// ==UserScript==
// @name         公众号封面一键提取
// @version      1.4
// @description  点击悬浮按钮提取微信公众号文章高清封面，支持复制/下载/打开（下载文件名=文章标题）
// @author       柒儿smile
// @include      *://mp.weixin.qq.com/s*
// @match        *://mp.weixin.qq.com/s*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // 提取封面原图链接
    function getCoverImageUrl() {
        const meta = document.querySelector('meta[property="og:image"]');
        if (!meta || !meta.content) return null;
        return meta.content.replace(/\/\d+$/, '/0');
    }

    // 获取文章标题（去除公众号后缀）
    function getArticleTitle() {
        const titleEl = document.querySelector('.rich_media_title') ||
                        document.querySelector('h1') ||
                        document.querySelector('title');
        if (!titleEl) return '公众号封面';
        let title = titleEl.textContent.trim()
            // 移除常见后缀
            .replace(/\s*[-|｜]\s*微信公众号.*$/, '')
            .replace(/\s*[-|｜]\s*微信公众平台.*$/, '');
        // 过滤非法字符
        title = title.replace(/[\\/:*?"<>|]/g, '_')
                     .replace(/\s+/g, ' ')
                     .trim();
        return title.substring(0, 80) || '公众号封面';
    }

    // 复制到剪贴板
    async function copyToClipboard(text) {
        try {
            await navigator.clipboard.writeText(text);
            return true;
        } catch {
            const textarea = document.createElement('textarea');
            textarea.value = text;
            textarea.style.position = 'fixed';
            textarea.style.opacity = '0';
            document.body.appendChild(textarea);
            textarea.select();
            const success = document.execCommand('copy');
            document.body.removeChild(textarea);
            return success;
        }
    }

    // Toast 提示
    function showToast(message, type = 'info') {
        const toast = document.createElement('div');
        toast.textContent = message;
        Object.assign(toast.style, {
            position: 'fixed',
            top: '20px',
            left: '50%',
            transform: 'translateX(-50%)',
            background: type === 'error' ? 'rgba(245, 34, 45, 0.9)' : 'rgba(0,0,0,0.7)',
            color: 'white',
            padding: '10px 24px',
            borderRadius: '24px',
            fontSize: '14px',
            lineHeight: '1.4',
            zIndex: '9999999',
            backdropFilter: 'blur(10px)',
            whiteSpace: 'nowrap',
            animation: 'coverToastFadeIn 0.3s ease',
            pointerEvents: 'none'
        });
        document.body.appendChild(toast);
        setTimeout(() => {
            toast.style.opacity = '0';
            toast.style.transition = 'opacity 0.3s';
            setTimeout(() => toast.remove(), 300);
        }, 1600);
    }

    // 下载图片（格式智能识别）
    async function downloadImage(url, fileName) {
        try {
            let ext = '';
            const fmtMatch = url.match(/wx_fmt=(\w+)/);
            if (fmtMatch) {
                ext = fmtMatch[1].toLowerCase();
                if (ext === 'jpeg') ext = 'jpg';
            } else {
                const path = url.split('?')[0];
                const lastSegment = path.split('/').pop();
                if (lastSegment) {
                    const dotIndex = lastSegment.lastIndexOf('.');
                    if (dotIndex > -1) {
                        const candidate = lastSegment.substring(dotIndex + 1).toLowerCase();
                        if (/^(jpg|jpeg|png|gif|webp|bmp)$/.test(candidate)) {
                            ext = candidate;
                        }
                    }
                }
            }
            if (!ext) ext = 'jpg';

            const safeName = fileName.replace(/[\\/:*?"<>|]/g, '_').trim().substring(0, 80) || '公众号封面';
            const response = await fetch(url);
            if (!response.ok) throw new Error('Network error');
            const blob = await response.blob();
            const blobUrl = URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = blobUrl;
            a.download = `${safeName}.${ext}`;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            setTimeout(() => URL.revokeObjectURL(blobUrl), 1000);
            return true;
        } catch (e) {
            window.open(url, '_blank');
            return false;
        }
    }

    // 弹窗
    function showResultModal(coverUrl) {
        const oldModal = document.getElementById('cover-extractor-modal');
        if (oldModal) oldModal.remove();

        const modal = document.createElement('div');
        modal.id = 'cover-extractor-modal';
        modal.innerHTML = `
            <div class="cover-modal-backdrop">
                <div class="cover-modal-card">
                    <button class="cover-modal-close-btn" id="close-btn-top">✕</button>
                    <div class="cover-modal-header">
                        <span class="cover-modal-icon">🖼️</span>
                        <h3 class="cover-modal-title">封面提取成功</h3>
                    </div>
                    <div class="cover-modal-url">${coverUrl}</div>
                    <div class="cover-modal-actions">
                        <button class="cover-btn-primary" id="copy-btn">📋 复制链接</button>
                        <button class="cover-btn-download" id="download-btn">💾 下载图片</button>
                        <button class="cover-btn-secondary" id="open-btn">🔗 打开图片</button>
                    </div>
                </div>
            </div>
        `;

        if (!document.getElementById('cover-modal-styles')) {
            const style = document.createElement('style');
            style.id = 'cover-modal-styles';
            style.textContent = `
                .cover-modal-backdrop {
                    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
                    background: rgba(0,0,0,0.4); backdrop-filter: blur(6px);
                    display: flex; justify-content: center; align-items: center;
                    z-index: 10000000;
                    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
                    animation: coverFadeIn 0.2s ease;
                }
                .cover-modal-card {
                    position: relative;
                    background: rgba(255,255,255,0.95); backdrop-filter: blur(20px);
                    border-radius: 20px; padding: 28px 24px 20px;
                    width: 90%; max-width: 420px;
                    box-shadow: 0 25px 50px rgba(0,0,0,0.25);
                    animation: coverCardSlide 0.25s ease;
                }
                .cover-modal-close-btn {
                    position: absolute;
                    top: 12px; right: 12px;
                    width: 32px; height: 32px;
                    border-radius: 50%;
                    background: rgba(0,0,0,0.05);
                    border: none;
                    font-size: 18px; color: #666;
                    cursor: pointer;
                    display: flex; align-items: center; justify-content: center;
                    transition: background 0.2s;
                }
                .cover-modal-close-btn:hover { background: rgba(0,0,0,0.1); }
                .cover-modal-header {
                    display: flex; align-items: center; justify-content: center;
                    gap: 8px; margin-bottom: 20px;
                }
                .cover-modal-icon { font-size: 28px; }
                .cover-modal-title {
                    margin: 0; font-size: 20px; font-weight: 600; color: #1a1a1a;
                }
                .cover-modal-url {
                    background: #f0f2f5; border-radius: 12px; padding: 14px;
                    margin-bottom: 24px; font-size: 14px; color: #555;
                    word-break: break-all; max-height: 140px; overflow-y: auto;
                    line-height: 1.5;
                }
                .cover-modal-actions {
                    display: flex; gap: 10px;
                }
                .cover-btn-primary, .cover-btn-download, .cover-btn-secondary {
                    flex: 1;
                    padding: 10px 12px; border-radius: 12px; font-size: 15px;
                    font-weight: 500; cursor: pointer; transition: all 0.2s;
                    border: none; outline: none; white-space: nowrap;
                }
                .cover-btn-primary {
                    background: #07c160; color: white; box-shadow: 0 2px 8px rgba(7,193,96,0.3);
                }
                .cover-btn-primary:hover { background: #06ad56; transform: translateY(-1px); }
                .cover-btn-download {
                    background: #0d8bf1; color: white; box-shadow: 0 2px 8px rgba(13,139,241,0.3);
                }
                .cover-btn-download:hover { background: #0b7ad9; transform: translateY(-1px); }
                .cover-btn-secondary {
                    background: #fff; color: #333; border: 1px solid #e0e0e0;
                }
                .cover-btn-secondary:hover { background: #f5f5f5; }
                @keyframes coverFadeIn { from { opacity: 0; } to { opacity: 1; } }
                @keyframes coverCardSlide {
                    from { opacity: 0; transform: translateY(15px) scale(0.96); }
                    to { opacity: 1; transform: translateY(0) scale(1); }
                }
                @keyframes coverToastFadeIn {
                    from { opacity: 0; transform: translate(-50%, -10px); }
                    to { opacity: 1; transform: translate(-50%, 0); }
                }
            `;
            document.head.appendChild(style);
        }

        const backdrop = modal.querySelector('.cover-modal-backdrop');
        const copyBtn = modal.querySelector('#copy-btn');
        const downloadBtn = modal.querySelector('#download-btn');
        const openBtn = modal.querySelector('#open-btn');
        const closeBtn = modal.querySelector('#close-btn-top');

        const closeModal = () => {
            modal.remove();
            document.removeEventListener('keydown', escHandler);
        };

        backdrop.addEventListener('click', (e) => {
            if (e.target === backdrop) closeModal();
        });
        closeBtn.addEventListener('click', closeModal);

        copyBtn.addEventListener('click', async () => {
            const success = await copyToClipboard(coverUrl);
            if (success) {
                copyBtn.textContent = '✅ 已复制';
            } else {
                copyBtn.textContent = '❌ 复制失败';
                copyBtn.style.background = '#f5222d';
            }
            setTimeout(closeModal, 800);
        });

        downloadBtn.addEventListener('click', async () => {
            downloadBtn.textContent = '⏳ 下载中...';
            downloadBtn.disabled = true;
            const title = getArticleTitle();
            await downloadImage(coverUrl, title);
            closeModal();
        });

        openBtn.addEventListener('click', () => {
            window.open(coverUrl, '_blank');
            closeModal();
        });

        const escHandler = (e) => {
            if (e.key === 'Escape') closeModal();
        };
        document.addEventListener('keydown', escHandler);
        document.body.appendChild(modal);
    }

    // 悬浮按钮
    function createFloatingButton() {
        if (document.getElementById('cover-extractor-btn')) return;

        const btn = document.createElement('div');
        btn.id = 'cover-extractor-btn';
        btn.innerHTML = '📸';
        btn.title = '提取公众号封面高清图';
        Object.assign(btn.style, {
            position: 'fixed',
            bottom: '80px',
            right: '24px',
            width: '50px',
            height: '50px',
            borderRadius: '50%',
            background: 'rgba(255,255,255,0.7)',
            backdropFilter: 'blur(10px)',
            WebkitBackdropFilter: 'blur(10px)',
            border: '1px solid rgba(255,255,255,0.3)',
            boxShadow: '0 4px 16px rgba(0,0,0,0.12), 0 0 0 1px rgba(7,193,96,0.2)',
            color: '#07c160',
            fontSize: '26px',
            display: 'flex',
            justifyContent: 'center',
            alignItems: 'center',
            cursor: 'pointer',
            zIndex: '10000001',
            userSelect: 'none',
            transition: 'all 0.25s cubic-bezier(0.2, 0, 0, 1)'
        });

        btn.addEventListener('mouseenter', () => {
            btn.style.transform = 'scale(1.15)';
            btn.style.boxShadow = '0 8px 24px rgba(0,0,0,0.18), 0 0 0 2px rgba(7,193,96,0.3)';
            btn.style.background = 'rgba(255,255,255,0.85)';
        });
        btn.addEventListener('mouseleave', () => {
            btn.style.transform = 'scale(1)';
            btn.style.boxShadow = '0 4px 16px rgba(0,0,0,0.12), 0 0 0 1px rgba(7,193,96,0.2)';
            btn.style.background = 'rgba(255,255,255,0.7)';
        });
        btn.addEventListener('click', () => {
            const coverUrl = getCoverImageUrl();
            if (coverUrl) {
                showResultModal(coverUrl);
            } else {
                showToast('未找到封面图片，请确认页面是否正确', 'error');
            }
        });

        document.body.appendChild(btn);
    }

    function init() {
        createFloatingButton();
    }

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

    const observer = new MutationObserver(() => {
        if (!document.getElementById('cover-extractor-btn')) {
            createFloatingButton();
        }
    });
    observer.observe(document.body, { childList: true, subtree: true });
})();