// ==UserScript==
// @name         Via Css隐藏规则日志
// @namespace    https://viayoo.com/
// @version      2.3.8
// @license      MIT
// @description  检测哪些Css在Via上规则生效，并输出匹配日志。
// @author       Copilot & Grok
// @run-at       document-start
// @match        *://*/*
// @grant        GM_registerMenuCommand
// @grant        GM_setValue
// @grant        GM_getValue
// ==/UserScript==

(function() {
    'use strict';

    const BUTTON_STORAGE = {
        ENABLED: 'floatingButtonEnabled',
        LEFT: 'floatingButtonLeft',
        TOP: 'floatingButtonTop'
    };
    const CSS_FILE_PATH = '/via_inject_blocker.css';
    const LONG_PRESS_THRESHOLD = 500;

    const createStyledElement = (tag, styles, text) => {
        const el = document.createElement(tag);
        Object.assign(el.style, styles);
        if (text) el.textContent = text;
        return el;
    };

    const splitSelectors = cssText => {
        const selectors = [];
        let current = '';
        let bracketDepth = 0;
        let parenDepth = 0;
        let inQuote = false;
        let quoteChar = null;

        for (let i = 0; i < cssText.length; i++) {
            const char = cssText[i];

            if (inQuote) {
                current += char;
                if (char === quoteChar) inQuote = false;
                continue;
            }

            if (char === '"' || char === "'") {
                inQuote = true;
                quoteChar = char;
                current += char;
                continue;
            }

            if (char === '[') bracketDepth++;
            if (char === ']') bracketDepth--;
            if (char === '(') parenDepth++;
            if (char === ')') parenDepth--;
            if (char === '{' && bracketDepth === 0 && parenDepth === 0 && !inQuote) {
                if (current.trim()) selectors.push(current.trim());
                break;
            }
            if (char === ',' && bracketDepth === 0 && parenDepth === 0 && !inQuote) {
                if (current.trim()) selectors.push(current.trim());
                current = '';
            } else {
                current += char;
            }
        }

        if (current.trim()) selectors.push(current.trim());
        return selectors;
    };

    const checkActiveSelectors = cssText => {
        const selectors = splitSelectors(cssText);
        const activeRules = [];

        selectors.forEach(selector => {
            try {
                const elements = document.querySelectorAll(selector);
                if (elements.length) {
                    activeRules.push({
                        selector: selector.trim(),
                        count: elements.length
                    });
                }
            } catch (e) {
                console.warn(`[Via CSS Logger] 无效选择器: ${selector}, 错误: ${e.message}`);
            }
        });

        return activeRules;
    };

    const checkCssFile = async () => {
        const cssUrl = `https://${window.location.hostname}${CSS_FILE_PATH}`;
        try {
            const response = await fetch(cssUrl);
            if (!response.ok) throw new Error(`状态码: ${response.status}`);

            const rawCss = await response.text();
            if (!rawCss.trim()) throw new Error('CSS文件为空');

            const checkRules = () => {
                const activeRules = checkActiveSelectors(rawCss);

                const messageLines = activeRules.length ? [
                    `🎉 检测完成！共 ${activeRules.length} 条规则生效：`,
                    '--------------------------------',
                    ...activeRules.map((r, i) =>
                        `${i + 1}. 规则: ${window.location.hostname}##${r.selector}\n   匹配数: ${r.count}\n`
                    ),
                    '--------------------------------'
                ] : ['⚠️ 没有发现生效的CSS规则！'];
                const fullMessage = messageLines.join('\n');
                console.log(fullMessage);
                alert(fullMessage.slice(0, 1000) + (fullMessage.length > 1000 ? '\n\nℹ️ 日志过长，请查看控制台以获取完整信息' : ''));
            };

            if (document.readyState === 'complete') {
                checkRules();
            } else {
                window.addEventListener('load', checkRules, {
                    once: true
                });
            }
        } catch (e) {
            console.error(`[Via CSS Logger] CSS检查失败：${e.message}`);
            alert(`❌ 检查CSS文件失败：${e.message}\nURL: ${cssUrl}`);
        }
    };

    const createFloatingButton = () => {
        if (window.self !== window.top) return;

        const button = createStyledElement('div', {
            position: 'fixed',
            zIndex: '10000',
            width: '70px',
            height: '35px',
            backgroundColor: '#2d89ef',
            color: 'white',
            borderRadius: '5px',
            textAlign: 'center',
            lineHeight: '35px',
            fontSize: '14px',
            boxShadow: '0 4px 6px rgba(0,0,0,0.1)',
            cursor: 'pointer',
            opacity: '0.9',
            transition: 'opacity 0.3s, transform 0.3s',
            touchAction: 'none'
        }, 'CSS日志');

        const defaultLeft = window.innerWidth - 100;
        const defaultTop = window.innerHeight - 100;
        button.style.left = `${GM_getValue(BUTTON_STORAGE.LEFT, defaultLeft)}px`;
        button.style.top = `${GM_getValue(BUTTON_STORAGE.TOP, defaultTop)}px`;

        document.body.appendChild(button);

        let isDragging = false,
            startX, startY, startLeft, startTop, touchStartTime;

        button.addEventListener('touchstart', e => {
            e.preventDefault();
            touchStartTime = Date.now();
            isDragging = false;
            const touch = e.touches[0];
            startX = touch.clientX;
            startY = touch.clientY;
            startLeft = parseInt(button.style.left) || 0;
            startTop = parseInt(button.style.top) || 0;
        });

        button.addEventListener('touchmove', e => {
            e.preventDefault();
            const touch = e.touches[0];
            const deltaX = touch.clientX - startX;
            const deltaY = touch.clientY - startY;

            if (Date.now() - touchStartTime >= LONG_PRESS_THRESHOLD) {
                isDragging = true;
                const newLeft = startLeft + deltaX;
                const newTop = startTop + deltaY;
                const rect = button.getBoundingClientRect();
                button.style.left = `${Math.max(0, Math.min(newLeft, window.innerWidth - rect.width))}px`;
                button.style.top = `${Math.max(0, Math.min(newTop, window.innerHeight - rect.height))}px`;
            }
        });

        button.addEventListener('touchend', e => {
            e.preventDefault();
            const touchDuration = Date.now() - touchStartTime;

            if (isDragging && touchDuration >= LONG_PRESS_THRESHOLD) {
                const rect = button.getBoundingClientRect();
                const newLeft = rect.left + rect.width / 2 < window.innerWidth / 2 ? 0 : window.innerWidth - rect.width;
                button.style.left = `${newLeft}px`;
                GM_setValue(BUTTON_STORAGE.LEFT, newLeft);
                GM_setValue(BUTTON_STORAGE.TOP, parseInt(button.style.top));
            } else if (touchDuration < LONG_PRESS_THRESHOLD) {
                checkCssFile();
            }
        });

        return button;
    };

    const ensureButtonExists = () => {
        if (!document.querySelector("div[style*='CSS日志']")) {
            createFloatingButton();
        }
    };

    const resetButtonPosition = () => {
        const defaultLeft = window.innerWidth - 100;
        const defaultTop = window.innerHeight - 100;
        GM_setValue(BUTTON_STORAGE.LEFT, defaultLeft);
        GM_setValue(BUTTON_STORAGE.TOP, defaultTop);

        const button = document.querySelector("div[style*='CSS日志']");
        if (button) {
            button.style.left = `${defaultLeft}px`;
            button.style.top = `${defaultTop}px`;
        }
        alert('✅ 悬浮按钮位置已重置至默认位置！');
    };

    const init = () => {
        const isButtonEnabled = GM_getValue(BUTTON_STORAGE.ENABLED, false);

        GM_registerMenuCommand(
            isButtonEnabled ? '关闭悬浮按钮' : '开启悬浮按钮',
            () => {
                GM_setValue(BUTTON_STORAGE.ENABLED, !isButtonEnabled);
                alert(`✅ 悬浮按钮已${isButtonEnabled ? '关闭' : '开启'}！`);
                location.reload();
            }
        );

        GM_registerMenuCommand('检测CSS隐藏规则', checkCssFile);
        GM_registerMenuCommand('重置悬浮按钮位置', resetButtonPosition);

        if (isButtonEnabled) {
            document.readyState === 'loading' ?
                document.addEventListener('DOMContentLoaded', ensureButtonExists) :
                ensureButtonExists();
        }
    };

    init();
})();