using DocumentFormat.OpenXml.Packaging;
using HTEXLib.COMM.Helpers;
using HTEXLib.Helpers.ShapeHelpers;
using HTEXLib.Models.Inner;
using OpenXmlPowerTools;
using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace HTEXLib.Translator
{
    public   class DOXC2HTMLTranslator
    {
        public string Translate(Stream fileStream)
        {
          
            byte[] byteArray = new byte[fileStream.Length];
            fileStream.Read(byteArray, 0, byteArray.Length);
            //byte[] bytes = new byte[stream.Length];
            using (MemoryStream memoryStream = new MemoryStream())
            {
                memoryStream.Write(byteArray, 0, byteArray.Length);
                using (WordprocessingDocument doc = WordprocessingDocument.Open(memoryStream, true))
                {
                    int imageCounter = 0;
                    WmlToHtmlConverterSettings settings = new WmlToHtmlConverterSettings()
                    {
                        PageTitle = "",
                        AdditionalCss = "body { margin: 1cm auto; max-width: 20cm; padding: 0; }",

                        FabricateCssClasses = true,
                        CssClassPrefix = "pt-",
                        RestrictToSupportedLanguages = false,
                        RestrictToSupportedNumberingFormats = false,
                        ImageHandler = imageInfo =>
                        {
                            ++imageCounter;
                            string extension = imageInfo.ContentType.Split('/')[1].ToLower();
                            ImageFormat imageFormat = null;
                            if (extension.Equals("png")) imageFormat = ImageFormat.Png;
                            else if (extension.Equals("gif")) imageFormat = ImageFormat.Gif;
                            else if (extension.Equals("bmp")) imageFormat = ImageFormat.Bmp;
                            else if (extension.Equals("jpeg")) imageFormat = ImageFormat.Jpeg;
                            else if (extension.Equals("tiff"))
                            {
                                extension = "gif";
                                imageFormat = ImageFormat.Gif;
                            }
                            else if (extension.Equals("x-wmf"))
                            {
                                extension = "wmf";
                                imageFormat = ImageFormat.Wmf;
                            }
                            else if (extension.Equals("x-emf"))
                            {
                                extension = "emf";
                                imageFormat = ImageFormat.Emf;
                            }

                            if (imageFormat == null) return null;
                            string base64 = null;
                            string mimeType = null;
                           // string shaCode = null;
                            try
                            {
                                if (extension.Equals("wmf"))
                                {
                                    if (!string.IsNullOrWhiteSpace(imageInfo.Mathxml))
                                    {
                                        var buffer = Encoding.Default.GetBytes(imageInfo.Mathxml);
                                        base64 = System.Convert.ToBase64String(buffer);
                                        mimeType = "image/svg+xml";
                                     //   shaCode = ShaHashHelper.GetSHA1(new MemoryStream(buffer));
                                    }
                                    else {
                                        ImageFormat format = imageInfo.Bitmap.RawFormat;
                                        mimeType = "image/png";
                                        imageFormat = ImageFormat.Png;
                                        using (MemoryStream ms = new MemoryStream())
                                        {

                                            imageInfo.Bitmap.Save(ms, imageFormat);
                                            var ba = ms.ToArray();
                                            base64 = System.Convert.ToBase64String(ba);
                                          //  shaCode = ShaHashHelper.GetSHA1(ms);
                                        }
                                    }
                                   
                                }
                               else if (extension.Equals("emf"))
                                {
                                    if (!string.IsNullOrWhiteSpace(imageInfo.Mathxml)) {
                                        base64 = imageInfo.Mathxml;
                                        mimeType = "image/png";
                                    }
                                }
                                else
                                {
                                    ImageFormat format = imageInfo.Bitmap.RawFormat;
                                    ImageCodecInfo codec = ImageCodecInfo.GetImageDecoders()
                                                                .First(c => c.FormatID == format.Guid);
                                    mimeType = codec.MimeType;
                                    using (MemoryStream ms = new MemoryStream())
                                    {

                                        imageInfo.Bitmap.Save(ms, imageFormat);
                                        var ba = ms.ToArray();
                                        base64 = System.Convert.ToBase64String(ba);
                                       // shaCode = ShaHashHelper.GetSHA1(ms);
                                    }
                                }
                            }
                            catch (System.Runtime.InteropServices.ExternalException)
                            { return null; }

                            string imageSource =
                                    string.Format("data:{0};base64,{1}", mimeType, base64);
                            #region 处理图片存到Bolb
                            string[] strs = imageSource.Split(',');
                            string fileExt = StringHelper.SubMidString(strs[0], ":", ";");
                            if (ContentTypeDict.extdict.TryGetValue(fileExt, out string ext))
                            {
                                fileExt = ext;
                            }
                            else
                            {
                                //解决多种扩展名不能获取的
                                string[] sp = StringHelper.SubMidString(strs[0], "/", ";").Split('-');
                                fileExt = sp[sp.Length - 1];
                                sp = fileExt.Split('+');
                                fileExt = "." + sp[sp.Length - 1];
                            }
                            string url = "data:" + mimeType + ";base64," + strs[1];
                            url = url.Replace("\r\n", "");

                            //Stream stream = new MemoryStream(Convert.FromBase64String(strs[1]));
                          //  string filename = shaCode + fileExt;
                            //  AzureBlobModel model = azureBlobDBRepository.UploadFileByFolderNAsyn(stream, FolderName, filename, "exercise", false);
                            #endregion
                            XElement img = new XElement(Xhtml.img,
                                 new XAttribute(NoNamespace.src, url),
                                    //  new XAttribute(NoNamespace.src, model.BlobUrl),
                                    imageInfo.ImgStyleAttribute,
                                    imageInfo.AltText != null ?
                                        new XAttribute(NoNamespace.alt, imageInfo.AltText) : null);
                            //stream.Close();
                            return img;
                        }
                    };
                    // XElement html = HtmlConverter.ConvertToHtml(doc, settings);
                    // File.WriteAllText(@"E:\document\kk.html", html.ToStringNewLineOnAttributes());
                    XElement htmlElement = WmlToHtmlConverter.ConvertToHtml(doc, settings);
                    var htmls = new XDocument(new XDocumentType("html", null, null, null), htmlElement);
                    var htmlString = htmls.ToString(SaveOptions.DisableFormatting);
                    //引入MathJax插件
                    htmlString = htmlString + "<script type=\"text/javascript\" src=\"https://lib.baomitu.com/mathjax/2.7.9/MathJax.js?config=TeX-AMS-MML_HTMLorMML\"></script>";
                    //File.WriteAllText(folder + "/" + "index.html", htmlString);
                    
                    foreach (var kp in Globals.replaceKP) {
                        htmlString = htmlString.Replace(kp.Key, kp.Value);
                    }
                    return htmlString;
                };
            }
        }
    }
}