// ==UserScript==
// @name         MCJS 111s 卡死急救器 (极简版)
// @namespace    https://scriptcat.org/
// @version      3.2
// @description  移除所有底层干扰，专治高版本加载极慢、卡黑屏、Connecting 超时，提供一键清空缓存功能
// @author       You
// @match        *://*/*
// @grant        GM_setValue
// @grant        GM_getValue
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    // 提醒：高版本卡加载，90% 是浏览器本地数据库（IndexedDB）因为旧存档膨胀导致崩溃。
    // 请点击面板上的“清理本地存档缓存”按钮，很多时候能瞬间解决 111s 的卡死！

    function createUI() {
        if (document.getElementById('mc-rescue')) return;

        const panel = document.createElement('div');
        panel.id = 'mc-rescue';
        panel.style.cssText = `
            position: fixed; bottom: 20px; left: 20px; width: 280px;
            background: rgba(10, 15, 25, 0.95); backdrop-filter: blur(10px);
            border: 2px solid #ff3366; border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.8); z-index: 2147483647;
            color: #e0e6ed; font-family: "Segoe UI", sans-serif; font-size: 13px;
            display: flex; flex-direction: column; overflow: hidden;
            transition: opacity 0.3s;
        `;

        panel.innerHTML = `
            <style>
                #mc-rescue .header { background: rgba(255, 51, 102, 0.15); padding: 10px; font-weight: bold; color: #ff3366; text-align: center; border-bottom: 1px solid #ff3366; cursor: move; }
                #mc-rescue .content { padding: 12px; display: flex; flex-direction: column; gap: 10px; }
                #mc-rescue button { background: #ff3366; color: #fff; border: none; padding: 8px; border-radius: 6px; cursor: pointer; font-weight: bold; font-size: 13px; transition: all 0.2s; }
                #mc-rescue button:hover { filter: brightness(1.2); }
                #mc-rescue button.blue { background: #00d2ff; color: #000; }
                #mc-rescue .tips { font-size: 11px; color: #8a9bb8; line-height: 1.4; }
            </style>
            <div class="header">🚑 MCJS 加载急救器</div>
            <div class="content">
                <div class="tips">
                    <b>如果卡在 Connecting... 很久：</b><br>
                    1. 请果断按下 <b>Esc</b> 键，或点击游戏内的 <b>Cancel Task</b>，退回主菜单。<br>
                    2. 点击下方红色按钮清理缓存。<br>
                    3. 再次尝试进入。
                </div>
                <button id="clear-db-btn">🗑️ 清理浏览器本地存档缓存</button>
                <div class="tips">注意：清理会删除单机存档，但不会影响你连服务器。</div>
                
                <button id="hide-ui-btn" class="blue" style="margin-top:5px;">👁️ 隐藏此面板 (节省CPU)</button>
            </div>
        `;
        document.body.appendChild(panel);

        // 拖动
        const header = panel.querySelector('.header');
        let isDragging = false, startX, startY, initialX, initialY;
        header.addEventListener('mousedown', (e) => {
            isDragging = true;
            startX = e.clientX; startY = e.clientY;
            const rect = panel.getBoundingClientRect();
            initialX = rect.left; initialY = rect.top;
            panel.style.bottom = 'auto'; panel.style.left = initialX + 'px'; panel.style.top = initialY + 'px';
        });
        document.addEventListener('mousemove', (e) => {
            if (!isDragging) return;
            panel.style.left = `${initialX + e.clientX - startX}px`;
            panel.style.top = `${initialY + e.clientY - startY}px`;
        });
        document.addEventListener('mouseup', () => isDragging = false);

        // 隐藏面板
        panel.querySelector('#hide-ui-btn').onclick = () => {
            panel.style.opacity = '0';
            panel.style.pointerEvents = 'none';
            // 10秒后变半透明显示，免得彻底找不到了
            setTimeout(() => {
                panel.style.opacity = '0.2';
                panel.style.pointerEvents = 'auto';
            }, 10000);
        };

        // 清理 IndexedDB（极其重要）
        panel.querySelector('#clear-db-btn').onclick = async () => {
            if (!confirm("确定要清理本地游戏缓存吗？这会清除所有本地单机存档，并重置加载状态！")) return;
            
            try {
                // 清理 IndexedDB
                if (window.indexedDB && window.indexedDB.databases) {
                    const dbs = await window.indexedDB.databases();
                    for (let db of dbs) {
                        if (db.name) window.indexedDB.deleteDatabase(db.name);
                    }
                }
                
                // 清理 localStorage 和 sessionStorage 中的非设置项
                const clearStorage = (storage) => {
                    for (let i = storage.length - 1; i >= 0; i--) {
                        const key = storage.key(i);
                        // 避开脚本自身的存储
                        if (key && !key.startsWith('mc_')) {
                            storage.removeItem(key);
                        }
                    }
                };
                clearStorage(localStorage);
                clearStorage(sessionStorage);

                // 强制刷新并清除 Service Worker 缓存 (如果有的话)
                if ('serviceWorker' in navigator) {
                    const registrations = await navigator.serviceWorker.getRegistrations();
                    for (let registration of registrations) {
                        await registration.unregister();
                    }
                }
                if (window.caches) {
                    const cacheNames = await caches.keys();
                    for (let name of cacheNames) {
                        await caches.delete(name);
                    }
                }

                alert("✅ 所有本地缓存已清空！页面将重新加载。请重新选择版本进入，加载速度应该会大幅提升。");
                window.location.reload();

            } catch (e) {
                alert("清理失败，请尝试在浏览器设置中手动清理此网站的缓存。\n" + e.message);
            }
        };
    }

    // 启动逻辑
    function init() {
        const checkTimer = setInterval(() => {
            if (document.querySelector('canvas')) {
                createUI();
                clearInterval(checkTimer);
            }
        }, 1000);
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }

})();