using System;
using System.Collections.Generic;
using Godot;

public abstract class GameObject
{
	public Guid UUID { get; set; }

	public Sector CurrentSector { get; protected set; }
	public Vector3 LocalCoordinates { get; protected set; }
	public Vector3Dec GlobalCoordinates { get; protected set; }

	public Vector3 SectorOffset { get; set; }

	protected bool reassigning = false;

	public GameObject(Sector sector, Vector3 localCoordinates)
	{
		UUID = Guid.NewGuid();

		CurrentSector = sector;
		LocalCoordinates = localCoordinates;

		GlobalCoordinates = CalculateGlobalCoordinates(sector.GlobalCenterCoordinates, localCoordinates);
	}

	public GameObject(Vector3Dec coordinates)
	{
		GlobalCoordinates = coordinates;
		UpdateSector();
	}

	public GameObject(decimal x, decimal y, decimal z)
	{
		GlobalCoordinates = new(x, y, z);
		UpdateSector();
	}

	public Vector3Dec CalculateGlobalCoordinates(Vector3Dec sectorCenter, Vector3 local)
	{
		return new
		(
			sectorCenter.X + (decimal)local.X,
			sectorCenter.Y + (decimal)local.Y,
			sectorCenter.Z + (decimal)local.Z
		);
	}

	public bool IsInCurrentSector()
	{
		return Helpers.IsInsideArea(CurrentSector.Size / 2, LocalCoordinates);
	}

	public void UpdateSector()
	{
		List<Sector> neighbours = CurrentSector.GetNeighbouringSectors();
		foreach (Sector sector in neighbours)
		{
			if (sector.IsObjectInSector(this))
			{
				reassigning = true;
				sector.AssignObject(this);
				return;
			}
		}

		if (!GameManager.GameUniverse.IsInside(CurrentSector.Coordinates, LocalCoordinates))
		{
			return;
		}

		foreach (Sector sector in GameManager.GameUniverse.Sectors)
		{
			if (sector.IsObjectInSector(this))
			{
				reassigning = true;
				sector.AssignObject(this);
				return;
			}
		}
	}

	public virtual void AssignSector(Sector sector)
	{
		CurrentSector = sector;
		ResetLocalCoordinates();

		UpdateSectorOffsetToMainPlayer();

		List<Sector> neighbours = GameManager.Singleton.GetCurrentSector().GetNeighbouringSectors();

		if (neighbours.Contains(sector))
		{
			GameManager.Singleton.Spawn(this);
		}
		else
		{
			GameManager.Singleton.Despawn(this);
		}

		reassigning = false;
	}

	public Vector3 GetSectorOffset(Sector sector)
	{
		Vector3Dec relative = CurrentSector.GlobalCenterCoordinates - sector.GlobalCenterCoordinates;
		return relative.ToVector3();
	}

	public void UpdateSectorOffset(Sector sector)
	{
		SectorOffset = GetSectorOffset(sector);
	}

	public void UpdateSectorOffsetToMainPlayer()
	{
		UpdateSectorOffset(GameManager.Singleton.GetCurrentSector());
	}

	public void SetCoordinatesFromGlobal(Vector3Dec globalCoordinates)
	{
		GlobalCoordinates = globalCoordinates;
		LocalCoordinates = (globalCoordinates - CurrentSector.GlobalCenterCoordinates).ToVector3();

		UpdateNodePosition();
	}

	public void SetCoordinatesFromLocal(Vector3 localCoordinates)
	{
		LocalCoordinates = localCoordinates;
		GlobalCoordinates = Vector3Dec.FromVector3(localCoordinates) + CurrentSector.GlobalCenterCoordinates;

		UpdateNodePosition();
	}

	public void ResetLocalCoordinates()
	{
		SetCoordinatesFromGlobal(GlobalCoordinates);
	}

	public virtual void UpdateNodePosition() { }

	public virtual void Simulate(double delta)
	{
		if (!reassigning && !IsInCurrentSector())
		{
			UpdateSector();
		}
	}

	public virtual Node3D Instantiate(Sector sector)
	{
		PackedScene modulePrefab = ResourceLoader.Load<PackedScene>("res://prefabs/gameObjects/node.tscn");
		Node3D instance = modulePrefab.Instantiate<Node3D>();

		instance.Name = $"GameObject-{UUID}";

		return instance;
	}
}