using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Universal
{
    public abstract class RendererDrivenRenderPipeline
        : ScriptableRenderPipeline
    {
        protected RendererDrivenRenderPipeline()
        {
        }

        protected sealed override bool SupportsStageRenderGraph(
            CameraFrameStage stage)
        {
            return SupportsStageRenderGraphContextual(
                stage,
                -1);
        }

        protected sealed override bool SupportsStageRenderGraphContextual(
            CameraFrameStage stage,
            int rendererIndex)
        {
            return SupportsRendererRecording(
                new RendererRecordingContext(
                    stage,
                    rendererIndex));
        }

        protected sealed override bool RecordStageRenderGraph(
            ScriptableRenderContext context)
        {
            if (context == null)
            {
                return false;
            }

            return RecordRenderer(
                new RendererRecordingContext(context));
        }

        protected virtual bool SupportsRendererRecording(
            RendererRecordingContext context)
        {
            ScriptableRenderer renderer =
                ResolveRenderer(context);
            return renderer != null &&
                   renderer.SupportsRendererRecordingInstance(context);
        }

        protected virtual bool RecordRenderer(
            RendererRecordingContext context)
        {
            ScriptableRenderer renderer =
                ResolveRenderer(context);
            return renderer != null &&
                   renderer.RecordRendererInstance(context);
        }

        protected abstract ScriptableRenderer ResolveRenderer(
            RendererRecordingContext context);
    }
}