using System;
using System.Collections;
using System.Collections.Specialized;
using System.Text.RegularExpressions;
using System.Diagnostics;
	
namespace IvyBus
{
	/// <summary>
	/// Description résumée de IvyBinding.
	/// </summary>
	internal abstract class IvyBindingBase
	{

        internal ushort key;
		internal string expression;

        public IvyBindingBase(ushort id, string exp)
		{
			key = id;
			expression = exp;
		}
        public abstract string[] Match(string message);
		
	}
	internal class IvyBindingRegexp :  IvyBindingBase
	{
		internal Regex regexp;

        public IvyBindingRegexp(ushort id, string exp)
            : base(id, exp)
		{
			regexp = new Regex(expression,RegexOptions.Compiled|RegexOptions.IgnoreCase);		
		}
        public override string[] Match(string message)
		{
        string[] args = null;
		// use of regexp to extract info
		Match result = regexp.Match(message);
		if (result.Success)
			{
				// Start at 1 because group 0 represent entire matching
                args = new string[result.Groups.Count-1];
				for (int sub = 1; sub < result.Groups.Count; sub++)
				{
                    args[sub-1] = result.Groups[sub].Value;
				}
			}
		return args;	
		}
	}
	internal class IvyBindingSimple :  IvyBindingBase
	{
		internal string msgname; // message name  
		internal string[] msgargs; // list of message args names
		static string msgtag;			// send message name  
		static StringDictionary args_values;	// send message args[name]=value

        public IvyBindingSimple(ushort id, string exp)
            : base(id, exp)
		{
			string[] expr = expression.Split( ' ' );
			msgname = expr[0];
			msgargs = new string[ expr.Length -1 ];
			for ( int i = 1; i < expr.Length; i++ )
				msgargs[i-1] = expr[i];
		}
		static public void Prepare( string message )
		{	
			string[] msg = message.Split(' ');
			msgtag = msg[0];
			args_values = new StringDictionary();
			for( int sub=1 ; sub < msg.Length; sub++ )
			{
				string[] arg = msg[sub].Split('='); // champ = valeur
				if ( arg.Length == 2 )
					args_values[arg[0]] = arg[1]; 
				else 
				{
                    traceDebug("abnormally Formed message expected 'msg champ=valeur champ=valeur....' :" + message);
				}
			}
			
		}
        public override string[] Match(string message)
		{
			// the message is already parsed by prepare 
			// 
            string[] args = null;
			
			if (msgtag == msgname)
			{
                args = new string[msgargs.Length];
				for( int sub= 0; sub < msgargs.Length; sub++)
				{
                    args[sub] = args_values[msgargs[sub]];
				}
			}
			return args;
		}
        [Conditional("DEBUG")]
        private static void traceDebug(string s)
        {
            Trace.Assert(false,"-->IvyBindingSimple<-- " + s);
        }
	}
}