using Echovoid.Runtime.Behavior.Rendering;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

namespace SLSUtilities.Rendering.PostProcessing
{
    [System.Serializable, VolumeComponentMenu("SLS/Postprocessing/Anime ACES")]
    public class AnimeACES : ScriptablePostProcessorVolume
    {
        public override CustomPostProcessInjectionPoint InjectionPoint => CustomPostProcessInjectionPoint.AfterPostProcess;
        public override int OrderInInjectionPoint => 1000;

        [Header("Tone Settings")]
        [Tooltip("是否开启")]
        public BoolParameter enabled = new(false);
        
        [Tooltip("曝光度。如果画面太亮，请降低此值 (0.8 - 1.2)。")]
        public FloatParameter exposure = new(1.0f); // 默认降回 1.0

        [Tooltip("对比度。基于中灰(0.18)调整。值越高，黑的越黑，亮的越亮。")]
        public ClampedFloatParameter contrast = new(1.1f, 0f, 2f);

        [Tooltip("饱和度。建议 1.1 - 1.3 以获得鲜艳色彩。")]
        public ClampedFloatParameter saturation = new(1.15f, 0f, 2f);

        [Tooltip("色彩保留 (Hue Preservation)。\n0 = 标准ACES (皮肤泛白/胶片感)\n1 = 完美保色 (皮肤红润/卡通感)\n二次元建议 0.3 - 0.7。")]
        public ClampedFloatParameter huePreservation = new(0.5f, 0f, 1f);

        [Tooltip("色彩滤镜")]
        public ColorParameter colorFilter = new(Color.white, true, true, true);

        [Header("ACES Curve")]
        public ClampedFloatParameter coeffA = new(2.51f, 0f, 5f);
        public ClampedFloatParameter coeffB = new(0.03f, 0f, 1f);
        public ClampedFloatParameter coeffC = new(2.43f, 0f, 5f);
        public ClampedFloatParameter coeffD = new(0.59f, 0f, 1f);
        public ClampedFloatParameter coeffE = new(0.14f, 0f, 1f);

        public override string GetShaderName() => "SLS/Postprocessing/AnimeACES";

        public override void Render(CommandBuffer cmd, ref RenderingData renderingData, RTHandle source, RTHandle destination)
        {
            if (material == null) return;

            // 传入 w 分量作为 Hue Preservation
            material.SetVector(InternalShaderHelpers.ID._TonemapParams, new Vector4(exposure.value, contrast.value, saturation.value, huePreservation.value));
            
            material.SetVector(InternalShaderHelpers.ID._ACESCoeffs, new Vector4(coeffA.value, coeffB.value, coeffC.value, coeffD.value));
            material.SetFloat(InternalShaderHelpers.ID._ACES_E, coeffE.value);
            
            material.SetColor(InternalShaderHelpers.ID._ColorFilter, colorFilter.value);

            Blitter.BlitCameraTexture(cmd, source, destination, material, 0);
        }

        public override bool IsActive() => enabled.value;
    }
}