namespace IvyBus
{
    using System;
    using System.Collections.Generic;
    using System.Collections.Specialized;
    using System.Text;
    using System.Threading;
    using System.Text.RegularExpressions;
    using System.Collections.ObjectModel;

    /* This is the Application side of binding storage */
    /* association of a generated Key and a delegate and the expression */
    /* this is SEND to other client */

    public class IvyApplicationBinding 
    {
        private BindingType binding;

        // Argument formatting Expression to replace argument in in regular expresion binding
        // format %number[:objectFormat]%
        //    where number in argument index and objectFormat the ToString format passed to argument
        private Regex re = new Regex(@"%(\d+)(|:(.*))%");

        public BindingType Binding
        {
            get { return binding; }
            set { binding = value; }
        }
        private int key;

 
        public int Key
        {
            get { return key; }
            set { key = value; }
        }

        private object[] args;

        private string expression;

        public string Expression
        {
            get { return expression; }
            set { expression = value; }
        }
        private string formatted_expression;
        public string FormattedExpression
        {
            get
            { 
                FormatExpression();
                return formatted_expression; 
            }
        }

        private Collection<string> arguments;
        ///<summary>SentMessageClasses the first word token of sent messages
        ///<remarks> optimise the parsing process when sending messages </remarks>
        ///</summary>

        public Collection<string> Arguments
        {
            get
            {
                return arguments;
            }
        }

        public event EventHandler<IvyMessageEventArgs> Callback;

        public IvyApplicationBinding()
            :this(BindingType.RegularExpression,string.Empty,null)
        {
          
        }
        internal IvyApplicationBinding(BindingType type, string expression,  params object[] args)
        {
            arguments = new Collection<string>();
            this.Binding = type;
            this.Expression = expression;
            this.args = args;
        }
        
        private string ReplaceArgs(Match m)
        {
            string s = string.Empty;
            // Get the matched string. convert to argindex
            int argindex = int.Parse(m.Groups[1].Value);
            //  use %... to specify formating
            object arg = args[argindex];
            IFormattable fmt = arg as IFormattable;
            if (fmt != null)
                s = fmt.ToString(m.Groups[3].Value, null);
            else if (arg != null)
                s = arg.ToString();

            return s;
        }
        // translate part of expression to object property
        public void FormatExpression()
        {
            //// Safely :
#if (!PocketPC)//TODO Pocket PC doesn't have Target Member
            EventHandler<IvyMessageEventArgs> temp = Callback;
            if (temp != null)
            {
                //TODO Pocket PC doesn't have Target Member
                object target = temp.Target;
               if (args == null)
                {
                    args = new object[arguments.Count];
                    for (int i = 0; i < arguments.Count; i++)
                    {
                        System.Reflection.PropertyInfo prop = target.GetType().GetProperty(arguments[i]);
                        if (prop != null)
                            args[i] = prop.GetValue(target, null);
                        else //TODO what else BUG msgbox in desing mode !!!
                            args[i] = arguments[i];
                    }
                }

               formatted_expression = re.Replace(expression, ReplaceArgs);
            }
            else //TODO Abnormal condition  Design Time 
#endif
            formatted_expression = expression;
            
        }

#if ( PocketPC )
        internal void Firevent(System.Windows.Forms.Control control, IvyMessageEventArgs e)
        {
            //// Safely invoke an event:
            EventHandler<IvyMessageEventArgs> temp = Callback;

            if (temp == null)
            {
                throw new IvyException("(callCallback) Not callback for id " + e.Id);
            }
            if (control != null)
            {
                control.Invoke(temp, this, e);
            }
            else
                temp(this, e);
        }
#else
        internal void Firevent(System.Threading.SynchronizationContext syncContext, bool synchronous , IvyMessageEventArgs e)
        {
            //// Safely invoke an event:
            EventHandler<IvyMessageEventArgs> temp = Callback;

            if (temp == null)
            {
                throw new IvyException("(callCallback) Not callback for id " + e.Id);
            }
            if (synchronous )
            {
                SendOrPostCallback update = delegate(object state)
                              {
                                  IvyMessageEventArgs args = (IvyMessageEventArgs)state;
                                  temp(this, args);
                              };
                syncContext.Post(update, e);
            }
            else
                temp(this, e);
        }

#endif
    }
  
}