// ==UserScript==
// @name         必应去广告+粒子消散特效+跟随系统主题
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  清除必应广告，删除时粒子消散动画，自动跟随系统深色浅色
// @author       You
// @match        https://*.bing.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // ===================== 1. 跟随系统明暗主题 =====================
    function setBingTheme(isDark) {
        const theme = isDark ? 'dark' : 'light';
        localStorage.setItem('BingTheme', theme);
        document.documentElement.setAttribute('data-theme', theme);
        window.dispatchEvent(new StorageEvent('storage', {
            key: 'BingTheme',
            newValue: theme
        }));
    }
    function syncSystemTheme() {
        const mql = window.matchMedia('(prefers-color-scheme: dark)');
        setBingTheme(mql.matches);
    }
    if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', syncSystemTheme);
    else syncSystemTheme();
    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => setBingTheme(e.matches));


    // ===================== 2. 粒子消散特效核心 =====================
    function createParticleEffect(el) {
        const rect = el.getBoundingClientRect();
        const centerX = rect.left + rect.width / 2;
        const centerY = rect.top + rect.height / 2;
        const particleCount = 60;
        const particles = [];

        // 创建容器
        const canvas = document.createElement('canvas');
        const ctx = canvas.getContext('2d');
        canvas.style.position = 'fixed';
        canvas.style.pointerEvents = 'none';
        canvas.style.zIndex = '999999';
        canvas.style.left = '0';
        canvas.style.top = '0';
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        document.body.appendChild(canvas);

        // 粒子类
        class Particle {
            constructor() {
                this.x = centerX;
                this.y = centerY;
                const angle = Math.random() * Math.PI * 2;
                const speed = Math.random() * 4 + 2;
                this.vx = Math.cos(angle) * speed;
                this.vy = Math.sin(angle) * speed;
                this.radius = Math.random() * 3 + 1;
                this.alpha = 1;
                this.decay = Math.random() * 0.015 + 0.008;
            }
            update() {
                this.x += this.vx;
                this.y += this.vy;
                this.vy += 0.05;
                this.alpha -= this.decay;
            }
            draw() {
                ctx.save();
                ctx.globalAlpha = this.alpha;
                ctx.beginPath();
                ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2);
                ctx.fillStyle = '#4096ff';
                ctx.fill();
                ctx.restore();
            }
        }

        // 生成粒子
        for (let i = 0; i < particleCount; i++) particles.push(new Particle());

        // 动画循环
        function animate() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            let alive = false;
            for (let p of particles) {
                p.update();
                p.draw();
                if (p.alpha > 0) alive = true;
            }
            if (alive) requestAnimationFrame(animate);
            else canvas.remove();
        }
        animate();
    }


    // ===================== 3. 广告清除逻辑 =====================
    const adSelectors = [
        // 搜索结果广告
        '.b_ad',
        '.ads-first',
        '.b_adTop',
        '.b_adSlate',
        // 侧边广告
        '.bSidebarAd',
        '.ads-container',
        // 底部推广、商品广告
        '.bProductCarousel',
        '.bShoppingAd',
        // 信息流推广卡片
        ['.card-with-ad-label'],
        // 竞价推广标识模块
        '[data-ad]',
        '[data-bm-ad]',
        '.ad_text'
    ];

    function removeAds() {
        adSelectors.forEach(sel => {
            document.querySelectorAll(sel).forEach(ad => {
                if (!ad.dataset.removed) {
                    ad.dataset.removed = '1';
                    createParticleEffect(ad);
                    setTimeout(() => ad.remove(), 300);
                }
            });
        });
    }

    // 初次执行
    removeAds();

    // 监听动态加载内容（滚动/翻页新广告）
    const observer = new MutationObserver(muts => {
        for (let m of muts) {
            if (m.addedNodes.length) {
                removeAds();
                break;
            }
        }
    });
    observer.observe(document.body, { childList: true, subtree: true });

})();