using HTEXLib.COMM.Helpers;
using HTEXLib.DOCX.Models;
using HTEXLib.Helpers.ShapeHelpers;
using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace HTEXLib.Translator
{
    public class HTML2ITEMV2Translator
    {
        public const string Answer = "Answer";
        public const string Analysis = "Analysis";
        public const string Ended = "Ended";
        public const string Point = "Point";
        public const string Score = "Score";
        public const string Summary = "Summary";
        public const string Filed = "Filed";
        public const string Level = "Level";
        public LangConfig langConfig { get; set; }
        public HtmlDocument doc { get; set; } = new HtmlDocument();
        public string[] optionsKeys { get; set; }
        public Dictionary<string, string[]> dict { get; set; }
        public string[] Fileds { get; set; }
        public List<LangConfig>? _langConfigs { get; set; } = new List<LangConfig>();
        public HTML2ITEMV2Translator(string configPath)
        {
            FileStream fs = new FileStream(configPath+ "/LangConfig.json", System.IO.FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            StreamReader sr = new StreamReader(fs, System.Text.Encoding.UTF8);
            string line;
            StringBuilder builder = new StringBuilder();
            while ((line = sr.ReadLine()) != null)
            {
                builder.Append(line.ToString());
            }
            sr.Close();
            string text = builder.ToString();
            _langConfigs = JsonSerializer.Deserialize<List<LangConfig>>(text); 
        }

        /// <summary>
        /// 处理标签中以及题型标签中包含的空格字符
        /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        public string BlankProcess(string html)
        {
            string ans = langConfig.Item.Start + langConfig.Item.Answer + langConfig.Item.End;
            string als = langConfig.Item.Start + langConfig.Item.Analysis + langConfig.Item.End;
            string end = langConfig.Item.Start + langConfig.Item.Ended + langConfig.Item.End;
            string pot = langConfig.Item.Start + langConfig.Item.Point + langConfig.Item.End;
            string scr = langConfig.Item.Start + langConfig.Item.Score + langConfig.Item.End;
            string lvl = langConfig.Item.Start + langConfig.Item.Level + langConfig.Item.End;
            foreach (var filed in Fileds)
            {
                var fld=  langConfig.Item.Start + filed + langConfig.Item.End;
                string[] fldarry = fld.Select(s => s.ToString()).ToArray();
                string fldReg = string.Join("\\s*", fldarry);
                html = Regex.Replace(html, fldReg, fld);
            }
            string[] ansarry = ans.Select(s => s.ToString()).ToArray();
            string[] alsarry = als.Select(s => s.ToString()).ToArray();
            string[] endarry = end.Select(s => s.ToString()).ToArray();
            string[] potarry = pot.Select(s => s.ToString()).ToArray();
            string[] scrarry = scr.Select(s => s.ToString()).ToArray();
            string[] lvlarry = lvl.Select(s => s.ToString()).ToArray();
            string ansReg = string.Join("\\s*", ansarry);
            string alsReg = string.Join("\\s*", alsarry);
            string endReg = string.Join("\\s*", endarry);
            string potReg = string.Join("\\s*", potarry);
            string scrReg = string.Join("\\s*", scrarry);
            string lvlReg = string.Join("\\s*", lvlarry);
            html = Regex.Replace(html, ansReg, ans);
            html = Regex.Replace(html, alsReg, als);
            html = Regex.Replace(html, endReg, end);
            html = Regex.Replace(html, potReg, pot);
            html = Regex.Replace(html, scrReg, scr);
            html = Regex.Replace(html, lvlReg, lvl);
            string blankReg = "\\s*";
            foreach (string value in langConfig.Item.Type.Values)
            {
                //string tag = langConfig.Item.Start + "\\s*" + "\\d+\\s*" + string.Join("\\s*", value.Select(s => s.ToString()).ToArray()) + "\\s*" + langConfig.Item.End;
                string tag = $"{langConfig.Item.Start}\\s*\\d+\\s*{string.Join("\\s*", value.Select(s => s.ToString()).ToArray())}\\s*{langConfig.Item.End}";
                var m = Regex.Match(html, tag);
                while (m.Success)
                {
                    string blankStr = Regex.Replace(m.Value, blankReg, "");
                    html = html.Replace(m.Value, blankStr);
                    m = m.NextMatch();
                }
            }
            return html;
        }

        public List<DOCX.Models.ItemInfo> Translate(string html, JsonElement lang )
        {
            string mathjax = "<script type=\"text/javascript\" src=\"http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML\"></script>";
            html = html.Replace(mathjax, "");
            //去除class 以及span标签"
            string classpattern = "class=\"([^\"]*)\"";
            html = Regex.Replace(html, classpattern, "");
            string pattern = "<span([^>]{0,})>";
            html = Regex.Replace(html, pattern, "");
            html = html.Replace(" close=\"\" separators=\" | \">", "");
            html = html.Replace("\t", " ").Replace("<span>", "").Replace("</span>", "").Replace("dir=\"ltr\"", "");
            doc.LoadHtml(html);
            //初始化语言配置
            langConfig = null;
            var configArray = Regex.Split(doc.DocumentNode.InnerText, "{([\\S]*?)}");
            for (int index = 1; index < configArray.Length; index++) {
                if (index % 2 == 1) {
                    langConfig = _langConfigs.Where(x => x.Lang.Equals(configArray[index],StringComparison.CurrentCultureIgnoreCase) ).FirstOrDefault();
                    if (langConfig != null) {
                        break;
                    }
                }
            }
            if (langConfig == null && lang.ValueKind== JsonValueKind.String) {
                langConfig = _langConfigs.Where(x => x.Lang == lang.GetString()).FirstOrDefault();
            }
            if (langConfig == null) {
                throw new Exception();
            }
            //初始化标签配置
            Fileds = langConfig.Item.Filed.Split('|');
            dict = new Dictionary<string, string[]>
            {
                { langConfig.Item.Answer, new string[] { Answer } },
                { langConfig.Item.Analysis, new string[] { Analysis } },
                { langConfig.Item.Ended, new string[] { Ended } },
                { langConfig.Item.Point, new string[] { Point } },
                { langConfig.Item.Score, new string[] { Score } },
                { langConfig.Item.Level, new string[] { Level } }

            };
            foreach (string key in langConfig.Item.Type.Keys)
            {
                dict.Add(langConfig.Item.Type[key], new string[] { Summary, key });
            }
            foreach (var filed in Fileds)
            {
                dict.Add(filed, new string[] { Filed, $"{Array.IndexOf(Fileds, filed)}" });
            }
            optionsKeys = langConfig.Item.Options.Select(s => s.ToString()).ToArray();
            //处理 标签中包含的空格字符
            html = BlankProcess(html);
            html = Regex.Replace(html, "{" + langConfig.Lang + "}","", RegexOptions.IgnoreCase);
            var array = Regex.Split(html, "{([\\S]*?)}");
            List<KeyValuePair<int[], List<string>>> composeKeys = new List<KeyValuePair<int[], List<string>>>();
            //List<string>
            //处理综合题 
            for (int index = 1; index < array.Length; index++)
            {
                 
                var tagValue = BlankTag(array[index]);
                tagValue = Regex.Replace(tagValue, @"\d", "");
                if (dict.TryGetValue(tagValue, out string[] keyInfo))
                {
                    if (keyInfo[0] == Summary && keyInfo[1].Equals("compose"))
                    {
                        var curr = index;
                        List<string> comsArray = new List<string>() ;
                        for (int composeIndex = index + 1; composeIndex < array.Length; composeIndex++) {
                            var conIndex = BlankTag(array[composeIndex]);
                            tagValue = Regex.Replace(tagValue, @"\d", "");
                            if (conIndex.Equals(langConfig.Item.Ended) || conIndex.Equals(tagValue + langConfig.Item.Ended)) {
                                comsArray.AddRange(array.ToList().GetRange(index+1, composeIndex - index-1));
                                index = composeIndex + 1;
                                break;
                            }
                        }
                        //int[0]综合题开始标签位置,int[1]综合题结束标签位置,int[2]综合题第一个小题的开始标签位置
                        KeyValuePair<int[], List<string>> coms = new KeyValuePair<int[], List<string>>(new int[] { curr, index }, comsArray);
                        composeKeys.Add(coms);
                    }
                }
            }
            List<KeyValuePair<int[], List<ItemInfo>>> composeList = new List<KeyValuePair<int[], List<ItemInfo>>>();
            foreach(var conskey in composeKeys) {
                List<DOCX.Models.ItemInfo> consInner = ConvertTest(conskey.Value.ToArray(), null);
                int stIndex = conskey.Key[0]+1;
                if (consInner.IsNotEmpty())
                {
                    stIndex = consInner[0].order<=0? conskey.Key[0]+consInner[0].order:stIndex;
                }
                KeyValuePair<int[], List<ItemInfo>> innerComposeItem = new KeyValuePair<int[], List<ItemInfo>>(new int[] { conskey.Key[0], conskey.Key[1], stIndex }, consInner);
                composeList.Add(innerComposeItem);
            }
            List<DOCX.Models.ItemInfo> tests= ConvertTest(array, composeList);
            return tests;
        }

        private  string BlankTag(string tagHtml) {
            //去掉标签中的Html
            doc.LoadHtml(tagHtml);
            var tagValue = doc.DocumentNode.InnerText.Replace("{", "").Replace("}", "")
                        .Replace("\n", "").Replace(" ", "").Replace("\t", "").Replace("\r", "")
                        .Replace("&nbsp;", "").Replace("&emsp;", "").Replace("&emsp;", "");
           // tagValue = Regex.Replace(tagValue, @"\d", "");
            tagValue = Regex.Replace(tagValue, @"\s", "");
            return tagValue;
        }
        public List<DOCX.Models.ItemInfo> ConvertTest(string[] array, List<KeyValuePair<int[], List<ItemInfo>>> composeList) {
            List<DOCX.Models.ItemInfo> tests = new List<DOCX.Models.ItemInfo>();
            //内容零时变量，追加完成后重新实例化  new StringBuilder()
            StringBuilder content = new StringBuilder();
            //告知遇到新标签，内容需要重新初始化实例
            DOCX.Models.ItemInfo test=null;
            string openTag = "";
            string openTagVal = "";
            bool openFlag = false;
            for (int index = 1; index < array.Length; index++) {
                if (index % 2 == 1)
                {
                    //去掉标签中的{} 空格换行制表符及Html空格数字等
                    var tagValue = BlankTag(array[index]);
                    tagValue = Regex.Replace(tagValue, @"\d", "");
                    if (dict.TryGetValue(tagValue, out string[] keyInfo))
                    {
                        switch ( keyInfo[0] ) {
                            case Summary:
                                if (!string.IsNullOrEmpty(openTag) && openFlag && test != null)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                if (test != null)
                                {
                                    tests.Add(test);
                                }
                                //下列代码不能调整顺序
                                if (keyInfo[1].Equals("compose"))
                                {
                                    var id = System.Guid.NewGuid().ToString();
                                    var compose = new ItemInfo { type = keyInfo[1],objective=false,order=index,id=id };
                                    if (composeList.IsNotEmpty())
                                    {
                                        var childItem = composeList.Where(x => x.Key[0] == index).FirstOrDefault();
                                        childItem.Value.ForEach(x => x.pid = id);
                                        compose.children = childItem.Value;
                                        var ques= array.ToList().GetRange(childItem.Key[0]+1, childItem.Key[2]- childItem.Key[0]);
                                        compose.question= string.Join("", ques);
                                        index = childItem.Key[1] - 1;
                                    }
                                    tests.Add(compose);
                                    openTag = "";
                                    openTagVal = "";
                                    openFlag = false;
                                    test = null;
                                }
                                else {
                                    var id = System.Guid.NewGuid().ToString();
                                    test = new ItemInfo() { type = keyInfo[1], order = index, id = id };
                                    if (keyInfo[1].Equals("single") || keyInfo[1].Equals("multiple") || keyInfo[1].Equals("judge"))
                                    {
                                        test.objective = true;
                                    }
                                    else
                                    {
                                        test.objective = false;
                                    }
                                    openTag = Summary;
                                    openTagVal = tagValue;
                                    openFlag = true;
                                }
                                break;
                            case Answer: 
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Answer;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                            case Analysis:
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Analysis;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                            case Ended: 
                                break;
                            case Point:
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Point;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                            case Score:
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Score;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                            case Level:
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Level;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                            case Filed:
                                //下列代码不能调整顺序
                                if (!string.IsNullOrEmpty(openTag) && openFlag)
                                {
                                    DoOpenTag(openTag, openTagVal, openFlag, content, test);
                                    content = new StringBuilder();
                                }
                                openTag = Filed;
                                openTagVal = tagValue;
                                openFlag = true;
                                break;
                        }
                    }
                    //如果不是标签内的则累加到内容上
                    else {
                        content.Append(array[index]);
                    }
                }
                else {
                    //偶数序列为内容
                    content.Append(array[index]);
                }
            }
            if (test != null)
            {
                DoOpenTag(openTag, openTagVal, openFlag, content, test);
                tests.Add(test);
            }
            return tests;
        }
        public (List<CodeValue> options,string question) OptionProcess(string question) {
            List<CodeValue> options = new List<CodeValue>();
            string optsRgex = optionsKeys[0] + "\\s*(\\．|\\.|\\、|\\:|\\：)([\\s\\S]*?).*"; ;
            string optsHtml = Regex.Match(question, optsRgex).Value;
            //StringBuilder textImg = new StringBuilder();
            for (int i = 0; i < optionsKeys.Length - 1; i++)
            {
                string optRgex = optionsKeys[i] + "\\s*(\\．|\\.|\\、|\\:|\\：)([\\s\\S]*?)" + optionsKeys[i + 1] + "\\s*(\\．|\\.|\\、|\\:|\\：)";
                string optHtml = Regex.Match(optsHtml, optRgex).Value;
                if (string.IsNullOrWhiteSpace(optHtml)) {
                    optRgex = optionsKeys[i] + "\\s*(\\．|\\.|\\、|\\:|\\：).*";
                    optHtml = Regex.Match(optsHtml, optRgex).Value;
                }
                if (!string.IsNullOrEmpty(optHtml))
                {
                    optHtml = Regex.Replace(optHtml, optionsKeys[i + 1] + "\\s*(\\．|\\.|\\、|\\:|\\：)", "");
                    optHtml = optHtml.Substring(2, optHtml.Length - 2);
                    optHtml = HtmlHelper.DoUselessTag(optHtml);
                    optHtml = optHtml.TrimStart().TrimEnd();
                    //textImg.Append(HtmlHelper.DoTextImg(optHtml));
                    options.Add(new CodeValue { code = optionsKeys[i], value = optHtml });
                }
            }
            if (!string.IsNullOrWhiteSpace(optsHtml))
            {
                return (options, question.Replace(optsHtml, ""));
            }
            else {
                return (null, question);
            }
        }

        public void  DoOpenTag (string openTag,string openTagVal, bool openFlag, StringBuilder  content , DOCX.Models.ItemInfo test) {
            if (test != null) {
                switch (openTag) {
                    case Summary:
                        if (test.type.Equals("single") || test.type.Equals("multiple")|| test.type.Equals("judge"))
                        {
                            (List<CodeValue> options, string question) = OptionProcess(content.ToString());
                            test.option = options;
                            test.question = HtmlHelper.DoUselessTag(question) ;
                        }
                        else {
                            test.question = HtmlHelper.DoUselessTag(content.ToString());
                        }
                        break;
                    case Answer:
                        if (test.type.Equals("single") || test.type.Equals("multiple")|| test.type.Equals("judge"))
                        {
                            HashSet<string> ans = new HashSet<string>(); 
                            var anstr = BlankTag(content.ToString());
                            anstr.Select(s => s.ToString()).ToList().ForEach(x =>
                            {
                                ans.Add(x);
                            });
                            test.answer = ans.ToList();
                            if (test.type.Equals("judge")) {
                                string[] Judge = langConfig.Item.Judge.Split('|');
                                List<CodeValue> option = new List<CodeValue>() { new CodeValue { code = "A", value = Judge[0] }, new CodeValue { code = "B", value = Judge[1] } };
                                if (test.answer != null && test.answer.Count > 0)
                                {
                                    int index = 0;
                                    foreach (var j in Judge)
                                    {
                                        if (String.Equals(test.answer[0], j, StringComparison.CurrentCultureIgnoreCase))
                                        {
                                            test.answer[0] = option[index].code;
                                            test.option = option;
                                            break;
                                        }
                                        index += 1;
                                    }
                                }
                            }
                        }
                        else {
                            test.answer = new List<string>() { HtmlHelper.DoUselessTag(content.ToString()) };
                        }
                        break;
                    case Analysis:
                        test.explain  = HtmlHelper.DoUselessTag(content.ToString());
                        break;
                    case Ended: break;
                    case Point:
                        string Points =BlankTag(content.ToString());
                        if (!string.IsNullOrWhiteSpace(Points))
                        {
                            string[] ps = Regex.Split(Points, "\\．|\\.|\\、|\\:|\\：|\\,|\\，|\\；|\\;");
                            if (ps != null && ps.Length > 0)
                            {
                                test.knowledge = ps.Distinct().ToList();
                            }
                        }
                        break;
                    case Score:
                        //单选或多选,判断答案 脱html标签
                        string Scores = BlankTag(content.ToString());
                        //正则匹配数字  整数和小数点
                        var reg = "^[0-9]+(\\.?[0-9]+)?";
                        Match m1t = Regex.Match(Scores, reg);
                        double.TryParse(m1t.Value, out double sc);
                        test.score = sc;
                        break;
                    case Level:
                        //单选或多选,判断答案 脱html标签
                        string Levels = BlankTag(content.ToString());
                        //正则匹配数字  整数和小数点
                        var lelreg = "^[0-9]+(\\.?[0-9]+)?";
                        Match lelm1t = Regex.Match(Levels, lelreg);
                        int.TryParse(lelm1t.Value, out int lvl);
                        test.level = lvl;
                        break;
                    case Filed:
                        test.field = Array.IndexOf(Fileds, openTagVal) + 1;
                        break;
                }
            }
        }
    }
}