using System;
using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Universal
{
    public class UniversalRendererData : ScriptableRendererData
    {
        public UniversalMainSceneData mainScene;
        public ShadowCasterBlockData shadowCaster;
        public DepthPrepassBlockData depthPrepass;

        public UniversalRendererData()
            : this(true)
        {
        }

        protected UniversalRendererData(
            bool initializeDefaultRendererFeatures)
        {
            mainScene = UniversalMainSceneData.CreateDefault();
            shadowCaster = ShadowCasterBlockData.CreateDefault();
            depthPrepass = DepthPrepassBlockData.CreateDefault();
            if (initializeDefaultRendererFeatures)
            {
                ResetRendererFeaturesToDefault();
            }
        }

        protected override ScriptableRenderer CreateRenderer()
        {
            return new UniversalRenderer(this);
        }

        protected override int ComputeRuntimeStateHash()
        {
            int hash =
                base.ComputeRuntimeStateHash();
            hash =
                AppendMainSceneRuntimeStateHash(
                    hash,
                    GetMainSceneInstance());
            hash =
                AppendShadowCasterRuntimeStateHash(
                    hash,
                    GetShadowCasterBlockInstance());
            hash =
                AppendDepthPrepassRuntimeStateHash(
                    hash,
                    GetDepthPrepassBlockInstance());
            return hash;
        }

        protected override ScriptableRendererFeature[]
        CreateDefaultRendererFeatures()
        {
            return UniversalDefaultRendererFeatureFactory
                .CreateDefaultRendererFeatures();
        }

        internal UniversalMainSceneData GetMainSceneInstance()
        {
            if (mainScene == null)
            {
                mainScene =
                    UniversalMainSceneData.CreateDefault();
            }

            return mainScene;
        }

        internal ShadowCasterBlockData GetShadowCasterBlockInstance()
        {
            if (shadowCaster == null)
            {
                shadowCaster =
                    ShadowCasterBlockData.CreateDefault();
            }

            return shadowCaster;
        }

        internal DepthPrepassBlockData GetDepthPrepassBlockInstance()
        {
            if (depthPrepass == null)
            {
                depthPrepass =
                    DepthPrepassBlockData.CreateDefault();
            }

            return depthPrepass;
        }

        private static int AppendMainSceneRuntimeStateHash(
            int hash,
            UniversalMainSceneData data)
        {
            hash = RuntimeStateHashUtility.Combine(hash, data != null);
            if (data == null)
            {
                return hash;
            }

            hash = RuntimeStateHashUtility.Combine(hash, data.renderOpaque);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    (int)data.opaquePassEvent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.opaqueRendererListDesc);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.opaqueDrawingSettings);
            hash = RuntimeStateHashUtility.Combine(hash, data.renderSkybox);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    (int)data.skyboxPassEvent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.renderTransparent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    (int)data.transparentPassEvent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.transparentRendererListDesc);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.transparentDrawingSettings);
            return hash;
        }

        private static int AppendShadowCasterRuntimeStateHash(
            int hash,
            ShadowCasterBlockData data)
        {
            hash = RuntimeStateHashUtility.Combine(hash, data != null);
            if (data == null)
            {
                return hash;
            }

            hash = RuntimeStateHashUtility.Combine(hash, data.enabled);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    (int)data.passEvent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.rendererListDesc);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.drawingSettings);
            return hash;
        }

        private static int AppendDepthPrepassRuntimeStateHash(
            int hash,
            DepthPrepassBlockData data)
        {
            hash = RuntimeStateHashUtility.Combine(hash, data != null);
            if (data == null)
            {
                return hash;
            }

            hash = RuntimeStateHashUtility.Combine(hash, data.enabled);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    (int)data.passEvent);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.rendererListDesc);
            hash =
                RuntimeStateHashUtility.Combine(
                    hash,
                    data.drawingSettings);
            return hash;
        }
    }
}