using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Universal
{
    internal sealed class UniversalShadowCasterBlock
    {
        private readonly DrawObjectsPass m_drawShadowCasterPass =
            new DrawObjectsPass(
                RenderPassEvent.BeforeRenderingShadows,
                SceneRenderPhase.Opaque,
                RendererListDesc.CreateDefault(
                    RendererListType.ShadowCaster));

        public void ConfigureCameraFramePlan(
            ScriptableRenderPipelinePlanningContext context,
            ShadowCasterBlockData shadowCaster)
        {
            if (context == null)
            {
                return;
            }

            if (shadowCaster != null &&
                shadowCaster.enabled)
            {
                context.RequestShadowCasterStage();
                return;
            }

            context.ClearShadowCasterStage();
        }

        public void ConfigureDirectionalShadowExecutionState(
            DirectionalShadowExecutionContext context,
            ShadowCasterBlockData shadowCaster)
        {
            if (context == null)
            {
                return;
            }

            if (!context.hasPlannedMainDirectionalShadow ||
                shadowCaster == null ||
                !shadowCaster.enabled)
            {
                context.ClearDirectionalShadowExecution();
                return;
            }

            context.UseDefaultMainDirectionalShadowExecution();
        }

        public void EnqueueRenderPasses(
            ScriptableRenderer renderer,
            ShadowCasterBlockData shadowCaster)
        {
            if (renderer == null ||
                shadowCaster == null ||
                !shadowCaster.enabled)
            {
                return;
            }

            m_drawShadowCasterPass.Configure(
                shadowCaster.passEvent,
                SceneRenderPhase.Opaque,
                shadowCaster.rendererListDesc,
                shadowCaster.drawingSettings);
            renderer.EnqueuePass(m_drawShadowCasterPass);
        }
    }
}