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

namespace SLSUtilities.Rendering.PostProcessing
{
    [System.Serializable, VolumeComponentMenu("SLS/Postprocessing/Advanced Vignette")]
    public class AdvancedVignette : ScriptablePostProcessorVolume
    {
        // 放在最最后
        public override CustomPostProcessInjectionPoint InjectionPoint => CustomPostProcessInjectionPoint.AfterPostProcess;
        public override int OrderInInjectionPoint => 100;

        [Header("Gradient Colors")]
        [Tooltip("外部颜色（边缘）。最暗的地方显示的颜色。")]
        public ColorParameter colorOuter = new(Color.black, true, true, true);

        [Tooltip("内部颜色（过渡区）。\n当暗角开始出现时显示的颜色。\n设为与外部相同则为单色暗角。\n设为红色可做受伤效果。")]
        public ColorParameter colorInner = new(Color.black, true, true, true);

        [Header("Shape Settings")]
        [Tooltip("中心位置")]
        public Vector2Parameter center = new(new Vector2(0.5f, 0.5f));

        [Tooltip("强度。0 = 无效果")]
        public ClampedFloatParameter intensity = new(0f, 0f, 1f);

        [Tooltip("柔和度。控制渐变区域的宽度。")]
        public ClampedFloatParameter smoothness = new(0.5f, 0.01f, 1f);

        [Tooltip("圆度。1 = 圆形，0 = 方形。")]
        public ClampedFloatParameter roundness = new(1f, 0f, 1f);


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

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

            material.SetColor(InternalShaderHelpers.ID._ColorInner, colorInner.value);
            material.SetColor(InternalShaderHelpers.ID._ColorOuter, colorOuter.value);
            material.SetVector(InternalShaderHelpers.ID._VignetteCenter, center.value);

            // Pack Params
            Vector3 p1 = new Vector3(
                intensity.value,
                smoothness.value,
                roundness.value
            );
            
            material.SetVector(InternalShaderHelpers.ID._VignetteParams1, p1);

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

        public override bool IsActive()
        {
            return intensity.value > 0f;
        }
    }
}