/*
 * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 */

#ifndef TRINITY_OBJECTREGISTRY_H
#define TRINITY_OBJECTREGISTRY_H

#include "Define.h"
#include "Dynamic/UnorderedMap.h"
#include <ace/Singleton.h>

#include <string>
#include <vector>
#include <map>

/** ObjectRegistry holds all registry item of the same type
 */
template<class T, class Key = std::string>
class ObjectRegistry
{
    public:
        typedef std::map<Key, T *> RegistryMapType;

        /// Returns a registry item
        const T* GetRegistryItem(Key key) const
        {
            typename RegistryMapType::const_iterator iter = i_registeredObjects.find(key);
            return( iter == i_registeredObjects.end() ? NULL : iter->second );
        }

        /// Inserts a registry item
        bool InsertItem(T *obj, Key key, bool override = false)
        {
            typename RegistryMapType::iterator iter = i_registeredObjects.find(key);
            if ( iter != i_registeredObjects.end() )
            {
                if ( !override )
                    return false;
                delete iter->second;
                i_registeredObjects.erase(iter);
            }

            i_registeredObjects[key] = obj;
            return true;
        }

        /// Removes a registry item
        void RemoveItem(Key key, bool delete_object = true)
        {
            typename RegistryMapType::iterator iter = i_registeredObjects.find(key);
            if ( iter != i_registeredObjects.end() )
            {
                if ( delete_object )
                    delete iter->second;
                i_registeredObjects.erase(iter);
            }
        }

        /// Returns true if registry contains an item
        bool HasItem(Key key) const
        {
            return (i_registeredObjects.find(key) != i_registeredObjects.end());
        }

        /// Inefficiently return a vector of registered items
        unsigned int GetRegisteredItems(std::vector<Key> &l) const
        {
            unsigned int sz = l.size();
            l.resize(sz + i_registeredObjects.size());
            for (typename RegistryMapType::const_iterator iter = i_registeredObjects.begin(); iter != i_registeredObjects.end(); ++iter)
                l[sz++] = iter->first;
            return i_registeredObjects.size();
        }

        /// Return the map of registered items
        RegistryMapType const &GetRegisteredItems() const
        {
            return i_registeredObjects;
        }

        ObjectRegistry() { }
        ~ObjectRegistry()
        {
            for (typename RegistryMapType::iterator iter=i_registeredObjects.begin(); iter != i_registeredObjects.end(); ++iter)
                delete iter->second;
            i_registeredObjects.clear();
        }
    private:
        RegistryMapType i_registeredObjects;
};

#endif
