// ==UserScript==
// @name         SCI RIS Helper
// @namespace    https://github.com/Doradx/CNKI-PDF-RIS-Helper/blob/master/SCI%20RIS%20Helper.user.js
// @version      0.8.3
// @description  download ris and associeted pdf for SCI.
// @description:zh-CN  自动关联SCI下载中的RIS文件和PDF, 使得导入RIS时可以自动导入PDF。
// @author       Dorad
// @license      MIT License
// @grant        GM.xmlHttpRequest
// @run-at       document-end
// @icon         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
// @require      https://cdn.jsdelivr.net/npm/jquery@3.4.1/dist/jquery.slim.min.js
// @include https://direct.mit.edu/neco/*
// @include https://ieeexplore.ieee.org/*document/*
// @include https://ascelibrary.org/doi/*
// @include https://nhess.copernicus.org/articles/*
// @include https://www.cambridge.org/core/journals/*
// @include https://www.mdpi.com/*
// @include http://en.cgsjournals.com/article/doi/*
// @include https://adgeo.copernicus.org/articles/*
// @include https://papers.ssrn.com/*
// @include https://www.sciencedirect.com/science/article/*
// @include https://onlinelibrary.wiley.com/doi/*
// @include https://*.onlinelibrary.wiley.com/doi/*
// @include https://pubs.acs.org/doi/*
// @include https://www.tandfonline.com/doi/*
// @include https://www.beilstein-journals.org/*
// @include https://www.eurekaselect.com/*/article*
// @include https://pubs.rsc.org/en/Content/*
// @include https://*.springer.com/article*
// @include https://*.springer.com/chapter/*
// @include https://*.springeropen.com/article*
// @include https://aip.scitation.org/doi/*
// @include https://www.nature.com/articles*
// @include https://*.sciencemag.org/content*
// @include https://journals.aps.org/*/abstract/10*
// @include https://www.nrcresearchpress.com/doi/10*
// @include https://iopscience.iop.org/article/10*
// @include https://www.cell.com/*/fulltext/*
// @include https://journals.lww.com/*
// @include https://*.biomedcentral.com/articles/*
// @include https://journals.sagepub.com/doi/*
// @include https://academic.oup.com/*/article/*
// @include https://www.karger.com/Article/*
// @include https://www.cambridge.org/core/journals/*/article/*
// @include https://www.annualreviews.org/doi/*
// @include https://www.jstage.jst.go.jp/article/*
// @include https://www.hindawi.com/journals/*
// @include https://www.cardiology.theclinics.com/article/*
// @include https://www.liebertpub.com/doi/*
// @include https://thorax.bmj.com/content/*
// @include https://journals.physiology.org/doi/*
// @include https://www.ahajournals.org/doi/*
// @include https://dl.acm.org/doi/*
// @include https://*.asm.org/content/*
// @include https://content.apa.org/*
// @include https://www.thelancet.com/journals/*/article/*
// @include https://jamanetwork.com/journals/*
// @include https://*.aacrjournals.org/content/*
// @include https://royalsocietypublishing.org/doi/*
// @include https://journals.plos.org/*/article*
// @include https://*.psychiatryonline.org/doi/*
// @include https://www.osapublishing.org/*/abstract.cfm*
// @include https://www.thieme-connect.de/products/ejournals/*
// @include https://journals.ametsoc.org/*/article/*
// @include https://www.frontiersin.org/articles/*
// @include https://www.worldscientific.com/doi/*
// @include https://www.nejm.org/doi/*
// @include https://ascopubs.org/doi/*
// @include https://www.jto.org/article/*
// @include https://www.jci.org/articles/*
// @include https://pubmed.ncbi.nlm.nih.gov/*
// @include https://www.spiedigitallibrary.org/conference-*
// @include https://www.ingentaconnect.com/content/*
// @include https://www.taylorfrancis.com/*
// @include https://www.science.org/doi/*
// @include https://www.scinapse.io/papers/*
// @include https://www.semanticscholar.org/paper/*
// @include https://www.researchgate.net/publication/*
// @include https://www.earthdoc.org/content/papers/*
// @include https://era.library.ualberta.ca/items*
// @include http://www.gcdz.org/en/article/*
// @downloadURL none
// ==/UserScript==

// jQuery.noConflict(true);
// var $ = unsafeWindow.jQuery;

let METAS;
let RIS;

$(document).ready(function () {
    console.log('SCI RIS Helper ———— Dorad, cug.xia@gmail.com')
    // load metas from html
    METAS = getMeta();
    let jobs = [getRisFromCuger(METAS.doi),getRisFromCrossCite(METAS.doi)];
/*    if (!METAS.hasOwnProperty('pdf') || METAS.pdf.slice(-4) !== '.pdf' || window.location.href.indexOf("springer") > 0) {
        jobs.push(getPdfLinkFromSciHubBasedOnDoi(METAS.doi));
    }
*/
    jobs.push(getPdfLinkFromSciHubBasedOnDoi(METAS.doi));
    Promise.all(jobs)
        .then((result) => {
            if(result[2].length>0)METAS['pdf'] = result[2];
            if(result[0].length){
                // get full ris from cuger.cn
                RIS = result[0]
            }else{
                RIS = result[1]
            }
            let risRefreshFlag = false;
            // update ris and push to cuger.cn
            if(RIS.indexOf('N2  - ')<0 && METAS.hasOwnProperty('abstract') && METAS.abstract.length){
                risRefreshFlag = true;
                const erIndex = RIS.indexOf('ER  - ');
                RIS = RIS.slice(0, erIndex) + "N2  - " + METAS.abstract + "\r\n" + RIS.slice(erIndex, RIS.length);
            }
            if (RIS.indexOf('L1  - ')<0 && METAS.hasOwnProperty('pdf') && METAS.pdf.length) {
                risRefreshFlag = true;
                const erIndex = RIS.indexOf('ER  - ');
                RIS = RIS.slice(0, erIndex) + "L1  - " + METAS.pdf + "\r\n" + RIS.slice(erIndex, RIS.length);
            }
            // push update to cuger.cn
            if(risRefreshFlag)pushRisToCuger(METAS.doi, RIS);
            return [RIS, METAS];
        })
        .then(() => {
            console.log('RIS:', RIS);
            console.log('METAS:', METAS);
            generateTheButton(RIS, METAS);
        })
        .catch((err) => {
            // 获取 metas 失败
            console.log('Error with get metas,', err);
        })
})

function generateTheButton(ris, metas) {
    const year = new Date().getFullYear();
    let sheet = $(`
    <div id="risBox">
    <a id="risDownload" style="width:100%; height:60px; display: inline-block; line-height:60px; text-align: center;font-size:24px;color:white;text-decoration:none;padding:0;margin:0;">RIS</a>
    <a href="https://blog.cuger.cn" style="width:100%; height:20px; display: inline-block; line-height:20px; text-align: center; font-size:8px;background:#0C344E;color:white;padding:0;margin:0;border-bottom-left-radius:10px;border-bottom-right-radius:10px;text-decoration:none;">Dorad © ${year}</a></div>`)
    var css = {
        'line-height': '1.42857143',
        'font-family': '"Arial","微软雅黑","Helvetica,sans-serif","Microsoft YaHei"',
        'font-size': '16px',
        'box-sizing': 'border-box',
        'border-radius': '10px',
        'margin': '0',
        'padding': '0',
        'width': '100px',
        'height': '80px',
        'cursor': 'pointer',
        'position': 'fixed',
        'bottom': '10%',
        'right': '20px',
        'z-index': '2147483647',
        'background': '#1B2821',
        'visibility': 'visible',
        'display': 'inline-block',
        'justify-content': 'center',
        'align-items': 'bottom',
    }
    $('body').append(sheet);
    $('div#risBox').css(css);
    // generate the Blob
    const blob = new Blob([ris], { type: "octet/stream" });
    const url = URL.createObjectURL(blob);
    var downloadFilename = metas.hasOwnProperty('title')&&metas.title.length>0 ? metas.title.replace("/", "@") + ".ris" : "download.ris";
    $("#risDownload").attr("href", url);
    $("#risDownload").attr("download", downloadFilename);
    /**
     * set the style.
     */
    let key = 'SCI-RIS-Helper_NONE';
    if(metas.hasOwnProperty('pdf') && metas.pdf.length && metas.hasOwnProperty('doi') && metas.doi.length && ris.length){
        $("#risDownload").text("PDF");
        $('#risBox').css("background", "#6ECB63");
        key = 'SCI-RIS-Helper_PDF';
    }else if(ris.length && metas.hasOwnProperty('doi') && metas.doi.length){
        $("#risDownload").text("RIS");
        $('#risBox').css("background", "#118ab2");
        key = 'SCI-RIS-Helper_RIS';
    }else{
        $("#risDownload").attr("href", "javascript:void(0);");
        $("#risDownload").text("NONE");
        $('#risBox').css("background", "#6E7582");
        key = 'SCI-RIS-Helper_NONE';
    }
    getCount(key);
    return sheet;
}


// load meta
function getMeta() {
    let metas = journalMetasAdaptor();
    const metaDict = {
        title: ["dc.title", "dc.Title", "DC.title", "citation_title", "wkhealth_title"],
        doi: ["citation_doi", "dc.identifier", "dc.Identifier", "DC.identifier", "dc.Source"],
        pdf: ["citation_pdf_url", "wkhealth_pdf_url"],
        abstract: ["dc.description", "dc.Description", "og:description", "og:Description", "citation_abstract"]
    }
    // search for generic fields
    for (var key in metaDict) {
        if (metas.hasOwnProperty(key)) {
            continue;
        }
        let searchStr = 'meta[name="' + metaDict[key].join('"],meta[name="') + '"]';
        searchStr += ',meta[property="' + metaDict[key].join('"],meta[property="') + '"]';
        let meta = $(searchStr);
        if (meta.length) {
            metas[key] = meta.attr("content");
            console.log(`Get common meta, ${key} = ${meta.attr("content")}`);
        }
    }
    // check doi using regrex
    if(metas.hasOwnProperty('doi') && !metas.doi.match(/10\.[^\s\/]+\/[^\s]+/)){
        delete metas.doi;
    }
    if (metas.hasOwnProperty('doi') && metas.doi.match(/10\.[^\s\/]+\/[^\s]+/).length) {
        metas.doi = metas.doi.match(/10\.[^\s\/]+\/[^\s]+/)[0];
    }
    return metas;
}


// get Refman
function getRisFromCrossCite(doi) {
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            url: "https://dx.doi.org/" + doi,
            method: "GET",
            headers: {
                "Accept": "application/x-research-info-systems"
            },
            onload: function (res) {
                if (res.status !== 200) {
                    console.log('Failed to get the refman information based on doi. DOI: ' + doi, '. HTTP Status Code: ',res.status);
                    resolve("");
                }
                let ris = res.responseText;
                resolve(ris);
            },
            onerror: function (err) {
                console.log('Failed to get the refman information based on doi. DOI: ' + doi, err);
                resolve("");
            }
        });
    });
}

// get pdf link from sci-hub
function getPdfLinkFromSciHubBasedOnDoi(doi) {
    // console.log(doi);
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            method: "GET",
            url: "https://sci-hub.se/" + doi,
            headers: {
                'Connection': 'keep-alive',
                'Accept': 'text/plain, */*; q=0.01',
                'X-Requested-With': 'XMLHttpRequest',
                'User-Agent': navigator.userAgent,
                'Content-Type': 'application/x-www-form-urlencoded',
                'Sec-Fetch-Site': 'same-origin',
                'Sec-Fetch-Mode': 'cors'
            },
            onload: function (res) {
                if (res.status == 200) {
                    try {
                        let doc = new DOMParser().parseFromString(res.responseText, 'text/html');
                        let pdfUrl = doc.getElementById('pdf').src;
                        pdfUrl = pdfUrl.slice(0, pdfUrl.indexOf('#'));
                        resolve(pdfUrl);
                    } catch (err) {
                        console.log("Failed to get the pdf from sci-hub, doi:" + doi);
                        resolve("");
                    }
                } else {
                    console.log("HTTP Error when get pdf url from sci-hub. " + res.status);
                    resolve("");
                }
            }
        });
    })
}

// [FAILED] get pdf url from science direct.
// can't get the cookies which are marked as HTTP Only.
function getPdfUrlForScienceDirect() {
    // get cookie from request.
    const articleConfig = $.parseJSON($('script[type="application/json"][data-iso-key="_0"]').text()).article;
    const urlMeta = articleConfig.pdfDownload.urlMetadata;
    console.log('start get pdf url from sciencedirect.');
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            url: `https://www.sciencedirect.com/${urlMeta.path}/${urlMeta.pii}${urlMeta.pdfExtension}?md5=${urlMeta.queryParams.md5}&pid=${urlMeta.queryParams.pid}`,
            method: "GET",
            headers: {
                'authority': 'www.sciencedirect.com',
                'pragma': 'no-cache',
                'cache-control': 'no-cache',
                'sec-ch-ua': '"Chromium";v="92", " Not A;Brand";v="99", "Google Chrome";v="92"',
                'sec-ch-ua-mobile': '?0',
                'dnt': '1',
                'upgrade-insecure-requests': '1',
                'user-agent': navigator.userAgent,
                'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
                'sec-fetch-site': 'none',
                'sec-fetch-mode': 'navigate',
                'sec-fetch-user': '?1',
                'sec-fetch-dest': 'document',
                'accept-language': 'en-CN,en;q=0.9,zh-CN;q=0.8,zh;q=0.7,en-GB;q=0.6,en-US;q=0.5',
                'cookie': document.cookie
            },
            onload: function (res) {
                if (res.status !== 200) {
                    console.log('Failed to get the PDF from ScienceDirect. HTTP Status Code: ' + res.status);
                    resolve("");
                }
                let html = $.parseHTML(res.responseText);
                if ($('div#redirect-message p', html).length) {
                    resolve($('div#redirect-message p', html).attr("href"));
                }
                console.log('None URL in the response from ScienceDirect. ', res);
                resolve("");
            },
            onerror: function (err) {
                console.log('Failed to get the pdf from ScienceDirect. ERROR: ', err);
                resolve("");
            }
        });
    });
}

// get ris from cuger.cn
function getRisFromCuger(doi){
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            method: "GET",
            url: "https://api.cuger.cn/article/" + doi,
            headers: {
                'Connection': 'keep-alive',
                'Accept': 'text/plain, */*; q=0.01',
                'X-Requested-With': 'XMLHttpRequest',
                'User-Agent': navigator.userAgent,
                'Content-Type': 'application/x-www-form-urlencoded',
                'Sec-Fetch-Site': 'same-origin',
                'Sec-Fetch-Mode': 'cors'
            },
            onload: function (res) {
                if (res.status == 200) {
                    const data = JSON.parse(res.responseText);
                    if(data.code==0){
                        console.log("Success to get ris from cuger.cn.");
                        resolve(data.data.ris);
                    }else{
                        console.log("Failed to get ris from cuger.cn, " + data.msg);
                        resolve("");
                    }
                } else {
                    console.log("HTTP Error when get ris from cuger.cn. " + res.status);
                    resolve("");
                }
            }
        });
    })
}

//
function pushRisToCuger(doi,ris){
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            method: "POST",
            url: "https://api.cuger.cn/article/",
            data: `doi=${doi}&ris=${ris}`,
            headers: {
                'Connection': 'keep-alive',
                'Accept': 'text/plain, */*; q=0.01',
                'X-Requested-With': 'XMLHttpRequest',
                'User-Agent': navigator.userAgent,
                'Content-Type': 'application/x-www-form-urlencoded',
                'Sec-Fetch-Site': 'same-origin',
                'Sec-Fetch-Mode': 'cors'
            },
            onload: function (res) {
                if (res.status == 200) {
                    const data = JSON.parse(res.responseText);
                    if(data.code==0){
                        console.log('Succeess to push ris to cuger.cn');
                    }
                    resolve()
                } else {
                    console.log("HTTP Error when psuh ris to cuger.cn. " + res.status);
                    resolve("");
                }
            }
        });
    })
}

function getCount(key){
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            method: "GET",
            url: "https://api.cuger.cn/count/" + key,
            headers: {
                'Connection': 'keep-alive',
                'Accept': 'text/plain, */*; q=0.01',
                'X-Requested-With': 'XMLHttpRequest',
                'User-Agent': navigator.userAgent,
                'Content-Type': 'application/x-www-form-urlencoded',
                'Sec-Fetch-Site': 'same-origin',
                'Sec-Fetch-Mode': 'cors'
            },
            onload: function (res) {
                if (res.status == 200) {
                    const data = JSON.parse(res.responseText);
                    console.log(`Key: ${data.data.key},Count: ${data.data.count}`);
                    resolve(res.responseText);
                } else {
                    console.log("HTTP Error when get pdf url from sci-hub. " + res.status);
                    resolve("");
                }
            }
        });
    })
}

/**
 * custom journal metas adaptor
 */

function journalMetasAdaptor() {
    let metas = {};
    /**
     * all the non standard journal
     */
    switch (window.location.host) {
        case 'ieeexplore.ieee.org':
            metas.title = $('meta[property="twitter:title"]').attr("content");
            metas.doi = $('div.stats-document-abstract-doi a').text();
            metas.title = $('h1.document-title span').text();
            break;
        case 'www.tandfonline.com':
        case 'dl.acm.org':
            metas.doi = $('meta[name="dc.Identifier"][scheme="doi"],meta[property="og:url"]').attr("content");
            metas.title = $('h1.citation__title,.NLM_article-title').text();
            metas.abstract = $('div.abstractInFull p').text();
            break;
        case 'www.sciencedirect.com':{
            if(!$('script[type="application/json"][data-iso-key="_0"]').text().length)break;
            const articleConfig = $.parseJSON($('script[type="application/json"][data-iso-key="_0"]').text());
            // console.log(articleConfig);
            // doi
            metas.doi = articleConfig.article.doi;
            // title
            metas.title = articleConfig.article.titleString;
            // abstract
            const abstractDivId = articleConfig.abstracts.content.slice(-1)[0]['$$'].slice(-1)[0]['$']['id'];
            // console.log('abstractDivId',abstractDivId);
            metas.abstract = $('div[id="'+abstractDivId+'"] p').text();
            break;
        }
        case 'pubs.acs.org':
            metas.abstract = $('meta[property="og:description"]').attr("content");
            break;
        case 'onlinelibrary.wiley.com':
            metas.abstract = $('div.abstract-group section div p').text();
            break;
        case 'www.cambridge.org':
            metas.abstract = $('div.abstract').text();
            break;
        case 'link.springer.com':
            metas.abstract = $('section.abstract,#Abs1-content,section.Abstract p').text();
            break;
        case 'ascelibrary.org':
            metas.abstract = $('article.article div p').text();
            break;
        case 'nhess.copernicus.org':
            metas.abstract = $('div.abstract p').text();
            break;
        case 'www.worldscientific.com':
            metas.title = $('h1.citation__title').text();
            metas.abstract = $('div.NLM_abstract p').text();
            break;
        case 'direct.mit.edu':
            metas.abstract = $('section.abstract p').text();
            break;
        case 'academic.oup.com':
            metas.doi = $('span.article-link-citation a').attr("href");
            break;
        case 'www.ingentaconnect.com':
            metas.abstract = $('div#Abst').text();
            break;
        case 'www.science.org':
            metas.doi = $('meta[name="dc.Relation"]').attr("content");
            break;
        case 'www.semanticscholar.org':
            metas.doi = $('meta[name="citation_pdf_url"]').attr("content");
            break;
        case 'www.researchgate.net':
            metas.doi = $('div.research-detail-meta div ul li.nova-legacy-e-list__item a.nova-legacy-e-link').attr("href");
            metas.title = $('div.content-page-header div div div div.nova-legacy-e-text').text();
            break;
        default:
    }
    // console.log(metas);
    return metas;
}