using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Kav
{
    public class DeferredPBR_SpotLightEffect : Effect
    {
        EffectParameter gPositionParam;
        EffectParameter gAlbedoParam;
        EffectParameter gNormalParam;
        EffectParameter gMetallicRoughnessParam;
        EffectParameter shadowMapParam;

        EffectParameter eyePositionParam;

        EffectParameter lightPositionParam;
        EffectParameter lightDirectionParam;
        EffectParameter lightColorParam;
        EffectParameter lightCutoffParam;

        EffectParameter farPlaneParam;

        public Texture2D GPosition { get; set; }
        public Texture2D GAlbedo { get; set; }
        public Texture2D GNormal { get; set; }
        public Texture2D GMetallicRoughness { get; set; }
        public TextureCube ShadowMap { get; set; }

        public Vector3 EyePosition { get; set; }

        public Vector3 LightPosition { get; set; }
        public Vector3 LightDirection { get; set; }
        public Vector3 LightColor { get; set; }
        public float LightCutoff { get; set; } //could be named lightangle?

        public float FarPlane { get; set; }

        public DeferredPBR_SpotLightEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.DeferredPBR_SpotLightEffect)
        {
            CacheEffectParameters();
        }

        protected override void OnApply()
        {
            gPositionParam.SetValue(GPosition);
            gAlbedoParam.SetValue(GAlbedo);
            gNormalParam.SetValue(GNormal);
            gMetallicRoughnessParam.SetValue(GMetallicRoughness);
            shadowMapParam.SetValue(ShadowMap);

            eyePositionParam.SetValue(EyePosition);

            lightPositionParam.SetValue(LightPosition);
            lightDirectionParam.SetValue(LightDirection);
            lightColorParam.SetValue(LightColor);
            lightCutoffParam.SetValue(LightCutoff);

            farPlaneParam.SetValue(FarPlane);
        }

        private void CacheEffectParameters()
        {
            gPositionParam            = Parameters["gPosition"];
            gAlbedoParam              = Parameters["gAlbedo"];
            gNormalParam              = Parameters["gNormal"];
            gMetallicRoughnessParam   = Parameters["gMetallicRoughness"];
            shadowMapParam            = Parameters["shadowMap"];

            eyePositionParam          = Parameters["EyePosition"];

            lightPositionParam        = Parameters["LightPosition"];
            lightDirectionParam       = Parameters["LightDirection"];
            lightColorParam           = Parameters["LightColor"];
            lightCutoffParam          = Parameters["LightCutoff"];

            farPlaneParam             = Parameters["FarPlane"];
        }
    }
}