FeatherMC/src/config/Property.h

#pragma once

#include "Properties.h"
#include "ServerProperties.h"

#include <string>
#include <string_view>
#include <unordered_map>
#include <functional>
#include <ostream>

using std::string;
using std::string_view;
using std::unordered_map;

namespace Feather::Config
{

    template <typename T>
    class Property
    {
    public:
        Property(string_view key) : key(key) {}
        Property(string_view key, T defaultValue) : key(key), value(defaultValue) {}
        Property(string_view key, std::function<T(T)> op, T defaultValue) : key(key), value(defaultValue), op(op) {}

        void Init(Properties *properties)
        {
            try
            {
                SetValue(properties->Get<T>(key));
            }
            catch (const std::out_of_range& err)
            {
                // ignore unreferenced local var
                (void)err;

                // process default value from constructor
                SetValue(value);
            }
        }

        void SetValue(T value)
        {
            if (op) {
                this->value = op(value);
            } else {
                this->value = value;
            }
        }

        T GetValue() { return value; }

        // Property<T> can be automatically cast to T
        inline operator T() const { return value; }

        inline string ToString() const { return std::to_string(value); }

        string_view key;
    private:
        T value = T();
        std::function<T(T)> op;
    };

    template <>
    inline string Property<string>::ToString() const
    {
        return value;
    }

    template <>
    inline string Property<bool>::ToString() const
    {
        return value ? "true" : "false";
    }

    template <typename T>
    std::ostream& operator<<(std::ostream& os, const Property<T>& prop)
    {
        os << prop.key << "=" << prop.ToString();
        return os;
    }
}