#ifndef RESOURCE_MANAGER_CLASS
#define RESOURCE_MANAGER_CLASS

#include <string>
#include <unordered_map>
#include <vector>

#include <glm/glm.hpp>

class Texture;
class Font;
class MeshData;

// Owns every texture and font, so each file only loads once however many things use it.
// Sounds are cached by SoundSystem, rigs and animations by CharacterManager.
class ResourceManager {
public:
	ResourceManager() {}
	~ResourceManager();   // needs the GL context, delete this before the window
	ResourceManager(const ResourceManager&) = delete;

	// Returns nullptr and logs it if the file can't be loaded
	Texture* GetTexture(const std::string& path);
	Font* GetFont(const std::string& path);

	// Every mesh in a model file merged into one, in the file's own units. nullptr if it can't be read.
	const MeshData* GetMeshData(const std::string& path);

	// Just the meshes on the object called name in a model file, around that object's own origin rather than
	// where the file placed it. For pieces meant to be attached to something, like a weapon on a hand.
	const MeshData* GetMeshData(const std::string& path, const std::string& name);

	// The base color texture of the first material in a model file that has one, embedded in it or in a file
	// beside it. nullptr if it has none.
	Texture* GetModelTexture(const std::string& path);

	// Where the object called name sits in a model file, like an empty marking a gun's muzzle, in the same space
	// GetMeshData(path) puts the model in. False if the file has nothing called that.
	bool GetModelMarker(const std::string& path, const std::string& name, glm::mat4& transform);

	// Not cached, every call makes a new texture that's free to be edited
	Texture* CreateTexture(int width, int height);
	Texture* CopyTexture(const Texture& source);

private:
	std::unordered_map<std::string, Texture*> textures;
	std::unordered_map<std::string, Font*> fonts;
	std::unordered_map<std::string, MeshData*> meshes;
	std::unordered_map<std::string, std::pair<bool, glm::mat4>> markers;   // found or not, and where
	std::vector<Texture*> createdTextures;
};

#endif