// ==UserScript==
// @name         智谱GLM-Coding plan 抢购
// @namespace    http://tampermonkey.net/
// @version      2.0
// @description  修改前端，让抢购按钮不需要在规定时间才可以点击，比别人更快一步进入付款界面
// @author       hesheng4869
// @match        *://www.bigmodel.cn/*
// @match        *://www.bigmodel.cn/glm-coding
// @match        *://bigmodel.cn/glm-coding*
// @match        *://*.bigmodel.cn/glm-coding*
// @run-at       document-start
// @grant        none
// @license MIT
// @downloadURL https://update.greasyfork.icu/scripts/575588/%E6%99%BA%E8%B0%B1GLM-Coding%20plan%20%E6%8A%A2%E8%B4%AD.user.js
// @updateURL https://update.greasyfork.icu/scripts/575588/%E6%99%BA%E8%B0%B1GLM-Coding%20plan%20%E6%8A%A2%E8%B4%AD.meta.js
// ==/UserScript==

(function() {
    'use strict';
 
    const SCRIPT_NAME = '[抢购助手1.0]';
    const STOCK_VALUE = 999;
    console.log(`${SCRIPT_NAME} 拦截器已启动...`);
 
    function isProductObject(obj) {
        return obj.price !== undefined ||
               obj.productId !== undefined ||
               obj.title !== undefined;
    }
 
    function deepModify(obj) {
        if (!obj || typeof obj !== 'object') return;
 
        // 篡改核心售罄标识
        if (obj.isSoldOut === true) {
            obj.isSoldOut = false;
        }
        if (obj.soldOut === true) {
            obj.soldOut = false;
        }
 
        // 如果遇到 disabled，且该对象看起来是个商品，则强制启用
        if (obj.disabled === true && isProductObject(obj)) {
            obj.disabled = false;
        }
 
        // 修改库存数量
        if (obj.stock === 0) {
            obj.stock = STOCK_VALUE;
        }
 
        // 递归处理
        for (const key in obj) {
            if (obj[key] && typeof obj[key] === 'object') {
                deepModify(obj[key]);
            }
        }
    }
 
    function modifyResponseText(text) {
        return text
            .replace(/"isSoldOut":true/g, '"isSoldOut":false')
            .replace(/"disabled":true/g, '"disabled":false')
            .replace(/"soldOut":true/g, '"soldOut":false')
            .replace(/"stock":0/g, `"stock":${STOCK_VALUE}`);
    }

    function hasSoldOutStatus(text) {
        return text.includes('"isSoldOut":true') ||
               text.includes('"disabled":true') ||
               text.includes('"soldOut":true');
    }
 
    // ==========================================
    // 战术一：拦截 SSR 页面初始注入数据
    // 通过劫持浏览器的 JSON 解析器，修改带有"售罄"属性的对象
    // ==========================================
 
    const originalJSONParse = JSON.parse;
 
    JSON.parse = function(text, reviver) {
        const result = originalJSONParse(text, reviver);
 
        try {
            deepModify(result);
        } catch (error) {

        }
 
        return result;
    };
 
    // ==========================================
    // 战术二：拦截 Fetch 接口请求
    // 针对用户在页面停留时，前端向后端发起的库存/价格检查
    // ==========================================
 
    const originalFetch = window.fetch;
 
    window.fetch = async function(...args) {
        const response = await originalFetch.apply(this, args);
        const contentType = response.headers.get('content-type') || '';
 
        if (!contentType.includes('application/json')) {
            return response;
        }
 
        const clone = response.clone();
 
        try {
            let text = await clone.text();
 
            if (hasSoldOutStatus(text)) {
                console.log(`${SCRIPT_NAME} 拦截到 Fetch 售罄数据，正在执行篡改！`, args[0]);
                text = modifyResponseText(text);
 
                return new Response(text, {
                    status: response.status,
                    statusText: response.statusText,
                    headers: response.headers
                });
            }
        } catch (error) {
            
        }
 
        return response;
    };
 
    // ==========================================
    // 战术三：拦截 XMLHttpRequest (兜底方案)
    // ==========================================
 
    const originalXHROpen = XMLHttpRequest.prototype.open;
    const originalXHRSend = XMLHttpRequest.prototype.send;
 
    XMLHttpRequest.prototype.open = function(method, url, ...rest) {
        this._requestUrl = url;
        return originalXHROpen.call(this, method, url, ...rest);
    };
 
    XMLHttpRequest.prototype.send = function(...args) {
        this.addEventListener('readystatechange', function() {
            if (this.readyState !== 4 || this.status !== 200) {
                return;
            }
 
            const contentType = this.getResponseHeader('content-type') || '';
 
            if (!contentType.includes('application/json')) {
                return;
            }
 
            try {
                let text = this.responseText;
 
                if (hasSoldOutStatus(text)) {
                    console.log(`${SCRIPT_NAME} 拦截到 XHR 售罄数据，正在执行篡改！`, this._requestUrl);
                    text = modifyResponseText(text);
 
                    Object.defineProperty(this, 'responseText', {
                        get: function() { return text; }
                    });
                    Object.defineProperty(this, 'response', {
                        get: function() { return JSON.parse(text); }
                    });
                }
            } catch (error) {

            }
        });
 
        originalXHRSend.apply(this, args);
    };
 
})();