using System;
using System.Collections.Generic;
using System.Linq;
using Cysharp.Threading.Tasks;
#if UNITY_EDITOR
using UnityEditor;
using UnityEditor.UIElements;
#endif
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.Sensors
{
	/// <summary>
	/// 智能目标传感器,根据条件,智能选择目标
	/// </summary>
	public class SmartTargetSensor :MonoBehaviour,ISensor,IAction
	{
		/// <summary>
		/// 自动更新
		/// </summary>
		[Header(Constant.Header.Settings)]
		[SerializeField] private bool autoUpdate;
		
		/// <summary>
		/// 目标有效性验证
		/// </summary>
		[Header(Constant.Header.Providers)]
		[SerializeField,SerializeReference,SubclassSelector] private IValidityProvider validityProvider;

		/// <summary>
		/// 主传感器
		/// </summary>
		[Header(nameof(Sensor))]
		[SerializeField,SerializeReference,SubclassSelector] private ISensor sensor;
		
		#if UNITY_EDITOR
		[Header(Constant.Header.Debug)]
		[SerializeField] private Transform sensorTransform;
		#endif

		public IEnumerable<Transform> Get() =>CurrentTarget is not null ? new[] { CurrentTarget }:Enumerable.Empty<Transform>();
		public bool IsValid(Collider _collider) =>validityProvider?.IsValid(_collider) ?? true;
		public float GetDistance() => sensor.GetDistance();
		public Transform CurrentTarget { get; private set; }
		private readonly List<Transform> detected = new();

		public async UniTask Execute()
		{
			await sensor.Execute();
			var _detected = sensor.Get().ToList();
			if (_detected.Contains(CurrentTarget))
			{
				if (detected.Count is 1 && detected[0] == CurrentTarget)
				{
				}
				else
				{
					detected.Clear();
					detected.Add(CurrentTarget);
				}

				return;
			}
			CurrentTarget = _detected
				.Where(_transform => IsValid(_transform.GetComponent<Collider>()))
				.OrderBy(_transform => Vector3.Distance(transform.position, _transform.position))
				.FirstOrDefault();
		}

		private void Update()
		{
			if(autoUpdate)Execute().Forget();
		}

		void IAction.Execute()
		{
			Execute().Forget();
		}
		#if UNITY_EDITOR
		private void OnDrawGizmosSelected()
		{
			if (CurrentTarget is null) return;
			Gizmos.DrawLine(sensorTransform.position,CurrentTarget.position);
		}
#endif
	}
	#if UNITY_EDITOR
	[CustomEditor(typeof(SmartTargetSensor))]
	public class SmartTargetSensorInspector:BITInspector<SmartTargetSensor>
	{
		private ObjectField _objectField;
		public override VisualElement CreateInspectorGUI()
		{
			FillDefaultInspector();
			 
			CreateSubTitle("Editor Debug Field");

			_objectField = root.Create<ObjectField>();
			
			_objectField.objectType = typeof(Transform);

			_objectField.SetEnabled(false);
			
			return root;
		}

		protected override void OnUpdate()
		{
			if (_objectField is not null)
			{
				_objectField.value = agent.CurrentTarget;
			}
		}
	}
	#endif
}