using System.Collections.Generic;
using Godot;

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

    public Vector3 SectorOffset { get; set; }

    private bool reassigning = false;

    public GameObject(Sector sector, Vector3 localCoordinates)
    {
        CurrentSector = sector;
        LocalCoordinates = localCoordinates;

        GlobalCoordinates = new
        (
            sector.GlobalCenterCoordinates.X + (decimal)localCoordinates.X,
            sector.GlobalCenterCoordinates.Y + (decimal)localCoordinates.Y,
            sector.GlobalCenterCoordinates.Z + (decimal)localCoordinates.Z
        );
    }

    public GameObject(Sector sector, double localX, double localY, double localZ)
    {
        CurrentSector = sector;
        LocalCoordinates = new(localX, localY, localZ);

        GlobalCoordinates = new
        (
            sector.GlobalStartCoordinates.X + (decimal)localX,
            sector.GlobalStartCoordinates.Y + (decimal)localY,
            sector.GlobalStartCoordinates.Z + (decimal)localZ
        );
    }

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

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

    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))
            {
                sector.AssignObject(this);
                reassigning = true;
                return;
            }
        }

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

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

        SectorOffset = GetSectorOffset(GameManager.Singleton.GetCurrentSector());

        if (this is Character)
        {
            GameManager.Singleton.ApplyOrigin();
        }

        if (this is not Character)
        {
            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 virtual void UpdateSectorOffset(Sector sector)
    {
        SectorOffset = GetSectorOffset(sector);
    }

    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");
        return modulePrefab.Instantiate<Node3D>();
    }
}