#pragma once

class singleton;

class singleton_initliazer {
public:
    bool has_init(singleton* s);

    void init_singleton(singleton* s);

    template<class T>
    T* require() {
        auto instance = T::get();
        if (has_init(instance)) {
            return instance;
        }
        singletons_.push_back(instance);
        instance->init(*this);
        return instance;
    }

    std::vector<singleton*> singletons_{};
};

class CORE_API singleton_manager {
public:
    static singleton_manager* get() {
        static singleton_manager instance;
        return &instance;
    }

    void add(singleton* s);

    void init();
    void release() const;

private:
    std::vector<singleton*> singletons_;
};