// ==UserScript==
// @name         多模式护眼助手
// @version      5.0
// @description  脚本菜单支持多种护眼模式切换，背景与链接颜色配套，支持自定义域名禁用。
// @author       Gemini
// @run-at       document-start
// @match        *://*/*
// @grant        GM_registerMenuCommand
// @grant        GM_setValue
// @grant        GM_getValue
// @namespace https://greasyfork.org/users/452911
// @downloadURL https://update.greasyfork.icu/scripts/460539/%E5%A4%9A%E6%A8%A1%E5%BC%8F%E6%8A%A4%E7%9C%BC%E5%8A%A9%E6%89%8B.user.js
// @updateURL https://update.greasyfork.icu/scripts/460539/%E5%A4%9A%E6%A8%A1%E5%BC%8F%E6%8A%A4%E7%9C%BC%E5%8A%A9%E6%89%8B.meta.js
// ==/UserScript==

(function() {
    'use strict';

    // 1. 配置中心：颜色配套方案
    const THEMES = {
        'default':   { name: '豆沙绿', bg: '#C7EDCC', link: '#2E7D32' },
        'parchment': { name: '羊皮纸', bg: '#F4ECD8', link: '#8B4513' },
        'pink':      { name: '樱花粉', bg: '#FDE2E4', link: '#C2185B' },
        'cyan':      { name: '青草蓝', bg: '#DCEFF0', link: '#006064' },
        'warm':      { name: '暖阳黄', bg: '#FAF9DE', link: '#E65100' }
    };

    let currentMode = GM_getValue('currentMode', 'default');
    const currentDomain = window.location.hostname;
    let disabledDomains = GM_getValue('disabledDomains', []);
    let isDisabled = disabledDomains.includes(currentDomain);

    // 2. 注入动态 CSS 变量控制中心
    const styleEl = document.createElement('style');
    styleEl.id = 'eye-protector-core-style';
    // 在 head 还没加载出来时，注入到 documentElement
    (document.head || document.documentElement).appendChild(styleEl);

    function updateCSSVars(modeKey) {
        if (isDisabled) {
            styleEl.textContent = '';
            return;
        }
        const theme = THEMES[modeKey] || THEMES.default;
        styleEl.textContent = `
            :root {
                --eye-bg: ${theme.bg} !important;
                --eye-link: ${theme.link} !important;
            }
            /* 只有被打上标记的元素才会变色 */
            [data-eye-bg="true"] { background-color: var(--eye-bg) !important; background-image: none !important; }
            [data-eye-link="true"] { color: var(--eye-link) !important; text-decoration: none !important; }
        `;
    }

    // 3. 元素扫描与标记引擎
    function scanAndTag() {
        if (isDisabled) return;

        // 获取所有尚未被本脚本扫描过的元素
        const elements = document.querySelectorAll('*:not([data-eye-scanned])');
        
        elements.forEach(el => {
            el.setAttribute('data-eye-scanned', 'true');

            // A. 排除项：视频、图片、画板、图标
            if (el.matches('video, img, canvas, svg, [class*="player"], .icon, .fa')) return;

            // B. 链接处理
            if (el.tagName === 'A') {
                el.setAttribute('data-eye-link', 'true');
            }

            // C. 背景处理：针对原脚本提到的特殊 ID 和 类名 进行强制覆盖
            if (el.matches('DIV#gb-main, DIV.url.clearfix, DIV.nav-bar-v2-fixed, DIV.se-page-hd-content')) {
                el.setAttribute('data-eye-bg', 'true');
                return;
            }

            // D. 智能背景判定：如果是浅色背景，则标记
            const style = window.getComputedStyle(el);
            const bgColor = style.backgroundColor;
            const rgb = bgColor.match(/\d+/g);
            
            if (rgb && rgb.length >= 3) {
                const [r, g, b] = rgb.map(Number);
                // 判定阈值：RGB 均大于 220 通常为白色或近白色背景
                if (r > 220 && g > 220 && b > 220) {
                    el.setAttribute('data-eye-bg', 'true');
                }
            }
        });
    }

    // 4. 注册脚本菜单
    function initMenus() {
        // 开关切换
        GM_registerMenuCommand(isDisabled ? "🟢 开启当前网站护眼" : "🔴 禁用当前网站护眼", () => {
            if (isDisabled) {
                disabledDomains = disabledDomains.filter(d => d !== currentDomain);
            } else {
                disabledDomains.push(currentDomain);
            }
            GM_setValue('disabledDomains', disabledDomains);
            location.reload(); // 涉及域名白名单，建议刷新以重置所有样式
        });

        // 颜色模式切换（无需刷新）
        Object.keys(THEMES).forEach(key => {
            GM_registerMenuCommand("🎨 模式：" + THEMES[key].name, () => {
                currentMode = key;
                GM_setValue('currentMode', key);
                updateCSSVars(key);
                console.log(`已切换至: ${THEMES[key].name}`);
            });
        });
    }

    // 5. 启动逻辑
    updateCSSVars(currentMode);
    initMenus();

    // 持续监听：处理动态加载、瀑布流、弹窗等新元素
    const observer = new MutationObserver(() => {
        scanAndTag();
    });

    // 监听文档变化
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            observer.observe(document.body, { childList: true, subtree: true });
            scanAndTag();
        });
    } else {
        observer.observe(document.body, { childList: true, subtree: true });
        scanAndTag();
    }

    // 兜底：处理某些特殊加载情况
    window.addEventListener('load', scanAndTag);

})();