ES-DE/es-core/src/resources/ResourceManager.h

//
//  ResourceManager.h
//
//  Handles the application resources (fonts, graphics, sounds etc.).
//  Loading and unloading of these files are done here.
//

#pragma once
#ifndef ES_CORE_RESOURCES_RESOURCE_MANAGER_H
#define ES_CORE_RESOURCES_RESOURCE_MANAGER_H

#include <list>
#include <memory>

// The ResourceManager exists to:
// Allow loading resources embedded into the executable like an actual file.
// Allow embedded resources to be optionally remapped to actual files for further customization.

struct ResourceData {
    const std::shared_ptr<unsigned char> ptr;
    const size_t length;
};

class ResourceManager;

class IReloadable
{
public:
    virtual void unload(std::shared_ptr<ResourceManager>& rm) = 0;
    virtual void reload(std::shared_ptr<ResourceManager>& rm) = 0;
};

class ResourceManager
{
public:
    static std::shared_ptr<ResourceManager>& getInstance();

    void addReloadable(std::weak_ptr<IReloadable> reloadable);

    void unloadAll();
    void reloadAll();

    std::string getResourcePath(const std::string& path) const;
    const ResourceData getFileData(const std::string& path) const;
    bool fileExists(const std::string& path) const;

private:
    ResourceManager();

    static std::shared_ptr<ResourceManager> sInstance;
    std::list< std::weak_ptr<IReloadable> > mReloadables;

    ResourceData loadFile(const std::string& path) const;
};

#endif // ES_CORE_RESOURCES_RESOURCE_MANAGER_H