#include "Rendering/Shadow/DirectionalShadowRuntime.h"

#include "Rendering/Execution/CameraFramePlan.h"
#include "Rendering/Shadow/DirectionalShadowData.h"

namespace XCEngine {
namespace Rendering {

bool DirectionalShadowRuntime::ResolveExecutionState(
    const CameraFramePlan& plan,
    DirectionalShadowExecutionState& outShadowState) {
    outShadowState = {};
    outShadowState.shadowCasterRequest = plan.shadowCaster;

    if (outShadowState.shadowCasterRequest.IsRequested()) {
        return outShadowState.shadowCasterRequest.IsValid();
    }

    if (!plan.directionalShadow.IsValid()) {
        return true;
    }

    const DirectionalShadowSurfaceAllocation* shadowAllocation =
        m_surfaceCache.Resolve(plan.request.context, plan.directionalShadow);
    if (shadowAllocation == nullptr || !shadowAllocation->IsValid()) {
        return false;
    }

    outShadowState.shadowCasterRequest.surface = shadowAllocation->surface;
    outShadowState.shadowCasterRequest.clearFlags = RenderClearFlags::Depth;
    if (!outShadowState.shadowCasterRequest.hasCameraDataOverride) {
        outShadowState.shadowCasterRequest.hasCameraDataOverride = true;
        outShadowState.shadowCasterRequest.cameraDataOverride = plan.directionalShadow.cameraData;
    }

    outShadowState.shadowData =
        BuildRenderDirectionalShadowData(
            plan.directionalShadow,
            shadowAllocation->depthShaderView);
    return true;
}

} // namespace Rendering
} // namespace XCEngine