using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;
using System.Threading;

using OpenSEMI.Core.Msg;

namespace OpenSEMI.ClientBase.UI
{
    public class UIHandler : IHandler
    {
        public UIHandler()
        {
            this.acts = new Dictionary<string, Action>();
            this.Looper = new MsgPool(500, Do);
        }

        public void Handle()
        {
            this.Looper.Run();
        }

        private void Do(MsgPool looper)
        {
            lock(lockObj)
            {
                if (Application.Current == null || Application.Current.Dispatcher == null)
                    return;

                Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (ThreadStart)delegate
                {
                    foreach (KeyValuePair<string, Action> kv in this.acts)
                    {
                        kv.Value();
                    }
                });
            }
        }

        public void Register(string key, Action act)
        {
            lock(lockObj)
            {
                if (!this.acts.ContainsKey(key))
                {
                    this.acts.Add(key, act);
                }
            }
        }

        public void UnRegister(string key)
        {
            lock(lockObj)
            {
                if (this.acts.ContainsKey(key))
                    this.acts.Remove(key);
            }
        }

        public MsgPool Looper { get; private set; }

        private Dictionary<string, Action> acts;
        private static object lockObj = new object();
    }
}