#ifndef OPENMW_COMPONENTS_ESM_REFID_HPP
#define OPENMW_COMPONENTS_ESM_REFID_HPP
#include <functional>
#include <iosfwd>
#include <string>

namespace ESM
{
    struct RefId
    {
        const static RefId sEmpty;
        bool empty() const { return mId.empty(); }
        void swap(RefId& rhs) { mId.swap(rhs.mId); }
        bool operator==(const RefId& rhs) const;
        bool operator<(const RefId& rhs) const { return mId < rhs.mId; }
        bool operator>(const RefId& rhs) const { return mId > rhs.mId; }

        friend std::ostream& operator<<(std::ostream& os, const RefId& dt);

        //The 2 following functions are used to move back and forth between string and RefID. Used for hard coded RefIds that are as string in the code.
        //For serialization, and display. Using explicit conversions make it very clear where in the code we need to convert from string to RefId and Vice versa.
        static RefId stringRefId(const std::string_view& id); 
        const std::string& getRefIdString() const { return mId; } 


    private:
        std::string mId;
    };
}

namespace std
{

    template <>
    struct hash<ESM::RefId>
    {
        std::size_t operator()(const ESM::RefId& k) const
        {
            return std::hash<std::string>()(k.getRefIdString());
        }
    };
}
#endif