using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Events;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FWindSoft.Revit
{
    /// <summary>
    /// 业务轮询命令
    /// </summary>
    public class IdlingEventCommand: IRevitRegister
    {
        #region 初始化
        public IdlingEventCommand()
        {
            Commands = new IdlingCommands();
        }
        /// <summary>
        /// 命令队列
        /// </summary>
        private readonly IdlingCommands Commands;
        #endregion

        #region 消费队列
        /// <summary>
        /// 对接事件绑定
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void ApplicaionIdling(object sender, IdlingEventArgs e)
        {
            IdlingCommand currentCommand = Commands.Dequeue();
            if (currentCommand != null)
            {
                currentCommand.Raise(sender as UIApplication);
                e.SetRaiseWithoutDelay();
            }
        }
        #endregion

        #region 生产队列
        public IdlingCommand OnceExecute(Func<RevitEventArgs, HandlerResult> handler, Action<RevitEventArgs> callBack)
        {
            IdlingCommand command = new IdlingCommand(RevitHandlerFactory.CreateOnceHandler(handler, callBack));
            Commands.Enqueue(command);
            return command;
        }

        public IdlingCommand WhileExecute(Func<RevitEventArgs, HandlerResult> handler, Action<RevitEventArgs> callBack)
        {
            IdlingCommand command = new IdlingCommand(RevitHandlerFactory.CreateWhileHandler(handler, callBack));
            Commands.Enqueue(command);
            return command;
        }

        public IdlingCommand Execute(IdlingCommand command)
        {
            if (command == null)
                return null;
            Commands.Enqueue(command);
            return command;
        }
        #endregion

        #region 事件注册相关
        public void Register(ExternalApplication application)
        {
            application.Idling += ApplicaionIdling;
        }

        public void Unregister(ExternalApplication application)
        {
            application.Idling -= ApplicaionIdling;
        } 
        #endregion
    }
}