// ==UserScript==
// @name         元素层级网页截图工具
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  网页内容元素级选择，可以进行编辑 | 支持窗口拖动 | 截图不包含工具自身
// @author       wilsend
// @match        *://*/*
// @grant        GM_registerMenuCommand
// @require      https://html2canvas.hertzen.com/dist/html2canvas.min.js
// ==/UserScript==

(function() {
    'use strict';

    // 全局变量存储UI元素引用
    let uiContainer = null;
    let closeButton = null;
    let elementInput = null;
    let inputConfirmBtn = null;
    // 编辑窗口相关变量
    let editWindow = null;
    let editContentContainer = null;
    let removeElemBtn = null;
    let saveEditBtn = null;
    let cancelEditBtn = null;
    let isEditing = false;
    let isRemovingElem = false;
    let editHighlight = null;
    // 存储编辑时的元素副本和原始元素
    let editedElementClone = null;
    let originalSelectedElement = null;
    // 存储页面原始样式表（用于保留样式）
    let originalStylesheets = [];
    // 拖动相关变量
    let isDragging = false;
    let dragOffsetX = 0;
    let dragOffsetY = 0;
    let hasDragged = false;

    // 创建操作界面元素
    function createUI() {
        if (document.getElementById('element-screenshot-tool')) {
            uiContainer = document.getElementById('element-screenshot-tool');
            closeButton = uiContainer.querySelector('#close-btn');
            elementInput = uiContainer.querySelector('#element-input');
            inputConfirmBtn = uiContainer.querySelector('#input-confirm-btn');
            return uiContainer;
        }

        // 主容器（添加忽略截图属性）
        const container = document.createElement('div');
        container.id = 'element-screenshot-tool';
        container.setAttribute('data-html2canvas-ignore', 'true'); // 核心：截图忽略
        container.style.cssText = `
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 999999;
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.2);
            max-width: 300px;
            font-family: Arial, sans-serif;
            cursor: move;
            user-select: none;
        `;

        // 标题
        const title = document.createElement('h3');
        title.textContent = '任意元素截图工具';
        title.style.marginTop = '0';
        title.style.color = '#333';

        // 状态显示
        const status = document.createElement('div');
        status.id = 'screenshot-status';
        status.textContent = '请选择一个操作';
        status.style.padding = '8px 0';
        status.style.color = '#666';
        status.style.fontSize = '14px';

        // 手动输入元素区域
        const inputArea = document.createElement('div');
        inputArea.style.cssText = 'margin: 10px 0; display: flex; gap: 8px;';
        
        const inputLabel = document.createElement('label');
        inputLabel.textContent = '手动输入元素：';
        inputLabel.style.fontSize = '12px';
        inputLabel.style.alignSelf = 'center';

        elementInput = document.createElement('input');
        elementInput.id = 'element-input';
        elementInput.type = 'text';
        elementInput.placeholder = '标签名或#ID（例：div、#header）';
        elementInput.style.flex = '1';
        elementInput.style.padding = '6px';
        elementInput.style.border = '1px solid #ddd';
        elementInput.style.borderRadius = '4px';
        elementInput.style.fontSize = '12px';
        elementInput.style.cursor = 'text';

        inputConfirmBtn = document.createElement('button');
        inputConfirmBtn.id = 'input-confirm-btn';
        inputConfirmBtn.textContent = '确认';
        inputConfirmBtn.style.padding = '6px 12px';
        inputConfirmBtn.style.backgroundColor = '#4285f4';
        inputConfirmBtn.style.color = 'white';
        inputConfirmBtn.style.border = 'none';
        inputConfirmBtn.style.borderRadius = '4px';
        inputConfirmBtn.style.cursor = 'pointer';
        inputConfirmBtn.style.fontSize = '12px';

        inputArea.appendChild(inputLabel);
        inputArea.appendChild(elementInput);
        inputArea.appendChild(inputConfirmBtn);

        // 操作提示
        const hint = document.createElement('div');
        hint.style.cssText = `
            font-size: 12px;
            color: #888;
            margin: 10px 0;
            padding: 5px;
            background: #f5f5f4;
            border-radius: 4px;
        `;
        hint.innerHTML = '操作提示：<br>[ 扩大选择（父级）<br>] 缩小选择（子级）<br>回车/点击确认 | ESC取消';

        // 按钮容器
        const buttonContainer = document.createElement('div');
        buttonContainer.style.display = 'flex';
        buttonContainer.style.gap = '8px';
        buttonContainer.style.marginBottom = '10px';

        const selectButton = document.createElement('button');
        selectButton.textContent = '鼠标选择元素';
        selectButton.style.flex = '1';
        selectButton.style.padding = '8px';
        selectButton.style.backgroundColor = '#4285f4';
        selectButton.style.color = 'white';
        selectButton.style.border = 'none';
        selectButton.style.borderRadius = '4px';
        selectButton.style.cursor = 'pointer';
        selectButton.id = 'select-element-button';

        const editButton = document.createElement('button');
        editButton.textContent = '编辑元素';
        editButton.id = 'edit-element-button';
        editButton.style.flex = '1';
        editButton.style.padding = '8px';
        editButton.style.backgroundColor = '#fbbc05';
        editButton.style.color = 'white';
        editButton.style.border = 'none';
        editButton.style.borderRadius = '4px';
        editButton.style.cursor = 'pointer';
        editButton.disabled = true;

        const captureButton = document.createElement('button');
        captureButton.textContent = '保存截图';
        captureButton.id = 'capture-button';
        captureButton.style.flex = '1';
        captureButton.style.padding = '8px';
        captureButton.style.backgroundColor = '#34a853';
        captureButton.style.color = 'white';
        captureButton.style.border = 'none';
        captureButton.style.borderRadius = '4px';
        captureButton.style.cursor = 'pointer';
        captureButton.disabled = true;

        // 已选元素信息
        const selectedInfo = document.createElement('div');
        selectedInfo.id = 'selected-element-info';
        selectedInfo.style.margin = '10px 0';
        selectedInfo.style.padding = '8px';
        selectedInfo.style.border = '1px dashed #ddd';
        selectedInfo.style.borderRadius = '4px';
        selectedInfo.style.fontSize = '12px';
        selectedInfo.style.color = '#666';
        selectedInfo.textContent = '未选择任何元素';

        // 关闭按钮
        const closeBtn = document.createElement('button');
        closeBtn.id = 'close-btn';
        closeBtn.textContent = '关闭';
        closeBtn.style.width = '100%';
        closeBtn.style.padding = '8px';
        closeBtn.style.backgroundColor = '#ea4335';
        closeBtn.style.color = 'white';
        closeBtn.style.border = 'none';
        closeBtn.style.borderRadius = '4px';
        closeBtn.style.cursor = 'pointer';

        // 组装界面
        buttonContainer.appendChild(selectButton);
        buttonContainer.appendChild(editButton);
        buttonContainer.appendChild(captureButton);
        container.appendChild(title);
        container.appendChild(status);
        container.appendChild(inputArea);
        container.appendChild(hint);
        container.appendChild(buttonContainer);
        container.appendChild(selectedInfo);
        container.appendChild(closeBtn);
        document.body.appendChild(container);

        // 更新全局引用
        uiContainer = container;
        closeButton = closeBtn;

        // 绑定拖动事件
        bindDragEvents();

        return container;
    }

    // 绑定窗口拖动事件
    function bindDragEvents() {
        const container = uiContainer;
        
        container.addEventListener('mousedown', (e) => {
            if (e.target.tagName === 'BUTTON' || e.target.tagName === 'INPUT') return;
            isDragging = true;
            hasDragged = false;
            dragOffsetX = e.clientX - container.getBoundingClientRect().left;
            dragOffsetY = e.clientY - container.getBoundingClientRect().top;
            container.style.opacity = '0.8';
        });

        document.addEventListener('mousemove', (e) => {
            if (!isDragging) return;
            hasDragged = true;
            const left = e.clientX - dragOffsetX;
            const top = e.clientY - dragOffsetY;
            container.style.left = `${left}px`;
            container.style.top = `${top}px`;
            container.style.right = 'auto';
        });

        document.addEventListener('mouseup', (e) => {
            if (isDragging) {
                isDragging = false;
                container.style.opacity = '1';
                if (hasDragged) {
                    e.preventDefault();
                    e.stopPropagation();
                }
            }
        });
    }

    // 创建全屏编辑窗口
    function createEditWindow() {
        if (editWindow) return editWindow;

        editWindow = document.createElement('div');
        editWindow.id = 'edit-element-window';
        editWindow.setAttribute('data-html2canvas-ignore', 'true'); // 截图忽略
        editWindow.style.cssText = `
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: white;
            z-index: 9999999;
            overflow: auto;
            display: none;
        `;

        const editToolbar = document.createElement('div');
        editToolbar.style.cssText = `
            position: sticky;
            top: 0;
            background: #333;
            padding: 12px 20px;
            display: flex;
            gap: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
            z-index: 10;
        `;

        removeElemBtn = document.createElement('button');
        removeElemBtn.textContent = '移除元素';
        removeElemBtn.style.padding = '8px 16px';
        removeElemBtn.style.backgroundColor = '#ea4335';
        removeElemBtn.style.color = 'white';
        removeElemBtn.style.border = 'none';
        removeElemBtn.style.borderRadius = '4px';
        removeElemBtn.style.cursor = 'pointer';

        const removeHint = document.createElement('span');
        removeHint.id = 'remove-mode-hint';
        removeHint.textContent = '';
        removeHint.style.color = 'white';
        removeHint.style.marginLeft = '10px';
        removeHint.style.alignSelf = 'center';
        removeHint.style.fontSize = '14px';

        saveEditBtn = document.createElement('button');
        saveEditBtn.textContent = '保存编辑并截图';
        saveEditBtn.style.padding = '8px 16px';
        saveEditBtn.style.backgroundColor = '#34a853';
        saveEditBtn.style.color = 'white';
        saveEditBtn.style.border = 'none';
        saveEditBtn.style.borderRadius = '4px';
        saveEditBtn.style.cursor = 'pointer';

        cancelEditBtn = document.createElement('button');
        cancelEditBtn.textContent = '取消编辑';
        cancelEditBtn.style.padding = '8px 16px';
        cancelEditBtn.style.backgroundColor = '#999';
        cancelEditBtn.style.color = 'white';
        cancelEditBtn.style.border = 'none';
        cancelEditBtn.style.borderRadius = '4px';
        cancelEditBtn.style.cursor = 'pointer';

        editContentContainer = document.createElement('div');
        editContentContainer.id = 'edit-content-container';
        editContentContainer.style.cssText = `
            padding: 0;
            margin: 0;
        `;

        editHighlight = document.createElement('div');
        editHighlight.id = 'edit-element-highlight';
        editHighlight.setAttribute('data-html2canvas-ignore', 'true'); // 截图忽略
        editHighlight.style.cssText = `
            position: absolute;
            background: rgba(234, 67, 53, 0.3);
            border: 2px solid #ea4335;
            pointer-events: none;
            z-index: 99999999;
            display: none;
        `;
        document.body.appendChild(editHighlight);

        editToolbar.appendChild(removeElemBtn);
        editToolbar.appendChild(removeHint);
        editToolbar.appendChild(saveEditBtn);
        editToolbar.appendChild(cancelEditBtn);
        editWindow.appendChild(editToolbar);
        editWindow.appendChild(editContentContainer);
        document.body.appendChild(editWindow);

        bindEditEvents();
        return editWindow;
    }

    // 绑定编辑窗口相关事件
    function bindEditEvents() {
        removeElemBtn.addEventListener('click', toggleRemoveMode);
        saveEditBtn.addEventListener('click', () => {
            if (editedElementClone) {
                captureAndSave(editedElementClone);
                closeEditWindow();
            }
        });
        cancelEditBtn.addEventListener('click', closeEditWindow);
        document.addEventListener('keydown', handleEditKeyDown);
    }

    // 切换移除元素模式
    function toggleRemoveMode() {
        isRemovingElem = !isRemovingElem;
        const removeHint = document.getElementById('remove-mode-hint');
        if (isRemovingElem) {
            removeElemBtn.style.backgroundColor = '#ff6b6b';
            removeHint.textContent = '移除模式：鼠标选择元素点击删除（ESC退出）';
            editContentContainer.addEventListener('mousemove', handleEditMouseMove);
            editContentContainer.addEventListener('click', handleEditElementClick);
        } else {
            removeElemBtn.style.backgroundColor = '#ea4335';
            removeHint.textContent = '';
            editContentContainer.removeEventListener('mousemove', handleEditMouseMove);
            editContentContainer.removeEventListener('click', handleEditElementClick);
            editHighlight.style.display = 'none';
        }
    }

    // 编辑窗口键盘事件处理
    function handleEditKeyDown(e) {
        if (!isEditing) return;
        if (e.key === 'Escape') {
            if (isRemovingElem) {
                isRemovingElem = false;
                const removeHint = document.getElementById('remove-mode-hint');
                removeElemBtn.style.backgroundColor = '#ea4335';
                removeHint.textContent = '';
                editContentContainer.removeEventListener('mousemove', handleEditMouseMove);
                editContentContainer.removeEventListener('click', handleEditElementClick);
                editHighlight.style.display = 'none';
            } else {
                closeEditWindow();
            }
        }
    }

    // 保存页面原始样式表
    function saveOriginalStylesheets() {
        originalStylesheets = [];
        Array.from(document.styleSheets).forEach(stylesheet => {
            try {
                if (stylesheet.href) {
                    originalStylesheets.push(stylesheet.href);
                } else {
                    const rules = Array.from(stylesheet.cssRules).map(rule => rule.cssText).join('\n');
                    originalStylesheets.push({ type: 'inline', content: rules });
                }
            } catch (e) {
                console.log('无法访问样式表:', e);
            }
        });
    }

    // 在编辑窗口中恢复样式表
    function restoreStylesInEditWindow() {
        const styleContainer = document.createElement('div');
        styleContainer.id = 'original-styles-container';
        originalStylesheets.forEach(style => {
            if (typeof style === 'string') {
                const link = document.createElement('link');
                link.rel = 'stylesheet';
                link.href = style;
                link.crossOrigin = 'anonymous';
                styleContainer.appendChild(link);
            } else if (style.type === 'inline') {
                const styleElem = document.createElement('style');
                styleElem.textContent = style.content;
                styleContainer.appendChild(styleElem);
            }
        });
        if (editContentContainer.firstChild) {
            editContentContainer.insertBefore(styleContainer, editContentContainer.firstChild);
        } else {
            editContentContainer.appendChild(styleContainer);
        }
    }

    // 显示编辑窗口
    function showEditWindow(targetElement) {
        createEditWindow();
        originalSelectedElement = targetElement;
        saveOriginalStylesheets();
        editedElementClone = targetElement.cloneNode(true);
        const computedStyle = window.getComputedStyle(targetElement);
        editedElementClone.style.width = computedStyle.width;
        editedElementClone.style.minWidth = computedStyle.minWidth;
        editedElementClone.style.maxWidth = computedStyle.maxWidth;
        editedElementClone.style.margin = computedStyle.margin;
        editedElementClone.style.padding = computedStyle.padding;
        editContentContainer.innerHTML = '';
        editContentContainer.appendChild(editedElementClone);
        restoreStylesInEditWindow();
        editWindow.style.display = 'block';
        isEditing = true;
    }

    // 关闭编辑窗口
    function closeEditWindow() {
        if (editWindow) editWindow.style.display = 'none';
        isEditing = false;
        isRemovingElem = false;
        if (removeElemBtn) removeElemBtn.style.backgroundColor = '#ea4335';
        if (editHighlight) editHighlight.style.display = 'none';
        if (document.getElementById('remove-mode-hint')) document.getElementById('remove-mode-hint').textContent = '';
        if (editContentContainer) {
            editContentContainer.removeEventListener('mousemove', handleEditMouseMove);
            editContentContainer.removeEventListener('click', handleEditElementClick);
        }
    }

    // 编辑时鼠标移动高亮元素
    function handleEditMouseMove(e) {
        if (!isRemovingElem) return;
        if (e.target.closest('#edit-element-window > div:first-child')) return;
        const targetElem = e.target;
        const rect = targetElem.getBoundingClientRect();
        editHighlight.style.top = `${rect.top}px`;
        editHighlight.style.left = `${rect.left}px`;
        editHighlight.style.width = `${rect.width}px`;
        editHighlight.style.height = `${rect.height}px`;
        editHighlight.style.display = 'block';
    }

    // 编辑时点击移除元素
    function handleEditElementClick(e) {
        if (!isRemovingElem) return;
        if (e.target.closest('#edit-element-window > div:first-child')) return;
        const targetElem = e.target;
        if (confirm('确定要移除这个元素吗？')) targetElem.remove();
        editHighlight.style.display = 'none';
    }

    // 创建遮罩层
    function createOverlay() {
        if (document.getElementById('screenshot-overlay')) return document.getElementById('screenshot-overlay');
        const overlay = document.createElement('div');
        overlay.id = 'screenshot-overlay';
        overlay.setAttribute('data-html2canvas-ignore', 'true'); // 截图忽略
        overlay.style.cssText = `
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.7);
            z-index: 999997;
            display: none;
            pointer-events: none;
        `;
        const hintContainer = document.createElement('div');
        hintContainer.style.cssText = `
            position: absolute;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            pointer-events: auto;
        `;
        const hint = document.createElement('div');
        hint.style.cssText = `
            color: white;
            font-size: 16px;
            padding: 10px 20px;
            background: rgba(0,0,0,0.5);
            border-radius: 4px;
        `;
        hint.textContent = '[ 扩大选择 | ] 缩小选择 | 回车/点击确认 | ESC取消';
        hintContainer.appendChild(hint);
        overlay.appendChild(hintContainer);
        document.body.appendChild(overlay);
        return overlay;
    }

    // 显示/隐藏遮罩层
    function toggleOverlay(show) {
        const overlay = createOverlay();
        overlay.style.display = show ? 'block' : 'none';
    }

    // 显示操作界面
    function showUI() {
        const ui = createUI();
        ui.style.display = 'block';
        bindEvents();
    }

    // 隐藏操作界面
    function hideUI() {
        if (uiContainer) uiContainer.style.display = 'none';
    }

    // 根据输入内容查找元素
    function findElementByInput(inputVal) {
        if (!inputVal.trim()) return null;
        if (inputVal.startsWith('#')) return document.getElementById(inputVal.slice(1));
        return document.querySelector(inputVal);
    }

    // 手动输入元素确认后的处理
    function handleInputConfirm() {
        const inputVal = elementInput.value.trim();
        const status = document.getElementById('screenshot-status');
        const info = document.getElementById('selected-element-info');
        const captureBtn = document.getElementById('capture-button');
        const editBtn = document.getElementById('edit-element-button');
        const targetElement = findElementByInput(inputVal);
        if (targetElement) {
            selectedElement = targetElement;
            const elementInfo = targetElement.id ? `${targetElement.tagName.toLowerCase()}#${targetElement.id}` : targetElement.tagName.toLowerCase();
            status.textContent = `已选中输入元素: <${elementInfo}>`;
            status.style.color = '#333';
            info.textContent = `已选择: <${elementInfo}>`;
            info.style.color = '#34a853';
            info.style.borderColor = '#34a853';
            captureBtn.disabled = false;
            editBtn.disabled = false;
            updateHighlight(targetElement);
        } else {
            status.textContent = '未找到该元素，请检查输入格式';
            status.style.color = '#ea4335';
            info.textContent = '未选择任何元素';
            info.style.color = '#666';
            info.style.borderColor = '#ddd';
            captureBtn.disabled = true;
            editBtn.disabled = true;
            selectedElement = null;
            updateHighlight(null);
        }
    }

    // 变量存储
    let selectedElement = null;
    let isSelecting = false;
    let highlightOverlay = null;
    let elementHistory = [];
    let historyIndex = -1;

    // 创建高亮覆盖层
    function createHighlightOverlay() {
        if (highlightOverlay) return highlightOverlay;
        highlightOverlay = document.createElement('div');
        highlightOverlay.id = 'screenshot-highlight';
        highlightOverlay.setAttribute('data-html2canvas-ignore', 'true'); // 截图忽略
        highlightOverlay.style.cssText = `
            position: absolute;
            background: rgba(66, 133, 244, 0.3);
            border: 2px solid #4285f4;
            pointer-events: none;
            z-index: 999998;
            display: none;
            transition: all 0.1s ease;
        `;
        document.body.appendChild(highlightOverlay);
        return highlightOverlay;
    }

    // 更新高亮显示
    function updateHighlight(element) {
        if (!element) {
            if (highlightOverlay) highlightOverlay.style.display = 'none';
            return;
        }
        const rect = element.getBoundingClientRect();
        const overlay = createHighlightOverlay();
        overlay.style.top = `${rect.top + window.scrollY}px`;
        overlay.style.left = `${rect.left + window.scrollX}px`;
        overlay.style.width = `${rect.width}px`;
        overlay.style.height = `${rect.height}px`;
        overlay.style.display = 'block';
        overlay.style.transform = 'scale(1)';
        setTimeout(() => overlay.style.transform = 'scale(1.01)', 50);
        setTimeout(() => overlay.style.transform = 'scale(1)', 100);
        const status = document.getElementById('screenshot-status');
        const elementInfo = element.id ? `${element.tagName.toLowerCase()}#${element.id}` : element.tagName.toLowerCase();
        status.textContent = `已选择: <${elementInfo}>`;
    }

    // 过滤工具自身元素
    function isToolElement(element) {
        return element.id && (element.id.startsWith('element-screenshot-') || element.id.startsWith('screenshot-') || element.id.startsWith('edit-'));
    }

    // 获取元素的所有父级元素
    function getParentElements(element) {
        const parents = [];
        let current = element.parentElement;
        while (current) {
            if (!isToolElement(current)) parents.push(current);
            current = current.parentElement;
        }
        return parents;
    }

    // 获取元素的直接子级元素
    function getChildElements(element) {
        return Array.from(element.children).filter(child => !isToolElement(child));
    }

    // 向上选择父级元素
    function selectParentElement() {
        if (!selectedElement) return;
        const parents = getParentElements(selectedElement);
        if (parents.length > 0) {
            if (historyIndex === elementHistory.length - 1) elementHistory.push(selectedElement);
            historyIndex++;
            selectedElement = parents[0];
            updateHighlight(selectedElement);
        }
    }

    // 向下选择子级元素
    function selectChildElement() {
        if (!selectedElement) return;
        const children = getChildElements(selectedElement);
        if (children.length > 0) {
            if (historyIndex === elementHistory.length - 1) elementHistory.push(selectedElement);
            historyIndex++;
            selectedElement = children[0];
            updateHighlight(selectedElement);
        }
    }

    // 开始选择元素
    function startSelecting() {
        if (isSelecting) return;
        isSelecting = true;
        selectedElement = null;
        elementHistory = [];
        historyIndex = -1;
        const status = document.getElementById('screenshot-status');
        status.textContent = '移动鼠标选择初始元素（回车确认）...';
        status.style.color = '#4285f4';
        toggleOverlay(true);
        document.body.style.cursor = 'crosshair';
        document.getElementById('select-element-button').disabled = true;
        document.addEventListener('mousemove', handleMouseMove);
        document.addEventListener('click', handleMouseClick);
        document.addEventListener('keydown', handleKeyDown);
    }

    // 结束选择元素
    function stopSelecting(confirmed = false) {
        isSelecting = false;
        toggleOverlay(false);
        document.body.style.cursor = '';
        document.getElementById('select-element-button').disabled = false;
        document.removeEventListener('mousemove', handleMouseMove);
        document.removeEventListener('click', handleMouseClick);
        document.removeEventListener('keydown', handleKeyDown);
        if (highlightOverlay) highlightOverlay.style.display = 'none';
        elementHistory = [];
        historyIndex = -1;
        const status = document.getElementById('screenshot-status');
        const info = document.getElementById('selected-element-info');
        const captureBtn = document.getElementById('capture-button');
        const editBtn = document.getElementById('edit-element-button');
        if (confirmed && selectedElement) {
            status.textContent = '已选择元素，可编辑或直接截图';
            status.style.color = '#333';
            const elementInfo = selectedElement.id ? `${selectedElement.tagName.toLowerCase()}#${selectedElement.id}` : selectedElement.tagName.toLowerCase();
            info.textContent = `已选择: <${elementInfo}>`;
            info.style.color = '#34a853';
            info.style.borderColor = '#34a853';
            captureBtn.disabled = false;
            editBtn.disabled = false;
        } else {
            status.textContent = '选择已取消';
            status.style.color = '#ea4335';
            info.textContent = '未选择任何元素';
            info.style.color = '#666';
            info.style.borderColor = '#ddd';
            captureBtn.disabled = true;
            editBtn.disabled = true;
            selectedElement = null;
        }
    }

    // 处理鼠标移动
    function handleMouseMove(e) {
        if (!isSelecting) return;
        const elements = document.elementsFromPoint(e.clientX, e.clientY);
        const targetElement = elements.find(el => !isToolElement(el));
        if (targetElement) {
            if (!selectedElement || targetElement !== selectedElement) {
                selectedElement = targetElement;
                elementHistory = [];
                historyIndex = -1;
                updateHighlight(targetElement);
            }
        } else {
            updateHighlight(null);
            selectedElement = null;
            elementHistory = [];
            historyIndex = -1;
        }
    }

    // 处理鼠标点击
    function handleMouseClick(e) {
        if (!isSelecting) return;
        e.stopPropagation();
        e.preventDefault();
        if (selectedElement) stopSelecting(true);
    }

    // 处理键盘事件
    function handleKeyDown(e) {
        if (!isSelecting) {
            if (document.activeElement === elementInput && e.key === 'Enter') {
                e.preventDefault();
                handleInputConfirm();
            }
            return;
        }
        if (e.key === 'Escape') {
            stopSelecting(false);
            return;
        }
        if (e.key === 'Enter') {
            e.preventDefault();
            if (selectedElement) stopSelecting(true);
            return;
        }
        if (e.key === '[') {
            e.preventDefault();
            selectParentElement();
            return;
        }
        if (e.key === ']') {
            e.preventDefault();
            selectChildElement();
            return;
        }
    }

    // 捕获并保存截图（核心：排除工具自身元素）
    function captureAndSave(targetElem = null) {
        const captureTarget = targetElem || selectedElement;
        if (!captureTarget) return;
        const status = document.getElementById('screenshot-status');
        status.textContent = '正在生成截图...';
        status.style.color = '#fbbc05';

        html2canvas(captureTarget, {
            scale: window.devicePixelRatio || 1,
            useCORS: true,
            logging: false,
            allowTaint: false,
            backgroundColor: null,
            // 双重保险：忽略工具自身ID
            ignoreElements: (el) => {
                return el.id && (
                    el.id === 'element-screenshot-tool' ||
                    el.id === 'screenshot-overlay' ||
                    el.id === 'screenshot-highlight' ||
                    el.id === 'edit-element-window' ||
                    el.id === 'edit-element-highlight'
                );
            }
        }).then(canvas => {
            const elementName = captureTarget.tagName.toLowerCase();
            const fileName = targetElem ? `${elementName}-edited-screenshot-${new Date().getTime()}.png` : `${elementName}-screenshot-${new Date().getTime()}.png`;
            const link = document.createElement('a');
            link.download = fileName;
            link.href = canvas.toDataURL('image/png');
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
            status.textContent = '截图已保存!';
            status.style.color = '#34a853';
        }).catch(error => {
            console.error('截图失败:', error);
            status.textContent = '截图失败，请重试';
            status.style.color = '#ea4335';
        });
    }

    // 绑定事件
    function bindEvents() {
        if (closeButton) closeButton.removeEventListener('click', handleClose);
        if (inputConfirmBtn) inputConfirmBtn.removeEventListener('click', handleInputConfirm);
        const selectBtn = document.getElementById('select-element-button');
        const captureBtn = document.getElementById('capture-button');
        const editBtn = document.getElementById('edit-element-button');
        if (selectBtn) {
            selectBtn.removeEventListener('click', startSelecting);
            selectBtn.addEventListener('click', startSelecting);
        }
        if (captureBtn) {
            captureBtn.removeEventListener('click', () => captureAndSave());
            captureBtn.addEventListener('click', () => captureAndSave());
        }
        if (editBtn) {
            editBtn.removeEventListener('click', () => {
                if (selectedElement) showEditWindow(selectedElement);
            });
            editBtn.addEventListener('click', () => {
                if (selectedElement) showEditWindow(selectedElement);
            });
        }
        if (closeButton) closeButton.addEventListener('click', handleClose);
        if (inputConfirmBtn) inputConfirmBtn.addEventListener('click', handleInputConfirm);
        elementInput.removeEventListener('keydown', inputEnterHandler);
        elementInput.addEventListener('keydown', inputEnterHandler);
    }

    // 输入框回车辅助处理函数
    function inputEnterHandler(e) {
        if (e.key === 'Enter') {
            e.preventDefault();
            handleInputConfirm();
        }
    }

    // 关闭按钮处理函数
    function handleClose() {
        if (isSelecting) stopSelecting(false);
        if (isEditing) closeEditWindow();
        hideUI();
    }

    // 注册油猴菜单命令
    GM_registerMenuCommand('点击截图', showUI);

    // 初始化界面（默认隐藏）
    createUI();
    hideUI();
})();