// ==UserScript==
// @name         ResearchGate下载PDF
// @namespace    http://tampermonkey.net/
// @version      0.5
// @description  打开ResearchGate下载PDF页面
// @author       HuanZhi
// @match        https://www.researchgate.net/*
// @grant        unsafewindow
// @license      MIT
// @run-at       document-end
// @downloadURL none
// ==/UserScript==
(function(){
    //添加按钮显示
    AddDownloadButton()
}
)();

// 下载按钮
function AddDownloadButton(){
    var download_btn = document.createElement("button");
    download_btn.setAttribute('style', "position:absolute; z-index:1000; right:15px; top:60px; height:28px; background-color:#3E8CD0; border:none; color:white; font-size:16px; cursor:pointer; border-radius:1em;");
    download_btn.setAttribute('id', "download_btn");
    download_btn.textContent = '输入关键词';
    document.body.appendChild(download_btn);
    download_btn.onmouseover = function() {
        this.style.backgroundColor="#e9686b";
    };
    download_btn.onmouseout = function() {
        this.style.backgroundColor="#3E8CD0";
    };
    download_btn.onclick = startSearchQueue;
    
    // 监听滚动事件，更新按钮位置
    window.addEventListener('scroll', function() {
        // 更新按钮的top位置
        download_btn.style.top = window.pageYOffset + 60 + 'px';
    });
}

// Function to display the prompt and start the search
function startSearchQueue() {
        const keywords = prompt("输入关键词,逗号分割:");
        if (keywords) {
            const keywordArray = keywords.split(',').map(k => k.trim());
            searchNextKeyword(keywordArray);
        }
    }

// Function to search the next keyword in the queue
function searchNextKeyword(keywordQueue) {
    if (keywordQueue.length === 0) {
        alert("All keywords have been searched.");
        return;
    }

    const keyword = keywordQueue.shift();
    performSearch(keyword);
    link.href = document.querySelector('.nova-legacy-c-button.nova-legacy-c-button--align-center.nova-legacy-c-button--radius-full.nova-legacy-c-button--size-s.nova-legacy-c-button--color-blue.nova-legacy-c-button--theme-ghost').href;
    window.open(link.href, '_blank');

    // Set a timeout to wait for the search to complete before moving to the next keyword
    setTimeout(() => searchNextKeyword(keywordQueue), 5000); // Wait 5 seconds before the next search
}

// Function to perform the search
function performSearch(keyword) {
    const searchInput = document.querySelector('input[name="query"]');
    const searchButton = document.querySelector('button[type="submit"]');

    if (searchInput && searchButton) {
        searchInput.value = keyword;
        searchButton.click();
    }
}