#pragma once

#include "ShaderTypes.h"

#include <filesystem>
#include <string>

class ShaderCompiler
{
public:
	ShaderCompiler(
		const std::filesystem::path& repoRoot,
		const std::filesystem::path& wrapperPath,
		const std::filesystem::path& generatedGlslPath,
		const std::filesystem::path& patchedGlslPath,
		unsigned maxTemporalHistoryFrames);

	bool BuildPassFragmentShaderSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& fragmentShaderSource, std::string& error) const;

private:
	bool BuildWrapperSlangSource(const ShaderPackage& shaderPackage, const ShaderPassDefinition& pass, std::string& wrapperSource, std::string& error) const;
	bool FindSlangCompiler(std::filesystem::path& compilerPath, std::string& error) const;
	bool RunSlangCompiler(const std::filesystem::path& wrapperPath, const std::filesystem::path& outputPath, std::string& error) const;
	bool PatchGeneratedGlsl(std::string& shaderText, std::string& error) const;
	std::string ReadTextFile(const std::filesystem::path& path, std::string& error) const;
	bool WriteTextFile(const std::filesystem::path& path, const std::string& contents, std::string& error) const;

private:
	std::filesystem::path mRepoRoot;
	std::filesystem::path mWrapperPath;
	std::filesystem::path mGeneratedGlslPath;
	std::filesystem::path mPatchedGlslPath;
	unsigned mMaxTemporalHistoryFrames;
};