// ==UserScript==
// @name        Emoji Tooltip
// @name:zh-CN  Emoji 含义选中提示
// @namespace   http://tampermonkey.net/
// @version     1.11
// @description:zh-CN 在网页中选中 Emoji 时，强制以 PNG 格式图片显示其高清图标及名称和分类，支持所有带肤色变体的 Emoji。
// @description When an emoji is selected on a webpage, it forces the display of its high-resolution icon, name, and category as a PNG image, supporting all emojis with skin tone variations.
// @author      Kaesinol
// @match       *://*/*
// @grant       GM_xmlhttpRequest
// @grant       GM_getValue
// @grant       GM_setValue
// @connect     cdn.jsdelivr.net
// @connect     www.emojiall.com
// @run-at      document-start
// @license     MIT
// @downloadURL none
// ==/UserScript==   

(function () {
    'use strict';

    // ====================
    // ⚙️ Configuration
    // ====================
    const CONFIG = {
        BASE_URL: 'https://cdn.jsdelivr.net/npm/emojibase-data@17.0.0',
        PNG_BASE_URL: 'https://www.emojiall.com/images/60/google',
        CACHE_KEY: 'emoji_tooltip_data_v5',
        CACHE_VERSION: '1.11',
        AUTO_HIDE_DELAY: 10000,
        MOUSE_MOVE_THRESHOLD: 300,
        GROUP_MAP: {
            0: 'Smileys & Emotion', 1: 'People & Body', 2: 'Component',
            3: 'Animals & Nature', 4: 'Food & Drink', 5: 'Travel & Places',
            6: 'Activities', 7: 'Objects', 8: 'Symbols', 9: 'Flags'
        }
    };

    // ====================
    // 📦 State Variables
    // ====================
    let emojiMap = new Map();
    let tooltipElement;
    let hideTimer, autoHideTimer;
    let isTooltipVisible = false;
    let lastMousePosition = { x: 0, y: 0 };


    // ====================
    // 🎨 Tooltip UI Logic
    // ====================

    /** 初始化 Tooltip 元素并注入到 DOM */
    function initTooltipElement() {
        tooltipElement = document.createElement('div');
        tooltipElement.style.cssText = `
            position: fixed; background: #2b2b2b; color: #fff; padding: 10px 14px;
            border-radius: 8px; box-shadow: 0 4px 20px rgba(0,0,0,0.4);
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            font-size: 14px; line-height: 1.4; z-index: 2147483647; max-width: 320px;
            opacity: 0; transition: opacity 0.2s, transform 0.2s; display: none;
            transform: translateX(10px) translateY(5px); pointer-events: none;
            border: 1px solid #444;
        `;

        if (document.body) {
            document.body.appendChild(tooltipElement);
        } else {
            // document-start 运行，可能 body 还没准备好，使用 MutationObserver
            new MutationObserver((mutations, observer) => {
                if (document.body) {
                    document.body.appendChild(tooltipElement);
                    observer.disconnect();
                }
            }).observe(document.documentElement, { childList: true, subtree: true });
        }
    }

    /** 显示 Tooltip */
    function showTooltip(content, x, y) {
        clearTimeout(hideTimer);
        clearTimeout(autoHideTimer);

        tooltipElement.innerHTML = content;
        tooltipElement.style.display = 'block';
        tooltipElement.style.opacity = '0';
        tooltipElement.style.transform = 'translateX(10px) translateY(5px)';
        void tooltipElement.offsetWidth;

        const viewportWidth = window.innerWidth;
        const viewportHeight = window.innerHeight;
        const tooltipWidth = tooltipElement.clientWidth || 200;
        const tooltipHeight = tooltipElement.clientHeight || 80;

        let left = x + 15;
        let top = y + 15;

        if (left + tooltipWidth > viewportWidth - 10) left = x - tooltipWidth - 15;
        if (top + tooltipHeight > viewportHeight - 10) top = y - tooltipHeight - 15;

        tooltipElement.style.left = `${left}px`;
        tooltipElement.style.top = `${top}px`;

        requestAnimationFrame(() => {
            tooltipElement.style.opacity = '1';
            tooltipElement.style.transform = 'translateX(0) translateY(0)';
        });

        isTooltipVisible = true;
        autoHideTimer = setTimeout(hideTooltip, CONFIG.AUTO_HIDE_DELAY);
    }

    /** 隐藏 Tooltip */
    function hideTooltip() {
        if (!isTooltipVisible) return;
        clearTimeout(hideTimer);
        clearTimeout(autoHideTimer);
        tooltipElement.style.opacity = '0';
        tooltipElement.style.transform = 'translateX(10px) translateY(5px)';
        hideTimer = setTimeout(() => {
            tooltipElement.style.display = 'none';
            isTooltipVisible = false;
        }, 200);
    }

    /** 显示数据加载中的提示Tooltip */
    function showLoadingTooltip(x, y) {
        const content = `
            <div style="display: flex; align-items: center; gap: 12px">
                <div style="font-weight: 600; font-size: 14px; color: #f9e67d;">
                    ✨ Loading Emoji Data...
                </div>
                <div style="color: #bbb; font-size: 12px;">
                    (Please wait a moment)
                </div>
            </div>
        `;
        showTooltip(content, x, y);
        lastMousePosition = { x, y };
    }


    // ====================
    // 🧠 Event Handling
    // ====================

    /** 鼠标松开（选中）事件处理 */
    function handleSelection(e) {
        let selection;
        try {
             selection = window.getSelection().toString().trim();
        } catch (error) {
            hideTooltip();
            return;
        }

        if (!selection || selection.length < 1 || selection.length > 15) {
            if (isTooltipVisible) hideTimer = setTimeout(hideTooltip, 2000);
            return;
        }

        const emojiData = emojiMap.get(selection);

        if (emojiData) {
            // 1. 数据已加载且匹配：显示 Emoji 详情
            showEmojiTooltip(emojiData, selection, e.clientX, e.clientY);
        } else if (emojiMap.size === 0) {
            // 2. 数据未加载（Map为空）：显示加载提示
            showLoadingTooltip(e.clientX, e.clientY);
        } else {
            // 3. 数据已加载但未匹配：隐藏 Tooltip
            if (isTooltipVisible) hideTooltip();
        }
    }

    /** 构建 Tooltip 内容并显示 */
    function showEmojiTooltip(emojiData, emojiChar, x, y) {
        const name = emojiData.name.charAt(0).toUpperCase() + emojiData.name.slice(1);
        const pngUrl = `${CONFIG.PNG_BASE_URL}/${emojiData.hexcode.toLowerCase()}.png`;

        const iconHtml = `<img src="${pngUrl}" alt="${emojiChar}" style="width: 32px; height: 32px; vertical-align: middle; object-fit: contain;">`;

        const content = `
            <div style="display: flex; align-items: center; gap: 12px">
                ${iconHtml}
                <div>
                    <div style="font-weight: 600; line-height: 1.3; font-size: 14px;">${name}</div>
                    <div style="color: #bbb; font-size: 12px; margin-top: 3px;">
                        Group: ${emojiData.group}
                    </div>
                </div>
            </div>
        `;
        showTooltip(content, x, y);
        lastMousePosition = { x, y };
    }

    /** 鼠标大幅度移动事件处理 (用于自动隐藏) */
    function handleMouseMove(e) {
        if (!isTooltipVisible) return;
        const dx = Math.abs(e.clientX - lastMousePosition.x);
        const dy = Math.abs(e.clientY - lastMousePosition.y);
        if (dx > CONFIG.MOUSE_MOVE_THRESHOLD || dy > CONFIG.MOUSE_MOVE_THRESHOLD) {
            hideTooltip();
            lastMousePosition = { x: e.clientX, y: e.clientY };
        }
    }


    // ====================
    // 💾 Data & Cache Logic
    // ====================

    /**
     * 处理原始数据并保存到 emojiMap 和 GM_setValue。
     */
    function processAndCacheData(data, langCode, origin) {
        try {
            emojiMap.clear();

            data.forEach(item => {
                if (item.emoji && item.label && item.hexcode) {
                    emojiMap.set(item.emoji, {
                        name: item.label,
                        group: CONFIG.GROUP_MAP[item.group] || 'Other',
                        hexcode: item.hexcode
                    });
                }
                if (Array.isArray(item.skins)) {
                    item.skins.forEach(skin => {
                        if (skin.emoji && skin.label && skin.hexcode) {
                            emojiMap.set(skin.emoji, {
                                name: skin.label,
                                group: CONFIG.GROUP_MAP[skin.group || item.group] || 'Other',
                                hexcode: skin.hexcode
                            });
                        }
                    });
                }
            });

            if (origin === 'network') {
                GM_setValue(CONFIG.CACHE_KEY, {
                    version: CONFIG.CACHE_VERSION,
                    lang: langCode,
                    timestamp: Date.now(),
                    data: data
                });
            }

            console.log(`[Emoji Tooltip] ${emojiMap.size} emojis loaded (${langCode}) from ${origin}.`);

        } catch (e) {
            console.error('[Emoji Tooltip] Failed to process data', e);
        }
    }

    /** 从网络获取 Emoji 数据 */
    function fetchEmojiData(langCode, isFallback = false) {
        const url = `${CONFIG.BASE_URL}/${langCode}/data.json`;

        GM_xmlhttpRequest({
            method: 'GET',
            url: url,
            onload: function (response) {
                if (response.status === 200) {
                    processAndCacheData(JSON.parse(response.responseText), langCode, 'network');
                } else if (!isFallback && langCode !== 'en') {
                    console.warn(`[Emoji Tooltip] Failed to load ${langCode}. Falling back to English (en).`);
                    fetchEmojiData('en', true);
                }
            },
            onerror: function (error) {
                console.error(`[Emoji Tooltip] Network error loading ${langCode}:`, error);
                if (!isFallback && langCode !== 'en') {
                    fetchEmojiData('en', true);
                }
            }
        });
    }

    /** 加载或获取 Emoji 数据 */
    function loadEmojiData() {
        const browserLang = (navigator.language || 'en').split('-')[0];
        const cached = GM_getValue(CONFIG.CACHE_KEY, null);

        if (cached && cached.version === CONFIG.CACHE_VERSION) {
            if (cached.lang === browserLang || cached.lang === 'en') {
                try {
                    processAndCacheData(cached.data, cached.lang, 'cache');
                    return;
                } catch (e) {
                    console.error('[Emoji Tooltip] Cached data corrupted, forcing network reload.');
                    GM_setValue(CONFIG.CACHE_KEY, null);
                }
            }
        }

        fetchEmojiData(browserLang);
    }


    // ====================
    // 启动程序
    // ====================
    function init() {
        initTooltipElement(); // 确保 UI 元素立即创建
        loadEmojiData();      // 开始异步加载数据

        // 绑定事件，Tooltip 已经就绪，可以接收用户的选中操作
        document.addEventListener('mouseup', handleSelection, { passive: true });
        document.addEventListener('mousemove', handleMouseMove, { passive: true });
        window.addEventListener('scroll', hideTooltip, { passive: true });
        window.addEventListener('blur', hideTooltip);
        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape' && isTooltipVisible) {
                hideTooltip();
            }
        });
    }

    init();
})();