using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using UnityEngine;

namespace BITKit.WorldNodes
{
	public interface IWorldNodeService
	{
		IWorldNode[] WorldNodes { get; }
		IWorldNode[] GetNodes(Vector3 position, float radius);
		IWorldNode[] GetConnectedNodes(IWorldNode node);
	}
	public abstract class WorldNodeServiceImplementation : IWorldNodeService
	{
		protected virtual IWorldNodeService Service { get; }

		public IWorldNode[] WorldNodes => Service.WorldNodes;

		public IWorldNode[] GetNodes(Vector3 position, float radius)
		{
			return Service.GetNodes(position, radius);
		}

		public IWorldNode[] GetConnectedNodes(IWorldNode node)
		{
			return Service.GetConnectedNodes(node);
		}
	}
	[ExecuteInEditMode]
	public class WorldNodeService : MonoBehaviour,IWorldNodeService
	{
		public static event Action OnDrawGizmo;
		public static readonly CacheList<IWorldNode> WorldNodeList = new();
		public static IWorldNode[] WorldNodes => WorldNodeList.ValueArray;
		public static IWorldNode[] GetNodes(Vector3 position, float radius)
		{
			return WorldNodes.Where(node => InRange(position, node, radius))
				.Where(node => InSight(position, node))
				.ToArray();
		}
		public static IWorldNode[] GetConnectedNodes(IWorldNode node)
		{
			throw new System.NotImplementedException();
		}
		private static bool InRange(Vector3 position, IWorldNode node, float radius)
		{
			return Vector3.Distance(position, node.Position) <= radius;
		}
		private static bool InSight(Vector3 position, IWorldNode node)
		{
			if (Physics.Linecast(position, node.Position, out var hit))
			{
				return hit.transform == node.As<MonoBehaviour>().transform;
			}
			return true;
		}

		IWorldNode[] IWorldNodeService.WorldNodes => WorldNodes;
		IWorldNode[] IWorldNodeService.GetNodes(Vector3 position, float radius)
		{
			return GetNodes(position, radius);
		}
		IWorldNode[] IWorldNodeService.GetConnectedNodes(IWorldNode node)
		{
			return GetConnectedNodes(node);
		}

		private void OnDrawGizmos()
		{
			OnDrawGizmo?.Invoke();
		}

		private void Reset()
		{
			WorldNodeList.Clear();
		}
	}

}