import moment from 'moment';
import fs from 'fs';
import { promises as fsPromises } from 'fs';
import commonModel from '../../model/commonModel.js';
import config from '../../config/index.js';
import _ from 'lodash';
import axios from 'axios';
import { Encrypt, Decrypt } from '../../util/crypto/index.js';
import { stringUtils } from '../../util/stringClass.js';
import WXBizDataCrypt from '../../util/WXBizDataCrypt.js';
import { globalCache } from '../../util/GlobalCache.js';
import constantClass from '../../util/constant/index.js';
import yjbdc from '../../model/yjbdc.js';
import aiController from './aiController.js';

import PDFDocument from 'pdfkit';
import tencentcloud from 'tencentcloud-sdk-nodejs-ocr';

const ONE_DAY_MAX_BUILD_COUNT=12;//一天最大生成数

const OcrClient = tencentcloud.ocr.v20181119.Client;

//小程序登录
export async function YJBDCLogin(ctx) {
    let param = ctx.request.body;
    if (param.param) {
        const paramStr = Decrypt(param.param, config.urlSecrets.aes_key, config.urlSecrets.aes_iv);
        //console.log("paramStr:"+paramStr);
        param = JSON.parse(paramStr);
    }
    const code = param.Code;
    //console.log("code:"+code);
    const url = `https://api.weixin.qq.com/sns/jscode2session?appid=${config.wx.yjbdc_appid}&secret=${config.wx.yjbdc_appsecret}&js_code=${code}&grant_type=authorization_code`;

    let result = await axios.get(url)
        .then(res => {
            const json = res.data;
            //console.log("json:"+json);
            if (json && json.openid) {
                param.OpenID = json.openid;
                param.sessionKey = json.session_key;
                if (json.unionid)
                    param.UnionID = json.unionid;
                return {errcode: 10000};
            }
            else {
                return json;
            }
        })
        .catch(err => {
            return {errcode: 101, errStr: err};
        });

    if (result.errcode == 10000) {
        delete param.Code;
        if (param.sessionKey && param.iv && param.encryptedData){
            //console.log("param.sessionKey:"+param.sessionKey);
            const pc = new WXBizDataCrypt(config.wx.yjbdc_appid, param.sessionKey);
            const dataUnionID = pc.decryptData(param.encryptedData , param.iv);
            //console.log(dataUnionID);
            param.UnionID = dataUnionID.unionId;
        }

        delete param.sessionKey;
        delete param.iv;
        delete param.encryptedData;

        //todo
        //param.OpenID="o4UHq4gaNlHfdTWxgl3fTgC1mFsI";

        let userList = await yjbdc.GetUsersInfo(param);
        if (userList.length > 0) {
            param.LastLoginTime = new Date();
            const time1 = moment(userList[0].ProductServiceTime).format('YYYY-MM-DD HH:mm:ss');
            const time3 = moment().format('YYYY-MM-DD HH:mm:ss');
            if (time1 < time3)
                param.IsMember = 0;

            delete param.Introducer;
            delete param.UserSource;
            delete param.SourceID;
            //console.log(param.NickName);
            if (param.NickName == "陌生用户") {
                delete param.NickName;
                delete param.AvatarUrl;
                delete param.Language;
                delete param.Gender;
                delete param.City;
                delete param.Province;
                delete param.Country;
            }

            await yjbdc.UpdateUsers(param);
            userList = await yjbdc.GetUsersInfo(param);
        }
        else {
            param.NickName = "陌生用户";
            param.AvatarUrl = "../images/userface_default.png";
            param.CreateTime = new Date();
            param.LastLoginTime = param.CreateTime;
            param.ProductServiceTime = param.CreateTime;
            const inseredID = await yjbdc.AddUsers(param);
            userList = await yjbdc.GetUsersInfo(param);
        }

        delete userList[0].OpenID;
        delete userList[0].UnionID;

        //产品支付是否显示
        if (param.ProgramVersion) {
            let param2 = {
                ProgramID: 186,
                Version: param.ProgramVersion,
            };
            let result3 = await commonModel.GetProductVersionList(param2);
            if (result3) {
                if ((param2.Version == result3[0].Version && result3[0].IsShowPay <= 0)
                    || param2.Version > result3[0].Version) {
                    userList[0].IsShow = result3[0].IsShowPay;
                }
                else {
                    userList[0].IsShow = 1;
                }

                //针对iphone测试用户，永远是无支付状态
                if (userList[0].Brand == 'iPhone' && userList[0].WXLanguage == 'en-US'
                    && userList[0].UserSource == '1001' && userList[0].IsPay == 0) {
                    userList[0].IsShow = 0;
                }

                //针对微信测试用户，永远是无支付状态
                if ((userList[0].UserSource=='1001' && userList[0].System=="iOS 10.0.1")
                    || (!userList[0].UserSource && (!userList[0].LastUserSource || userList[0].LastUserSource>10000))
                    || userList[0].NickName.indexOf("dgztest")>=0){
                    userList[0].IsShow=-1;
                }

                if (userList[0].IsMember===1)
                    userList[0].IsShow=1;
            }
        }

        result = {errcode: 10000, result: userList[0]};
    }

    ctx.body = result;
}

//OCR获取单词
export async function OCRImageData(ctx) {
    const params = ctx.request.body;
    
    const clientConfig = {
        credential: {
            secretId: config.tencentcloud.secretId,
            secretKey: config.tencentcloud.secretKey,
        },
        region: "ap-guangzhou",
        profile: {
            httpProfile: {
                endpoint: "ocr.tencentcloudapi.com",
            },
        },
    };

    // 实例化要请求产品的client对象,clientProfile是可选的
    const client = new OcrClient(clientConfig);
    const result = await client.GeneralBasicOCR(params);

    let param2={};
    param2.UserID=ctx.query.UserID;
    param2.CreateTime=moment().format('YYYY-MM-DD HH:mm:ss');
    param2.Params=JSON.stringify(params);
    param2.JSONString=JSON.stringify(result);
    await yjbdc.AddOCRInfo(param2);
    ctx.body = {"errcode": 10000, result};
}

//AI生成文章
export async function GenerateArticle(ctx) {

    const url='GenerateArticle?UserID='+ctx.query.UserID;
    let result = globalCache.get(url);
    if (result === 0) {
        const params = ctx.request.body;
        const words = params.Words;
        let articleStyle = params.ArticleStyle;

        if (words){
            
            const menuConfig=constantClass.GetYJBDCGenerateConfig();
        
            //console.log("content:"+content);

            let level="";
            if (!params.Level || params.Level=="" || params.Level==undefined || params.Level>="6"){
                params.Level=0;
            }

            level=menuConfig.Level[Number(params.Level)].Name;

            let articleStyleContent="";
            for(let i=0;i<menuConfig.ArticleStyle.length;i++){
                if (params.ArticleStyle==menuConfig.ArticleStyle[i].Name){
                    articleStyleContent=menuConfig.ArticleStyle[i].Content;
                }
            }
            //console.log("Level:"+level);
            let content={
                "instruction": "用单词("+words+")生成"+level+"难度童话故事。",
                "requirements": [
                    "200-300词，要求："+articleStyle+"（"+articleStyleContent+"）",
                    "每句分数组提供中英双语",
                    "所有单词至少出现一次（允许变形）",
                    "生成5道四选一阅读题（含答案）"
                ],
                "output_format": {
                    "ArticleEnglish": ["句子1", "句子2..."],
                    "ArticleChinese": ["翻译1", "翻译2..."],
                    "Question": [{
                    "QuestionEnglish": "题干",
                    "QuestionChinese": "题干翻译",
                    "OptionsEnglish": ["A.选项", "B.选项", "C.选项", "D.选项"],
                    "OptionsChinese": ["A.译", "B.译", "C.译", "D.译"],
                    "Answer": "正确选项字母"
                    }]
                }
            };
            content=JSON.stringify(content);
            
            // 从请求参数中获取AI提供者，如果没有指定则使用默认值
            let aiProvider = '';
            for(let i=0;i<menuConfig.AIVersion.length;i++){
                if (menuConfig.AIVersion[i].Version==params.AIVersion){
                    aiProvider=menuConfig.AIVersion[i].Model;
                    break;
                }
            }

            //给用户一些比较好的体验
            if (params.AIVersion=="1.0"){
                aiProvider = 'ali-Moonshot-Kimi-K2-Instruct';
            }
            else if (params.AIVersion=="1.5"){
                aiProvider = 'doubao-kimi-k2-250711';
            }
            
            try {
                //开始时间
                let timeStart=new Date().getTime();
                // 使用aiController生成文章
                let result2 = await aiController.generateArticle(content, aiProvider);
                
                //console.log(result2);
                //debugger;

                // 校验和修复JSON结构
                result2 = aiController.validateAndFixJSON(result2);
                //console.log("JSON结构已校验和修复");

                result2 =aiController.normalizeArticleFields(result2);
                
                // 解析JSON以增强FormsOfWords
                
                const jsonObj = JSON.parse(result2);
                // 增强FormsOfWords，检测文章中单词的变形形式和拼写错误
                const enhancedJsonObj = aiController.enhanceFormsOfWords(jsonObj, words);
                // 将增强后的对象转回JSON字符串
                result2 = JSON.stringify(enhancedJsonObj);
                //console.log("FormsOfWords已增强，添加了单词变形和拼写错误检测");
                
                // 记录增强后的单词数量
                if (enhancedJsonObj.FormsOfWords && Array.isArray(enhancedJsonObj.FormsOfWords)) {
                    console.log(`增强了${enhancedJsonObj.FormsOfWords.length}个单词的变形形式`);
                }

                let timeEnd=new Date().getTime();
                
                let param2={};
                param2.UserID=ctx.query.UserID;
                param2.CreateTime=moment().format('YYYY-MM-DD HH:mm:ss');
                param2.Words=words;
                param2.Level=params.Level;
                param2.articleStyle=articleStyle;
                param2.AIProvider=aiProvider;
                param2.BuildStr=content;
                param2.GenerateTime=Math.round((timeEnd-timeStart)/1000);
                console.log("生成时间："+param2.GenerateTime+"秒");
                
                // 尝试解析JSON以获取ArticleStart
                const jsonObj2 = JSON.parse(result2);
                param2.ArticleStart = jsonObj2.ArticleEnglish && jsonObj2.ArticleEnglish.length > 0 ? jsonObj2.ArticleEnglish.join("\r\n") : "No content available";
                
                // 去除JSON字符串中的所有换行符(\r\n, \n, \r)
                param2.JSONString=JSON.stringify(result2.replace(/[\r\n]+/g, ''));
                param2.Flag=0;
                let idInsert= await yjbdc.AddArticleInfo(param2);

                //result = { errcode: 10000, result: result2 };

                let result3={};
                result3.ID=idInsert.insertId;
                result3.Content=result2;
                result3.IsNew=true;
                result = { errcode: 10000, result: result3 };

                globalCache.set(url, result, config.BufferMemoryTime);
                console.log("缓存60秒");
            }
            catch(err){
                console.error("AI生成错误："+err);
                result = { errcode: 10000, result: "-1" };
            }

        }
        else{
            console.log("空单词串");
            result = { errcode: 10000, result: "-1" };
        }
    }
    
    ctx.body = result;
}

export async function GetYJBDCGenerateConfig(ctx) {
    const param = {
        UserID: ctx.query.UserID || 0,
    };

    let result=constantClass.GetYJBDCGenerateConfig();

    for (let i=0;i<result.Level.length;i++){
        delete result.Level[i].English;
    }

    for(let i=0;i<result.ArticleStyle.length;i++){
        delete result.ArticleStyle[i].English;
        delete result.ArticleStyle[i].Content;
    }

    
    if (param.UserID>3){
        result.AIVersion.splice(2,result.AIVersion.length-2);
        if (param.UserID==185){
            const configArr=constantClass.GetYJBDCGenerateConfig();
            result.AIVersion.push(configArr.AIVersion[5]);
        }
        // if (param.UserID<4){
        //     const configArr=constantClass.GetYJBDCGenerateConfig();
        //     result.AIVersion.push(configArr.AIVersion[6]);
        // }
    }
    ctx.body = {"errcode": 10000, result:result};
}

//获得秒过当天任务完成后的英语单词（未完成）
export async function getMiaoguoTodayAllWords(ctx) {
    const param = {
        UserID: ctx.query.UserID || 0,
    };

    const url = `https://www.kylx365.com/api/GetMiaoguoCardList2?UserID=${param.UserID}&IsToday=2&CardType=0&OrderType=ac.LastTime%20desc`;

    let result = await axios.get(url)
        .then(res => {
            let list = res.data.result.List;
            if (list && list.length>0) {
                
                let arr=[];
                for(let i=0;i<list.length;i++){
                    arr.push(list[i].Content[1].Content);
                }

                let arr2=stringUtils.extractEnglishWords(arr);
                console.log(arr2.length);

                return {"errcode": 10000, result:result}
            }
            else{
                return {errcode: 101};
            }
        })
        .catch(err => {
            return {errcode: 101, errStr: err};
        });

   
    ctx.body = result;
}

//获得文章列表或具体文章
export async function GetYJBDCArticleList(ctx) {
    const param = {
        UserID: ctx.query.UserID || 0,
        ID:ctx.query.ID || 0,
        IsChoiceness:ctx.query.IsChoiceness || 0,//是否是精选文章
        IsTodayCount: ctx.query.IsTodayCount || false,
        IsNew: ctx.query.IsNew || 0,
        PageID: ctx.query.PageID || 999999,
        PageCount: ctx.query.PageCount || 5,
    };
    // 尝试从缓存获取
    const url='GetYJBDCArticleList?IsChoiceness='+param.IsChoiceness+'&UserID='+param.UserID+'&ID='+param.ID;
    let result = globalCache.get(url);
    if (param.IsNew==1)
        result=0;
    if (result === 0) {

        result = await yjbdc.GetYJBDCArticleList(param);
        
        let menuConfig=constantClass.GetYJBDCGenerateConfig();
        for(let i=0;i<result.length;i++){
            let item=result[i];
            item.CreateTime=moment(item.CreateTime).format("YYYY年MM月DD日 HH:mm");
            //debugger;
            item.LevelStr=menuConfig.Level[item.Level].Name;
        }
        
        
        globalCache.set(url, result, config.BufferMemoryTime);
        console.log("缓存"+config.BufferMemoryTime+"秒");
    }


    //console.log(result.length);

    if (param.IsTodayCount && !param.ID){
        let count=0,unReadCount=0;
        const today=moment().format("YYYY年MM月DD日 00:00");
        for(let i=0;i<result.length;i++){
            if (result[i].CreateTime>=today)
                count++;
            if (result[i].Flag==0 && result[i].ReadCount==0)
                unReadCount++;                
        }

        let maxcount=ONE_DAY_MAX_BUILD_COUNT;
        if (param.UserID<4){
            maxcount=100;
        }
        result={
            TodayCount:count,
            MaxCount:maxcount,
            UnReadCount:unReadCount,
        };
    }
    else if (!param.ID){
        let arr=[],count=0,total=0;
        for(let i=0;i<result.length;i++){
            if (result[i].Flag==0){
                if (param.PageID>result[i].ID && count<param.PageCount){
                    arr.push(result[i]);
                    count++;
                }
                total++;
            }
        }
        result=arr;
        if (result.length>0)
            result[0].RowsCount=total;
    }
    // console.log(result.length);
    // console.log(result.TodayCount);

    ctx.body = {"errcode": 10000, result:result};
}

//删除生成的文章
export async function DeleteYJBDCArticleList(ctx) {
    const param = {
        UserID: ctx.query.UserID || 0,
        ID: ctx.query.ID || 0,
        Flag:-1,
    };
    
    if (param.ID>0){
        const url='GetYJBDCArticleList?UserID='+param.UserID+"&ID=0";
        globalCache.delete(url);
        await yjbdc.UpdateYJBDCArticle(param);
    }
    
    ctx.body = {"errcode": 10000};
}

export async function UpdateYJBDCArticle(ctx) {
    const param = ctx.request.body;
    
    if (param.ID>0 && param.UserID<12 && param.Source=="web"){
        const url='GetYJBDCArticleList?IsChoiceness=0&UserID='+param.UserID+"&ID=0";
        globalCache.delete(url);
        delete param.LevelStr;
        delete param.CreateTime;
        delete param.CreateTime;
        
        await yjbdc.UpdateYJBDCArticle(param);
    }
    
    ctx.body = {"errcode": 10000};
}

//更新阅读数
export async function UpdateYJBDCArticleReadCount(ctx) {
    const param = {
        UserID: ctx.query.UserID || 0,
        ID: ctx.query.ID || 0,
        ReadCount:1,
    };
    
    if (param.ID>0){
        await yjbdc.UpdateYJBDCArticle(param);
    }
    
    ctx.body = {"errcode": 10000};
}

//生成PDF
export async function GeneratePDF(ctx) {
    const params = ctx.request.body;
    if (!params || !params.Content) {
        ctx.status = 400;
        ctx.body = { error: 'Invalid request body: Content is required' };
        return;
    }

    const content = params.Content;

    const menuConfig=constantClass.GetYJBDCGenerateConfig();
    try {
        // 创建新的 PDF 文档 - 使用A4尺寸
        const doc = new PDFDocument({
            size: 'A4', // 使用标准A4尺寸 (595.28 x 841.89 points)
            margins: {
                top: 0,
                bottom: 0,
                left: 0,
                right: 0
            },
            autoFirstPage: true
        });

        // 注册中文字体
        doc.registerFont('ChineseFont', './public/fonts/方正黑体简体.TTF');
        
        // 定义字体选择函数
        const selectFont = (text, defaultFont = 'Helvetica') => {
            if (/[\u4E00-\u9FFF]/.test(text)) {
                return 'ChineseFont';
            }
            return defaultFont;
        };

        // 收集生成的 PDF 数据
        const chunks = [];
        doc.on('data', (chunk) => chunks.push(chunk));
        
        // 像素到点(pt)的转换函数
        const pixelToPt = (pixel) => pixel * (595.28 / 2100);

        // 获取文章内容
        let articleText = "";
        if (content.ArticleEnglish) {
            articleText = Array.isArray(content.ArticleEnglish) ? 
                content.ArticleEnglish.join(" ") : content.ArticleEnglish;
        } else {
            articleText = "No content available";
        }
        articleText = articleText.replace(/<[^>]*>/g, '');
            
        // 获取单词列表
        let words = [];
        if (content.Words) {
            words = typeof content.Words === 'string' ? 
                content.Words.split(",") : 
                (Array.isArray(content.Words) ? content.Words : []);
        }

        // 获取问题列表
        let questions = [];
        if (content.Question && Array.isArray(content.Question)) {
            questions = content.Question;
        }


        let articleStyleArr=menuConfig.ArticleStyle;
        let articleStyle="Story";
        for(let i=0;i<articleStyleArr.length;i++){
            if (articleStyleArr[i].Name==content.ArticleStyle){
                articleStyle=articleStyleArr[i].English;
                break;
            }
        }

        // 1. 标题 - 文章类型
        doc.font(selectFont(articleStyle))
           .fontSize(pixelToPt(48))
           .text(articleStyle, 
                 pixelToPt(120), pixelToPt(110));

        // 2. 副标题 - 难度级别
        doc.font('Helvetica')
           .fontSize(pixelToPt(30))
           .text(menuConfig.Level[Number(content.Level)].English || "", 
                 pixelToPt(120), pixelToPt(170));

        // 3. 时间
        const currentDate = moment().format("YYYY年MM月DD日 HH:mm");
        if (params.CreateTime)
            currentDate=moment(params.CreateTime).format("YYYY年MM月DD日 HH:mm");
        doc.font('ChineseFont')
           .fontSize(pixelToPt(30))
           .text(currentDate, 
                 pixelToPt(120), pixelToPt(212));


        // 4. 黑线
        doc.rect(pixelToPt(120), pixelToPt(289), pixelToPt(537), pixelToPt(10))
           .fill('black');

        // 5. 单词列表
        doc.font('Helvetica')
           .fontSize(pixelToPt(36));
        
        let wordY = pixelToPt(364);
        words.slice(0, 10).forEach(word => {
            doc.text(word, pixelToPt(122), wordY, {
                width: pixelToPt(535),
                align: 'left'
            });
            wordY += pixelToPt(70);
        });

        // 6. 文章内容
        // 先计算文章内容的行数
        doc.font('Helvetica');
        
        // 使用48字号计算文本高度
        const fontSize48 = pixelToPt(48);
        doc.fontSize(fontSize48);
        const textHeight48 = doc.heightOfString(articleText, {
            width: pixelToPt(1240),
            lineGap: pixelToPt(40.5)
        });
        
        // 计算行数 (文本高度 / (字体大小 + 行间距))
        const lineHeight = fontSize48 + pixelToPt(40.5);
        const lineCount = Math.ceil(textHeight48 / lineHeight);
        
        // 如果行数超过18行，则使用42字号
        const fontSize = lineCount > 18 ? pixelToPt(42) : pixelToPt(48);
        
        // 渲染文章内容
        doc.fontSize(fontSize)
           .text(articleText, pixelToPt(740), pixelToPt(105), {
               width: pixelToPt(1240),
               lineGap: pixelToPt(40.5)
           });

        // 7. 黑线
        const articleEndY = doc.y;
        doc.rect(pixelToPt(120), articleEndY + pixelToPt(41), 
                pixelToPt(1860), pixelToPt(10))
           .fill('black');

        // 8-13. 问题和答案
        if (questions.length > 0) {
            // 定义问题的X坐标位置
            const questionXPositions = [
                pixelToPt(120),  // 问题1
                pixelToPt(120),  // 问题2
                pixelToPt(740),  // 问题3
                pixelToPt(740),  // 问题4
                pixelToPt(1360)  // 问题5
            ];
            
            // 存储每列最后一个选项的Y坐标位置
            let lastOptionYPositions = {
                column1: 0, // 用于跟踪第一列(问题1)的最后位置
                column2: 0, // 用于跟踪第二列(问题3)的最后位置
            };
            
            // 首先渲染问题1、3、5（第一行问题）
            const firstRowQuestions = [0, 2, 4]; // 问题1、3、5的索引
            
            for (const i of firstRowQuestions) {
                if (i < questions.length && questions[i]) {
                    const currentX = questionXPositions[i];
                    const currentY = articleEndY + pixelToPt(130); // 所有第一行问题的起始Y坐标相同
                    
                    // 渲染问题文本
                    doc.font('Helvetica-Bold')
                       .fontSize(pixelToPt(36))
                       .text(`${i+1}. ${questions[i].QuestionEnglish || `Question ${i+1}`}`, 
                             currentX, currentY, {
                           width: pixelToPt(540),
                           align: 'left'
                       });
                    
                    // 获取问题文本渲染后的Y坐标位置
                    const questionEndY = doc.y;
                    
                    // 选项起始位置 = 问题结束位置 + 20像素间距
                    let optionY = questionEndY + pixelToPt(28);
                    
                    // 渲染选项
                    const options = questions[i].OptionsEnglish || [];
                    const optionLabels = ['A', 'B', 'C', 'D'];
                    
                    // 设置选项标签宽度和选项总宽度
                    const labelWidth = pixelToPt(40); // 标签(A./B./C./D.)的宽度
                    const totalWidth = pixelToPt(496); // 选项的总宽度
                    const contentWidth = totalWidth - labelWidth; // 选项内容的宽度
                    
                    options.forEach((opt, index) => {
                        if (index < optionLabels.length) {
                            // 提取选项内容，移除可能存在的标签前缀
                            let optionContent = opt.replace(/^[A-D]\.\s*/, '');
                            
                            // 渲染选项标签(A./B./C./D.)
                            doc.font('Helvetica')
                               .fontSize(pixelToPt(36))
                               .text(`${optionLabels[index]}.`, currentX, optionY, {
                                   width: labelWidth,
                                   align: 'left'
                               });
                            
                            // 渲染选项内容，确保折行时与内容第一行对齐
                            doc.font('Helvetica')
                               .fontSize(pixelToPt(36))
                               .text(optionContent, currentX + labelWidth, optionY, {
                                   width: contentWidth,
                                   align: 'left'
                               });
                            
                            // 更新选项Y坐标，为下一个选项做准备
                            // 获取当前位置，确保下一个选项在当前选项完全渲染后的位置
                            optionY = doc.y + pixelToPt(8);
                        }
                    });
                    
                    // 保存该列最后一个选项的Y坐标
                    if (i === 0) {
                        lastOptionYPositions.column1 = doc.y;
                    } else if (i === 2) {
                        lastOptionYPositions.column2 = doc.y;
                    }
                }
            }
            
            // 然后渲染问题2和4（第二行问题）
            if (questions.length > 1 && questions[1]) {
                // 问题2位于问题1的选项下方60像素处
                const question2Y = lastOptionYPositions.column1 + pixelToPt(75);
                
                doc.font('Helvetica-Bold')
                   .fontSize(pixelToPt(36))
                   .text(`2. ${questions[1].QuestionEnglish || "Question 2"}`, 
                         questionXPositions[1], question2Y, {
                       width: pixelToPt(540),
                       align: 'left'
                   });
                
                // 获取问题文本渲染后的Y坐标位置
                const questionEndY = doc.y;
                
                // 选项起始位置 = 问题结束位置 + 20像素间距
                let optionY = questionEndY + pixelToPt(28);
                
                // 渲染选项
                const options = questions[1].OptionsEnglish || [];
                const optionLabels = ['A', 'B', 'C', 'D'];
                
                // 设置选项标签宽度和选项总宽度
                const labelWidth = pixelToPt(40); // 标签(A./B./C./D.)的宽度
                const totalWidth = pixelToPt(496); // 选项的总宽度
                const contentWidth = totalWidth - labelWidth; // 选项内容的宽度
                
                options.forEach((opt, index) => {
                    if (index < optionLabels.length) {
                        // 提取选项内容，移除可能存在的标签前缀
                        let optionContent = opt.replace(/^[A-D]\.\s*/, '');
                        
                        // 渲染选项标签(A./B./C./D.)
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(`${optionLabels[index]}.`, questionXPositions[1], optionY, {
                               width: labelWidth,
                               align: 'left'
                           });
                        
                        // 渲染选项内容，确保折行时与内容第一行对齐
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(optionContent, questionXPositions[1] + labelWidth, optionY, {
                               width: contentWidth,
                               align: 'left'
                           });
                        
                        // 更新选项Y坐标，为下一个选项做准备
                        optionY = doc.y + pixelToPt(8);
                    }
                });
            }
            
            if (questions.length > 3 && questions[3]) {
                // 问题4位于问题3的选项下方60像素处
                const question4Y = lastOptionYPositions.column2 + pixelToPt(75);
                
                doc.font('Helvetica-Bold')
                   .fontSize(pixelToPt(36))
                   .text(`4. ${questions[3].QuestionEnglish || "Question 4"}`, 
                         questionXPositions[3], question4Y, {
                       width: pixelToPt(540),
                       align: 'left'
                   });
                
                // 获取问题文本渲染后的Y坐标位置
                const questionEndY = doc.y;
                
                // 选项起始位置 = 问题结束位置 + 20像素间距
                let optionY = questionEndY + pixelToPt(28);
                
                // 渲染选项
                const options = questions[3].OptionsEnglish || [];
                const optionLabels = ['A', 'B', 'C', 'D'];
                
                // 设置选项标签宽度和选项总宽度
                const labelWidth = pixelToPt(40); // 标签(A./B./C./D.)的宽度
                const totalWidth = pixelToPt(496); // 选项的总宽度
                const contentWidth = totalWidth - labelWidth; // 选项内容的宽度
                
                options.forEach((opt, index) => {
                    if (index < optionLabels.length) {
                        // 提取选项内容，移除可能存在的标签前缀
                        let optionContent = opt.replace(/^[A-D]\.\s*/, '');
                        
                        // 渲染选项标签(A./B./C./D.)
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(`${optionLabels[index]}.`, questionXPositions[3], optionY, {
                               width: labelWidth,
                               align: 'left'
                           });
                        
                        // 渲染选项内容，确保折行时与内容第一行对齐
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(optionContent, questionXPositions[3] + labelWidth, optionY, {
                               width: contentWidth,
                               align: 'left'
                           });
                        
                        // 更新选项Y坐标，为下一个选项做准备
                        optionY = doc.y + pixelToPt(8);
                    }
                });
            }
            
            // 问题5保持原位置不变
            if (questions.length > 4 && questions[4]) {
                const currentX = questionXPositions[4];
                const currentY = articleEndY + pixelToPt(130);
                
                doc.font('Helvetica-Bold')
                   .fontSize(pixelToPt(36))
                   .text(`5. ${questions[4].QuestionEnglish || "Question 5"}`, 
                         currentX, currentY, {
                       width: pixelToPt(540),
                       align: 'left'
                   });
                
                const questionEndY = doc.y;
                
                let optionY = questionEndY + pixelToPt(28);
                
                // 渲染选项
                const options = questions[4].OptionsEnglish || [];
                const optionLabels = ['A', 'B', 'C', 'D'];
                
                // 设置选项标签宽度和选项总宽度
                const labelWidth = pixelToPt(40); // 标签(A./B./C./D.)的宽度
                const totalWidth = pixelToPt(496); // 选项的总宽度
                const contentWidth = totalWidth - labelWidth; // 选项内容的宽度
                
                options.forEach((opt, index) => {
                    if (index < optionLabels.length) {
                        // 提取选项内容，移除可能存在的标签前缀
                        let optionContent = opt.replace(/^[A-D]\.\s*/, '');
                        
                        // 渲染选项标签(A./B./C./D.)
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(`${optionLabels[index]}.`, currentX, optionY, {
                               width: labelWidth,
                               align: 'left'
                           });
                        
                        // 渲染选项内容，确保折行时与内容第一行对齐
                        doc.font('Helvetica')
                           .fontSize(pixelToPt(36))
                           .text(optionContent, currentX + labelWidth, optionY, {
                               width: contentWidth,
                               align: 'left'
                           });
                        
                        // 更新选项Y坐标，为下一个选项做准备
                        optionY = doc.y + pixelToPt(8);
                    }
                });
            }
        }

        // 14. 虚线
        const lastContentY = doc.page.height - pixelToPt(190);
        // doc.rect(pixelToPt(120), lastContentY, 
        //         pixelToPt(1630), pixelToPt(10))
        //    .fill('#D2D2D2');
        doc.strokeColor('#D2D2D2')
           .dash(pixelToPt(20), { space: pixelToPt(28) }) // 设置虚线样式：宽20像素，间隔20像素
           .lineWidth(pixelToPt(10)) // 线高10像素
           .moveTo(pixelToPt(120), lastContentY)
           .lineTo(pixelToPt(120) + pixelToPt(1630), lastContentY)
           .stroke()
           .undash(); // 重置虚线样式

        // 15-19. 答案和底部信息
        doc.font('Helvetica-Bold') // 使用Helvetica-Bold作为Semibold替代
           .fontSize(pixelToPt(36))
           .fillColor('black'); // 重置颜色为黑色
        
        const answersY = doc.page.height - pixelToPt(144);
        
        // 获取问题答案
        const answers = [];
        if (questions.length > 0) {
            for (let i = 0; i < Math.min(questions.length, 5); i++) {
                const answer = questions[i].Answer || "";
                answers.push(`${i+1}. ${answer}`);
            }
        }
        
        // 显示答案（如果存在）
        const answerPositions = [120, 262, 411, 561, 711];
        for (let i = 0; i < Math.min(answers.length, 5); i++) {
            doc.text(answers[i], pixelToPt(answerPositions[i]), answersY+2, {
                width: pixelToPt(100),
                align: 'left'
            });
        }

        // 20-21. 应用名称
        doc.font('ChineseFont')
           .fontSize(pixelToPt(36))
           .text("语境背单词（微信小程序）", pixelToPt(1338), answersY,{
               width: pixelToPt(440),
               align: 'right'
           });
        
        // 添加二维码图片
        try {
            // 计算图片位置：距离右边120像素，距离底部100像素
            // 由于PDFKit使用左上角坐标系，需要计算左上角坐标
            const qrCodeWidth = pixelToPt(200);
            const qrCodeHeight = pixelToPt(200);
            const qrCodeX = doc.page.width - pixelToPt(120) - qrCodeWidth; // 右边距离转换为左边距离
            const qrCodeY = doc.page.height - pixelToPt(100) - qrCodeHeight; // 底部距离转换为顶部距离
            
            // 添加二维码图片
            doc.image('./public/images/acode/YJBDC_QRCode.png', qrCodeX, qrCodeY, {
                width: qrCodeWidth,
                height: qrCodeHeight
            });
            console.log("QR Code added successfully");
        } catch (imgError) {
            console.error("Error adding QR Code image:", imgError);
        }
        

        // 结束PDF生成
        doc.end();

        // 等待PDF生成完成
        const pdfBuffer = await new Promise((resolve) => {
            doc.on('end', () => {
                resolve(Buffer.concat(chunks));
            });
        });

        let filename="语境背单词_"+moment().format("YYMMDD_HHmm");
        // 设置响应头
        ctx.set('Content-Type', 'application/pdf');
        
        // 使用ASCII文件名作为主文件名，确保兼容性
        const asciiFilename = 'yjbdc_' + moment().format("YYMMDD_HHmm") + '.pdf';
        
        // 对中文文件名进行URL编码，用于filename*参数
        const encodedFilename = encodeURIComponent(filename + '.pdf');
        
        // 设置Content-Disposition头部，使用标准格式
        // 首先提供ASCII文件名，然后提供UTF-8编码的文件名
        ctx.set('Content-Disposition', `attachment; filename=${asciiFilename}; filename*=UTF-8''${encodedFilename}`);
        
        ctx.body = pdfBuffer;

    } catch (error) {
        console.error("Error generating PDF:", error);
        ctx.status = 500;
        ctx.body = { error: "Failed to generate PDF" };
    }
}

//生成二维码
export async function BuildYJBDCQRCode(ctx) {
    try {
        // 获取微信访问令牌
        const tokenUrl = `https://api.weixin.qq.com/cgi-bin/token?appid=${config.wx.yjbdc_appid}&secret=${config.wx.yjbdc_appsecret}&grant_type=client_credential`;
        
        const tokenResponse = await axios.get(tokenUrl);
        const tokenData = tokenResponse.data;
        
        if (!tokenData || !tokenData.access_token) {
            ctx.status = 400;
            ctx.body = { errcode: 101, errStr: '获取微信访问令牌失败' };
            return;
        }
        
        const accessToken = tokenData.access_token;
        
        // 生成小程序码
        const qrCodeUrl = `https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=${accessToken}`;
        const path = './public/images/acode/';
        const imageUrl = 'YJBDC_QRCode.png';
        const fullPath = path + imageUrl;
        
        // 确保目录存在
        if (!fs.existsSync(path)) {
            fs.mkdirSync(path, { recursive: true });
        }
        
        const postData = {
            width: 280,
            scene: "SourceID=187"
        };
        
        // 使用axios获取二维码并保存到文件
        const qrCodeResponse = await axios({
            method: 'POST',
            url: qrCodeUrl,
            data: postData,
            responseType: 'stream'
        });
        
        // 创建写入流
        const writer = fs.createWriteStream(fullPath);
        
        // 将响应数据写入文件
        qrCodeResponse.data.pipe(writer);
        
        // 返回成功响应
        ctx.body = { errcode: 10000, message: "二维码生成请求已发送" };
        
        // 处理文件写入完成事件
        writer.on('finish', () => {
            console.log("二维码生成成功:", fullPath);
        });
        
        // 处理错误
        writer.on('error', (err) => {
            console.error("二维码文件写入失败:", err);
        });
        
    } catch (error) {
        console.error("生成二维码失败:", error);
        ctx.status = 500;
        ctx.body = { 
            errcode: 500, 
            errStr: '生成二维码失败', 
            error: error.message 
        };
    }
}

export async function YJBDC_Articles_Admin(ctx) {
    console.log("yjbdc_articles");
    const data = await fsPromises.readFile("./public/mg/yjbdc_articles.html");
    ctx.body = data.toString();
};