// ==UserScript==
// @name         网页二维码强力识别 (Alt+点击)
// @namespace    http://tampermonkey.net/
// @version      2.0
// @description  按住 Alt 键点击网页上的图片即可识别二维码，完美绕过跨域限制。
// @author       knighttools
// @match        *://*/*
// @require      https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js
// @grant        GM_xmlhttpRequest
// @grant        GM_setClipboard
// @license      MIT
// @connect      *
// @downloadURL https://update.greasyfork.icu/scripts/571055/%E7%BD%91%E9%A1%B5%E4%BA%8C%E7%BB%B4%E7%A0%81%E5%BC%BA%E5%8A%9B%E8%AF%86%E5%88%AB%20%28Alt%2B%E7%82%B9%E5%87%BB%29.user.js
// @updateURL https://update.greasyfork.icu/scripts/571055/%E7%BD%91%E9%A1%B5%E4%BA%8C%E7%BB%B4%E7%A0%81%E5%BC%BA%E5%8A%9B%E8%AF%86%E5%88%AB%20%28Alt%2B%E7%82%B9%E5%87%BB%29.meta.js
// ==/UserScript==

(function() {
    'use strict';

    // 监听全局点击事件
    document.addEventListener('click', function(e) {
        // 必须按住 Alt 键，且点击的目标必须是图片
        if (e.altKey && e.target.tagName.toUpperCase() === 'IMG') {
            e.preventDefault();
            e.stopPropagation();

            const img = e.target;
            showToast('⏳ 正在解析二维码...', 'blue');

            // 尝试强制获取图片并解析 (绕过跨域)
            fetchImageAndDecode(img.src);
        }
    }, true);

    // 核心解析逻辑
    function decodeImageData(imageObj) {
        const canvas = document.createElement('canvas');
        canvas.width = imageObj.width;
        canvas.height = imageObj.height;
        const ctx = canvas.getContext('2d', { willReadFrequently: true });

        ctx.drawImage(imageObj, 0, 0, canvas.width, canvas.height);
        try {
            const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
            const code = jsQR(imageData.data, imageData.width, imageData.height);

            if (code && code.data) {
                // 识别成功，自动复制到剪贴板
                GM_setClipboard(code.data, "text");
                showToast(`✅ 识别成功并已复制到剪贴板！\n内容: ${code.data}`, 'green', 5000);
            } else {
                showToast('❌ 未在图片中发现二维码，或二维码太模糊。', 'orange');
            }
        } catch (err) {
            showToast('❌ 解析失败: ' + err.message, 'red');
        }
    }

    // 使用油猴的 GM_xmlhttpRequest 绕过跨域限制获取图片
    function fetchImageAndDecode(url) {
        GM_xmlhttpRequest({
            method: 'GET',
            url: url,
            responseType: 'blob',
            onload: function(response) {
                if (response.status === 200) {
                    const blob = response.response;
                    const blobUrl = URL.createObjectURL(blob);
                    const tempImg = new Image();
                    tempImg.onload = function() {
                        decodeImageData(tempImg);
                        URL.revokeObjectURL(blobUrl); // 清理内存
                    };
                    tempImg.src = blobUrl;
                } else {
                    showToast('❌ 图片加载失败，状态码: ' + response.status, 'red');
                }
            },
            onerror: function() {
                showToast('❌ 跨域请求被拦截或网络错误', 'red');
            }
        });
    }

    // 在屏幕顶部显示提示信息 (Toast)
    function showToast(text, color, duration = 3000) {
        // 移除旧的提示框
        const oldToast = document.getElementById('qr-toast-msg');
        if (oldToast) oldToast.remove();

        const toast = document.createElement('div');
        toast.id = 'qr-toast-msg';
        toast.innerText = text;

        // 颜色映射
        const colors = {
            'blue': '#3b82f6', 'green': '#10b981', 'orange': '#f59e0b', 'red': '#ef4444'
        };

        toast.style.cssText = `
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: ${colors[color] || '#333'};
            color: white;
            padding: 12px 20px;
            border-radius: 8px;
            font-size: 14px;
            z-index: 2147483647;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            max-width: 80%;
            word-break: break-all;
            pointer-events: none;
            transition: opacity 0.3s;
        `;

        document.body.appendChild(toast);

        // 自动消失
        setTimeout(() => {
            toast.style.opacity = '0';
            setTimeout(() => toast.remove(), 300);
        }, duration);
    }
})();