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#ifndef __JE_COMMON_SUBSYSTEM_H__
#define __JE_COMMON_SUBSYSTEM_H__

#include "../utils/macros.h"

#include "singleton.hpp"

namespace JinEngine
{

    ///
    /// Subsystem class.
    ///
    template<class System>
    class Subsystem : public Singleton<System>
    {
    public: 
        ///
        /// Subsystem setting.
        ///
        struct Setting 
        {
        }; 

        typedef Setting SettingBase; 

        ///
        /// Initialize subsystem.
        /// 
        /// @param setting Subsystem setting.
        /// @return True if initialize sucessful, otherwise return false.
        ///
        bool start(const SettingBase* setting = nullptr)
        {
            static bool success = startSystem(setting);
            return success;
        }

        ///
        /// Quit subsystem.
        ///
        void quit()
        {
            // Call only once.
            static char __dummy__ = (quitSystem(), 1);
            Singleton<System>::destroy();
        }

        ///
        /// Subsystem constructor.
        ///
        Subsystem() {};

        /// 
        /// Subsystem destructor.
        ///
        virtual ~Subsystem() {}

    protected:
        ///
        /// Initializer callback.
        ///
        virtual bool startSystem(const Setting* setting) = 0;

        ///
        /// Quit subsystem callback.
        ///
        virtual void quitSystem() = 0;

    };

} // namespace JinEngine

#endif