// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using DocumentFormat.OpenXml.Validation;
using OpenXmlPowerTools;
using System.Text;
using DocumentFormat.OpenXml;
using System.Drawing.Imaging;

namespace OpenXmlPowerTools
{
    public static class AddDocxTextHelper
    {
        public static WmlDocument AppendParagraphToDocument(
            WmlDocument wmlDoc,
            string strParagraph,
            bool isBold,
            bool isItalic,
            bool isUnderline,
            string foreColor,
            string backColor,
            string styleName)
        {
            using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(wmlDoc))
            {
                using (WordprocessingDocument wDoc = streamDoc.GetWordprocessingDocument())
                {
                    StyleDefinitionsPart part = wDoc.MainDocumentPart.StyleDefinitionsPart;

                    Body body = wDoc.MainDocumentPart.Document.Body;

                    SectionProperties sectionProperties = body.Elements<SectionProperties>().FirstOrDefault();

                    Paragraph paragraph = new Paragraph();
                    Run run = paragraph.AppendChild(new Run());
                    RunProperties runProperties = new RunProperties();

                    if (isBold)
                        runProperties.AppendChild(new Bold());

                    if (isItalic)
                        runProperties.AppendChild(new Italic());


                    if (!string.IsNullOrEmpty(foreColor))
                    {
                        int colorValue = ColorParser.FromName(foreColor).ToArgb();
                        if (colorValue == 0)
                            throw new OpenXmlPowerToolsException(String.Format("Add-DocxText: The specified color {0} is unsupported, Please specify the valid color. Ex, Red, Green", foreColor));

                        string ColorHex = string.Format("{0:x6}", colorValue);
                        runProperties.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Color() { Val = ColorHex.Substring(2) });
                    }

                    if (isUnderline)
                        runProperties.AppendChild(new Underline() { Val = UnderlineValues.Single });

                    if (!string.IsNullOrEmpty(backColor))
                    {
                        int colorShade = ColorParser.FromName(backColor).ToArgb();
                        if (colorShade == 0)
                            throw new OpenXmlPowerToolsException(String.Format("Add-DocxText: The specified color {0} is unsupported, Please specify the valid color. Ex, Red, Green", foreColor));

                        string ColorShadeHex = string.Format("{0:x6}", colorShade);
                        runProperties.AppendChild(new Shading() { Fill = ColorShadeHex.Substring(2), Val = ShadingPatternValues.Clear });
                    }

                    if (!string.IsNullOrEmpty(styleName))
                    {
                        Style style = part.Styles.Elements<Style>().Where(s => s.StyleId == styleName).FirstOrDefault();
                        //if the specified style is not present in word document add it
                        if (style == null)
                        {
                            using (MemoryStream memoryStream = new MemoryStream())
                            {
                                #region Default.dotx Template has been used to get all the paragraph styles
                                string base64 =
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                                #endregion

                                char[] base64CharArray = base64.Where(c => c != '\r' && c != '\n').ToArray();
                                byte[] byteArray = System.Convert.FromBase64CharArray(base64CharArray, 0, base64CharArray.Length);
                                memoryStream.Write(byteArray, 0, byteArray.Length);

                                using (WordprocessingDocument defaultDotx = WordprocessingDocument.Open(memoryStream, true))
                                {
                                    //Get the specified style from Default.dotx template for paragraph
                                    Style templateStyle = defaultDotx.MainDocumentPart.StyleDefinitionsPart.Styles.Elements<Style>().Where(s => s.StyleId == styleName && s.Type == StyleValues.Paragraph).FirstOrDefault();

                                    //Check if the style is proper style. Ex, Heading1, Heading2
                                    if (templateStyle == null)
                                        throw new OpenXmlPowerToolsException(String.Format("Add-DocxText: The specified style name {0} is unsupported, Please specify the valid style. Ex, Heading1, Heading2, Title", styleName));
                                    else
                                        part.Styles.Append((templateStyle.CloneNode(true)));
                                }
                            }
                        }

                        paragraph.ParagraphProperties = new ParagraphProperties(new ParagraphStyleId() { Val = styleName });
                    }

                    run.AppendChild(runProperties);
                    run.AppendChild(new Text(strParagraph));

                    if (sectionProperties != null)
                        body.InsertBefore(paragraph, sectionProperties);
                    else
                        body.AppendChild(paragraph);
                }
                return streamDoc.GetModifiedWmlDocument();
            }
        }
    }

    public class HtmlConverterHelper
    {
        public static void ConvertToHtml(string file, string outputDirectory)
        {
            var fi = new FileInfo(file);
            byte[] byteArray = File.ReadAllBytes(fi.FullName);
            using (MemoryStream memoryStream = new MemoryStream())
            {
                memoryStream.Write(byteArray, 0, byteArray.Length);
                using (WordprocessingDocument wDoc = WordprocessingDocument.Open(memoryStream, true))
                {
                    var destFileName = new FileInfo(fi.Name.Replace(".docx", ".html"));
                    if (outputDirectory != null && outputDirectory != string.Empty)
                    {
                        DirectoryInfo di = new DirectoryInfo(outputDirectory);
                        if (!di.Exists)
                        {
                            throw new OpenXmlPowerToolsException("Output directory does not exist");
                        }
                        destFileName = new FileInfo(Path.Combine(di.FullName, destFileName.Name));
                    }
                    var imageDirectoryName = destFileName.FullName.Substring(0, destFileName.FullName.Length - 5) + "_files";
                    int imageCounter = 0;
                    var pageTitle = (string)wDoc.CoreFilePropertiesPart.GetXDocument().Descendants(DC.title).FirstOrDefault();
                    if (pageTitle == null)
                        pageTitle = fi.FullName;

                    WmlToHtmlConverterSettings settings = new WmlToHtmlConverterSettings()
                    {
                        PageTitle = pageTitle,
                        FabricateCssClasses = true,
                        CssClassPrefix = "pt-",
                        RestrictToSupportedLanguages = false,
                        RestrictToSupportedNumberingFormats = false,
                        ImageHandler = imageInfo =>
                        {
                            DirectoryInfo localDirInfo = new DirectoryInfo(imageDirectoryName);
                            if (!localDirInfo.Exists)
                                localDirInfo.Create();
                            ++imageCounter;
                            string extension = imageInfo.ContentType.Split('/')[1].ToLower();
                            ImageFormat imageFormat = null;
                            if (extension == "png")
                            {
                                // Convert png to jpeg.
                                extension = "gif";
                                imageFormat = ImageFormat.Gif;
                            }
                            else if (extension == "gif")
                                imageFormat = ImageFormat.Gif;
                            else if (extension == "bmp")
                                imageFormat = ImageFormat.Bmp;
                            else if (extension == "jpeg")
                                imageFormat = ImageFormat.Jpeg;
                            else if (extension == "tiff")
                            {
                                // Convert tiff to gif.
                                extension = "gif";
                                imageFormat = ImageFormat.Gif;
                            }
                            else if (extension == "x-wmf")
                            {
                                extension = "wmf";
                                imageFormat = ImageFormat.Wmf;
                            }

                            // If the image format isn't one that we expect, ignore it,
                            // and don't return markup for the link.
                            if (imageFormat == null)
                                return null;

                            string imageFileName = imageDirectoryName + "/image" +
                                imageCounter.ToString() + "." + extension;
                            try
                            {
                                imageInfo.Bitmap.Save(imageFileName, imageFormat);
                            }
                            catch (System.Runtime.InteropServices.ExternalException)
                            {
                                return null;
                            }
                            XElement img = new XElement(Xhtml.img,
                                new XAttribute(NoNamespace.src, imageFileName),
                                imageInfo.ImgStyleAttribute,
                                imageInfo.AltText != null ?
                                    new XAttribute(NoNamespace.alt, imageInfo.AltText) : null);
                            return img;
                        }
                    };
                    XElement html = WmlToHtmlConverter.ConvertToHtml(wDoc, settings);

                    // Note: the xhtml returned by ConvertToHtmlTransform contains objects of type
                    // XEntity.  PtOpenXmlUtil.cs define the XEntity class.  See
                    // http://blogs.msdn.com/ericwhite/archive/2010/01/21/writing-entity-references-using-linq-to-xml.aspx
                    // for detailed explanation.
                    //
                    // If you further transform the XML tree returned by ConvertToHtmlTransform, you
                    // must do it correctly, or entities will not be serialized properly.

                    var htmlString = html.ToString(SaveOptions.DisableFormatting);
                    File.WriteAllText(destFileName.FullName, htmlString, Encoding.UTF8);
                }
            }
        }
    }

    public class ValidationHelper
    {
        public static bool IsValid(string fileName, string officeVersion)
        {
#if !NET35
            FileFormatVersions fileFormatVersion = FileFormatVersions.Office2013;
#else
            FileFormatVersions fileFormatVersion = FileFormatVersions.Office2010;
#endif
            try
            {
                fileFormatVersion = (FileFormatVersions)Enum.Parse(fileFormatVersion.GetType(), officeVersion);
            }
            catch (Exception)
            {
#if !NET35
                fileFormatVersion = FileFormatVersions.Office2013;
#else
                fileFormatVersion = FileFormatVersions.Office2010;
#endif
            }

            FileInfo fi = new FileInfo(fileName);
            if (Util.IsWordprocessingML(fi.Extension))
            {
                using (WordprocessingDocument wDoc = WordprocessingDocument.Open(fileName, false))
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(wDoc);
                    bool valid = errors.Count() == 0;
                    return valid;
                }
            }
            else if (Util.IsSpreadsheetML(fi.Extension))
            {
                using (SpreadsheetDocument sDoc = SpreadsheetDocument.Open(fileName, false))
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(sDoc);
                    bool valid = errors.Count() == 0;
                    return valid;
                }
            }
            else if (Util.IsPresentationML(fi.Extension))
            {
                using (PresentationDocument pDoc = PresentationDocument.Open(fileName, false))
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(pDoc);
                    bool valid = errors.Count() == 0;
                    return valid;
                }
            }
            return false;
        }

        public static IEnumerable<ValidationErrorInfo> GetOpenXmlValidationErrors(string fileName,
            string officeVersion)
        {
#if !NET35
            FileFormatVersions fileFormatVersion = FileFormatVersions.Office2013;
#else
            FileFormatVersions fileFormatVersion = FileFormatVersions.Office2010;
#endif
            try
            {
                fileFormatVersion = (FileFormatVersions)Enum.Parse(fileFormatVersion.GetType(), officeVersion);
            }
            catch (Exception)
            {
#if !NET35
                fileFormatVersion = FileFormatVersions.Office2013;
#else
                fileFormatVersion = FileFormatVersions.Office2010;
#endif
            }

            FileInfo fi = new FileInfo(fileName);
            if (Util.IsWordprocessingML(fi.Extension))
            {
                WmlDocument wml = new WmlDocument(fileName);
                using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(wml))
                using (WordprocessingDocument wDoc = streamDoc.GetWordprocessingDocument())
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(wDoc);
                    return errors.ToList();
                }
            }
            else if (Util.IsSpreadsheetML(fi.Extension))
            {
                SmlDocument Sml = new SmlDocument(fileName);
                using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(Sml))
                using (SpreadsheetDocument wDoc = streamDoc.GetSpreadsheetDocument())
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(wDoc);
                    return errors.ToList();
                }
            }
            else if (Util.IsPresentationML(fi.Extension))
            {
                PmlDocument Pml = new PmlDocument(fileName);
                using (OpenXmlMemoryStreamDocument streamDoc = new OpenXmlMemoryStreamDocument(Pml))
                using (PresentationDocument wDoc = streamDoc.GetPresentationDocument())
                {
                    OpenXmlValidator validator = new OpenXmlValidator(fileFormatVersion);
                    var errors = validator.Validate(wDoc);
                    return errors.ToList();
                }
            }
            return Enumerable.Empty<ValidationErrorInfo>();
        }
    }

    public class DocxMetrics
    {
        public string FileName;

	    public int ActiveX;
	    public int AltChunk;
	    public int AsciiCharCount;
	    public int AsciiRunCount;
	    public int AverageParagraphLength;
	    public int ComplexField;
	    public int ContentControlCount;
	    public XmlDocument ContentControls;
	    public int CSCharCount;
	    public int CSRunCount;
	    public bool DocumentProtection;
	    public int EastAsiaCharCount;
	    public int EastAsiaRunCount;
	    public int ElementCount;
	    public bool EmbeddedXlsx;
	    public int HAnsiCharCount;
	    public int HAnsiRunCount;
	    public int Hyperlink;
	    public bool InvalidSaveThroughXslt;
	    public string Languages;
	    public int LegacyFrame;
	    public int MultiFontRun;
	    public string NumberingFormatList;
	    public int ReferenceToNullImage;
	    public bool RevisionTracking;
	    public int RunCount;
	    public int SimpleField;
	    public XmlDocument StyleHierarchy;
	    public int SubDocument;
	    public int Table;
	    public int TextBox;
	    public bool TrackRevisionsEnabled;
	    public bool Valid;
        public int ZeroLengthText;
    }

    public static class GetMetricsHelper
    {
        public static DocxMetrics GetDocxMetrics(string fileName)
        {
            WmlDocument wmlDoc = new WmlDocument(fileName);
            MetricsGetterSettings settings = new MetricsGetterSettings();
            settings.IncludeTextInContentControls = false;
            settings.IncludeXlsxTableCellData = false;
            var metricsXml = MetricsGetter.GetDocxMetrics(wmlDoc, settings);
            DocxMetrics metrics = new DocxMetrics();
            metrics.FileName = wmlDoc.FileName;

            metrics.StyleHierarchy         = GetXmlDocumentForMetrics(metricsXml, H.StyleHierarchy);
            metrics.ContentControls        = GetXmlDocumentForMetrics(metricsXml, H.Parts);
            metrics.TextBox                = GetIntForMetrics(metricsXml, H.TextBox);
            metrics.ContentControlCount    = GetIntForMetrics(metricsXml, H.ContentControl);
            metrics.ComplexField           = GetIntForMetrics(metricsXml, H.ComplexField);
            metrics.SimpleField            = GetIntForMetrics(metricsXml, H.SimpleField);
            metrics.AltChunk               = GetIntForMetrics(metricsXml, H.AltChunk);
            metrics.Table                  = GetIntForMetrics(metricsXml, H.Table);
            metrics.Hyperlink              = GetIntForMetrics(metricsXml, H.Hyperlink);
            metrics.LegacyFrame            = GetIntForMetrics(metricsXml, H.LegacyFrame);
            metrics.ActiveX                = GetIntForMetrics(metricsXml, H.ActiveX);
            metrics.SubDocument            = GetIntForMetrics(metricsXml, H.SubDocument);
            metrics.ReferenceToNullImage   = GetIntForMetrics(metricsXml, H.ReferenceToNullImage);
            metrics.ElementCount           = GetIntForMetrics(metricsXml, H.ElementCount);
            metrics.AverageParagraphLength = GetIntForMetrics(metricsXml, H.AverageParagraphLength);
            metrics.RunCount               = GetIntForMetrics(metricsXml, H.RunCount);
            metrics.ZeroLengthText         = GetIntForMetrics(metricsXml, H.ZeroLengthText);
            metrics.MultiFontRun           = GetIntForMetrics(metricsXml, H.MultiFontRun);
            metrics.AsciiCharCount         = GetIntForMetrics(metricsXml, H.AsciiCharCount);
            metrics.CSCharCount            = GetIntForMetrics(metricsXml, H.CSCharCount);
            metrics.EastAsiaCharCount      = GetIntForMetrics(metricsXml, H.EastAsiaCharCount);
            metrics.HAnsiCharCount         = GetIntForMetrics(metricsXml, H.HAnsiCharCount);
            metrics.AsciiRunCount          = GetIntForMetrics(metricsXml, H.AsciiRunCount);
            metrics.CSRunCount             = GetIntForMetrics(metricsXml, H.CSRunCount);
            metrics.EastAsiaRunCount       = GetIntForMetrics(metricsXml, H.EastAsiaRunCount);
            metrics.HAnsiRunCount          = GetIntForMetrics(metricsXml, H.HAnsiRunCount);
            metrics.RevisionTracking       = GetBoolForMetrics(metricsXml, H.RevisionTracking);
            metrics.EmbeddedXlsx           = GetBoolForMetrics(metricsXml, H.EmbeddedXlsx);
            metrics.InvalidSaveThroughXslt = GetBoolForMetrics(metricsXml, H.InvalidSaveThroughXslt);
            metrics.TrackRevisionsEnabled  = GetBoolForMetrics(metricsXml, H.TrackRevisionsEnabled);
            metrics.DocumentProtection     = GetBoolForMetrics(metricsXml, H.DocumentProtection);
            metrics.Valid                  = GetBoolForMetrics(metricsXml, H.Valid);
            metrics.Languages              = GetStringForMetrics(metricsXml, H.Languages);
            metrics.NumberingFormatList    = GetStringForMetrics(metricsXml, H.NumberingFormatList);

            return metrics;
        }

        private static string GetStringForMetrics(XElement metricsXml, XName xName)
        {
            var ele = metricsXml.Element(xName);
            if (ele == null)
                return "";
            return (string)ele.Attribute(H.Val);
        }

        private static bool GetBoolForMetrics(XElement metricsXml, XName xName)
        {
            var ele = metricsXml.Element(xName);
            if (ele == null)
                return false;
            return (bool)ele.Attribute(H.Val);
        }

        private static int GetIntForMetrics(XElement metricsXml, XName xName)
        {
            var ele = metricsXml.Element(xName);
            if (ele == null)
                return 0;
            return (int)ele.Attribute(H.Val);
        }

        private static XmlDocument GetXmlDocumentForMetrics(XElement metricsXml, XName xName)
        {
            var ele = metricsXml.Element(xName);
            if (ele == null)
                return null;
            return (new XDocument(metricsXml.Element(xName))).GetXmlDocument();
        }
    }
}