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

namespace TransportGame.Utils
{
    public static class Task
    {
        private class TaskInfo
        {
            public Action Action { get; set; }
            public bool? Success { get; set; }
            public Exception ThrownException { get; set; }
        }

        private static void RunAsync_ActionThread(object info)
        {
            TaskInfo taskInfo = (TaskInfo)info;

            try
            {
                taskInfo.Action();
                taskInfo.Success = true;
            }
            catch (Exception ex)
            {
                taskInfo.ThrownException = ex;
                taskInfo.Success = false;
            }
        }

        public static IEnumerable RunAsync(Action action)
        {
            // Set up task info object
            TaskInfo taskInfo = new TaskInfo();
            taskInfo.Action = action;

            // Start thread and wait
            var thread = new Thread(RunAsync_ActionThread);
            thread.Start(taskInfo);

            // Wait for thread to finish
            while (thread.ThreadState == ThreadState.Running)
                yield return null;

            thread.Join();

            // Rethrow exception
            if (taskInfo.Success.HasValue && !taskInfo.Success.Value)
                throw new Exception("Task failed", taskInfo.ThrownException);
        }
    }
}