using Rokojori;
using Godot;

namespace Rokojori;

[GlobalClass,Tool]
public abstract partial class AdjustmentsMask: Resource
{
  public enum Mode
  {
    Add,
    Subtract,
    Multiply,
    Divide,
    Max,
    Min
  }

  [Export]
  public Mode mode = Mode.Multiply;

  public abstract float GetMask( Color rgb );
  
  public static float Blend( AdjustmentsMask bottom, float bottomMask, AdjustmentsMask top, float topMask )
  {
    if ( bottom == null )
    {
      return bottomMask;
    }

    if ( Mode.Add == top.mode )
    {
      return bottomMask + topMask;
    }

    if ( Mode.Subtract == top.mode )
    {
      return bottomMask - topMask;
    }

    if ( Mode.Multiply == top.mode )
    {
      return bottomMask * topMask;
    }

    if ( Mode.Divide == top.mode )
    {
      return bottomMask / topMask;
    }

    if ( Mode.Max == top.mode )
    {
      return Mathf.Max( bottomMask, topMask );
    }

    if ( Mode.Min == top.mode )
    {
      return Mathf.Min( bottomMask, topMask );
    }

    return 0;
  }
}