using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

public class OutlineRenderFeature : ScriptableRendererFeature
{
    class OutlinePass : ScriptableRenderPass
    {
        private RenderTargetHandle tempColorTexture;
        private Material outlineMaterial;
        private RenderTargetIdentifier cameraTarget;

        public OutlinePass(Material material)
        {
            outlineMaterial = material;
            tempColorTexture.Init("_TemporaryColorTexture");
        }

        public override void Configure(CommandBuffer cmd, RenderTextureDescriptor cameraTextureDescriptor)
        {
            cmd.GetTemporaryRT(tempColorTexture.id, cameraTextureDescriptor); // Create temp texture
            ConfigureTarget(tempColorTexture.Identifier());
        }

        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            if (outlineMaterial == null) return;

            CommandBuffer cmd = CommandBufferPool.Get("Outline Pass");
            cameraTarget = renderingData.cameraData.renderer.cameraColorTargetHandle; // ✅ Safe usage here

            Blit(cmd, cameraTarget, tempColorTexture.Identifier()); // Copy to temp texture
            Blit(cmd, tempColorTexture.Identifier(), cameraTarget, outlineMaterial); // Apply outline effect

            context.ExecuteCommandBuffer(cmd);
            CommandBufferPool.Release(cmd);
        }

        public override void OnCameraCleanup(CommandBuffer cmd)
        {
            cmd.ReleaseTemporaryRT(tempColorTexture.id); // Cleanup
        }
    }

    [SerializeField] private Material outlineMaterial;
    private OutlinePass outlinePass;

    public override void Create()
    {
        outlinePass = new OutlinePass(outlineMaterial)
        {
            renderPassEvent = RenderPassEvent.AfterRenderingOpaques // ✅ Executes after opaque objects
        };
    }

    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        if (outlinePass != null)
        {
            renderer.EnqueuePass(outlinePass);
        }
    }
}