// ***********************************************************************
// Assembly         : Game
// Author           : Kimch
// Created          : 2020-09-02
// Description      :
// Last Modified By : 
// Last Modified On : 
// ***********************************************************************
// <copyright file= "Cha_Auto" company="Kimch"></copyright>
// <summary></summary>
// ***********************************************************************
using System;
using UnityEngine;

namespace G
{
	/// <summary>
	/// 
	/// </summary>
	public class Cha_Auto : MonoBehaviour
	{
		[Flags]
		public enum AutoType
		{
			None,
			SelectTarget = 0x1,
			AttackTarget = 0x2,
			CastSkill = 0x4,
			All = -1,
		}

		#region Field

		/// <summary>
		/// 自己选择目标
		/// </summary>
		public float selectTargetRange = 0.5f;


		public Transform selectCenter;
		public Transform selectCircle;

		/// <summary>
		/// 最近目标
		/// </summary>
		private Transform _nearestTarget;
		/// <summary>
		/// 性能考虑
		/// </summary>
		private float _lastUpdateTime;

		/// <summary>
		/// 
		/// </summary>
		private EntityMainPlayer _scriptCha;

		/// <summary>
		/// 
		/// </summary>
		private AutoType _autoType;

		#endregion

		#region Property

		public Transform nearestTarget
		{
			get => _nearestTarget;
		}

		/// <summary>
		/// 自动攻击目标
		/// </summary>
		public bool autoAttackTarget
		{
			get => _scriptCha.autoAttack;
		}

		/// <summary>
		/// 自动施放技能
		/// </summary>
		public bool autoCastSkill => _scriptCha.autoCastSkill;

		#endregion

		#region Method

		/// <summary>
		/// 
		/// </summary>
		/// <param name="autoType"></param>
		public void StartAuto(AutoType autoType = AutoType.All)
		{
			_autoType = autoType;
		}

		/// <summary>
		/// 
		/// </summary>
		public void StopAuto()
		{
			_autoType = AutoType.None;
		}

		private void AutoSelectTarget()
		{
			if (selectTargetRange < float.Epsilon)
			{
				_nearestTarget = null;
				return;
			}

			var minSM = selectTargetRange * selectTargetRange;
			var chaP = (selectCenter ?? this.transform).position;

			//优先选择boss
			var bosses = EntityManager.Instance.FindAllBossInScene();
			if (bosses != null && bosses.Count > 0)
			{
				foreach (var boss in bosses)
				{
					var tarT = boss.transform;
					var curSM = Vector3.SqrMagnitude(chaP - tarT.position);
					if (curSM < minSM)
					{
						minSM = curSM;
						_nearestTarget = tarT;
					}
				}
			}

			//小怪
			var minions = EntityManager.Instance.FindAllMinionInScene();
			if (minions != null && minions.Count > 0)
			{
				foreach (var minion in minions)
				{
					if (minion.gameObject.layer == GameLayer.UnitLayer)
					{
						var tarT = minion.transform;
						var curSM = Vector3.SqrMagnitude(chaP - tarT.position);
						if (curSM < minSM)
						{
							minSM = curSM;
							_nearestTarget = tarT;
						}
					}
				}
			}

			//选择攻击目标
			if (_nearestTarget)
			{
				_scriptCha.AutoSelectTarget(_nearestTarget);
				return;
			}
			//道具
			var props = EntityManager.Instance.FindAllPropInScene();
			if (props != null && props.Count > 0)
			{
				foreach (var prop in props)
				{
					var tarT = prop.transform;
					var curSM = Vector3.SqrMagnitude(chaP - tarT.position);
					if (curSM < minSM)
					{
						minSM = curSM;
						_nearestTarget = tarT;
					}
				}
			}
			//选择道具
			if (_nearestTarget)
			{
				_scriptCha.AutoSelectProp(_nearestTarget);
				_nearestTarget = null;
				return;
			}
		}

		/// <summary>
		/// 
		/// </summary>
		private void AutoAttackTarget()
		{
			if (autoAttackTarget)
			{
				if (_nearestTarget)
					_scriptCha.AutoAttackTarget(_nearestTarget);
				else
					_scriptCha.AutoFindPortal();
			}
		}

		/// <summary>
		/// 
		/// </summary>
		private void AutoCastSkill()
		{
			if (autoCastSkill && _nearestTarget)
			{
				_scriptCha.AutoCastSkill();
			}
		}

		private void AutoStudySkill()
		{

		}

		private void AutoOpenBox()
		{

		}

		private void AutoFindPortal()
		{

		}

		private void UpdateAuto()
		{
			if (GameLevel.Instance.levelFinish)
				return;

			if (_autoType.HasFlag(AutoType.SelectTarget))
				AutoSelectTarget();
			if (_autoType.HasFlag(AutoType.AttackTarget))
			{
				AutoAttackTarget();
				AutoFindPortal();
			}
			if (_autoType.HasFlag(AutoType.CastSkill))
			{
				AutoCastSkill();

				AutoStudySkill();
				AutoOpenBox();
				AutoFindPortal();
			}
		}

		#endregion

		private void Awake()
		{
			_scriptCha = GetComponent<EntityMainPlayer>();
		}

		private void Update()
		{
			if (_autoType == AutoType.None)
				return;

			if (Time.time - _lastUpdateTime > 0.05f)
			{
				_lastUpdateTime = Time.time;
				UpdateAuto();
			}

			if (_nearestTarget)
			{
				var tarP = _nearestTarget.position;
				tarP.y = 0.01f;
				selectCircle.transform.position = tarP;

				var tarR = _nearestTarget.rotation.eulerAngles;
				tarR.x = 90f;
				tarR.z = 0f;
				selectCircle.transform.eulerAngles = tarR;
			}
			else
			{
				selectCircle.transform.position = new Vector3(0, -100, 0);
			}
		}
	}
}