:hidden; }
                 .ContentShow{ padding:10px; margin:5px; border:2px solid #f2f2f2; background:#f2f2f2; border-radius:15px; }
                 .CloseButton{ background:#FFF; color:#000; padding:3px 13px; margin:5px 5px; margin-bottom:0px; border-radius:15px; border:1px solid #666; cursor:pointer; }
                 .CloseButton:hover{ background:#138AF1; border:1px solid #138AF1; color:#FFF; }
                 `);

    if (paths[2].includes("bing.com") && paths[3].includes("search")) {
        let resultItems = document.getElementsByClassName("b_algo");
        for(let i = 0; i < resultItems.length; i ++) {
            let resultItemLink = resultItems[i].getElementsByTagName("a")[0].href;
            let resultItemTitleEle = resultItems[i].getElementsByTagName("h2")[0];

            /* 向每一个搜索结果的标题部分添加按钮 */
            let previewBtn = document.createElement("button");
            let previewBtnTxt = document.createTextNode("💡");
            previewBtn.setAttribute("class", "userscript-webPreviewBtn");
            previewBtn.setAttribute("link-data", resultItemLink);
            resultItemTitleEle.appendChild(previewBtn);
            previewBtn.appendChild(previewBtnTxt);

            previewBtn.addEventListener("click", function(evt){
                let linkData = previewBtn.getAttribute("link-data");
                openReader(linkData);
            }, true);
        }
    }
})();