// ==UserScript==
// @name         1688 详情页图片批量下载
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  在 1688 详情页提取特定标签图片，去除后缀并批量下载
// @author       Gemini & Charon2050
// @match        *://detail.1688.com/*
// @grant        GM_download
// @license      Unlicense
// @downloadURL https://update.greasyfork.icu/scripts/571051/1688%20%E8%AF%A6%E6%83%85%E9%A1%B5%E5%9B%BE%E7%89%87%E6%89%B9%E9%87%8F%E4%B8%8B%E8%BD%BD.user.js
// @updateURL https://update.greasyfork.icu/scripts/571051/1688%20%E8%AF%A6%E6%83%85%E9%A1%B5%E5%9B%BE%E7%89%87%E6%89%B9%E9%87%8F%E4%B8%8B%E8%BD%BD.meta.js
// ==/UserScript==

(function() {
    'use strict';

    // 1. 创建悬浮按钮
    const btn = document.createElement('button');
    btn.innerText = '📦 下载图片';
    btn.style.position = 'fixed';
    btn.style.bottom = '100px';
    btn.style.right = '50px';
    btn.style.zIndex = '999999';
    btn.style.padding = '12px 24px';
    btn.style.backgroundColor = '#ff6000'; // 1688 主题色
    btn.style.color = '#fff';
    btn.style.border = 'none';
    btn.style.borderRadius = '8px';
    btn.style.cursor = 'pointer';
    btn.style.boxShadow = '0 4px 12px rgba(255, 96, 0, 0.4)';
    btn.style.fontSize = '16px';
    btn.style.fontWeight = 'bold';
    btn.style.transition = 'all 0.3s';

    // 悬停效果
    btn.onmouseover = () => {
        btn.style.backgroundColor = '#e55600';
        btn.style.transform = 'translateY(-2px)';
    };
    btn.onmouseout = () => {
        btn.style.backgroundColor = '#ff6000';
        btn.style.transform = 'translateY(0)';
    };

    document.body.appendChild(btn);

    // 2. 点击事件逻辑
    btn.addEventListener('click', () => {
        const urlSet = new Set(); // 使用 Set 去重

        // --- 目标一：处理 span.v-image-cover ---
        const covers = document.querySelectorAll('span.v-image-cover');
        covers.forEach(el => {
            const bgImage = el.style.backgroundImage;
            if (bgImage) {
                // 提取 url("...") 中的链接
                const match = bgImage.match(/url\(['"]?(.*?)['"]?\)/);
                if (match && match[1]) {
                    let url = match[1];
                    // 去除末尾的 _b.jpg
                    url = url.replace(/_b\.jpg$/i, '');
                    urlSet.add(url);
                }
            }
        });

        // --- 目标二：处理 div.item-image-icon 内的 img.ant-image-img ---
        const imgs = document.querySelectorAll('div.ant-image.v-image-wrap.item-image-icon img.ant-image-img');
        imgs.forEach(el => {
            let url = el.src;
            if (url) {
                // 去除末尾的 _sum.jpg
                url = url.replace(/_sum\.jpg$/i, '');
                urlSet.add(url);
            }
        });

        // 检查是否有获取到图片
        if (urlSet.size === 0) {
            alert('当前页面未找到符合条件的图片！请确保页面已完全加载。');
            return;
        }

        // --- 开始批量下载 ---
        btn.innerText = `⏳ 准备下载 (${urlSet.size}张)`;
        btn.style.backgroundColor = '#999';
        btn.disabled = true;

        let downloadedCount = 0;

        urlSet.forEach(url => {
            // 补全协议头 (处理 //cbu01... 这种格式)
            if (url.startsWith('//')) {
                url = location.protocol + url;
            }

            // 从 URL 中截取文件名作为下载保存的文件名
            let filename = url.substring(url.lastIndexOf('/') + 1);
            filename = filename.split('?')[0]; // 去除 URL 参数

            // 使用油猴 API 触发下载
            GM_download({
                url: url,
                name: filename,
                onload: () => {
                    downloadedCount++;
                    btn.innerText = `⏳ 下载中 (${downloadedCount}/${urlSet.size})`;
                    if (downloadedCount === urlSet.size) {
                        resetButton();
                    }
                },
                onerror: (err) => {
                    console.error('图片下载失败:', url, err);
                    downloadedCount++; // 即使失败也推进计数，防止按钮卡死
                    if (downloadedCount === urlSet.size) {
                        resetButton();
                    }
                }
            });
        });

        // 恢复按钮状态的函数
        function resetButton() {
            setTimeout(() => {
                btn.innerText = '✅ 下载完成';
                btn.style.backgroundColor = '#52c41a';
                setTimeout(() => {
                    btn.innerText = '📦 下载图片';
                    btn.style.backgroundColor = '#ff6000';
                    btn.disabled = false;
                }, 2000);
            }, 500);
        }
    });
})();