// ==UserScript==
// @name         高级自动滚动控制器
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  支持调节滚动速度、方向、底部行为，且面板可最小化的自动滚动工具
// @author       yangwenren
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // 全局变量
    let isScrolling = false;
    let scrollSpeed = 5;         // 滚动速度
    let scrollDirection = 'down';// 滚动方向 (down/up)
    let bottomJump = true;       // 底部是否跳转顶部
    let panelMinimized = false;  // 面板是否最小化
    let scrollInterval;
    const MIN_SPEED = 1;
    const MAX_SPEED = 20;

    // 创建控制界面
    function createControlPanel() {
        // 主面板容器
        const panel = document.createElement('div');
        panel.id = 'scrollControlPanel';
        panel.style.cssText = `
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: rgba(255,255,255,0.95);
            border: 1px solid #ccc;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.2);
            z-index: 999999;
            font-family: Arial, sans-serif;
            width: 250px;
            transition: all 0.3s ease;
        `;

        // 标题栏（包含最小化按钮）
        const titleBar = document.createElement('div');
        titleBar.style.cssText = `
            padding: 8px 15px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: move;
        `;
        
        const title = document.createElement('h3');
        title.textContent = '高级滚动控制器';
        title.style.cssText = 'margin: 0; font-size: 15px;';
        
        const minBtn = document.createElement('button');
        minBtn.textContent = '−';
        minBtn.style.cssText = `
            width: 24px;
            height: 24px;
            border: none;
            background: transparent;
            font-size: 18px;
            cursor: pointer;
            line-height: 1;
            padding: 0;
            color: #666;
        `;
        minBtn.addEventListener('click', toggleMinimize);
        
        titleBar.append(title, minBtn);
        panel.appendChild(titleBar);

        // 内容区域（可折叠）
        const contentArea = document.createElement('div');
        contentArea.id = 'panelContent';
        contentArea.style.padding = '15px';

        // 速度控制
        const speedDiv = document.createElement('div');
        speedDiv.style.marginBottom = '12px';
        
        const speedLabel = document.createElement('label');
        speedLabel.textContent = `滚动速度: ${scrollSpeed}`;
        speedLabel.id = 'speedLabel';
        speedLabel.style.display = 'block';
        speedLabel.style.marginBottom = '5px';
        
        const speedSlider = document.createElement('input');
        speedSlider.type = 'range';
        speedSlider.min = MIN_SPEED;
        speedSlider.max = MAX_SPEED;
        speedSlider.value = scrollSpeed;
        speedSlider.style.width = '100%';
        speedSlider.addEventListener('input', function() {
            scrollSpeed = parseInt(this.value);
            document.getElementById('speedLabel').textContent = `滚动速度: ${scrollSpeed}`;
            if (isScrolling) updateScrollInterval();
        });
        
        speedDiv.append(speedLabel, speedSlider);
        contentArea.appendChild(speedDiv);

        // 方向控制
        const directionDiv = document.createElement('div');
        directionDiv.style.marginBottom = '12px';
        directionDiv.style.display = 'flex';
        directionDiv.style.alignItems = 'center';
        directionDiv.style.gap = '10px';
        
        const directionLabel = document.createElement('label');
        directionLabel.textContent = '滚动方向:';
        directionLabel.style.width = '80px';
        
        const directionSelect = document.createElement('select');
        directionSelect.style.flex = '1';
        directionSelect.innerHTML = `
            <option value="down">向下滚动</option>
            <option value="up">向上滚动</option>
        `;
        directionSelect.value = scrollDirection;
        directionSelect.addEventListener('change', function() {
            scrollDirection = this.value;
            if (isScrolling) updateScrollInterval();
        });
        
        directionDiv.append(directionLabel, directionSelect);
        contentArea.appendChild(directionDiv);

        // 底部跳转控制
        const jumpDiv = document.createElement('div');
        jumpDiv.style.marginBottom = '15px';
        jumpDiv.style.display = 'flex';
        jumpDiv.style.alignItems = 'center';
        jumpDiv.style.gap = '10px';
        
        const jumpLabel = document.createElement('label');
        jumpLabel.textContent = '底部行为:';
        jumpLabel.style.width = '80px';
        
        const jumpSelect = document.createElement('select');
        jumpSelect.style.flex = '1';
        jumpSelect.innerHTML = `
            <option value="jump">跳转顶部重新开始</option>
            <option value="reverse">反向滚动</option>
        `;
        jumpSelect.value = bottomJump ? 'jump' : 'reverse';
        jumpSelect.addEventListener('change', function() {
            bottomJump = this.value === 'jump';
            if (isScrolling) updateScrollInterval();
        });
        
        jumpDiv.append(jumpLabel, jumpSelect);
        contentArea.appendChild(jumpDiv);

        // 控制按钮
        const buttonDiv = document.createElement('div');
        buttonDiv.style.display = 'flex';
        buttonDiv.style.gap = '8px';
        
        const startBtn = document.createElement('button');
        startBtn.textContent = '开始滚动';
        startBtn.style.cssText = `
            flex: 1;
            padding: 6px;
            background: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        `;
        
        const stopBtn = document.createElement('button');
        stopBtn.textContent = '停止滚动';
        stopBtn.style.cssText = `
            flex: 1;
            padding: 6px;
            background: #f44336;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        `;
        stopBtn.disabled = true;
        
        startBtn.addEventListener('click', () => {
            if (!isScrolling) {
                startScrolling();
                isScrolling = true;
                startBtn.disabled = true;
                stopBtn.disabled = false;
            }
        });
        
        stopBtn.addEventListener('click', () => {
            if (isScrolling) {
                clearInterval(scrollInterval);
                isScrolling = false;
                startBtn.disabled = false;
                stopBtn.disabled = true;
            }
        });
        
        buttonDiv.append(startBtn, stopBtn);
        contentArea.appendChild(buttonDiv);

        panel.appendChild(contentArea);
        document.body.appendChild(panel);

        // 支持面板拖动
        makePanelDraggable(panel, titleBar);
    }

    // 切换最小化/展开状态
    function toggleMinimize() {
        const panel = document.getElementById('scrollControlPanel');
        const content = document.getElementById('panelContent');
        const minBtn = panel.querySelector('button');
        
        panelMinimized = !panelMinimized;
        
        if (panelMinimized) {
            // 最小化状态
            content.style.display = 'none';
            panel.style.width = 'auto';
            minBtn.textContent = '+';
        } else {
            // 展开状态
            content.style.display = 'block';
            panel.style.width = '250px';
            minBtn.textContent = '−';
        }
    }

    // 使面板可拖动
    function makePanelDraggable(panel, handle) {
        let pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
        
        handle.onmousedown = dragMouseDown;
        
        function dragMouseDown(e) {
            e = e || window.event;
            e.preventDefault();
            // 获取鼠标初始位置
            pos3 = e.clientX;
            pos4 = e.clientY;
            document.onmouseup = closeDragElement;
            // 当鼠标移动时调用elementDrag函数
            document.onmousemove = elementDrag;
        }
        
        function elementDrag(e) {
            e = e || window.event;
            e.preventDefault();
            // 计算新的位置
            pos1 = pos3 - e.clientX;
            pos2 = pos4 - e.clientY;
            pos3 = e.clientX;
            pos4 = e.clientY;
            // 设置元素新的位置
            panel.style.top = (panel.offsetTop - pos2) + "px";
            panel.style.left = (panel.offsetLeft - pos1) + "px";
            // 清除bottom和right属性，避免冲突
            panel.style.bottom = "auto";
            panel.style.right = "auto";
        }
        
        function closeDragElement() {
            // 停止移动
            document.onmouseup = null;
            document.onmousemove = null;
        }
    }

    // 更新滚动间隔（参数变化时调用）
    function updateScrollInterval() {
        clearInterval(scrollInterval);
        startScrolling();
    }

    // 滚动逻辑实现
    function startScrolling() {
        scrollInterval = setInterval(() => {
            const currentPos = window.scrollY;
            const windowHeight = window.innerHeight;
            const docHeight = Math.max(
                document.body.scrollHeight,
                document.body.offsetHeight,
                document.documentElement.scrollHeight,
                document.documentElement.offsetHeight
            );

            // 计算边界
            const atBottom = currentPos + windowHeight >= docHeight - 50;
            const atTop = currentPos <= 50;

            let newPos;

            // 根据方向计算新位置
            if (scrollDirection === 'down') {
                newPos = currentPos + scrollSpeed;
                
                // 处理底部逻辑
                if (atBottom) {
                    if (bottomJump) {
                        newPos = 0; // 跳转到顶部
                    } else {
                        scrollDirection = 'up'; // 反向滚动
                        newPos = currentPos - scrollSpeed;
                    }
                }
            } else { // 向上滚动
                newPos = currentPos - scrollSpeed;
                
                // 处理顶部逻辑
                if (atTop) {
                    if (bottomJump) {
                        newPos = docHeight - windowHeight; // 跳转到底部
                    } else {
                        scrollDirection = 'down'; // 反向滚动
                        newPos = currentPos + scrollSpeed;
                    }
                }
            }

            window.scrollTo(0, newPos);
        }, 20);
    }

    // 初始化
    createControlPanel();
})();