// ==UserScript==
// @name         自动滚动
// @namespace    http://tampermonkey.net/
// @version      6.3
// @description  0.1~10滚动；鼠标移出面板透明，先主页后内嵌容器全域回顶循环
// @author       You
// @match        *://*/*
// ==/UserScript==

(function() {
    'use strict';

    // 全局配置
    const cfg = {
        scrollStep: 0.8,
        minSpeed: 0.1,
        maxSpeed: 4,
        stepGap: 0.05,
        bottomDelay: 600,
        panelOpacityNormal: 1,
        panelOpacityHide: 0.25
    };

    let isRunning = false;
    let rafId = null;
    let mainPageDone = false;
    let innerContainersDone = false;
    let scrollContainerList = [];
    let pixelBuffer = 0; // 像素累加缓冲区，解决小于1px不动

    // 获取所有内嵌滚动容器
    function getInnerScrollContainers() {
        const containers = [];
        const allNodes = document.querySelectorAll('*');
        allNodes.forEach(el => {
            const style = getComputedStyle(el);
            const overflowY = style.overflowY;
            if (
                el !== document.documentElement &&
                el !== document.body &&
                (overflowY === 'auto' || overflowY === 'scroll') &&
                el.scrollHeight > el.clientHeight + 8
            ) {
                containers.push(el);
            }
        });
        return [...new Set(containers)];
    }

    // 主页面触底判断
    function checkMainPageBottom() {
        const scrollTop = window.scrollY;
        const totalHeight = document.documentElement.scrollHeight;
        const viewHeight = window.innerHeight;
        return scrollTop + viewHeight >= totalHeight - 12;
    }

    // 子容器触底判断
    function isContainerBottom(el) {
        return el.scrollTop + el.clientHeight >= el.scrollHeight - 6;
    }

    // 全部子容器滚动完成
    function allInnerDone() {
        return scrollContainerList.every(item => isContainerBottom(item));
    }

    // 所有滚动区域复位回顶部
    function resetAllScroll() {
        window.scrollTo({ top: 0, behavior: 'instant' });
        scrollContainerList.forEach(el => el.scrollTop = 0);
        mainPageDone = false;
        innerContainersDone = false;
        pixelBuffer = 0; // 重置缓冲数值
    }

    // 核心滚动循环：像素累加缓冲渲染
    function scrollLoop() {
        if (!isRunning) return;

        // 累加微小速度值到缓冲区
        pixelBuffer += cfg.scrollStep;

        // 攒够≥1像素，才执行滚动动作
        if (pixelBuffer >= 1) {
            const movePx = Math.floor(pixelBuffer);
            pixelBuffer = pixelBuffer - movePx; // 剩余小数继续留存累加

            if (!mainPageDone) {
                // 滚动主页面
                window.scrollBy(0, movePx);
                if (checkMainPageBottom()) {
                    mainPageDone = true;
                    scrollContainerList = getInnerScrollContainers();
                }
            } else if (!innerContainersDone) {
                // 滚动内嵌子容器
                scrollContainerList.forEach(el => {
                    if (!isContainerBottom(el)) {
                        el.scrollTop += movePx;
                    }
                });
                if (allInnerDone()) {
                    innerContainersDone = true;
                }
            } else {
                // 全部到底，延时回顶重启循环
                setTimeout(() => {
                    resetAllScroll();
                    if (isRunning) scrollLoop();
                }, cfg.bottomDelay);
                return;
            }
        }

        rafId = requestAnimationFrame(scrollLoop);
    }

    // 启停函数
    function startScroll() {
        cancelAnimationFrame(rafId);
        pixelBuffer = 0;
        isRunning = true;
        mainPageDone = false;
        innerContainersDone = false;
        startBtn.textContent = '暂停滚动';
        scrollLoop();
    }

    function stopScroll() {
        cancelAnimationFrame(rafId);
        isRunning = false;
        startBtn.textContent = '开始滚动';
    }

    // 悬浮控制面板 + 移入移出透明过渡
    const wrapPanel = document.createElement('div');
    wrapPanel.style = `
        position: fixed;
        right: 20px;
        bottom: 24px;
        z-index: 9999999;
        background: #ffffff;
        padding: 14px 16px;
        border-radius: 12px;
        box-shadow: 0 4px 18px rgba(0,0,0,0.15);
        display: flex;
        flex-direction: column;
        gap: 12px;
        min-width: 220px;
        opacity: ${cfg.panelOpacityNormal};
        transition: opacity 0.35s ease;
    `;

    wrapPanel.addEventListener('mouseleave', () => {
        wrapPanel.style.opacity = cfg.panelOpacityHide;
    });
    wrapPanel.addEventListener('mouseenter', () => {
        wrapPanel.style.opacity = cfg.panelOpacityNormal;
    });

    // 启停按钮
    const startBtn = document.createElement('button');
    startBtn.style = `
        width: 100%;
        background: #2563eb;
        color: #fff;
        border: none;
        padding: 9px 0;
        border-radius: 8px;
        font-size: 14px;
        cursor: pointer;
        transition: background 0.2s;
    `;
    startBtn.textContent = '开始滚动';
    startBtn.onmouseover = () => startBtn.style.background = '#1d4ed8';
    startBtn.onmouseout = () => startBtn.style.background = '#2563eb';

    // 速度显示+滑块区域
    const speedBox = document.createElement('div');
    speedBox.style = `display:flex;flex-direction:column;gap:6px;`;

    const speedText = document.createElement('div');
    speedText.style = `display:flex;justify-content:space-between;font-size:13px;color:#333;`;
    speedText.innerHTML = `<span>滚动速度</span><span id="speedVal">${cfg.scrollStep.toFixed(2)}</span>`;

    const speedSlider = document.createElement('input');
    speedSlider.type = 'range';
    speedSlider.min = cfg.minSpeed;
    speedSlider.max = cfg.maxSpeed;
    speedSlider.step = cfg.stepGap;
    speedSlider.value = cfg.scrollStep;
    speedSlider.style = `
        width: 100%;
        height: 6px;
        cursor: pointer;
        accent-color: #2563eb;
    `;

    speedSlider.addEventListener('input', () => {
        cfg.scrollStep = parseFloat(speedSlider.value);
        document.getElementById('speedVal').textContent = cfg.scrollStep.toFixed(2);
    });

    speedBox.append(speedText, speedSlider);
    wrapPanel.append(startBtn, speedBox);
    document.body.appendChild(wrapPanel);

    startBtn.onclick = () => isRunning ? stopScroll() : startScroll();

    // Alt+S 快捷键启停
    document.addEventListener('keydown', e => {
        if (e.altKey && e.key.toLowerCase() === 's') {
            e.preventDefault();
            isRunning ? stopScroll() : startScroll();
        }
    });

})();