using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Xml;

namespace DevelopAssistant.Format
{
 public class XMLFormatHelper
 {
 /// <summary>
 /// Returns a pretty print version of the given xml.
 /// </summary>
 /// <param name="xml">Xml string to pretty print.</param>
 /// <returns>A pretty print version of the specified xml. If the
 /// string is not well formed xml the original string is returned.
 /// </returns>
 static string IndentedFormat(string xml)
 {
 string indentedText = String.Empty;

 try
 {
 XmlTextReader reader = new XmlTextReader(new StringReader(xml));
 reader.WhitespaceHandling = WhitespaceHandling.None;

 StringWriter indentedXmlWriter = new StringWriter();
 XmlTextWriter writer = CreateXmlTextWriter(indentedXmlWriter, false, 4);
 writer.WriteNode(reader, false);
 writer.Flush();

 indentedText = indentedXmlWriter.ToString();
 }
 catch (Exception)
 {
 indentedText = xml;
 }

 return indentedText;
 }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="textWriter"></param>
 /// <param name="convertTabsToSpaces"></param>
 /// <param name="indentationSize"></param>
 /// <returns></returns>
 static XmlTextWriter CreateXmlTextWriter(System.IO.TextWriter textWriter, bool convertTabsToSpaces, int indentationSize)
 {
 XmlTextWriter writer = new XmlTextWriter(textWriter);
 if (convertTabsToSpaces)
 {
 writer.Indentation = indentationSize;
 writer.IndentChar = ' ';
 }
 else
 {
 writer.Indentation = 1;
 writer.IndentChar = '\t';
 }
 writer.Formatting = System.Xml.Formatting.Indented;
 return writer;
 }

 /// <summary>
 /// Returns a formatted xml string using a simple formatting algorithm.
 /// </summary>
 static string SimpleFormat(string xml)
 {
 return xml.Replace("><", ">\r\n<");
 }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="strxml"></param>
 /// <returns></returns>
 public static string FormatToString(string strxml)
 {
 try
 {
 strxml = IndentedFormat(SimpleFormat(IndentedFormat(strxml)));
 }
 catch (Exception ex)
 {
 //
 }
 return strxml;
 }

 /// <summary>
 /// 
 /// </summary>
 /// <param name="strxml"></param>
 /// <returns></returns>
 public static string CompressToString(string strxml)
 {
 string result = string.Empty;

 Regex regex = new Regex(@"//.*\n");
 Match match = regex.Match(strxml);
 while (match.Success)
 {
 string matchstr = match.Groups[0].Value;
 strxml = strxml.Replace(matchstr, matchstr.Replace("//", "/*").Replace("\r\n", "*/\r\n"));
 match = match.NextMatch();
 }

 strxml = strxml.Replace('\r', ' ');
 strxml = strxml.Replace('\n', ' ');
 strxml = strxml.Replace('\t', ' ');

 strxml = Regex.Replace(strxml, " {1,}", " ", RegexOptions.IgnoreCase)
 .Replace("('\n", "('").Replace("\n')", "')")
 .Replace("(\"\n", "(\"").Replace("\n\")", "\")")
 .Replace("\"\n", "\"").Replace("\n\"", "\"");

 strxml = strxml.Replace('\n', ' ');
 //string[] lines_array = strjs.Split('\n'); 

 result = strxml;

 return result;
 }
 }
}