// ==UserScript==
// @name         二维码自动解析
// @description  鼠标悬停时自动在本地解析二维码
// @namespace    http://tampermonkey.net/
// @require      https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js
// @match        *://*/*
// @grant        GM_setClipboard
// @grant        GM_openInTab
// @grant        GM_addStyle
// @run-at       document-end
// @version      1.1
// @author       Gemini
// @license      GPLv3
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // === 配置 ===
    const DELAY_MS = 500;
    const TOLERANCE = 2;

    // === 全局变量 ===
    let hoverTimer = null;
    let tooltip = null;
    let currentImg = null;

    // 坐标相关
    let lastMouseScreenX = 0;
    let lastMouseScreenY = 0;
    let lastMouseClientX = 0;
    let lastMouseClientY = 0;

    // 顶层窗口的视口偏移量 (Screen坐标 - Client坐标)
    // 用于消除浏览器地址栏、书签栏带来的坐标误差
    let topWinOffset = null;

    // 会话缓存
    const qrCache = new Map();
    const isTop = window.self === window.top;

    // === 样式注入 ===
    GM_addStyle(`
        #qr-custom-tooltip {
            position: fixed;
            z-index: 2147483647;
            background: rgba(0, 0, 0, 0.9);
            color: #fff;
            padding: 8px 12px;
            font-size: 12px;
            max-width: 320px;
            word-break: break-all;
            pointer-events: none;
            display: none;
            border: 1px solid #555;
            border-radius: 0px !important;
            box-shadow: none !important;
            line-height: 1.5;
            text-align: left;
        }
        .qr-detected-style {
            cursor: pointer !important;
            outline: none !important;
        }
    `);

    // ==========================================
    //      通信模块 (跨域支持)
    // ==========================================

    function sendToTop(type, payload = {}) {
        if (isTop) {
            handleMessage({ data: { type, payload } });
        } else {
            window.top.postMessage({ type: 'QR_SCRIPT_MSG', action: type, payload }, '*');
        }
    }

    if (isTop) {
        window.addEventListener('message', (event) => {
            if (event.data && event.data.type === 'QR_SCRIPT_MSG') {
                handleMessage({ data: { type: event.data.action, payload: event.data.payload } });
            }
        });
    }

    function handleMessage(e) {
        const { type, payload } = e.data;
        switch (type) {
            case 'SHOW_TOOLTIP':
                renderTooltip(payload.text, payload.coords, payload.isLink);
                break;
            case 'HIDE_TOOLTIP':
                hideTooltipDOM();
                break;
            case 'SHOW_FEEDBACK':
                showFeedbackDOM();
                break;
        }
    }

    // ==========================================
    //      UI 渲染模块 (仅顶层窗口)
    // ==========================================

    function getTooltip() {
        if (!tooltip) {
            tooltip = document.createElement('div');
            tooltip.id = 'qr-custom-tooltip';
            document.body.appendChild(tooltip);
        }
        return tooltip;
    }

    function renderTooltip(text, coords, isLink) {
        const tip = getTooltip();

        const contentColor = isLink ? '#4dabf7' : '#ffffff';
        const actionColor = '#4CAF50';

        tip.innerHTML = `
            <div style="color:${contentColor}; margin-bottom:6px;">${escapeHtml(text)}</div>
            <div style="color:${actionColor}; font-weight:bold; border-top:1px solid #444; padding-top:4px;">
                ${isLink ? '🔗 点击打开链接' : '📋 点击复制文本'}
            </div>
        `;

        tip.style.display = 'block';

        // --- 核心坐标修复逻辑 ---

        // 1. 获取顶层窗口的偏移量 (ScreenY - ClientY)
        // 如果有精确校准值(topWinOffset)则使用 否则使用估算值
        let offsetY, offsetX;

        if (topWinOffset) {
            // 精确模式：鼠标在顶层移动过 我们知道确切的 UI 高度
            offsetX = topWinOffset.x;
            offsetY = topWinOffset.y;
        } else {
            // 估算模式：鼠标只在 iframe 动过
            // 估算 UI 高度 = 窗口外高度 - 视口高度
            // 这通常能修正 95% 的误差 避免出现"几百像素"的偏差
            const winScreenX = window.screenX !== undefined ? window.screenX : window.screenLeft;
            const winScreenY = window.screenY !== undefined ? window.screenY : window.screenTop;

            // 假设左侧边框/滚动条宽度
            offsetX = winScreenX + (window.outerWidth - window.innerWidth);
            // 假设顶部 UI 高度 (地址栏等)
            offsetY = winScreenY + (window.outerHeight - window.innerHeight);
        }

        // 2. 计算 CSS 坐标
        // 元素屏幕坐标 - 视口起始屏幕坐标 = 元素视口内坐标
        let left = coords.absLeft - offsetX;
        let top = coords.absBottom - offsetY + 10; // 默认底部 + 10px

        // 3. 边界检测与翻转
        const tipRect = tip.getBoundingClientRect();
        const winHeight = window.innerHeight;
        const winWidth = window.innerWidth;

        // 垂直翻转：如果底部空间不足 移到上方
        if (top + tipRect.height > winHeight) {
            // 图片顶部屏幕坐标 - 视口起始Y - 提示框高度 - 间距
            top = (coords.absTop - offsetY) - tipRect.height - 10;
        }

        // 水平限制
        if (left + tipRect.width > winWidth) left = winWidth - tipRect.width - 10;
        if (left < 0) left = 10;

        tip.style.top = top + 'px';
        tip.style.left = left + 'px';
    }

    function hideTooltipDOM() {
        if (tooltip) tooltip.style.display = 'none';
    }

    function showFeedbackDOM() {
        const tip = getTooltip();
        if (tip.style.display === 'none') return;

        const originalHTML = tip.innerHTML;
        tip.innerHTML = `<div style="font-size:14px; text-align:center; color:#4dabf7; font-weight:bold;">✅ 已复制到剪贴板</div>`;

        setTimeout(() => {
            if (tip.style.display !== 'none') {
                tip.innerHTML = originalHTML;
            }
        }, 1000);
    }

    // ==========================================
    //      逻辑处理模块 (所有 Frame)
    // ==========================================

    function requestShowTooltip(text, imgElement) {
        if (currentImg === imgElement) return;
        currentImg = imgElement;

        const isLink = isUrl(text);
        const rect = imgElement.getBoundingClientRect();

        // 计算当前 Frame 的偏移 (鼠标屏幕坐标 - 鼠标 Client 坐标)
        // 如果没有鼠标数据 降级为 0
        const frameOffsetX = (lastMouseScreenX && lastMouseClientX) ? (lastMouseScreenX - lastMouseClientX) : 0;
        const frameOffsetY = (lastMouseScreenY && lastMouseClientY) ? (lastMouseScreenY - lastMouseClientY) : 0;

        // 计算图片的绝对屏幕坐标
        const coords = {
            absLeft: rect.left + frameOffsetX,
            absTop: rect.top + frameOffsetY,
            absBottom: rect.bottom + frameOffsetY
        };

        sendToTop('SHOW_TOOLTIP', { text, coords, isLink });
    }

    function requestHideTooltip() {
        currentImg = null;
        sendToTop('HIDE_TOOLTIP');
    }

    function requestFeedback() {
        sendToTop('SHOW_FEEDBACK');
    }

    function scanQR(img, force = false) {
        const src = img.src;
        if (!force && qrCache.has(src)) return;

        const canvas = document.createElement('canvas');
        const context = canvas.getContext('2d');
        const tempImg = new Image();
        tempImg.crossOrigin = "Anonymous";
        tempImg.src = src;

        tempImg.onload = () => {
            canvas.width = tempImg.width;
            canvas.height = tempImg.height;
            context.drawImage(tempImg, 0, 0, tempImg.width, tempImg.height);
            try {
                const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
                const code = jsQR(imageData.data, imageData.width, imageData.height);
                if (code) {
                    qrCache.set(src, code.data);
                    applyQrSuccess(img, code.data);
                    if (force) console.log('[QR] 强制解析成功');
                } else {
                    qrCache.set(src, null);
                    if (force) console.log('[QR] 强制解析失败: 未发现二维码');
                }
            } catch (e) {
                qrCache.set(src, null);
            }
        };
        tempImg.onerror = () => { qrCache.set(src, null); };
    }

    function applyQrSuccess(img, text) {
        img.dataset.hasQr = "true";
        img.classList.add('qr-detected-style');
        // 如果是强制解析（通常鼠标在图片上） 或者鼠标悬停中 则显示
        requestShowTooltip(text, img);
    }

    function isUrl(text) { return /^https?:\/\//i.test(text); }
    function escapeHtml(text) {
        return text.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#039;");
    }

    // ==========================================
    //      事件监听
    // ==========================================

    // 鼠标移动监听：用于实时校准坐标
    document.addEventListener('mousemove', (e) => {
        // 记录当前 Frame 的鼠标数据
        lastMouseScreenX = e.screenX;
        lastMouseScreenY = e.screenY;
        lastMouseClientX = e.clientX;
        lastMouseClientY = e.clientY;

        // 如果是顶层窗口 记录精确的视口偏移量 (这是最准确的校准源)
        if (isTop) {
            topWinOffset = {
                x: e.screenX - e.clientX,
                y: e.screenY - e.clientY
            };
        }
    }, true);

    document.addEventListener('mouseover', (e) => {
        const target = e.target;
        if (target.tagName !== 'IMG' || !target.complete || target.naturalWidth === 0) return;

        const src = target.src;
        if (!src) return;

        if (qrCache.has(src)) {
            const cachedData = qrCache.get(src);
            if (cachedData) {
                if (!target.dataset.hasQr) {
                    target.dataset.hasQr = "true";
                    target.classList.add('qr-detected-style');
                }
                requestShowTooltip(cachedData, target);
            }
            return;
        }

        const w = target.naturalWidth;
        const h = target.naturalHeight;
        if (Math.abs(w - h) > TOLERANCE || w < 30) {
            qrCache.set(src, null);
            return;
        }

        hoverTimer = setTimeout(() => {
            if (!qrCache.has(src)) {
                scanQR(target);
            }
        }, DELAY_MS);
    });

    document.addEventListener('mouseout', (e) => {
        if (e.target.tagName === 'IMG') {
            clearTimeout(hoverTimer);
            if (currentImg === e.target) {
                requestHideTooltip();
            }
        }
    });

    document.addEventListener('click', (e) => {
        const target = e.target;
        if (target.tagName === 'IMG' && target.dataset.hasQr === "true") {
            const src = target.src;
            const data = qrCache.get(src);

            if (data) {
                e.preventDefault();
                e.stopPropagation();

                if (isUrl(data)) {
                    GM_openInTab(data, { active: true, insert: true });
                } else {
                    GM_setClipboard(data);
                    requestFeedback();
                }
            }
        }
    }, true);

    // === 新增：双击强制解析 ===
    document.addEventListener('dblclick', (e) => {
        const target = e.target;
        if (target.tagName !== 'IMG' || !target.src) return;

        // 如果已经识别成功 双击不做处理（避免与单击冲突 或者重复触发）
        if (target.dataset.hasQr === "true") return;

        // 阻止默认双击行为（如选中图片）
        e.preventDefault();
        e.stopPropagation();

        // 强制解析：传入 true 忽略缓存和比例限制
        scanQR(target, true);
    }, true);

})();