using System.Collections.Generic;
using Unity.Collections;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.Rendering;

namespace Core.BRG
{
    public class BRGRender<T> : BRGRenderBasic where T : BGRGameObjectInfo
    {
        /// <summary>
        /// BRG容器对象
        /// </summary>
        // private BRGRenderBasic _mBrgRenderBasic;

        // private int m_itemCount;
        public bool isUpdate = true;

        public List<T> m_gameObjectInfos = new List<T>();

        private List<BatchShaderBind> m_batchShaderBinds = new List<BatchShaderBind>();

        public void InitRender(BRGSamples samples, List<T> gameObjectInfos)
        {
            this.m_gameObjectInfos = gameObjectInfos;

            int maxItemSize = samples.GetAllShaderValueSize();
            Init(samples, gameObjectInfos.Count, maxItemSize);
            UploadGpuData(gameObjectInfos.Count);
        }

        protected override NativeArray<MetadataValue> ProInitBatchMetadata(int startOffset,int m_maxInstancePerWindow)
        {
            NativeArray<MetadataValue> metadataValues =
                new NativeArray<MetadataValue>(m_samples.AllShaderValues.Count,Allocator.Temp, NativeArrayOptions.UninitializedMemory);
            m_batchShaderBinds.Clear();
            int count= m_gameObjectInfos.Count;
            for (int i = 0; i < m_samples.AllShaderValues.Count; i++)
            {
                // BRGShaderValue shaderValue = m_samples.AllShaderValues[i];
                // int shaderId = Shader.PropertyToID(shaderValue.);
                // BatchShaderBind batchShaderBind = new BatchShaderBind();
                // batchMetadata[0] = CreateMetadataValue(objectToWorldID, 0, true);
            }
            return base.ProInitBatchMetadata(startOffset,m_maxInstancePerWindow);
        }

      


        public void UpdatePos()
        {
            if (!isUpdate)
            {
                return;
            }

            int totalGpuBufferSize;
            int alignedWindowSize;
            NativeArray<float3x4> sysmemBuffer =
                GetSysmemBuffer(out totalGpuBufferSize, out alignedWindowSize);

            // 检查NativeArray是否有效
            if (!sysmemBuffer.IsCreated)
            {
                Debug.LogError("NativeArray has been deallocated or not created properly");
                return;
            }

            int m_itemCount = m_gameObjectInfos.Count;
            for (int i = 0; i < m_gameObjectInfos.Count; i++)
            {
                BGRGameObjectInfo info = m_gameObjectInfos[i];


                Matrix4x4 matrix4X4 = info.objectToWorld;
                float4x4 float3X4 = matrix4X4;

                sysmemBuffer[i] = new float3x4(
                    float3X4.c0.xyz, float3X4.c1.xyz,
                    float3X4.c2.xyz, float3X4.c3.xyz
                );
                float4x4 inverse = matrix4X4.inverse;

                sysmemBuffer[i + m_itemCount] = new float3x4(
                    inverse.c0.xyz, inverse.c1.xyz,
                    inverse.c2.xyz, inverse.c3.xyz
                );
            }

            // 每帧更新后重新上传数据到GPU
            UploadTransformData(m_itemCount);
        }
    }
}