using Godot;
using System.Collections.Generic;

namespace Rokojori
{ 
  [Tool]
  [GlobalClass, Icon("res://addons/rokojori_action_library/Icons/Flash.svg") ]
  public partial class TemperatureGradient:GradientGenerator 
  {
    [Export]
    public Color baseColor;

    [Export( PropertyHint.Range, "0,1" )]
    public float centerPosition = 0.5f;

    [Export( PropertyHint.Range, "0,1" )]
    public float centerAttraction = 0.25f;

    [Export]
    public float temperaturePolarBlendRadius = 60f;

    [ExportGroup( "Start", "start")]
    [Export( PropertyHint.Range, "-180,180")]
    public float startTemperatureShift = 0;
    [Export( PropertyHint.Range, "-100,100")]
    public float startSaturationShift = 0;
    [Export( PropertyHint.Range, "-100,100")]
    public float startLightnessShift = 0;

    [ExportGroup( "End", "end")]
    [Export( PropertyHint.Range, "-180,180")]
    public float endTemperatureShift = 0;
    [Export( PropertyHint.Range, "-100,100")]
    public float endSaturationShift = 0;
    [Export( PropertyHint.Range, "-100,100")]
    public float endLightnessShift = 0;

    [ExportGroup("Output")]
    [ExportToolButton( "Show Output")]
    public Callable showOutputButton => Callable.From( ()=> outputGradient = GetGradient() );
    [Export]
    public Gradient outputGradient;

    [ExportGroup("Repeat")]
    
    [Export]
    public float repeat = 1f;

    [Export]
    public GradientExtensions.GradientRepeatMode repeatMode = GradientExtensions.GradientRepeatMode.Clamp;


    

    public override Gradient GetGradient()
    {
      var gradient = new Gradient();

      gradient.Colors =  
      [
        baseColor.ToHSL().ShiftTemperature( startTemperatureShift, startSaturationShift / 100f, startLightnessShift / 100f, temperaturePolarBlendRadius ),
        baseColor,
        baseColor.ToHSL().ShiftTemperature( endTemperatureShift, endSaturationShift / 100f, endLightnessShift / 100f, temperaturePolarBlendRadius ),
      ];

      gradient.Offsets = 
      [
         Mathf.Lerp( 0f, centerPosition, centerAttraction ),
         centerPosition, 
         Mathf.Lerp( 1f, centerPosition, centerAttraction ),
      ];

      return gradient;
    }
  }
}