// ==UserScript==
// @name         Native Image Toggler
// @namespace    http://tampermonkey.net/
// @version      0.8
// @description  通过原生 UI 控制当前页面图片的显示和隐藏，支持持久化设置
// @author       You
// @match        *://*/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_registerMenuCommand
// @grant        GM_addStyle
// @run-at       document-start
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // 配置常量
    const STORAGE_KEY_PREFIX = 'img_toggle_';
    const STYLE_ID = 'native-image-toggler-style';
    const POSITION_KEY = 'img_toggle_position_';
    const UI_VISIBLE_KEY = 'img_toggle_ui_visible_';
    const DEFAULT_POSITION = { top: 10, right: 20 };

    // 获取当前域名的设置键
    const hostname = window.location.hostname;
    const storageKey = STORAGE_KEY_PREFIX + hostname;
    const positionKey = POSITION_KEY + hostname;

    // 状态：true 表示图片显示（默认），false 表示图片隐藏
    // 默认所有网站都是显示的，除非用户手动关闭
    let isImagesVisible = GM_getValue(storageKey, true);
    let uiPosition = GM_getValue(positionKey, DEFAULT_POSITION);
    let isUIVisible = GM_getValue(UI_VISIBLE_KEY + hostname, true);
    let isUIInitialized = false; // 防止重复初始化 UI

    // CSS 样式：隐藏图片的样式
    const hideImageCSS = `
        img, image, picture, svg, canvas, video, iframe {
            opacity: 0 !important;
            visibility: hidden !important;
            pointer-events: none !important;
        }
        * {
            background-image: none !important;
        }
        /* 排除我们自己的 UI */
        #image-toggler-ui, #image-toggler-ui * {
            opacity: 1 !important;
            visibility: visible !important;
            pointer-events: auto !important;
            background-image: initial !important;
        }
    `;

    // CSS 样式：UI 控件的样式 - Windows 11 Fluent Design 风格
    const uiCSS = `
        #image-toggler-ui {
            position: fixed;
            z-index: 2147483647;
            font-family: "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
            background-color: #f3f3f3;
            color: #1a1a1a;
            padding: 5px 12px;
            border-radius: 4px;
            cursor: grab;
            user-select: none;
            border: 1px solid rgba(0,0,0,0.08);
            transition: background-color 0.1s ease, box-shadow 0.15s ease, opacity 0.2s ease;
            font-size: 12px;
            font-weight: 400;
            display: flex;
            align-items: center;
            gap: 5px;
            opacity: 0.95;
            white-space: nowrap;
        }
        #image-toggler-ui:hover {
            background-color: #e5e5e5;
            box-shadow: 0 2px 6px rgba(0,0,0,0.06);
        }
        #image-toggler-ui:active {
            background-color: #dcdcdc;
        }
        #image-toggler-ui.dragging {
            cursor: grabbing;
            transform: scale(1.02);
            box-shadow: 0 4px 12px rgba(0,0,0,0.12);
        }
        #image-toggler-icon svg {
            width: 14px;
            height: 14px;
            flex-shrink: 0;
        }
        #image-toggler-text {
            line-height: 1;
        }

        /* 切换动画 - 轻微闪烁 */
        @keyframes img-toggle-flash {
            0% { opacity: 1; }
            50% { opacity: 0.6; }
            100% { opacity: 1; }
        }
        #image-toggler-ui.toggle-animate {
            animation: img-toggle-flash 0.2s ease;
        }

        /* 暗色模式适配 */
        @media (prefers-color-scheme: dark) {
            #image-toggler-ui {
                background-color: #323232;
                color: #fff;
                border-color: rgba(255,255,255,0.08);
            }
            #image-toggler-ui:hover {
                background-color: #454545;
                box-shadow: 0 2px 6px rgba(0,0,0,0.25);
            }
            #image-toggler-ui:active {
                background-color: #505050;
            }
        }
    `;

    // 初始化
    function init() {
        // 尽早应用状态（如果需要隐藏图片）
        applyState();

        // 等待 body 加载完成后创建 UI
        if (document.body) {
            setupUI();
            applyUIState();
        } else {
            document.addEventListener('DOMContentLoaded', setupUI);
            document.addEventListener('DOMContentLoaded', applyUIState);
        }

        // 注册菜单命令作为备用
        GM_registerMenuCommand("切换图片显示/隐藏", toggleImages);
        GM_registerMenuCommand("切换控件显示/隐藏", toggleUIVisibility);

        // 添加键盘快捷键 Ctrl+Shift+I
        document.addEventListener('keydown', function(e) {
            if (e.ctrlKey && e.shiftKey && e.key === 'I') {
                e.preventDefault();
                toggleImages();
            }
        });
    }

    function setupUI() {
        // 只在顶层窗口创建 UI，避免在 iframe 中重复创建
        if (window.self !== window.top) return;

        // 防止重复创建
        if (isUIInitialized) return;
        if (document.getElementById('image-toggler-ui')) {
            isUIInitialized = true;
            return;
        }

        // 添加 UI 样式
        GM_addStyle(uiCSS);

        // 创建 UI
        createUI();
        isUIInitialized = true;
    }

    // 创建 UI 控件
    function createUI() {
        const div = document.createElement('div');
        div.id = 'image-toggler-ui';
        div.style.top = uiPosition.top + 'px';
        div.style.right = uiPosition.right + 'px';

        let isDragging = false;
        let hasDragged = false; // 用于标记是否真正发生了拖动
        let dragOffsetX = 0;
        let dragOffsetY = 0;

        div.addEventListener('mousedown', function(e) {
            if (e.button !== 0) return;
            const rect = div.getBoundingClientRect();
            dragOffsetX = e.clientX - rect.left;
            dragOffsetY = e.clientY - rect.top;
            isDragging = true;
            hasDragged = false; // 重置拖动标记
            e.preventDefault();
        });

        document.addEventListener('mousemove', function(e) {
            if (!isDragging) return;
            // 检测是否发生了实际移动
            if (!hasDragged) {
                hasDragged = true;
                div.classList.add('dragging');
            }
            const newLeft = e.clientX - dragOffsetX;
            const newTop = e.clientY - dragOffsetY;
            div.style.right = 'auto';
            div.style.left = newLeft + 'px';
            div.style.top = newTop + 'px';
        });

        document.addEventListener('mouseup', function() {
            if (!isDragging) return;
            isDragging = false;
            div.classList.remove('dragging');

            // 只在真正发生过拖动时才保存新位置
            if (hasDragged) {
                const rect = div.getBoundingClientRect();
                uiPosition = { top: rect.top, right: window.innerWidth - rect.left - rect.width };
                GM_setValue(positionKey, uiPosition);

                div.style.left = 'auto';
                div.style.right = uiPosition.right + 'px';
            }

            // 延迟重置 hasDragged
            setTimeout(() => { hasDragged = false; }, 10);
        });

        div.addEventListener('click', function(e) {
            // 如果发生过拖动，不触发切换
            if (hasDragged) {
                e.preventDefault();
                e.stopPropagation();
                return;
            }
            toggleImages();
        });

        div.title = '拖动调整位置 | 点击切换图片显隐 | Ctrl+Shift+I 快捷键切换';
        document.body.appendChild(div);
        updateUI(div);

        // 创建右上角 UI
    }

    // 更新 UI 显示
    function updateUI(element) {
        const el = element || document.getElementById('image-toggler-ui');
        if (!el) return;

        el.classList.remove('visible-mode', 'hidden-mode');

        // 眼睛图标 SVG（显示状态）
        const eyeIconSVG = `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path><circle cx="12" cy="12" r="3"></circle></svg>`;
        // 隐藏眼睛图标 SVG（隐藏状态）
        const eyeOffIconSVG = `<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17.94 17.94A10.07 10.07 0 0 1 12 20c-7 0-11-8-11-8a18.45 18.45 0 0 1 5.06-5.94M9.9 4.24A9.12 9.12 0 0 1 12 4c7 0 11 8 11 8a18.5 18.5 0 0 1-2.16 3.19m-6.72-1.07a3 3 0 1 1-4.24-4.24"></path><line x1="1" y1="1" x2="23" y2="23"></line></svg>`;

        if (isImagesVisible) {
            el.innerHTML = `<span id="image-toggler-icon">${eyeIconSVG}</span><span id="image-toggler-text">显</span>`;
            el.title = '当前：图片显示。点击隐藏图片';
        } else {
            el.innerHTML = `<span id="image-toggler-icon">${eyeOffIconSVG}</span><span id="image-toggler-text">隐</span>`;
            el.title = '当前：图片隐藏。点击显示图片';
        }

        // 切换动画
        el.classList.remove('toggle-animate');
        void el.offsetWidth;
        el.classList.add('toggle-animate');
    }

    // 切换状态
    function toggleImages() {
        isImagesVisible = !isImagesVisible;
        GM_setValue(storageKey, isImagesVisible);
        applyState();
        updateUI();
    }

    // 切换 UI 可见性
    function toggleUIVisibility() {
        isUIVisible = !isUIVisible;
        GM_setValue(UI_VISIBLE_KEY, isUIVisible);
        applyUIState();
    }

    // 应用 UI 可见性状态
    function applyUIState() {
        const ui = document.getElementById('image-toggler-ui');
        if (ui) {
            ui.style.display = isUIVisible ? 'flex' : 'none';
        }
    }

    // 应用状态（添加或移除 CSS）
    function applyState() {
        let styleEl = document.getElementById(STYLE_ID);

        // 确保 head 存在，通常在 document-start 时 head 也是存在的（除了极早的情况）
        // 如果 head 不存在，稍微延时重试
        if (!document.head) {
            setTimeout(applyState, 10);
            return;
        }

        if (!isImagesVisible) {
            // 如果需要隐藏图片，且样式元素不存在，则添加
            if (!styleEl) {
                styleEl = document.createElement('style');
                styleEl.id = STYLE_ID;
                styleEl.textContent = hideImageCSS;
                document.head.appendChild(styleEl);
            }
        } else {
            // 如果需要显示图片，且样式元素存在，则移除
            if (styleEl) {
                styleEl.remove();
            }
        }
    }

    // 启动
    init();

})();