using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace POSV
{
    public sealed class WaitWindow
    {
        private WaitWindowGUI _GUI;
        internal delegate void MethodInvoker<T>(T parameter1);
        internal EventHandler<WaitWindowEventArgs> _WorkerMethod;
        internal List<object> _Args;

        private WaitWindow() {
        
        }


        public static object Show(EventHandler<WaitWindowEventArgs> workerMethod)
        {
            return WaitWindow.Show(workerMethod, null);
        }

        public static object Show(EventHandler<WaitWindowEventArgs> workerMethod, string message)
        {
            WaitWindow instance = new WaitWindow();
            return instance.Show(workerMethod, message, new List<object>());
        }

        public static object Show(EventHandler<WaitWindowEventArgs> workerMethod, string message, params object[] args)
        {
            List<object> arguments = new List<object>();
            arguments.AddRange(args);

            WaitWindow instance = new WaitWindow();
            return instance.Show(workerMethod, message, arguments);
        }

        public string Message
        {
            set
            {
                this._GUI.Invoke(new MethodInvoker<string>(this._GUI.SetMessage), value);
            }
        }

        public void Cancel()
        {
            this._GUI.Invoke(new MethodInvoker(this._GUI.Cancel), null);
        }

        private object Show(EventHandler<WaitWindowEventArgs> workerMethod, string message, List<object> args)
        {
            if (workerMethod == null)
            {
                throw new ArgumentException("No worker method has been specified.", "workerMethod");
            }
            else
            {
                this._WorkerMethod = workerMethod;
            }

            this._Args = args;

            if (string.IsNullOrEmpty(message))
            {
                message = "ΗλΙΤΊς...";
            }

            this._GUI = new WaitWindowGUI(this);
            this._GUI.MessageLabel.Text = message;
            //this._GUI.circularProgress.Start();
            this._GUI.ShowDialog();

            object result = this._GUI._Result;

            Exception _Error = this._GUI._Error;
            this._GUI.Dispose();

            if (_Error != null)
            {
                throw _Error;
            }
            else
            {
                return result;
            }
        }
    }

    public class WaitWindowEventArgs : EventArgs
    {
        public WaitWindowEventArgs(WaitWindow GUI, List<object> args)
            : base()
        {
            this._Window = GUI;
            this._Arguments = args;
        }

        private WaitWindow _Window;
        private List<object> _Arguments;
        private object _Result;

        public WaitWindow Window
        {
            get { return _Window; }
        }

        public List<object> Arguments
        {
            get { return _Arguments; }
        }

        public object Result
        {
            get { return _Result; }
            set { _Result = value; }
        }
    }
}