// ==UserScript==
// @name         批量保存Telegram用户头像
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  提取blob URL 中的 UUID 作为文件名批量下载头像，默认保存格式为jpg
// @author       GR：PM
// @license      MIT
// @match        https://web.telegram.org/k/*
// @grant        none
// @downloadURL https://update.greasyfork.icu/scripts/571249/%E6%89%B9%E9%87%8F%E4%BF%9D%E5%AD%98Telegram%E7%94%A8%E6%88%B7%E5%A4%B4%E5%83%8F.user.js
// @updateURL https://update.greasyfork.icu/scripts/571249/%E6%89%B9%E9%87%8F%E4%BF%9D%E5%AD%98Telegram%E7%94%A8%E6%88%B7%E5%A4%B4%E5%83%8F.meta.js
// ==/UserScript==

(function () {
    "use strict";

    // 创建控制按钮
    function createUI() {
        const container = document.createElement("div");
        container.style.cssText =
            "position:fixed; bottom:20px; right:20px; z-index:9999; display:flex; flex-direction:column; gap:10px;";

        const autoBtn = document.createElement("button");
        autoBtn.innerText = "⚡ 自动加载并下载全部头像";
        styleButton(autoBtn, "#ff8c00");

        autoBtn.onclick = startAutoProcess;

        container.appendChild(autoBtn);
        document.body.appendChild(container);
    }

    function styleButton(btn, color) {
        btn.style.cssText = `
            padding: 12px 20px;
            background-color: ${color};
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            font-weight: bold;
            transition: transform 0.2s;
        `;
        btn.onmouseover = () => (btn.style.transform = "scale(1.05)");
        btn.onmouseout = () => (btn.style.transform = "scale(1)");
    }

    // 等待函数
    const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

    // 核心流程：自动翻页 -> 等待加载 -> 下载
    async function startAutoProcess() {
        console.log("开始自动执行...");

        let nextButton = document.querySelector(".profile-avatars-arrow-next");

        // 1. 循环点击“下一步”直到按钮消失或不可点击
        while (
            nextButton &&
            getComputedStyle(nextButton).display !== "none" &&
            getComputedStyle(nextButton).visibility !== "hidden"
        ) {
            nextButton.click();
            // 稍微等待动画和加载，300ms 是一个比较稳妥的值
            await sleep(300);

            // 重新获取按钮状态
            nextButton = document.querySelector(".profile-avatars-arrow-next");

            // 检查是否还有未加载的 hide 元素
            const hiddenAvatars = document.querySelectorAll(
                ".profile-avatars-avatar.hide",
            );
            if (hiddenAvatars.length === 0) break;
        }

        console.log("翻页完成，等待最终资源同步...");
        await sleep(1000); // 给 Blob 生成留一点最后的时间

        // 2. 执行下载
        downloadAll();
    }

    function downloadAll() {
        const avatarImages = document.querySelectorAll(
            ".profile-avatars-avatars .avatar-photo",
        );

        if (avatarImages.length === 0) {
            alert("未找到可下载的头像图片。");
            return;
        }

        console.log(`准备下载 ${avatarImages.length} 张头像...`);

        avatarImages.forEach((img, index) => {
            const src = img.src;
            if (!src || !src.startsWith("blob:")) return;

            const uuid = src.split("/").pop();
            const fileName = `${uuid}.jpg`;

            const link = document.createElement("a");
            link.href = src;
            link.download = fileName;

            // 批量下载间隔，防止浏览器崩溃
            setTimeout(() => {
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                console.log(
                    `[${index + 1}/${avatarImages.length}] 已保存: ${fileName}`,
                );
            }, index * 200);
        });

        console.log(`完成。`)
    }

    createUI();
})();