using System.Collections.Generic;
using UltimateWater.Internal;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.Serialization;

namespace UltimateWater
{
	public sealed class WaterVolumeProbe : MonoBehaviour
	{
		[SerializeField]
		[FormerlySerializedAs("enter")]
		private UnityEvent _Enter;

		[SerializeField]
		[FormerlySerializedAs("leave")]
		private UnityEvent _Leave;

		private Water _CurrentWater;

		private Transform _Target;

		private bool _Targetted;

		private WaterVolumeSubtract[] _Exclusions;

		private float _Size;

		public Water CurrentWater
		{
			get
			{
				return _CurrentWater;
			}
		}

		public UnityEvent Enter
		{
			get
			{
				return (_Enter == null) ? (_Enter = new UnityEvent()) : _Enter;
			}
		}

		public UnityEvent Leave
		{
			get
			{
				return (_Leave == null) ? (_Leave = new UnityEvent()) : _Leave;
			}
		}

		public static WaterVolumeProbe CreateProbe(Transform target, float size = 0f)
		{
			GameObject gameObject = new GameObject("Water Volume Probe");
			gameObject.hideFlags = HideFlags.HideAndDontSave;
			GameObject gameObject2 = gameObject;
			gameObject2.transform.position = target.position;
			gameObject2.layer = WaterProjectSettings.Instance.WaterCollidersLayer;
			SphereCollider sphereCollider = gameObject2.AddComponent<SphereCollider>();
			sphereCollider.radius = size;
			sphereCollider.isTrigger = true;
			Rigidbody rigidbody = gameObject2.AddComponent<Rigidbody>();
			rigidbody.isKinematic = true;
			rigidbody.mass = 1E-07f;
			WaterVolumeProbe waterVolumeProbe = gameObject2.AddComponent<WaterVolumeProbe>();
			waterVolumeProbe._Target = target;
			waterVolumeProbe._Targetted = true;
			waterVolumeProbe._Size = size;
			waterVolumeProbe._Exclusions = target.GetComponentsInChildren<WaterVolumeSubtract>(true);
			return waterVolumeProbe;
		}

		private void Start()
		{
			ScanWaters();
		}

		private void FixedUpdate()
		{
			if (_Targetted)
			{
				if (_Target == null)
				{
					Object.Destroy(base.gameObject);
					return;
				}
				base.transform.position = _Target.position;
			}
			if (_CurrentWater != null && _CurrentWater.Volume.Boundless)
			{
				if (!_CurrentWater.Volume.IsPointInsideMainVolume(base.transform.position) && !_CurrentWater.Volume.IsPointInside(base.transform.position, _Exclusions, _Size))
				{
					LeaveCurrentWater();
				}
			}
			else if (_CurrentWater == null)
			{
				ScanBoundlessWaters();
			}
		}

		private void OnDestroy()
		{
			_CurrentWater = null;
			if (_Enter != null)
			{
				_Enter.RemoveAllListeners();
				_Enter = null;
			}
			if (_Leave != null)
			{
				_Leave.RemoveAllListeners();
				_Leave = null;
			}
		}

		public void OnTriggerEnter(Collider other)
		{
			if (_CurrentWater != null)
			{
				WaterVolumeBase waterVolume = WaterVolumeBase.GetWaterVolume<WaterVolumeSubtract>(other);
				if (waterVolume != null && waterVolume.EnablePhysics)
				{
					LeaveCurrentWater();
				}
			}
			else
			{
				WaterVolumeBase waterVolume2 = WaterVolumeBase.GetWaterVolume<WaterVolumeAdd>(other);
				if (waterVolume2 != null && waterVolume2.EnablePhysics)
				{
					EnterWater(waterVolume2.Water);
				}
			}
		}

		public void OnTriggerExit(Collider other)
		{
			if (_CurrentWater == null)
			{
				WaterVolumeBase waterVolume = WaterVolumeBase.GetWaterVolume<WaterVolumeSubtract>(other);
				if (waterVolume != null && waterVolume.EnablePhysics)
				{
					ScanWaters();
				}
			}
			else
			{
				WaterVolumeBase waterVolume2 = WaterVolumeBase.GetWaterVolume<WaterVolumeAdd>(other);
				if (waterVolume2 != null && waterVolume2.Water == _CurrentWater && waterVolume2.EnablePhysics)
				{
					LeaveCurrentWater();
				}
			}
		}

		[ContextMenu("Refresh Probe")]
		private void ScanWaters()
		{
			Vector3 position = base.transform.position;
			List<Water> waters = ApplicationSingleton<WaterSystem>.Instance.Waters;
			int count = waters.Count;
			for (int i = 0; i < count; i++)
			{
				if (waters[i].Volume.IsPointInside(position, _Exclusions, _Size))
				{
					EnterWater(waters[i]);
					return;
				}
			}
			LeaveCurrentWater();
		}

		private void ScanBoundlessWaters()
		{
			Vector3 position = base.transform.position;
			List<Water> boundlessWaters = ApplicationSingleton<WaterSystem>.Instance.BoundlessWaters;
			int count = boundlessWaters.Count;
			for (int i = 0; i < count; i++)
			{
				Water water = boundlessWaters[i];
				if (water.Volume.IsPointInsideMainVolume(position) && water.Volume.IsPointInside(position, _Exclusions, _Size))
				{
					EnterWater(water);
					break;
				}
			}
		}

		private void EnterWater(Water water)
		{
			if (!(_CurrentWater == water))
			{
				if (_CurrentWater != null)
				{
					LeaveCurrentWater();
				}
				_CurrentWater = water;
				if (_Enter != null)
				{
					_Enter.Invoke();
				}
			}
		}

		private void LeaveCurrentWater()
		{
			if (_CurrentWater != null)
			{
				if (_Leave != null)
				{
					_Leave.Invoke();
				}
				_CurrentWater = null;
			}
		}
	}
}