using Godot;


namespace Rokojori
{  
  [Tool]
  [GlobalClass]
  public partial class GlowFlareVFXLayer:FlareVFXLayer
  {
    [Export( PropertyHint.Range, "1, 1000" )]
    public int numInstances = 1;

    [ExportGroup("Color")]
    [Export]
    public BoxedColorValue colorOverwrite;

    [Export]
    public float opacity = 1f;

    [Export]
    public CurveTexture opacityCurve = new CurveTexture().WithCurve( new Curve().WithValues( 1f, 1f ).WithLinearTangents() );

    [ExportGroup("Size")]

    [Export]
    public Vector2 size = Vector2.One;

    [Export]
    public float sizeXY = 1f;

    [Export]
    public float worldSizeScale = 1f;
    [Export]
    public float screenSizeScale = 1f;

    [Export( PropertyHint.Range, "0,1" )]
    public float worldSize_vs_screenSize = 1f;

    [ExportGroup("Screen Offset")]
    [Export]
    public Vector2 screenOffset = Vector2.Zero;
    [Export]
    public Vector2 screenOffsetSpreadPerLayer = Vector2.Zero;

    MeshInstance3D mesh;
    GlowFlareVFXLayer parent;
    GlowFlareAddMaterial glowMaterial;
    int _numInstances = 0;

    public override FlareVFXLayer Create( FlareVFX flareVFX )
    {
      var clone = Duplicate() as GlowFlareVFXLayer;

      clone.mesh = flareVFX.GetContainer().CreateChild<MeshInstance3D>();
      clone._numInstances = numInstances;
      clone.mesh.Mesh = MeshGeometry.UnitBillboardQuads( numInstances, 0f, 1f ).GenerateMesh();
      
      clone.glowMaterial = new GlowFlareAddMaterial();
      clone.mesh.SetSurfaceOverrideMaterial( 0, clone.glowMaterial );

      clone.parent = this;
      


      return clone;
    }

    public override void Update( FlareVFX flareVFX )
    {
      if ( _numInstances != parent.numInstances )
      {
        _numInstances = parent.numInstances;
        mesh.Mesh = MeshGeometry.UnitBillboardQuads( _numInstances, 0f, 1f ).GenerateMesh();
        
      }

      glowMaterial.color.Set( parent.colorOverwrite !=null ? parent.colorOverwrite.GetColorValue() : flareVFX.preset.mainColor );

      glowMaterial.opacity.Set( parent.opacity );
      glowMaterial.opacityCurve.Set( parent.opacityCurve );

      var size = parent.size * parent.sizeXY;
      glowMaterial.sizeX.Set( size.X );
      glowMaterial.sizeY.Set( size.Y );
      glowMaterial.worldSizeScale.Set( parent.worldSizeScale );
      glowMaterial.screenSizeScale.Set( parent.screenSizeScale );
      glowMaterial.worldSizeVsScreenSize.Set( parent.worldSize_vs_screenSize );

      glowMaterial.screenOffsetScale.Set( parent.screenOffset );
      glowMaterial.screenOffsetLayerSpread.Set( parent.screenOffsetSpreadPerLayer );

      


      
    }
  }
}