using System;
using UnityEngine;
using UnityEngine.Events;

namespace UltimateWater
{
	[AddComponentMenu("Ultimate Water/Water Sampler")]
	public class WaterSampler : MonoBehaviour
	{
		[Serializable]
		public class WaterSubmersionEvent : UnityEvent<SubmersionState>
		{
		}

		public enum SubmersionState
		{
			Under = 0,
			Above = 1
		}

		[Header("References")]
		[SerializeField]
		private Water _Water;

		public float Hysteresis = 0.1f;

		[Header("Events")]
		public WaterSubmersionEvent OnSubmersionStateChanged;

		private WaterSample _Sample;

		private float _PreviousWaterHeight;

		private float _PreviousObjectHeight;

		public float Height { get; private set; }

		public float Velocity { get; private set; }

		public SubmersionState State { get; private set; }

		public bool IsInitialized
		{
			get
			{
				if (_Water != null)
				{
					return _Sample != null;
				}
				return false;
			}
		}

		private void Start()
		{
			if (_Water == null)
			{
				_Water = Utilities.GetWaterReference();
			}
			_Sample = new WaterSample(_Water);
		}

		private void Update()
		{
			Vector3 andReset = _Sample.GetAndReset(base.transform.position);
			float num = (base.transform.position.y - _PreviousObjectHeight) / Time.deltaTime;
			float num2 = (andReset.y - _PreviousWaterHeight) / Time.deltaTime;
			Velocity = Mathf.Abs(num - num2);
			Height = base.transform.position.y - andReset.y;
			if (State != GetState(Height) && Mathf.Abs(Height) > Hysteresis)
			{
				State = ((Height > 0f) ? SubmersionState.Above : SubmersionState.Under);
				OnSubmersionStateChanged.Invoke(State);
			}
			_PreviousObjectHeight = base.transform.position.y;
			_PreviousWaterHeight = andReset.y;
			base.transform.rotation = Quaternion.identity;
		}

		private void OnDrawGizmos()
		{
			Gizmos.color = Color.yellow;
			Gizmos.DrawWireSphere(base.transform.position, 0.2f);
		}

		private void Reset()
		{
			_Water = Utilities.GetWaterReference();
		}

		private static SubmersionState GetState(float height)
		{
			if (!(height > 0f))
			{
				return SubmersionState.Under;
			}
			return SubmersionState.Above;
		}
	}
}