/***************************************************************************

Copyright (c) Lowell Stewart 2018-2019.
Licensed under the Mozilla Public License. See LICENSE file in the project root for full license information.

Published at https://github.com/opendocx/opendocx
Developer: Lowell Stewart
Email: lowell@opendocx.com

Portions Copyright (c) Microsoft. All rights reserved.
Portions Copyright (c) Eric White Inc. All rights reserved.

***************************************************************************/

using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Threading.Tasks;
using System.IO;
using System.Text.RegularExpressions;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using OpenXmlPowerTools;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Validation;

namespace OpenDocx
{
    public class Validator
    {
        public ValidateResult ValidateDocument(string documentFile)
        {
            bool hasErrors = false;
            string errorList;
            WmlDocument doc = new WmlDocument(documentFile); // reads the document's bytes into memory
            byte[] byteArray = doc.DocumentByteArray;
            using (MemoryStream ms = new MemoryStream())
            {
                ms.Write(byteArray, 0, byteArray.Length); // copy document file (binary) into memory stream
                using (WordprocessingDocument wDoc = WordprocessingDocument.Open(ms, true))
                {
                    OpenXmlValidator v = new OpenXmlValidator();
                    var valErrors = v.Validate(wDoc).Where(ve => !s_ExpectedErrors.Contains(ve.Description));

                    StringBuilder sb = new StringBuilder();
                    foreach (var item in valErrors.Select(r => r.Description).OrderBy(t => t).Distinct())
	                {
                        hasErrors = true;
		                sb.Append(item).Append(Environment.NewLine);
	                }
                    errorList = sb.ToString();
                }
            }
            return new ValidateResult(hasErrors, errorList);
        }

        #pragma warning disable CS1998
        public async Task<object> ValidateDocumentAsync(dynamic input)
        {
            var documentFile = (string)input.documentFile;
            await Task.Yield();
            return ValidateDocument(documentFile);
        }
        #pragma warning restore CS1998

        private static List<string> s_ExpectedErrors = new List<string>()
        {
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:evenHBand' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:evenVBand' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:firstColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:firstRow' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:firstRowFirstColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:firstRowLastColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:lastColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:lastRow' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:lastRowFirstColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:lastRowLastColumn' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:noHBand' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:noVBand' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:oddHBand' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:oddVBand' attribute is not declared.",
            "The attribute 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:name' has invalid value 'useWord2013TrackBottomHyphenation'. The Enumeration constraint failed.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:allStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:alternateStyleNames' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:clearFormatting' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:customStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:directFormattingOnNumbering' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:directFormattingOnParagraphs' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:directFormattingOnRuns' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:directFormattingOnTables' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:headingStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:latentStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:numberingStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:stylesInUse' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:tableStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:top3HeadingStyles' attribute is not declared.",
            "The 'http://schemas.openxmlformats.org/wordprocessingml/2006/main:visibleStyles' attribute is not declared.",

            "The 'http://schemas.microsoft.com/office/word/2012/wordml:restartNumberingAfterBreak' attribute is not declared.",
        };
    }
}