// ==UserScript==
// @name         爱给网音频助手-修复版本
// @namespace    http://tampermonkey.net/
// @version      1.3
// @description  自动识别音频接口，支持所有页面的音频提取
// @author       Kim
// @match        https://www.aigei.com/*
// @grant        GM_xmlhttpRequest
// @run-at       document-start
// @license MIT
// @downloadURL https://update.greasyfork.icu/scripts/573469/%E7%88%B1%E7%BB%99%E7%BD%91%E9%9F%B3%E9%A2%91%E5%8A%A9%E6%89%8B-%E4%BF%AE%E5%A4%8D%E7%89%88%E6%9C%AC.user.js
// @updateURL https://update.greasyfork.icu/scripts/573469/%E7%88%B1%E7%BB%99%E7%BD%91%E9%9F%B3%E9%A2%91%E5%8A%A9%E6%89%8B-%E4%BF%AE%E5%A4%8D%E7%89%88%E6%9C%AC.meta.js
// ==/UserScript==

(function() {
    'use strict';

    let lastInterceptedUrl = "";
    let activeBox = null;

    // --- 1. 底层拦截所有请求 ---
    const originOpen = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function(method, url) {
        this.addEventListener('readystatechange', function() {
            if (this.readyState === 4 && this.status === 200) {
                try {
                    const res = JSON.parse(this.responseText);
                    // 只要返回的数据里有状态码和 message(Base64)，就尝试解析
                    if (res.message && res.message.length > 20) {
                        const decoded = atob(res.message);
                        if (decoded.includes("http")) {
                            lastInterceptedUrl = decoded;
                            console.log("找到潜在音频链接:", lastInterceptedUrl);
                            updateButtonStatus(lastInterceptedUrl);
                        }
                    }
                } catch (e) {}
            }
        });
        originOpen.apply(this, arguments);
    };

    // --- 2. 追踪用户最后点击的资源 ---
    document.addEventListener('mousedown', (e) => {
        const box = e.target.closest('.audio-item-box') || e.target.closest('.play-item');
        if (box) {
            activeBox = box;
            console.log("当前锁定资源块:", box);
        }
    }, true);

    // --- 3. 更新按钮状态 ---
    function updateButtonStatus(url) {
        if (!activeBox) {
            // 如果没锁定，就更新页面上所有的“等待中”按钮
            const allBtns = document.querySelectorAll(".gm-download-btn");
            allBtns.forEach(b => setBtnReady(b, url));
            return;
        }
        const btn = activeBox.querySelector(".gm-download-btn");
        if (btn) setBtnReady(btn, url);
    }

    function setBtnReady(btn, url) {
        btn.innerHTML = "立即下载";
        btn.style.background = "#ff4757";
        btn.style.boxShadow = "0 0 10px rgba(255,71,87,0.5)";
        btn.onclick = (e) => {
            e.preventDefault();
            e.stopPropagation();
            const title = btn.closest('.audio-item-box, .play-item')?.querySelector('.title-name, .name')?.innerText || "audio_" + Date.now();
            doDownload(url, title);
        };
    }

    // --- 4. 绕过403下载 ---
    function doDownload(url, name) {
        btnFeedback("下载中...");
        GM_xmlhttpRequest({
            method: "GET",
            url: url,
            headers: { "Referer": "https://www.aigei.com/" },
            responseType: "blob",
            onload: function(res) {
                const blob = res.response;
                const link = document.createElement('a');
                link.href = window.URL.createObjectURL(blob);
                link.download = name.replace(/[\\/:*?"<>|]/g, "_") + ".mp3";
                link.click();
                btnFeedback("下载成功");
            },
            onerror: () => alert("下载失败，请检查网络")
        });
    }

    function btnFeedback(text) {
        if (activeBox) activeBox.querySelector(".gm-download-btn").innerHTML = text;
    }

    // --- 5. 注入下载按钮 ---
    function inject() {
        // 兼容搜索列表和详情页
        const items = document.querySelectorAll(".audio-item-box, .play-item, .item-box");
        items.forEach(item => {
            if (item.querySelector(".gm-download-btn")) return;

            const anchor = item.querySelector(".title-name") || item.querySelector(".name") || item.querySelector(".title");
            if (!anchor) return;

            const btn = document.createElement("button");
            btn.className = "gm-download-btn";
            btn.innerHTML = "等待播放";
            btn.style = "margin-left:10px; padding:3px 12px; border-radius:20px; border:none; background:#57606f; color:white; cursor:pointer; font-size:11px; transition: 0.3s;";
            anchor.parentNode.insertBefore(btn, anchor.nextSibling);
        });
    }

    setInterval(inject, 2000);
})();