using System.Diagnostics;
using Godot;

public class HexTile3D : Spatial
{
    public enum TileType
    {
        Undefined,
        Sand,
        Grass,
        DeepGrass
    }

    static public TileType[] ValidTileTypes = { TileType.Sand, TileType.Grass, TileType.DeepGrass };

    // scene nodes
    private MeshInstance _mesh;
    private StaticBody _staticBody;

    // signals
    [Signal]
    delegate void TileClicked(HexTile3D tile3d);

    [Signal]
    delegate void TileHovered(HexTile3D tile3d);

    // other member variables
    private SpatialMaterial _undefinedMaterial;
    private SpatialMaterial _sandMaterial;
    private SpatialMaterial _grassMaterial;
    private SpatialMaterial _deepGrassMaterial;
    private SpatialMaterial _previousMaterial;

    private HexGrid _hexGrid;

    public HexCell Cell = new HexCell();
    public bool IsMouseOver = false;
    public MeshInstance Mesh;

    public Vector2 OffsetCoords
    {
        get { return Cell.OffsetCoords; }

        set
        {
            Cell.OffsetCoords = value;
            Transform tile3dTransform = Transform;
            Vector2 cellPlaneCoords = _hexGrid.GetHexCenter(Cell);
            tile3dTransform.origin.x = cellPlaneCoords.x;
            tile3dTransform.origin.z = cellPlaneCoords.y;
            Transform = tile3dTransform;
        }
    }

    private TileType _type;

    public TileType Type
    {
        get { return _type; }

        set
        {
            _type = value;

//            switch (_type)
//            {
//                case TileType.Undefined:
//                    _mesh.SetSurfaceMaterial(0, _undefinedMaterial);
//                    break;                    
//                case TileType.Sand:
//                    _mesh.SetSurfaceMaterial(0, _sandMaterial);
//                    break;
//                case TileType.Grass:
//                    _mesh.SetSurfaceMaterial(0, _grassMaterial);
//                    break;
//                case TileType.DeepGrass:
//                    _mesh.SetSurfaceMaterial(0, _deepGrassMaterial);
//                    break;
//                default:
//                    GD.Print("Invalid tile type: " + value.ToString());
//                    break;
//            }
        }
    }

    HexTile3D()
    {
        _hexGrid = new HexGrid();
    }

    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        _mesh = GetNode<MeshInstance>("Mesh");
        _staticBody = GetNode<StaticBody>("StaticBody");

        _staticBody.Connect("input_event", this, nameof(OnAreaInputEvent));
        _staticBody.Connect("mouse_entered", this, nameof(OnAreaMouseEntered));
        _staticBody.Connect("mouse_exited", this, nameof(OnAreaMouseExited));

        _undefinedMaterial = GD.Load<SpatialMaterial>("res://materials/UndefinedTile.tres");
        _sandMaterial = GD.Load<SpatialMaterial>("res://materials/SandTile.tres");
        _grassMaterial = GD.Load<SpatialMaterial>("res://materials/GrassTile.tres");
        _deepGrassMaterial = GD.Load<SpatialMaterial>("res://materials/DeepGrassTile.tres");

        Mesh = GetNode<MeshInstance>("Mesh");     
        Debug.Assert(Mesh != null);
        
        this.Type = TileType.Undefined;
    }


    public void OnAreaInputEvent(Node camera, InputEvent inputEvent, Vector3 position, Vector3 normal,
        int shapeIndex)
    {
        if (IsMouseOver && inputEvent is InputEventMouseButton)
        {
            InputEventMouseButton mouseButtonEvent = (InputEventMouseButton)inputEvent;
            if (mouseButtonEvent.ButtonIndex == 1 && mouseButtonEvent.Pressed)
            {
                EmitSignal("TileClicked", this);
            }
        }
    }

    public void OnAreaMouseEntered()
    {
        IsMouseOver = true;
        _previousMaterial = (SpatialMaterial)_mesh.MaterialOverride;

        EmitSignal("TileHovered", this);
//        SpatialMaterial clonedMaterial = (SpatialMaterial)_mesh.GetSurfaceMaterial(0).Duplicate();
//        clonedMaterial.AlbedoColor = new Color(1, 0, 0);
//        _mesh.MaterialOverride = clonedMaterial;
    }

    public void OnAreaMouseExited()
    {
        IsMouseOver = false;
        _mesh.MaterialOverride = _previousMaterial;
    }

//  // Called every frame. 'delta' is the elapsed time since the previous frame.
//  public override void _Process(float delta)
//  {
//      
//  }
}