using System;
using Echovoid.Runtime.Behavior.Rendering;
using SLSUtilities.Rendering.PostProcessing;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace SLSUtilities.Rendering.PostProcessing
{
    [Serializable]
    [VolumeComponentMenu("SLS/Postprocessing/Pixelate")]
    [SupportedOnRenderPipeline(typeof(UniversalRenderPipelineAsset))]
    public class PixelateVolume : ScriptablePostProcessorVolume
    {
        public override CustomPostProcessInjectionPoint InjectionPoint => CustomPostProcessInjectionPoint.AfterPostProcess;
        public override int OrderInInjectionPoint => 100;
        
        [Tooltip("是否强制开启像素化效果")]
        public BoolParameter forceActive = new BoolParameter(false);

        [Tooltip("横向分辨率比例，0 到 1；1 为当前渲染分辨率")]
        public FloatParameter strengthX = new FloatParameter(1f);

        [Tooltip("纵向分辨率比例，0 到 1；1 为当前渲染分辨率")]
        public FloatParameter strengthY = new FloatParameter(1f);

        // 返回我们在 Shader 里定义的名字，保证管家可以据此获取材质
        public override string GetShaderName() => "Hidden/Custom/Pixelate";

        public override bool IsActive()
        {
            // 当激活开关开启时才执行后期渲染（节省平时不开时的性能）
            return forceActive.value;
        }

        public override void Render(CommandBuffer cmd, ref RenderingData renderingData, RTHandle source, RTHandle destination)
        {
            if (material == null) return;
            
            cmd.SetGlobalFloat(InternalShaderHelpers.ID._PixelateStrengthX, Mathf.Clamp01(strengthX.value));
            cmd.SetGlobalFloat(InternalShaderHelpers.ID._PixelateStrengthY, Mathf.Clamp01(strengthY.value));
            
            // 使用你的统一管家分发的 Blitter 进行优雅渲染
            Blitter.BlitCameraTexture(cmd, source, destination, material, 0);
        }
    }
}