#pragma once

#include <vector>
#include <fstream>
#include <unordered_map>
#include <map>
#include <string>
#include "../../inc/gl/glew.h"

template<typename T>
class CompressedTexture
{
public:
	virtual ~CompressedTexture() {}

	// Uncompress and retrieve the texture (possibly from a certain index)
	virtual T operator[](size_t i) const = 0;
	virtual unsigned64 size() const = 0;

	virtual std::vector<T> GetTexture(size_t fromIndex = 0) = 0;
	// Compresses the texture, replacing everything after fromIndex by whatever is in texture
	virtual void SetTexture(const std::vector<T>& texture, size_t fromIndex = 0) = 0;
	// Replace all materials by other colors. This could be useful as some methods don't need to fully decompress and compress the whole texture to do this.
	virtual void ReplaceMaterials(const std::unordered_map<T, T>& replacers) = 0;
	virtual void Recompress() { SetTexture(GetTexture()); }

	virtual void ReadFromFile(std::istream& file) = 0;
	virtual void WriteToFile(std::ostream& file) const = 0;

	// Use this method to output the compressed texture as a vector of one byte characters
	virtual std::vector<unsigned8> GetTexturePool() const = 0;
	virtual size_t GetTexturePoolSize() const = 0;

	// Use this method to output any addition information that might be needed.
	virtual std::vector<unsigned8> GetAdditionalTexturePool() const { return std::vector<unsigned8>(); };
	virtual size_t GetAdditionalTexturePoolSize() const { return 0; };

	virtual std::map<std::string, std::string> GetAdditionalProperties() const = 0;
};