using UnityEngine.VFX;

namespace UnityEngine.VFX.Utility
{
    [AddComponentMenu("VFX/Property Binders/Light Binder")]
    [VFXBinder("Utility/Light")]
    class VFXLightBinder : VFXBinderBase
    {
        public string ColorProperty { get { return (string)m_ColorProperty; } set { m_ColorProperty = value; } }
        public string BrightnessProperty { get { return (string)m_BrightnessProperty; } set { m_ColorProperty = value; } }
        public string RadiusProperty { get { return (string)m_RadiusProperty; } set { m_RadiusProperty = value; } }

        [VFXPropertyBinding("UnityEngine.Color"), SerializeField, UnityEngine.Serialization.FormerlySerializedAs("m_ColorParameter")]
        protected ExposedProperty m_ColorProperty = "Color";
        [VFXPropertyBinding("System.Single"), SerializeField, UnityEngine.Serialization.FormerlySerializedAs("m_BrightnessParameter")]
        protected ExposedProperty m_BrightnessProperty = "Brightness";
        [VFXPropertyBinding("System.Single"), SerializeField, UnityEngine.Serialization.FormerlySerializedAs("m_RadiusParameter")]
        protected ExposedProperty m_RadiusProperty = "Radius";
        public Light Target = null;

        public bool BindColor = true;
        public bool BindBrightness = false;
        public bool BindRadius = false;

        public override bool IsValid(VisualEffect component)
        {
            return Target != null
                && (!BindColor || component.HasVector4(ColorProperty))
                && (!BindBrightness || component.HasFloat(BrightnessProperty))
                && (!BindRadius || component.HasFloat(RadiusProperty))
            ;
        }

        public override void UpdateBinding(VisualEffect component)
        {
            if (BindColor)
                component.SetVector4(ColorProperty, Target.color);
            if (BindBrightness)
                component.SetFloat(BrightnessProperty, Target.intensity);
            if (BindRadius)
                component.SetFloat(RadiusProperty, Target.range);
        }

        public override string ToString()
        {
            return string.Format("Light : '{0}' -> {1}", m_ColorProperty, Target == null ? "(null)" : Target.name);
        }
    }
}