datafilemanager.h

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#ifndef DATAFILEMANAGER_H
#define DATAFILEMANAGER_H
 
#include <memory>
#include <string>
#include <type_traits>
#include <unordered_map>
#include "datafilebase.h"
 
namespace Nickvision::App
{
    template<typename T>
    concept DerivedDataFileBase = std::is_base_of_v<DataFileBase, T>;
 
    class DataFileManager
    {
    public:
        DataFileManager(const std::string& appName);
        // Delete copy and move constructors and assignment operators
        DataFileManager(const DataFileManager&) = delete;
        DataFileManager(DataFileManager&&) = delete;
        void operator=(const DataFileManager&) = delete;
        void operator=(DataFileManager&&) = delete;
        template<DerivedDataFileBase T>
        T& get(const std::string& key)
        {
            if (key.empty())
            {
                throw std::invalid_argument("Key must not be empty.");
            }
            if (!m_files.contains(key))
            {
                m_files[key] = std::make_unique<T>(key, m_appName);
            }
            return *static_cast<T*>(m_files[key].get());
        }
 
    private:
        std::string m_appName;
        std::unordered_map<std::string, std::unique_ptr<DataFileBase>> m_files;
    };
}
 
#endif //DATAFILEMANAGER_H