using System;
using System.Xml;
using System.Text;

namespace VlnXml
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
 
	public class VlnXmlDocument:XmlDocument 
	{
		public VlnXmlDocument():base() 
		{
		}

		public override XmlElement CreateElement( string prefix, string localname, string nsURI) 
		{
			VlnXmlElement elem = new VlnXmlElement(prefix, localname, nsURI, this);
			return elem;
		}

	}

	public class VlnXmlElement:XmlElement 
	{

		public VlnXmlElement( string prefix, string localname, string nsURI, XmlDocument doc ):base( prefix,localname,nsURI, doc )
		{
		}

		public string GetMenuString(string grpmenuitm, bool isgrp)
		{
			VlnXmlElement elm = this;
			StringBuilder strbld = new StringBuilder();

			bool usespecial; // flags need for (Table) or (Graph)
			string strspecial="";

			// use grpmenuitm, parse for field(s) and generate a string to return
			int left = grpmenuitm.IndexOf("<");
			int right;
			int stindx = 0;
			if (left > 0) strbld.Append(grpmenuitm.Substring(0,left));
	
			while (left != -1)
			{
				// get right bracket and then check for valid field & if commas with
				// this, check for integer values.
				right = grpmenuitm.IndexOf(">",stindx);
				string substring = grpmenuitm.Substring(left+1,right-left-1);
				// do comma parts now.
				string inusename;
				substring = substring.Replace(" ","_");
				int comma1 = substring.IndexOf(",");
				int frmt1=0, frmt2=0;
				if (comma1 != -1)
				{
					// get any numbers for formatting & check for ints.
					int comma2 = substring.IndexOf(",",comma1+1);
					if (comma2 != -1) // two ints.
					{
						if (comma2-comma1 > 1) // first format field - not empty 
						{
							string int1 = substring.Substring(comma1+1,comma2-comma1-1);
							frmt1 = System.Convert.ToInt32(int1);
						}
						if (comma2<substring.Length)  // second part - not empty
						{
							string int2 = substring.Substring(comma2+1,substring.Length-comma2-1);
							frmt2 = System.Convert.ToInt32(int2);
						}
					}
					else  // just one format 
					{
						string int1 = substring.Substring(comma1,comma2-comma1);
						frmt1 = System.Convert.ToInt32(int1);
					}
					inusename = substring.Substring(0,comma1);
				}
				else  // no commas, it's just a field name.
					inusename = substring;

				// get contents of field & append it onto the string builder.
				usespecial = false;
				XmlNode elmnode = (XmlNode) elm;
				XmlNode nd = elmnode.SelectSingleNode(inusename);
				// if not found it may be a combination, try this.
				if (nd == null)
				{
					string tmp = inusename + "a";
					nd = elmnode.SelectSingleNode(tmp);
				}
				if (nd == null)
				{
					string tmp = inusename + "b";
					nd = elmnode.SelectSingleNode(tmp);
				}
				if (nd == null)
				{
					string tmp = inusename + "c";
					nd = elmnode.SelectSingleNode(tmp);
					if (nd!=null)
					{
						usespecial = true;
						strspecial = "(Table)";
					}
				}
				if (nd == null)
				{
					string tmp = inusename + "d";
					nd = elmnode.SelectSingleNode(tmp);
					if (nd!=null)
					{
						usespecial = true;
						strspecial = "(Graph)";
					}
				}
				if(nd != null) 
				{
					string text;
					if (usespecial)
						text = strspecial;
					else
						text = nd.InnerText;
					
					if (isgrp)
					{
						if (frmt2 != 0)
							strbld.Append(text.Replace("_"," ").PadRight(frmt2,' '));
						else
							strbld.Append(text.Replace("_"," "));
					}
					else
					{
						if (frmt1 == 0)
						{
							if (frmt2>0)
								strbld.Append(text.PadRight(frmt2,' '));
							else
								strbld.Append(text);
						}
						else if (frmt1 != frmt2)
						{
							char[] tmp = text.ToCharArray();
							int cnt = 0;
							while (tmp[cnt] <= '9' && tmp[cnt] >= '0') cnt++;
							int padcnt = (cnt>frmt1)?0:frmt1-cnt;
							StringBuilder strtmp = new StringBuilder();
							cnt = 0;
							while(cnt<padcnt) 
							{
								strtmp.Append(" ");
								cnt++;
							}
							strtmp.Append(text);
							string tmpstr = strtmp.ToString();
							strbld.Append(tmpstr.PadRight(frmt2,' '));
						}
						else
							strbld.Append(text.PadLeft(frmt2,' '));
					}
				}
				stindx = right+1;
				left = grpmenuitm.IndexOf("<",left+1);
				if (left != -1 && left > right+1)  // append any plain text.
					strbld.Append(grpmenuitm.Substring(right+1,left-right-1));
			}
			return strbld.ToString();
		}

		public string GetMenuValueTemplate(string menuitm)
		{
			VlnXmlElement parent;
			string grpmenuitm;
			VlnXmlElement tmp;
			if (menuitm == "GroupMenuItem")
			{		
				// if at top of tree, use this top GroupMenuItem. but if not,
				// the parent node defines the GroupMenuItem for the subgroups.
				if (this.ParentNode.Name == "RO_Root")
				{
					tmp = (VlnXmlElement) this.ParentNode;
					grpmenuitm=tmp.GetAttribute(menuitm);
					return(grpmenuitm);
				}
				else
					parent = (VlnXmlElement) this.ParentNode;
				while (parent != null) 
				{
					if (parent.HasAttribute(menuitm) == true) break;
					parent = (VlnXmlElement) parent.ParentNode;
				}
				if (parent == null) return null;
				grpmenuitm = parent.GetAttribute(menuitm);
				return grpmenuitm;
			}

			// Now just do 'MenuItem', which is for ROs
			parent = (VlnXmlElement) this;
			grpmenuitm = parent.GetAttribute(menuitm);
			while (parent != null && grpmenuitm == "")
			{
				// walk up tree to get parent.
				grpmenuitm = parent.GetAttribute(menuitm);
				parent = (VlnXmlElement) parent.ParentNode;
			}
			return grpmenuitm;
		}
	}
}