using System;
using System.Collections;
using UnityEngine;
using UnityEngine.Networking;

namespace SUISS.Scheduling
{
	public class CoYield : IYieldStatement
	{
		protected CoYield()
		{
			this._type = CoYield.YieldType.NullYield;
		}

		protected CoYield(CoYield.YieldType type, object yieldable)
		{
			this._type = type;
			this._yieldable = yieldable;
		}

		public static IYieldStatement On(UnityWebRequest webRequest)
		{
			return new CoYield(CoYield.YieldType.WWW, webRequest);
		}

		public static IYieldStatement On(double suissYield)
		{
			return new CoYield(CoYield.YieldType.SUISSYield, suissYield);
		}

		public static IYieldStatement On(float waitSeconds)
		{
			return new CoYield(CoYield.YieldType.UnityYield, new WaitForSeconds(waitSeconds));
		}

		public static IYieldStatement On(YieldInstruction unityYield)
		{
			return new CoYield(CoYield.YieldType.UnityYield, unityYield);
		}

		public static IYieldStatement On(IEnumerator busyEnumerator)
		{
			return new CoYield(CoYield.YieldType.Enumerator, busyEnumerator);
		}

		public static IYieldStatement NextFrame()
		{
			return new CoYield();
		}

		public object UnityYieldable(MonoBehaviour runner)
		{
			switch (this._type)
			{
			case CoYield.YieldType.Enumerator:
			{
				if (runner == null)
				{
					UnityEngine.Debug.LogError("Error! Cannot use busy IEnumerator a unity yield statement!");
					throw new Exception("Error! Cannot use busy IEnumerator a unity yield statement!");
				}
				IEnumerator enumerator = this._yieldable as IEnumerator;
				if (enumerator == null)
				{
					UnityEngine.Debug.LogError("Busy IEnumerator was null. This is unexpected!");
					throw new Exception("Busy IEnumerator was null. This is unexpected!");
				}
				return runner.StartCoroutine(enumerator);
			}
			case CoYield.YieldType.WWW:
			case CoYield.YieldType.UnityYield:
				if (this._yieldable == null)
				{
					UnityEngine.Debug.LogError("A unity yield object was null. This is unexpected!");
					throw new Exception("A unity yield object was null. This is unexpected!");
				}
				return this._yieldable;
			case CoYield.YieldType.SUISSYield:
				UnityEngine.Debug.LogWarning("A SUISS yield instruction is being passed to the Unity Scheduler. You probably don't want this!");
				return null;
			default:
				return null;
			}
		}

		public object UnityYieldable()
		{
			return this.UnityYieldable(null);
		}

		public object SUISSYieldable()
		{
			switch (this._type)
			{
			case CoYield.YieldType.Enumerator:
				if (!(this._yieldable is IEnumerator))
				{
					UnityEngine.Debug.LogError("Busy IEnumerator was null. This is unexpected!");
					throw new Exception("Busy IEnumerator was null. This is unexpected!");
				}
				return this._yieldable;
			case CoYield.YieldType.WWW:
			case CoYield.YieldType.UnityYield:
			case CoYield.YieldType.SUISSYield:
				if (this._yieldable == null)
				{
					UnityEngine.Debug.LogError("A yield object was null. This is unexpected!");
					throw new Exception("A yield object was null. This is unexpected!");
				}
				return this._yieldable;
			default:
				return null;
			}
		}

		private object _yieldable;

		private CoYield.YieldType _type;

		protected enum YieldType
		{
			Enumerator,
			WWW,
			UnityYield,
			SUISSYield,
			NullYield
		}
	}
}