using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using Cysharp.Threading.Tasks;
using UnityEngine;

namespace BITKit.Sensors
{
	public class SensorQueue : MonoBehaviour
	{
		internal static readonly ConcurrentDictionary<int,ISensor> Sensors=new();
		internal static readonly ConcurrentDictionary<int, float> LastDetectedTime = new();
		private static bool IsDirty;
		
		[SerializeField,ReadOnly] private int _position;
		
		public static void Register(int id,ISensor sensor)
		{
			Sensors.TryAdd(id,sensor);
			MarkDirty();
		}
		public static void UnRegister(int id)
		{
			Sensors.TryRemove(id);
			MarkDirty();
		}
		public static void MarkDirty()
		{
			IsDirty = true;
		}
		
		[SerializeReference,SubclassSelector] private ITicker ticker;

		private bool _isBusy;

		private void Start()
		{
			ticker.Add(OnTick);
			destroyCancellationToken.Register(Dispose);
		}
		private void Dispose()
		{
			ticker.Remove(OnTick);
		}
		private async void OnTick(float obj)
		{
			if (_isBusy) return;
			if (SensorGlobalSettings.Enabled is false) return;
			try
			{

				_isBusy = true;
				if(IsDirty)
				{
					_position = 0;
					IsDirty = false;
				}
	
			
				if (Sensors.Count is 0)
				{
					_isBusy = false;
					return;
				}
				
				var current = Sensors.ElementAt(_position++).Value;
			
				if (current.AutoUpdate)
				{
					
					var currentUpdateTime = LastDetectedTime.GetOrAdd(current.Id,Time.time);
					await current.Execute(Time.time-currentUpdateTime);
					LastDetectedTime.AddOrUpdate(current.Id,Time.time,UpdateValueFactory);
				
					if (destroyCancellationToken.IsCancellationRequested) {
						_isBusy = false;
						return;
					}
				}
				_position %= Sensors.Count;
				float UpdateValueFactory(int key, float old) => Time.time;
			}
			catch (Exception e)
			{
				BIT4Log.LogException(e);
			}
			_isBusy = false;
		}
	}

}