// Copyright FlecsProj. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"

class UMaterial;
struct FShaderLabModel;

/**
 * Editor-only builder that turns a parsed FShaderLabModel into a UMaterial expression graph:
 * property parameter nodes + a Custom HLSL node for the Surface body wired into a Substrate
 * Slab BSDF (-> FrontMaterial), plus an optional Vertex Custom node for WPO/displacement/UVs.
 *
 * The build is fully deterministic for a given model (node creation order, input/output order,
 * generated HLSL) so the cook-time and editor-time graphs — and therefore the baked uniform
 * expression set — match.
 */
class USHADERLABEDITOR_API FShaderLabGraphBuilder
{
public:
	/**
	 * Clear `Material`'s expression graph and rebuild it from `Model`, applying settings
	 * (domain/blend/two-sided) and updating cached expression data. Does NOT trigger shader
	 * compilation — callers decide when to compile. Returns false with diagnostics on failure.
	 */
	static bool BuildInto(UMaterial& Material, const FShaderLabModel& Model, TArray<FString>& OutErrors);
};