using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Runtime.Remoting;
using BITKit;
using BITKit.Entities;
using Microsoft.Extensions.DependencyInjection;
using Unity.Collections;
using Unity.Jobs;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.Jobs;

namespace Net.BITKit.Quadtree
{
    public abstract class QuadTreeService
    {
        public static HashSet<object> Instances = new();
        public readonly Quadtree Quadtree = new(default,new float2(2048,2048));
    }
    public class QuadTreeService<T>:QuadTreeService,IDisposable where T : class
    {

        private readonly IEntitiesService _entitiesService;
        private readonly Dictionary<int, Transform> _transforms = new();
        private readonly ITicker _ticker;
        public QuadTreeService(IEntitiesService entitiesService, ITicker ticker)
        {
            _entitiesService = entitiesService;
            _ticker = ticker;

            _entitiesService.OnAdd += OnAdd;
            _entitiesService.OnRemove += OnRemove;

            foreach (var (entity,t) in _entitiesService.QueryComponents<IEntity,T>())
            {
                OnAdd(entity,t);
            }
            
            _ticker.Add(OnTick);

            Instances.Add(this);
        }

        private void OnTick(float obj)
        {
            foreach (var (id, transform) in _transforms)
            {
                Quadtree.Remove(id);
                Quadtree.Insert(id, ((float3)transform.position).xz);
            }
        }

        private void OnRemove(IEntity obj)
        {
            _transforms.TryRemove(obj.Id);
            Quadtree.Remove(obj.Id);
        }

        private void OnAdd(IEntity obj)
        {
            if (obj.ServiceProvider.GetService<T>() is { } t)
            {
                OnAdd(obj,t);
            }
        }

        private void OnAdd(IEntity entity, T t)
        {
            _transforms.TryAdd(entity.Id, entity.ServiceProvider.GetRequiredService<Transform>());
        }

        public void Dispose()
        {
            _entitiesService.OnAdd -= OnAdd;
            _entitiesService.OnRemove -= OnRemove;
            
            _ticker.Remove(OnTick);
            
            Instances.Remove(this);
        }
    }

}