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

namespace FWindSoft.Revit
{
    /// <summary>
    /// revit接收者创建类
    /// </summary>
    public class RevitHandlerFactory
    {
        /*
         * 回调有两种整合方法；
         * 第一种是在Idling事件里进行拼装
         * 第二种是开一个守护线程，等待事件结束标志，然后再执行；
         *
         * 如果是第一种的话，可以在handler控制，不需要单独去处理这种情况
         * 所以采用第二种
         *
         */
        public static RevitHandler CreateWhileHandler(Func<RevitEventArgs, HandlerResult> handler, Action<RevitEventArgs> callBack)
        {
            RevitHandler revitHandler = new RevitHandler();

            revitHandler.Executing += (sender, args) =>
            {
                TaskCompletionSource<object> tcs = null;
                if (callBack != null)
                {
                    tcs = new TaskCompletionSource<object>();
                    tcs.Task.ContinueWith((t) => callBack(args));
                }
                try
                {
                    do
                    {
                        args.Result = handler(args);
                    } while (args.Result == HandlerResult.Successed);
                }
                finally
                {
                    tcs?.SetResult(null);
                }
            };
            return revitHandler;
        }
        public static RevitHandler CreateWhileHandler(Func<RevitEventArgs, HandlerResult> handler)
        {
           return CreateWhileHandler(handler, null);
        }
        public static RevitHandler CreateOnceHandler(Func<RevitEventArgs, HandlerResult> handler, Action<RevitEventArgs> callBack)
        {
            RevitHandler revitHandler = new RevitHandler();
            revitHandler.Executing += (sender, args) =>
            {
                TaskCompletionSource<object> tcs = null;
                if (callBack != null)
                {
                    tcs = new TaskCompletionSource<object>();
                    tcs.Task.ContinueWith((t) => callBack(args));
                }

                try
                {
                    //将基类属性填写到子类中
                    args.Result = handler(args);
                }
                finally
                {
                    tcs?.SetResult(null);
                }
            };
            return revitHandler;
        }
        public static RevitHandler CreateOnceHandler(Func<RevitEventArgs, HandlerResult> handler)
        {
            return CreateOnceHandler(handler, null);
        }
    }
}