// ==UserScript==
// @id             CNKI_PDF_Supernova
// @name           知网PDF下载助手
// @version        3.2.0
// @namespace      https://github.com/supernovaZhangJiaXing/Tampermonkey/
// @author         Supernova
// @description    直接以PDF格式下载知网上的文献, 包括期刊论文和博硕士论文
// @include        http*://*.cnki.net/*
// @include        http*://*.cnki.net.*/*
// @include        */DefaultResult/Index*
// @include        */KNS8/AdvSearch*
// @include        */detail.aspx*
// @include        */CatalogViewPage.aspx*
// @include        */Article/*
// @include        */kns/brief/*
// @include        */kns55/brief/*
// @include        */grid2008/brief/*
// @include        */detail/detail.aspx*
// @exclude        http://image.cnki.net/*
// @require        https://unpkg.com/pdf-lib@1.13.0/dist/pdf-lib.js
// @require        https://cdn.jsdelivr.net/gh/tabedit/code-segment@f730e9d9573c4ca7e758766e6a8fb282faae38af/outline.esm.js
// @run-at         document-idle
// @grant          unsafeWindow
// @grant          GM_setClipboard
// @grant          GM_xmlhttpRequest
// @downloadURL none
// ==/UserScript==

'use strict';
var $ = unsafeWindow.jQuery;
var contents = '';
var pdf;

$(document).ready(function() {
    var myurl = window.location.href;
    var isDetailPage = myurl.indexOf("detail.aspx") != -1 ? true: false; // 点进文献后的详情页
    var isContentPage = myurl.indexOf("kdoc/download.aspx?") != -1 ? true : false; // 分章下载

    if (isDetailPage === false) {
        if (window.location.href.indexOf("kns8") != -1){ // 文献检索页面, 防止在别处出现
            $(document).ajaxSuccess(function() {
                if (arguments[2].url.indexOf('/Brief/GetGridTableHtml') + 1) {
                    // 防止标志-链接不匹配, 统一默认转换为PDF
                    $('.downloadlink').attr('href', toPDF);
                    convert_box.innerText = "当前默认下载格式: PDF (点击转换)";
                }
            });
            var convert_box = document.createElement("div");
            convert_box.innerText = "当前默认下载格式: PDF (点击转换)";
            convert_box.className = "ecp_tn-tab";
            convert_box.style = "color: blue; font-weight: bolder";
            convert_box.onclick = function() {
                if (convert_box.innerText == "当前默认下载格式: PDF (点击转换)") {
                    convert_box.innerText = "当前默认下载格式: CAJ (点击转换)";
                    $('.downloadlink').attr('href', toCAJ);
                } else if (convert_box.innerText == "当前默认下载格式: CAJ (点击转换)") {
                    convert_box.innerText = "当前默认下载格式: PDF (点击转换)";
                    $('.downloadlink').attr('href', toPDF);
                }
            };
            var mycnki = $('#icnki');
            mycnki.parent()[0].insertBefore(convert_box, mycnki.nextElementSibling);
        }
    }
    // 如果进了详情页, 博硕士论文下面会出现五个个按钮: 手机, 整本, 分页, 分章, 在线
    // 期刊论文下会有三个按钮
    else {
        // 只对"博硕论文"详情页做优化, 否则影响期刊页面的显示
        // 新版界面更改了详情页的显示方式, 通过类似CMFD的字样判断是否为博硕论文页面
        if (location.search.match(/dbcode=C[DM][FM]D&/i)) {
            // 整本下载替换为CAJ下载
            $(".btn-dlcaj").first().html($(".btn-dlcaj").first().html().replace("整本", "CAJ"));
            // pdf文件的url
            var pdf_url = $(".btn-dlpdf").remove().find("a").attr("href").replace("&dflag=downpage", "&dflag=pdfdown");
            // 添加PDF下载
            var pdf_down = $('<li class="btn-dlpdf"><a href=' + pdf_url + ' id="pdfDown" target="_blank" name = "pdfDown"><i></i>PDF下载</a></li>');
            $(".btn-dlcaj").first().after(pdf_down);
            // 从分章下载获取目录的URL
            var content_url = $(".btn-dlcaj:eq(1)").find("a").attr("href") || '?';
            content_url = 'https://chn.oversea.cnki.net/kcms/download.aspx' + content_url.match(/\?.*/)[0];
            GM_xmlhttpRequest({method: 'GET', url: content_url, onload: manage_contents});
            // 右侧添加使用说明
            $(".operate-btn").append($('<li class="btn-phone"><a target="_blank" href="https://mp.weixin.qq.com/s?__biz=MzU5MTY4NDUzMg==&mid=2247484384&idx=1&sn=6a135e824793d26b5bd8884b78c1f751&chksm=fe2a753bc95dfc2d3a5f6383553fc369894c5021619c85bb7554583bdcb8c10624bf2a7097e1&token=462651491&lang=zh_CN#rd">脚本说明</a></li>'));
            // 右侧底部添加工具下载(PdgContentEditor)
            $(".opts-down").append($('<div class="fl info" style="font-size: 13px; border-left: 1px solid #ddd;"><p class="total-inform" style="margin-left: 3px"><span>目录合并软件(PdgContentEditor)下载:<br /><a href="https://pan.baidu.com/s/12i-uv3xALmHOjKpnO691aw" target="_blank">https://pan.baidu.com/s/12i-uv3xALmHOjKpnO691aw</a></span></p></div>'))
        }
    }
});

function toCAJ() {
    return $(this).data('CAJ', this.href.replace(/&dflag=\w*|$/, '&dflag=nhdown')).data("CAJ");
}

function toPDF() {
    return $(this).data('PDF', this.href.replace(/&dflag=\w*|$/, '&dflag=pdfdown')).data("PDF");
}

function get_content(cnt_list){
    var contents = "";
    for (var i = 0; i < cnt_list.length - 1; i++) { // 长度减一, 因为最后一个是text
        var cnt_item = cnt_list[i].childNodes[1].childNodes[1];
        cnt_item = cnt_item.innerHTML;
        var cnt_page = cnt_list[i].childNodes[3].childNodes[0].textContent.trim().split("-")[0]; // 知网的目录给的是个范围, 正常只需要前半部分
        contents = contents + cnt_item.trim().replace(/&nbsp;/g, " ").replace(/ {4}/g, "\t") + "\t" + cnt_page + "\r\n";
    }
    return contents;
}

function manage_contents(xhr) {
    var cnt_list = $('tr', xhr.responseText); // 目录列表
    var contents = get_content(cnt_list); // 目录内容
    // 添加目录复制
    $('.btn-dlpdf').first().after($('<li class="btn-dlpdf"><a href="javascript:void(0);">目录复制</a></li>').click(function() {
        GM_setClipboard(contents); // 运用油猴脚本自带的复制函数
        window.alert('目录已复制到剪贴板');
    }));
    // 添加目录下载
    $('.btn-dlpdf').first().after($('<li class="btn-dlcaj"><a>目录下载</a></li>').click(function() {
        var data = new Blob([contents],{type:"text/plain; charset=UTF-8"});
        $(this).find('a').attr("download", '目录_' + $('.wx-tit h1:first-child()').text().trim() + '.txt');
        $(this).find('a').attr("href", window.URL.createObjectURL(data));
        window.URL.revokeObjectURL(data);
        window.alert("目录索引已保存, 请使用PdgCntEditor软件将目录整合到PDF中");
    }));
}