// ==UserScript==
// @name        火箭按钮
// @namespace   https://docs.scriptcat.org/
// @version     0.7.6
// @description 极其简洁的下载链接加速器按钮，对Github的文件下载链接，通过镜像加速器进行下载所需文件。（支持 releases 和 Download ZIP）
// @author      flowsaro.com
// @match       *://github.com/*
// @icon        data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAACXBIWXMAAAsTAAALEwEAmpwYAAACxUlEQVR4nO3dMW8SYRzH8duKg5Nuhdo3UNib+hoUlqeNielm1LVLt7obEyOkATqQmG6Y6FSXGh3VOBjQNlUDDQ+yOPEGzjwrPFdLwD6/g+8n+U+Xu3ue+6YJhaZEEQDgf7tX+5o1tVbXN+5Y6PUtHLN/srpZb8e+ccdCr2/hGIJoMQTRYgiixRAkjK1qe8PUWo2xqbebiUHq7abvHHet0PtJPVNrbyc9+EnHXSv0flLPEESLIYgWQxAthiBaDEG0GIJoMQTRYgiixRBEiyFIGFvV05vuTcGxOWjtzCzIQWvHdw9379D7l+Pe/Nuc0YOf/Cen1Qi9fzkEEUMQMQQRQxAxBEl5kAcvv8ftHz3vuGMEueIgjw9P4t/9vnceHRJkagQRQxAxBBFDkJQE2X11Gr/+2Bmboy/dxCDumO+c3eYpQaYN8uzoLPHBTzruWgS5JIKIIYgYgoghSIpeZb351Bmbt/94leU7x12LIJfE7yFiCCKGIGIIIoYgc/CJ4befPe/wieEM8Jm6GIKIIYgYgoghiBiCBLJUrHzIFMu/Ruf2k3fDUEHcvX1rcmuN5l2mVO5kSpV4dNb3joPEcOPu7VuTW2s07wgihiBiCCKGIAFcv/viRqZYrnqnVB6mKMgwaR9uj1FaLN3ZX/VvMHk0g1QSx+0xSguCiCGIGIKIIYgYgoghiBiCiCGIGIKIIYiYa8XnWd8ncBfN+t7xmam1zke/T+p++fOfh0/fx7MYdy3Pd1adu3tPul63x2gR2Vxh264U4plMrsD/XJyWJYgWSxAtliBaLEG0WIJosQTRYgmixRJEiyWIFksQLZYgWixBtFiCaLEE0WIJosUSRIsliJZ+Lr/RW8k3RsfmCs0LHnzTd467Vuj9zK3BrcJqUhB3LPT6Fs6AIFoGBNEyIIiWAUG09JbXsr1cvuud5bXF/CM2AIiu1F+d56Qeo24SAwAAAABJRU5ErkJggg==
// @grant       none
// @noframes
// @license     All Rights Reserved
// ==/UserScript==

(function () {
    'use strict';

    const mirrorSites = [
        { name: "gh-proxy.com", url: "https://gh-proxy.com" },
        { name: "gh-proxy.org", url: "https://gh-proxy.org" },
        { name: "ghproxy.com",  url: "https://mirror.ghproxy.com" },
    ];

    let currentMirror = mirrorSites[0];

    function mirrorUrl(m, original) {
        return m.url.replace(/\/+$/, "") + "/" + original;
    }

    // ---------- 样式 ----------
    const style = document.createElement("style");
    style.textContent = `
        .gh-mirror-split {
            position: relative;
            display: inline-flex;
            align-items: stretch;
            margin-left: 8px;
            vertical-align: middle;
            flex-shrink: 0;            /* 防止按钮被 li 压缩 */
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
        }
        .gh-mirror-split a,
        .gh-mirror-split button {
            font-size: 12px;
            line-height: 20px;
            padding: 3px 12px;
            border: 1px solid var(--color-border-default, #d0d7de);
            background-color: var(--color-btn-bg, #f6f8fa);
            color: var(--color-fg-default, #24292f);
            cursor: pointer;
            text-decoration: none !important;
            box-shadow: var(--color-btn-shadow, 0 1px 0 rgba(27,31,36,0.04));
            transition: background-color 0.1s ease;
            box-sizing: border-box;
        }
        .gh-mirror-split a:hover,
        .gh-mirror-split a:active,
        .gh-mirror-split a:focus,
        .gh-mirror-split button:hover {
            text-decoration: none !important;
            background-color: var(--color-btn-hover-bg, #f3f4f6);
            border-color: var(--color-btn-hover-border, #d0d7de);
        }
        .gh-mirror-split .split-main {
            border-radius: 6px 0 0 6px;
            border-right: none;
        }
        .gh-mirror-split .split-arrow {
            border-radius: 0 6px 6px 0;
            padding-left: 8px;
            padding-right: 8px;
        }
        .gh-mirror-menu {
            position: absolute;
            right: 0;
            top: calc(100% + 4px);
            min-width: 160px;
            margin: 0;
            padding: 4px 0;
            list-style: none;
            background-color: var(--color-canvas-overlay, #ffffff);
            border: 1px solid var(--color-border-default, #d0d7de);
            border-radius: 6px;
            box-shadow: var(--color-shadow-large, 0 8px 24px rgba(140,149,159,0.2));
            z-index: 9999;
            display: none;
        }
        .gh-mirror-menu.open { display: block; }
        .gh-mirror-menu li {
            padding: 4px 12px;
            font-size: 12px;
            cursor: pointer;
            color: var(--color-fg-default, #24292f);
            white-space: nowrap;
        }
        .gh-mirror-menu li:hover {
            background-color: var(--color-accent-subtle, #ddf4ff);
            color: var(--color-accent-fg, #0969da);
        }
        .gh-mirror-menu li.selected {
            color: var(--color-accent-fg, #0969da);
            font-weight: 600;
        }
        /* 包含加速按钮的 li：a 与按钮水平平铺 */
        li.gh-mirror-li {
            display: flex !important;
            align-items: center;
        }
    `;
    document.head.appendChild(style);

    // ---------- 全局工具 ----------
    function closeAllMenus() {
        document.querySelectorAll(".gh-mirror-menu.open").forEach(m => m.classList.remove("open"));
    }

    document.addEventListener("click", function (e) {
        if (!e.target.closest(".gh-mirror-split")) closeAllMenus();
    });

    function updateMainLinks() {
        document.querySelectorAll(".gh-mirror-split .split-main").forEach(a => {
            const original = a.dataset.originalHref;
            if (original) {
                a.href = mirrorUrl(currentMirror, original);
                a.title = "通过 " + currentMirror.name + " 下载";
            }
        });
    }

    // ---------- 创建分体按钮 ----------
    function addSplitToLink(link) {
        if (link.dataset.mirrorSplit) return;
        link.dataset.mirrorSplit = "1";

        const wrap = document.createElement("span");
        wrap.className = "gh-mirror-split";

        const main = document.createElement("a");
        main.className = "split-main";
        main.dataset.originalHref = link.href;
        main.href = mirrorUrl(currentMirror, link.href);
        main.textContent = "下载";
        main.title = "通过 " + currentMirror.name + " 下载";
        main.target = "_blank";
        main.rel = "noopener noreferrer";
        main.dataset.mirrorSplit = "1";

        const arrow = document.createElement("button");
        arrow.type = "button";
        arrow.className = "split-arrow";
        arrow.textContent = "▾";
        arrow.title = "选择镜像下载";
        arrow.setAttribute("aria-label", "选择镜像下载");

        const menu = document.createElement("ul");
        menu.className = "gh-mirror-menu";
        mirrorSites.forEach(m => {
            const li = document.createElement("li");
            li.dataset.mirrorUrl = m.url;
            li.dataset.mirrorName = m.name;
            li.addEventListener("click", function (e) {
                e.stopPropagation();
                window.open(mirrorUrl(m, link.href), "_blank");
                currentMirror = m;
                updateMainLinks();
                updateSelectedMarkers();
                closeMenu();
            });
            menu.appendChild(li);
        });

        function updateSelectedMarkers() {
            menu.querySelectorAll("li").forEach(li => {
                const selected = li.dataset.mirrorUrl === currentMirror.url;
                li.classList.toggle("selected", selected);
                li.textContent = (selected ? "✓ " : "") + li.dataset.mirrorName;
            });
        }
        updateSelectedMarkers();

        arrow.addEventListener("click", function (e) {
            e.stopPropagation();
            const isOpen = menu.classList.contains("open");
            closeAllMenus();
            if (!isOpen) menu.classList.add("open");
        });

        function closeMenu() { menu.classList.remove("open"); }

        wrap.appendChild(main);
        wrap.appendChild(arrow);
        wrap.appendChild(menu);

        // ---------- 插入：与 a 同级，放入同一个 li ----------
        link.parentNode.insertBefore(wrap, link.nextSibling);

        // Download ZIP：给所在 li 加 flex，让 a 和按钮水平平铺
        if (link.href.includes("archive/refs/heads") && link.parentNode.tagName === "LI") {
            link.parentNode.classList.add("gh-mirror-li");
        }
    }

    // ---------- 防抖处理动态加载 ----------
    let debounceTimer;
    function processLinks() {
        clearTimeout(debounceTimer);
        debounceTimer = setTimeout(() => {
            observer.disconnect();
            document.querySelectorAll(
                "a[href*='releases/download']:not([data-mirror-split]), " +
                "a[href*='archive/refs/heads']:not([data-mirror-split])"
            ).forEach(addSplitToLink);
            observer.observe(document.body, { childList: true, subtree: true });
        }, 250);
    }

    const observer = new MutationObserver(processLinks);
    observer.observe(document.body, { childList: true, subtree: true });

    processLinks();
})();