// ==UserScript==
// @name         Linuxdo Sieve | Linux.do筛选工具
// @namespace    http://tampermonkey.net/
// @version      3.0
// @description  更优雅、更强力、更智能的 Linux.do 浏览体验增强脚本
// @author       chadyi
// @match        https://linux.do/
// @icon         https://www.google.com/s2/favicons?sz=64&domain=linux.do
// @grant        GM_setValue
// @grant        GM_getValue
// @run-at       document-end
// @license      MIT
// @updateURL    https://raw.githubusercontent.com/chadyi/LinuxdoSieve/main/LinuxdoSieve.user.js
// @downloadURL  https://raw.githubusercontent.com/chadyi/LinuxdoSieve/main/LinuxdoSieve.user.js
// ==/UserScript==

(function() {
    'use strict';

    // ================= 配置区域 =================

    // 允许自动滚动的路径白名单 (首页及核心列表)
    const AUTO_SCROLL_PATHS = ['/', '/latest', '/top', '/new'];

    // 图标定义
    const SVG_CHECK = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" style="width: 12px; height: 12px; fill: currentColor; vertical-align: -1px; margin-right: 4px;"><path d="M438.6 105.4c12.5 12.5 12.5 32.8 0 45.3l-256 256c-12.5 12.5-32.8 12.5-45.3 0l-128-128c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0L160 338.7 393.4 105.4c12.5-12.5 32.8-12.5 45.3 0z"/></svg>`;
    const SVG_BAN = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" style="width: 12px; height: 12px; fill: currentColor; vertical-align: -1px; margin-right: 4px;"><path d="M256 512A256 256 0 1 0 256 0a256 256 0 1 0 0 512zM175 175c9.4-9.4 24.6-9.4 33.9 0l47 47 47-47c9.4-9.4 24.6-9.4 33.9 0s9.4 24.6 0 33.9l-47 47 47 47c9.4 9.4 9.4 24.6 0 33.9s-24.6 9.4-33.9 0l-47-47-47 47c-9.4 9.4-24.6 9.4-33.9 0s-9.4-24.6 0-33.9l47-47-47-47c-9.4-9.4-9.4-24.6 0-33.9z"/></svg>`;

    const LEVEL_CONFIG = [
        { key: 'public', label: '公开(Lv0)', check: (cls) => !/lv\d+/i.test(cls) },
        { key: 'lv1', label: 'Lv1', check: (cls) => /lv1/i.test(cls) },
        { key: 'lv2', label: 'Lv2', check: (cls) => /lv2/i.test(cls) },
        { key: 'lv3', label: 'Lv3', check: (cls) => /lv3/i.test(cls) },
    ];

    const CATEGORY_CONFIG = [
        { id: '4', name: '开发调优' },
        { id: '98', name: '国产替代' },
        { id: '14', name: '资源荟萃' },
        { id: '42', name: '文档共建' },
        { id: '10', name: '跳蚤市场' },
        { id: '27', name: '非我莫属' },
        { id: '32', name: '读书成诗' },
        { id: '46', name: '扬帆起航' },
        { id: '34', name: '前沿快讯' },
        { id: '92', name: '网络记忆' },
        { id: '36', name: '福利羊毛' },
        { id: '11', name: '搞七捻三' },
        { id: '102', name: '社区孵化' },
        { id: '2', name: '运营反馈' },
        { id: '45', name: '深海幽域' }
    ];

    const TAG_LIST = [
        "无标签", "纯水", "快问快答", "人工智能", "软件开发", 
        "夸克网盘", "病友", "ChatGPT", "树洞", "AFF", 
        "OpenAI", "影视", "百度网盘", "VPS", "职场", 
        "网络安全", "订阅节点", "抽奖", "Cursor", "游戏", 
        "动漫", "作品集", "晒年味", "Gemini", "PT", 
        "拼车", "求资源", "配置优化", "Claude", "NSFW", 
        "圆圆满满"
    ];

    const STATE_NEUTRAL = 0; 
    const STATE_INCLUDE = 1; 
    const STATE_EXCLUDE = 2; 
    const TARGET_COUNT = 20;

    // ================= 初始化 =================
    let activeLevelFilters = GM_getValue('filter_levels_v14', LEVEL_CONFIG.map(l => l.key));
    let activeCategoryFilters = GM_getValue('filter_cats_v14', CATEGORY_CONFIG.map(c => c.id));
    let tagStates = GM_getValue('filter_tags_state_v14', {});

    let statusDiv = null;
    let checkInterval = null;

    // ================= 核心筛选逻辑 =================
    function filterTopics() {
        const rows = document.querySelectorAll('.topic-list-body tr.topic-list-item');
        if (!rows.length) return 0;

        let visibleCount = 0;
        
        const isAllLevels = activeLevelFilters.length === LEVEL_CONFIG.length;
        const isAllCats = activeCategoryFilters.length === CATEGORY_CONFIG.length;

        const includeTags = [];
        const excludeTags = [];
        TAG_LIST.forEach(tag => {
            const s = tagStates[tag] || STATE_NEUTRAL;
            if (s === STATE_INCLUDE) includeTags.push(tag);
            if (s === STATE_EXCLUDE) excludeTags.push(tag);
        });

        rows.forEach(row => {
            const classListRaw = row.className;
            const classListArray = Array.from(row.classList);

            // 1. 等级
            let levelMatch = isAllLevels;
            if (!levelMatch) {
                for (let filter of LEVEL_CONFIG) {
                    if (activeLevelFilters.includes(filter.key) && filter.check(classListRaw)) {
                        levelMatch = true;
                        break;
                    }
                }
            }

            // 2. 分类
            let categoryMatch = isAllCats;
            if (levelMatch && !categoryMatch) {
                const categoryBadge = row.querySelector('.badge-category__wrapper span[data-category-id]');
                if (categoryBadge) {
                    const cid = categoryBadge.getAttribute('data-category-id');
                    const pid = categoryBadge.getAttribute('data-parent-category-id');
                    if (activeCategoryFilters.includes(cid) || (pid && activeCategoryFilters.includes(pid))) {
                        categoryMatch = true;
                    }
                } else {
                    categoryMatch = true; 
                }
            }

            // 3. 标签
            let tagMatch = true; 
            if (levelMatch && categoryMatch) {
                const rowTags = classListArray
                    .filter(cls => cls.startsWith('tag-'))
                    .map(cls => {
                        let rawTag = cls.substring(4);
                        try { return decodeURIComponent(rawTag); } catch (e) { return rawTag; }
                    });
                
                const hasNoTags = rowTags.length === 0;

                if (excludeTags.length > 0) {
                    if (hasNoTags) {
                        if (excludeTags.includes("无标签")) tagMatch = false;
                    } else {
                        if (rowTags.some(t => excludeTags.includes(t))) tagMatch = false;
                    }
                }

                if (tagMatch && includeTags.length > 0) {
                    let hit = false;
                    if (hasNoTags) {
                        if (includeTags.includes("无标签")) hit = true;
                    } else {
                        if (rowTags.some(t => includeTags.includes(t))) hit = true;
                    }
                    if (!hit) tagMatch = false;
                }
            }

            if (levelMatch && categoryMatch && tagMatch) {
                row.style.display = ''; 
                visibleCount++;
            } else {
                row.style.display = 'none';
            }
        });

        return visibleCount;
    }

    function isFooterReached() {
        const footerMessage = document.querySelector('.footer-message');
        if (footerMessage && footerMessage.offsetParent !== null) return true;
        const bottom = document.getElementById('topic-list-bottom');
        if (bottom && bottom.innerText.includes('没有更多')) return true;
        return false;
    }

    function isLoading() {
        const spinner = document.querySelector('.spinner');
        return spinner && spinner.offsetParent !== null;
    }

    function forceLoadLoop() {
        // === 1. 安全检查：只在首页/核心列表页自动滚动 ===
        const currentPath = window.location.pathname;
        const isHomePage = AUTO_SCROLL_PATHS.includes(currentPath);

        // 如果不在首页，停止一切自动滚动行为，隐藏状态栏
        if (!isHomePage) {
            updateStatus('');
            return;
        }

        // === 2. 正常的加载逻辑 ===
        const currentCount = filterTopics();
        const isAllLevels = activeLevelFilters.length === LEVEL_CONFIG.length;
        const isAllCats = activeCategoryFilters.length === CATEGORY_CONFIG.length;
        const isAllTagsNeutral = TAG_LIST.every(t => !tagStates[t]);

        if (isAllLevels && isAllCats && isAllTagsNeutral) {
            updateStatus('');
            return;
        }

        if (currentCount < TARGET_COUNT) {
            if (isFooterReached()) {
                updateStatus(`🚫 已到底部，共找到 ${currentCount} 条`);
                return;
            }

            if (isLoading()) {
                updateStatus(`⏳ 数据读取中... (当前 ${currentCount} 条)`);
            } else {
                updateStatus(`🚀 帖子不足 (${currentCount}/${TARGET_COUNT})，正在请求历史记录...`);
                window.scrollTo(0, document.body.scrollHeight - 150);
                setTimeout(() => {
                    window.scrollTo(0, document.body.scrollHeight);
                }, 100);
            }
        } else {
            updateStatus(`✅ 筛选完毕 (当前显示 ${currentCount} 条)`);
        }
    }

    function updateStatus(text) {
        if (!statusDiv) return;
        statusDiv.innerText = text;
        statusDiv.style.opacity = text ? '1' : '0'; 
        
        if (text.includes('🚀') || text.includes('⏳')) statusDiv.style.color = '#e67e22';
        else if (text.includes('🚫')) statusDiv.style.color = '#e74c3c';
        else statusDiv.style.color = '#2ecc71';
    }

    // ================= 创建 UI =================
    function createUI() {
        if (document.getElementById('topic-filter-panel-v14')) return;

        const targetContainer = document.querySelector('.list-controls') || document.querySelector('.topic-list');
        if (!targetContainer) return;

        const container = document.createElement('div');
        container.id = 'topic-filter-panel-v14';
        container.style.cssText = `
            margin-bottom: 15px;
            padding: 10px;
            background: var(--secondary);
            border: 1px solid var(--primary-low);
            border-radius: 8px;
            display: flex;
            flex-direction: column;
            gap: 6px;
            position: relative; 
        `;

        function setButtonStyle(btn, isActive, labelText, isExclude = false) {
            btn.style.backgroundColor = 'transparent'; 
            if (isExclude) {
                btn.style.color = '#dc3545';
                btn.style.borderColor = '#dc3545';
                btn.style.fontWeight = 'bold';
                btn.innerHTML = SVG_BAN + labelText;
            } else if (isActive) {
                btn.style.color = '#28a745';
                btn.style.borderColor = '#28a745';
                btn.style.fontWeight = 'bold';
                btn.innerHTML = SVG_CHECK + labelText;
            } else {
                btn.style.color = 'var(--primary)';
                btn.style.borderColor = 'var(--primary-low)';
                btn.style.fontWeight = 'normal';
                btn.innerHTML = labelText;
            }
        }

        function createBinaryGroup(titleText, items, activeList, storageKey, valueGetter, labelGetter) {
            const row = document.createElement('div');
            row.style.cssText = 'display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; border-bottom: 1px dashed var(--primary-low); padding-bottom: 4px; padding-right: 120px;';
            
            const title = document.createElement('strong');
            title.innerText = titleText;
            title.style.marginRight = '5px';
            title.style.minWidth = '60px';
            row.appendChild(title);

            const toggleBtn = document.createElement('button');
            toggleBtn.className = 'btn btn-small';
            toggleBtn.innerText = '全选/重置';
            toggleBtn.style.marginRight = '8px';
            toggleBtn.onclick = () => {
                const allValues = items.map(valueGetter);
                if (activeList.length === allValues.length) activeList.length = 0;
                else { activeList.length = 0; activeList.push(...allValues); }
                GM_setValue(storageKey, activeList);
                row.querySelectorAll('.binary-btn').forEach(btn => {
                    const val = btn.dataset.value;
                    const lbl = btn.dataset.label;
                    const isActive = activeList.includes(val);
                    setButtonStyle(btn, isActive, lbl);
                });
                filterTopics();
            };
            row.appendChild(toggleBtn);

            items.forEach(item => {
                const val = valueGetter(item);
                const lbl = labelGetter(item);
                const btn = document.createElement('div');
                btn.className = 'binary-btn';
                btn.dataset.value = val;
                btn.dataset.label = lbl;
                btn.style.cssText = 'cursor: pointer; padding: 2px 8px; border: 1px solid; border-radius: 4px; user-select: none; font-size: 12px; transition: all 0.2s; display: flex; align-items: center;';
                setButtonStyle(btn, activeList.includes(val), lbl);
                btn.onclick = () => {
                    if (activeList.includes(val)) {
                        activeList.splice(activeList.indexOf(val), 1);
                        setButtonStyle(btn, false, lbl);
                    } else {
                        activeList.push(val);
                        setButtonStyle(btn, true, lbl);
                    }
                    GM_setValue(storageKey, activeList);
                    filterTopics();
                };
                row.appendChild(btn);
            });
            return row;
        }

        function createTriStateGroup(titleText, tagItems) {
            const row = document.createElement('div');
            row.style.cssText = 'display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; padding-top: 4px;';
            
            const title = document.createElement('strong');
            title.innerText = titleText;
            title.style.marginRight = '5px';
            title.style.minWidth = '60px';
            row.appendChild(title);

            const resetBtn = document.createElement('button');
            resetBtn.className = 'btn btn-small';
            resetBtn.innerText = '重置所有';
            resetBtn.style.marginRight = '8px';
            resetBtn.onclick = () => {
                tagStates = {};
                GM_setValue('filter_tags_state_v14', tagStates);
                row.querySelectorAll('.tri-state-btn').forEach(btn => {
                    const lbl = btn.dataset.tag;
                    btn.dataset.state = STATE_NEUTRAL;
                    setButtonStyle(btn, false, lbl, false);
                });
                filterTopics();
            };
            row.appendChild(resetBtn);

            tagItems.forEach(tag => {
                const btn = document.createElement('div');
                btn.className = 'tri-state-btn';
                btn.dataset.tag = tag;
                btn.style.cssText = 'cursor: pointer; padding: 2px 8px; border: 1px solid; border-radius: 4px; user-select: none; font-size: 12px; transition: all 0.2s; display: flex; align-items: center;';
                
                const currentState = tagStates[tag] || STATE_NEUTRAL;
                btn.dataset.state = currentState;
                const isExclude = currentState === STATE_EXCLUDE;
                const isInclude = currentState === STATE_INCLUDE;
                setButtonStyle(btn, isInclude, tag, isExclude);

                btn.onclick = () => {
                    let s = parseInt(btn.dataset.state);
                    s = (s + 1) % 3;
                    btn.dataset.state = s;
                    if (s === STATE_NEUTRAL) delete tagStates[tag];
                    else tagStates[tag] = s;
                    GM_setValue('filter_tags_state_v14', tagStates);
                    setButtonStyle(btn, s === STATE_INCLUDE, tag, s === STATE_EXCLUDE);
                    filterTopics();
                };
                row.appendChild(btn);
            });
            return row;
        }

        container.appendChild(createBinaryGroup('🛡️ 等级:', LEVEL_CONFIG, activeLevelFilters, 'filter_levels_v14', i => i.key, i => i.label));
        container.appendChild(createBinaryGroup('📂 分类:', CATEGORY_CONFIG, activeCategoryFilters, 'filter_cats_v14', i => i.id, i => i.name));
        container.appendChild(createTriStateGroup('🏷️ 标签:', TAG_LIST));

        // 状态栏
        statusDiv = document.createElement('div');
        statusDiv.style.cssText = `
            position: absolute;
            top: 13px;
            right: 15px;
            font-size: 13px;
            font-weight: bold;
            color: #888;
            text-align: right;
            transition: opacity 0.3s;
            opacity: 0;
            pointer-events: none;
        `;
        container.appendChild(statusDiv);

        targetContainer.parentNode.insertBefore(container, targetContainer);
    }

    // ================= 启动逻辑 =================
    function start() {
        createUI();
        if (checkInterval) clearInterval(checkInterval);
        checkInterval = setInterval(forceLoadLoop, 1500);
    }

    let lastUrl = location.href; 
    new MutationObserver(() => {
        const url = location.href;
        if (url !== lastUrl) {
            lastUrl = url;
            setTimeout(start, 1000); 
        }
        if (!document.getElementById('topic-filter-panel-v14')) {
            start();
        }
    }).observe(document, {subtree: true, childList: true});

    setTimeout(start, 1000);

})();