namespace UnityEngine.Experimental.Rendering.HDPipeline
{
    public class RenderPipelineResources : ScriptableObject
    {
#if UNITY_EDITOR
        public static string GetRenderPipelineResourcesPath()
        {
            return HDUtils.GetHDRenderPipelinePath() + "RenderPipelineResources/HDRenderPipelineResources.asset";
        }

        // TODO skybox/cubemap

        [UnityEditor.MenuItem("RenderPipeline/HDRenderPipeline/Create Resources Asset", false, 15)]
        static void CreateRenderPipelineResources()
        {
            var instance = CreateInstance<RenderPipelineResources>();

            string HDRenderPipelinePath = HDUtils.GetHDRenderPipelinePath();
            string PostProcessingPath = HDUtils.GetPostProcessingPath();

            instance.debugDisplayLatlongShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugDisplayLatlong.Shader");
            instance.debugViewMaterialGBufferShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugViewMaterialGBuffer.Shader");
            instance.debugViewTilesShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugViewTiles.Shader");
            instance.debugFullScreenShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugFullScreen.Shader");

            instance.deferredShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Lighting/Deferred.Shader");
            instance.screenSpaceAmbientOcclusionShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Lighting/AmbientOcclusion/ScreenSpaceAmbientOcclusion.Shader");
            instance.subsurfaceScatteringCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Material/Lit/Resources/SubsurfaceScattering.compute");
            instance.volumetricLightingCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/Volumetrics/Resources/VolumetricLighting.compute");
            instance.gaussianPyramidCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(PostProcessingPath + "Shaders/Builtins/GaussianDownsample.compute");
            instance.depthPyramidCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/DepthDownsample.compute");
            instance.copyChannelCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/CopyChannel.compute");

            instance.clearDispatchIndirectShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/cleardispatchindirect.compute");
            instance.buildDispatchIndirectShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/builddispatchindirect.compute");
            instance.buildScreenAABBShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/scrbound.compute");
            instance.buildPerTileLightListShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/lightlistbuild.compute");
            instance.buildPerBigTileLightListShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/lightlistbuild-bigtile.compute");
            instance.buildPerVoxelLightListShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/lightlistbuild-clustered.compute");
            instance.buildMaterialFlagsShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/materialflags.compute");
            instance.deferredComputeShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/Deferred.compute");

            instance.deferredDirectionalShadowComputeShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/DeferredDirectionalShadow.compute");

            // SceneSettings
            // These shaders don't need to be reference by RenderPipelineResource as they are not use at runtime (only to draw in editor)
            // instance.drawSssProfile = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "SceneSettings/DrawSssProfile.shader");
            // instance.drawTransmittanceGraphShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "SceneSettings/DrawTransmittanceGraph.shader");

            instance.cameraMotionVectors = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "RenderPipelineResources/CameraMotionVectors.shader");

            // Sky
            instance.blitCubemap = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Sky/BlitCubemap.shader");
            instance.buildProbabilityTables = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Sky/BuildProbabilityTables.compute");
            instance.computeGgxIblSampleData = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Sky/ComputeGgxIblSampleData.compute");
            instance.GGXConvolve = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Sky/GGXConvolve.shader");

            // Skybox/Cubemap is a builtin shader, must use Sahder.Find to access it. It is fine because we are in the editor
            instance.skyboxCubemap = Shader.Find("Skybox/Cubemap");

            UnityEditor.AssetDatabase.CreateAsset(instance, GetRenderPipelineResourcesPath());
            UnityEditor.AssetDatabase.SaveAssets();
            UnityEditor.AssetDatabase.Refresh();
        }
#endif
        // Debug
        public Shader debugDisplayLatlongShader;
        public Shader debugViewMaterialGBufferShader;
        public Shader debugViewTilesShader;
        public Shader debugFullScreenShader;

        // Lighting resources
        public Shader deferredShader;
        public Shader screenSpaceAmbientOcclusionShader;
        public ComputeShader subsurfaceScatteringCS;
        public ComputeShader volumetricLightingCS;
        public ComputeShader gaussianPyramidCS;
        public ComputeShader depthPyramidCS;
        public ComputeShader copyChannelCS;

        // Lighting tile pass resources
        public ComputeShader clearDispatchIndirectShader;
        public ComputeShader buildDispatchIndirectShader;
        public ComputeShader buildScreenAABBShader;
        public ComputeShader buildPerTileLightListShader;     // FPTL
        public ComputeShader buildPerBigTileLightListShader;
        public ComputeShader buildPerVoxelLightListShader;    // clustered
        public ComputeShader buildMaterialFlagsShader;
        public ComputeShader deferredComputeShader;
        public ComputeShader deferredDirectionalShadowComputeShader;

        // SceneSettings
        // These shaders don't need to be reference by RenderPipelineResource as they are not use at runtime (only to draw in editor)
        // public Shader drawSssProfile;
        // public Shader drawTransmittanceGraphShader;

        public Shader cameraMotionVectors;

        // Sky
        public Shader blitCubemap;
        public ComputeShader buildProbabilityTables;
        public ComputeShader computeGgxIblSampleData;
        public Shader GGXConvolve;

        public Shader skyboxCubemap;

        public int copyChannelKernel_xyzw2x { get; private set; }

        public void OnEnable()
        {
            copyChannelKernel_xyzw2x = -1;

            if (copyChannelCS != null)
            {
                copyChannelKernel_xyzw2x = copyChannelCS.FindKernel("KSampleCopy4_1_x");
            }
        }
    }
}