using HyperCube.Models;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Forms;
using Pullenti.Unitext;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using Console = HyperCube.Utils.AdvConsole;

namespace HyperCube.Pages
{
    public partial class Desktop : ComponentBase
    {
        [Inject]
        NavigationManager _navigationManager { get; set; }
        [Inject]
        AppData _appData { get; set; }

        const string STORAGE_FOLDER_NAME = "articles_storage";
        const long MAX_FILE_SIZE = 5120000; //bytes

        const string ACTIVE_BUTTON_CLASS = "btn_white tab-button active";
        const string ACTIVE_TAB_CLASS = "second-block__form visible";
        const string BUTTON_CLASS = "btn_white tab-button";
        const string TAB_CLASS = "second-block__form";

        string _uploadButtonClass = ACTIVE_BUTTON_CLASS;
        string _uploadTabClass = ACTIVE_TAB_CLASS;
        string _verifyButtonClass = BUTTON_CLASS;
        string _verifyTabClass = TAB_CLASS;
        string _otherButtonClass = BUTTON_CLASS;
        string _otherTabClass = TAB_CLASS;

        int _counter = 1;

        //string _event = "";
        string _status;
        //string _header;
        //string _storageFolderPath;
        MemoryStream _memoryStream;
        ModalInfo _modalInfo_error { get; set; }
        ModalLoading _modalLoading { get; set; }

        ArticleModel _articleClone = new();
        ArticleModel _article = new();

        UnitextDocument _document;

        protected override async Task OnInitializedAsync()
        {
            ///tmp
            await AppData.LoadArticles();
        }
        protected override void OnAfterRender(bool firstRender) => _counter = 1;

        void SwitchDesktopTab(int tabIndex)
        {
            switch(tabIndex)
            {
                case 0:
                    _uploadButtonClass = ACTIVE_BUTTON_CLASS;
                    _uploadTabClass = ACTIVE_TAB_CLASS;
                    _verifyButtonClass = BUTTON_CLASS;
                    _verifyTabClass = TAB_CLASS;
                    _otherButtonClass = BUTTON_CLASS;
                    _otherTabClass = TAB_CLASS;
                    break;
                case 1:
                    _uploadButtonClass = BUTTON_CLASS;
                    _uploadTabClass = TAB_CLASS;
                    _verifyButtonClass = ACTIVE_BUTTON_CLASS;
                    _verifyTabClass = ACTIVE_TAB_CLASS;
                    _otherButtonClass = BUTTON_CLASS;
                    _otherTabClass = TAB_CLASS;
                    break;
                case 2:
                    _uploadButtonClass = BUTTON_CLASS;
                    _uploadTabClass = TAB_CLASS;
                    _verifyButtonClass = BUTTON_CLASS;
                    _verifyTabClass = TAB_CLASS;
                    _otherButtonClass = ACTIVE_BUTTON_CLASS;
                    _otherTabClass = ACTIVE_TAB_CLASS;
                    break;
            }
        }

        async Task HandleUpload(InputFileChangeEventArgs e)
        {
            _modalLoading.Open();

            IBrowserFile file = e.File;
            if (file != null)
            {
                Stream stream = file.OpenReadStream(MAX_FILE_SIZE);
                _memoryStream = new();
                await stream.CopyToAsync(_memoryStream);
                _status = $"Finished loading {_memoryStream.Length} bytes from {file.Name}";
                Console.WriteLine(_status);

                /// calculating hash
                string hash = await CalculateHashSum(_memoryStream);
                Console.WriteLine($"Hash: {hash}");

                /// checking hash
                MySQLConnector dbCon = MySQLConnector.Instance();
                string stringSQL;
                stringSQL = $"SELECT COUNT(*) FROM articles WHERE file_hash='{hash}'";
                int count = await dbCon.SQLSelectCount(stringSQL);                

                if (count < 1)
                {
                    ReportModel report = _appData.Report;
                    report.FileName = file.Name;
                    report.FileSize = _memoryStream.Length.ToString();

                    _memoryStream.Position = 0;
                    byte[] content = _memoryStream.ToArray();

                    _document = UnitextService.CreateDocument(null, content, null);
                    if (_document.ErrorMessage != null)
                    {
                        // скорее всего, этот формат не поддерживается на данный момент
                        Console.WriteLine($"error, sorry: {_document.ErrorMessage}");

                        _memoryStream.Close();
                        stream.Close();
                        _modalLoading.Close();
                        _modalInfo_error.Open("Не удается прочитать документ, формат не поддерживается или файл поврежден.");

                        return;
                    }

                    // восстанавливаем имя исходного файла, извлечённого из ресурсов
                    _document.SourceFileName = file.Name;
                    for (int i = file.Name.Length - 7; i > 0; i--)
                    {
                        if (file.Name[i] == '.')
                        {
                            _document.SourceFileName = file.Name.Substring(i + 1);
                            break;
                        }
                    }

                    //// записываем результат в XML
                    //using (FileStream fs = new(doc.SourceFileName + ".xml", FileMode.Create, FileAccess.Write))
                    //{
                    //    XmlWriterSettings xmlParams = new();
                    //    xmlParams.Encoding = Encoding.UTF8;
                    //    xmlParams.Indent = true;
                    //    xmlParams.IndentChars = "  ";
                    //    using (XmlWriter xml = XmlWriter.Create(fs, xmlParams))
                    //    {
                    //        xml.WriteStartDocument();
                    //        doc.GetXml(xml);
                    //        xml.WriteEndDocument();
                    //    }
                    //}
                    //Console.WriteLine("XML write done");

                    // получаем плоский текст
                    string plainText = _document.GetPlaintextString(null);
                    if (plainText == null)
                        plainText = "Текст не выделен";                    

                    _articleClone = DocParse.GetBaseProperties(plainText);
                    _articleClone.Filename = file.Name;
                    _articleClone.HashSum = hash;
                    _article = (ArticleModel)_articleClone.Clone();

                    Console.WriteLine($"Initializing SDK Pullenti ver {Pullenti.Sdk.Version} ({Pullenti.Sdk.VersionDate})... ");
                    Pullenti.Sdk.InitializeAll();
                    //Console.WriteLine($"OK (by ... ms), version {Pullenti.Ner.ProcessorService.Version}");

                    List<string> npt_tokens = new();

                    // запускаем обработку на пустом процессоре (без анализаторов NER)
                    Pullenti.Ner.AnalysisResult are = Pullenti.Ner.ProcessorService.EmptyProcessor.Process(new Pullenti.Ner.SourceOfAnalysis(plainText), null, null);
                    System.Console.Write("Noun groups: ");
                    // перебираем токены
                    for (Pullenti.Ner.Token t = are.FirstToken; t != null; t = t.Next)
                    {
                        // выделяем именную группу с текущего токена
                        Pullenti.Ner.Core.NounPhraseToken npt = Pullenti.Ner.Core.NounPhraseHelper.TryParse(t, Pullenti.Ner.Core.NounPhraseParseAttr.No, 0, null);
                        // не получилось
                        if (npt == null)
                            continue;
                        // получилось, выводим в нормализованном виде
                        //System.Console.Write($"[{npt.GetSourceText()}=>{npt.GetNormalCaseText(null, Pullenti.Morph.MorphNumber.Singular, Pullenti.Morph.MorphGender.Undefined, false)}] ");
                        report.NounGroups += $"[{npt.GetSourceText()}=>{npt.GetNormalCaseText(null, Pullenti.Morph.MorphNumber.Singular, Pullenti.Morph.MorphGender.Undefined, false)}] "; 

                        npt_tokens.Add(npt.GetNormalCaseText(null, Pullenti.Morph.MorphNumber.Singular, Pullenti.Morph.MorphGender.Undefined, false));

                        // указатель на последний токен именной группы
                        t = npt.EndToken;
                    }
                    using (Pullenti.Ner.Processor proc = Pullenti.Ner.ProcessorService.CreateProcessor())
                    {
                        // анализируем текст
                        Pullenti.Ner.AnalysisResult ar = proc.Process(new Pullenti.Ner.SourceOfAnalysis(plainText), null, null);
                        // результирующие сущности
                        //Console.WriteLine("\r\n==========================================\r\nEntities: ");
                        foreach (Pullenti.Ner.Referent en in ar.Entities)
                        {
                            //Console.WriteLine($"{en.TypeName}: {en}");
                            report.Entities += $"{en.TypeName}: {en}\r\n";
                            foreach (Pullenti.Ner.Slot s in en.Slots)
                            {
                                //Console.WriteLine($"   {s.TypeName}: {s.Value}");
                                report.Entities += $"   {s.TypeName}: {s.Value}<br>";
                            }
                        }
                        // пример выделения именных групп
                        //Console.WriteLine("\r\n==========================================\r\nNoun groups: ");
                        for (Pullenti.Ner.Token t = ar.FirstToken; t != null; t = t.Next)
                        {
                            // токены с сущностями игнорируем
                            if (t.GetReferent() != null)
                                continue;
                            // пробуем создать именную группу
                            Pullenti.Ner.Core.NounPhraseToken npt = Pullenti.Ner.Core.NounPhraseHelper.TryParse(t, Pullenti.Ner.Core.NounPhraseParseAttr.AdjectiveCanBeLast, 0, null);
                            // не получилось
                            if (npt == null)
                                continue;
                            //Console.WriteLine(npt.ToString());
                            report.EntitiesNounGroups += $"{npt}<br>";
                            // указатель перемещаем на последний токен группы
                            t = npt.EndToken;
                        }
                    }
                    using (Pullenti.Ner.Processor proc = Pullenti.Ner.ProcessorService.CreateSpecificProcessor(Pullenti.Ner.Keyword.KeywordAnalyzer.ANALYZER_NAME))
                    {
                        Pullenti.Ner.AnalysisResult ar = proc.Process(new Pullenti.Ner.SourceOfAnalysis(plainText), null, null);
                        //Console.WriteLine("\r\n==========================================\r\nKeywords1: ");
                        foreach (Pullenti.Ner.Referent en in ar.Entities)
                        {
                            if (en is Pullenti.Ner.Keyword.KeywordReferent)
                                //Console.WriteLine(en.ToString());
                                report.Keywords1 += $"{en}<br>";
                        }
                        //Console.WriteLine("\r\n==========================================\r\nKeywords2: ");
                        for (Pullenti.Ner.Token t = ar.FirstToken; t != null; t = t.Next)
                        {
                            if (t is Pullenti.Ner.ReferentToken)
                            {
                                Pullenti.Ner.Keyword.KeywordReferent kw = t.GetReferent() as Pullenti.Ner.Keyword.KeywordReferent;
                                if (kw == null)
                                    continue;
                                string kwstr = Pullenti.Ner.Core.MiscHelper.GetTextValueOfMetaToken(t as Pullenti.Ner.ReferentToken, Pullenti.Ner.Core.GetTextAttr.FirstNounGroupToNominativeSingle | Pullenti.Ner.Core.GetTextAttr.KeepRegister);
                                //Console.WriteLine($"{kwstr} = {kw}");
                                report.Keywords2 += $"{kwstr} = {kw}<br>";
                            }
                        }
                    }                   
                    
                    int res = (from x in npt_tokens
                               select x).Distinct().Count();

                    Console.WriteLine($"npt_tokens.count={npt_tokens.Count}, distinct.Count={res}");
                    Console.WriteLine("Analysis is over!");

                    var query = from x in npt_tokens
                            group x by x into g
                            let count1 = g.Count()
                            orderby count1 descending
                            select new { Name = g.Key, Count = count1 };
                    foreach (var result in query)
                    {
                        report.NounGroupsSorted += $"{result.Name}, Count: {result.Count}<br>";
                        //Console.WriteLine($"Name: {result.Name}, Count: {result.Count}");                        
                    }

                    _navigationManager.NavigateTo("report");
                }
                else
                {
                    _status = $"File duplicate founded, hash: {hash}.";
                    Console.WriteLine(_status);

                    _document = null;
                    _memoryStream.Close();             
                    _modalInfo_error.Open("Загрузка не удалась, такой документ уже есть в системе.");
                }

                file = null;
                stream.Close();
            }

            _modalLoading.Close();
        }

        private async Task SaveDocument()
        {
            Console.WriteLine($"SaveDocument, docID: {DocID}.");

            _modalLoading.Open();

            /// all is fine, continue
            MySQLConnector dbCon = MySQLConnector.Instance();
            long id;
            string stringSQL;

            if (DocID > 0)
            {
                id = DocID;
                stringSQL = $"UPDATE articles " +
                    $"SET filename='{_article.Filename}', article_name='{_article.Name}', authors='{_article.Authors}', " +
                        $"date_publish='{_article.PublishDate:yyyy-MM-dd}', annotation='{_article.Annotation}', " +
                        $"keywords='{_article.Keywords}', rating={_article.Rating}, file_hash='{_article.HashSum}' " +
                    $"WHERE id={DocID}";
                await dbCon.SQLInsert(stringSQL);
            }
            else
            {
                stringSQL = $"INSERT INTO articles (filename, article_name, authors, date_publish, annotation, keywords, file_hash) " +
                    $"VALUES ('{_article.Filename}', '{_article.Name}', '{_article.Authors}', '{_article.PublishDate:yyyy-MM-dd}'," +
                        $"'{_article.Annotation}', '{_article.Keywords}', '{_article.HashSum}')";
                id = await dbCon.SQLInsert(stringSQL);
            }

            /// tmp
            int action_type = DocID > 0 ? 2 : 1;

            stringSQL = $"INSERT INTO actions_history (article_id, action_type, acc_id) " +
                $"VALUES ('{id}', '{action_type}', '{currentAcc.UUID}')";
            await dbCon.SQLInsert(stringSQL);

            Dictionary<string, PropertyInfo> propDict = Compare.SimpleCompare<ArticleModel>(_article, _articleClone);
            foreach (KeyValuePair<string, PropertyInfo> prop in propDict)
            {
                //Console.WriteLine($"property name: {prop.Key}, value: {prop.Value.GetValue(articleModel, null)}");

                stringSQL = $"INSERT INTO articles_edit_log (article_id, acc_id, field_name, field_prevvalue, field_newvalue) " +
                    $"VALUES ('{id}', '{currentAcc.UUID}', '{prop.Key}', '{prop.Value.GetValue(_articleClone, null)}', '{prop.Value.GetValue(_article, null)}')";
                await dbCon.SQLInsert(stringSQL);
            }

            if (DocID > 0)
            {
                _status = propDict.Count > 0 ? "All changes saved, article has veryfied." : "Article verifyed without any changes.";
                //transactionId = await Verify();
                //Console.WriteLine("transactionId found " + transactionId);

                ///tmp
                //editsCount = await article.GetEditsCount(currentAcc.UUID);
                //modalInfo_transac.Open();
            }
            else
            {
                // получаем html
                GetHtmlParam htmlParams = new();
                htmlParams.OutHtmlAndBodyTags = true;
                string html = _document.GetHtmlString(htmlParams);
                string fullpath;
                string htmldirectorypath;
                string docdirectorypath;
#if DEBUG
                htmldirectorypath = Path.Combine(Environment.CurrentDirectory, "wwwroot", STORAGE_FOLDER_NAME, "html");
                docdirectorypath = Path.Combine(Environment.CurrentDirectory, "wwwroot", STORAGE_FOLDER_NAME, "source");
#else
                htmldirectorypath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot", STORAGE_FOLDER_NAME, "html");
                docdirectorypath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot", STORAGE_FOLDER_NAME, "source");
#endif
                ///saving html
                fullpath = Path.Combine(htmldirectorypath, _document.SourceFileName + ".html");
                Console.WriteLine($"Saving file [{fullpath}]");
                Directory.CreateDirectory(htmldirectorypath);
                File.WriteAllBytes(fullpath, Encoding.UTF8.GetBytes(html));

                ///saving original files
                fullpath = Path.Combine(docdirectorypath, $"{id}_{_article.Filename}");
                Directory.CreateDirectory(docdirectorypath);
                FileStream fs = new(fullpath, FileMode.Create, FileAccess.Write);
                _memoryStream.Position = 0;
                await _memoryStream.CopyToAsync(fs);

                _status = $"User has saved new article data: [{id}_{_article.Filename}], memory size:{_memoryStream.Length}b, file size: {fs.Length}b";
                Console.WriteLine(_status);
                _memoryStream.Close();
                fs.Close();                

                //bool confirmed = await JsRuntime.InvokeAsync<bool>("confirm", "Хотите загрузить еще статью?");
                //if (confirmed)
                //    NavigationManager.NavigateTo("docedit", true);
                //else
                //    NavigationManager.NavigateTo("");
            }

            /// reloading articles
            await AppData.LoadArticles();
        }

        async Task<string> CalculateHashSum(MemoryStream ms)
        {
            MD5CryptoServiceProvider md5Provider = new();
            ms.Position = 0;
            byte[] hash = await md5Provider.ComputeHashAsync(ms);
            return Convert.ToBase64String(hash);
        }

        List<string> ValidateForm<T>(T obj)
        {
            var props = typeof(T).GetProperties().Where(pi => Attribute.IsDefined(pi, typeof(RequiredAttribute)));
            List<string> result = new();
            foreach (var prop in props)
            {
                var val = prop.GetValue(obj, null);
                if (val == null || val?.ToString().Length == 0)
                    result.Add(prop.Name);

                //Console.WriteLine($"Required field '{prop.Name}' is not filled.");
            }
            return result;
        }

        static string GetDisplayName(Enum enumValue)
        {
            return enumValue.GetType()
                            .GetMember(enumValue.ToString())
                            .First()
                            .GetCustomAttribute<DisplayAttribute>()
                            .GetName();
        }
    }
}