using System;
using UnityEditor.Graphing;
using UnityEditor.ShaderGraph.Internal;
using UnityEngine;

namespace UnityEditor.ShaderGraph
{
    [BlackboardInputInfo(80)]
    class SamplerStateShaderProperty : AbstractShaderProperty<TextureSamplerState>
    {
        public SamplerStateShaderProperty()
        {
            displayName = "SamplerState";
            value = new TextureSamplerState();
        }

        public override PropertyType propertyType => PropertyType.SamplerState;

        internal override bool isExposable => false;
        internal override bool isRenamable => false;

        public override TextureSamplerState value
        {
            get => base.value;
            set
            {
                overrideReferenceName = $"SamplerState_{value.filter}_{value.wrap}";
                base.value = value;
            }
        }

        internal override bool AllowHLSLDeclaration(HLSLDeclaration decl) => false; // disable UI, nothing to choose

        internal override void ForeachHLSLProperty(Action<HLSLProperty> action)
        {
            action(new HLSLProperty(HLSLType._SamplerState, referenceName, HLSLDeclaration.Global));
        }

        internal override string GetPropertyAsArgumentString()
        {
            return $"UnitySamplerState {referenceName}";
        }

        internal override string GetHLSLVariableName(bool isSubgraphProperty)
        {
            if (isSubgraphProperty)
                return referenceName;
            else
                return $"UnityBuildSamplerStateStruct({referenceName})";
        }

        internal override AbstractMaterialNode ToConcreteNode()
        {
            return new SamplerStateNode()
            {
                filter = value.filter,
                wrap = value.wrap
            };
        }

        internal override PreviewProperty GetPreviewMaterialProperty()
        {
            return default(PreviewProperty);
        }

        internal override ShaderInput Copy()
        {
            return new SamplerStateShaderProperty()
            {
                displayName = displayName,
                value = value,
            };
        }
    }
}