#pragma once

#include "GLExtensions.h"
#include "RuntimeShaderArtifact.h"

#include <map>
#include <memory>
#include <string>
#include <vector>

class RuntimeTextTextureCache
{
public:
	RuntimeTextTextureCache() = default;
	RuntimeTextTextureCache(const RuntimeTextTextureCache&) = delete;
	RuntimeTextTextureCache& operator=(const RuntimeTextTextureCache&) = delete;
	~RuntimeTextTextureCache();

	bool Configure(const RuntimeShaderArtifact& artifact, std::string& error);
	void UpdateArtifactState(const RuntimeShaderArtifact& artifact);
	void RefreshTextTextures(RuntimeShaderArtifact* artifactState = nullptr);
	void BindTextTextures(GLuint program);
	void ShutdownGl();

	static void AssignSamplerUniforms(GLuint program, const RuntimeShaderArtifact& artifact);

private:
	struct TextTexture
	{
		std::string parameterId;
		std::string cachedText;
		std::shared_ptr<const std::vector<unsigned char>> cachedPixels;
		GLuint texture = 0;
		unsigned width = 0;
		unsigned height = 0;
		unsigned liveWidth = 1;
		unsigned maxLength = 64;
	};

	bool EnsureTextTexture(TextTexture& texture);
	const RuntimePreparedTextTexture* FindPreparedTexture(const std::string& parameterId) const;
	static void DestroyTexture(TextTexture& texture);

	RuntimeShaderArtifact mArtifact;
	std::vector<TextTexture> mTextTextures;
};