/*
 * Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
 * Copyright (C) 2009-2011 MaNGOSZero <https://github.com/mangos/zero>
 * Copyright (C) 2011-2016 Nostalrius <https://nostalrius.org>
 * Copyright (C) 2016-2017 Elysium Project <https://github.com/elysium-project>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef MANGOS_OBJECTREGISTRY_H
#define MANGOS_OBJECTREGISTRY_H

#include "Platform/Define.h"
#include "Utilities/UnorderedMapSet.h"
#include "Policies/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 MANGOS_DLL_DECL 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 replace = false)
 {
 typename RegistryMapType::iterator iter = i_registeredObjects.find(key);
 if( iter != i_registeredObjects.end() )
 {
 if( !replace )
 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;
 }

 private:
 RegistryMapType i_registeredObjects;
 friend class MaNGOS::OperatorNew<ObjectRegistry<T, Key> >;

 // protected for friend use since it should be a singleton
 ObjectRegistry() {}
 ~ObjectRegistry()
 {
 for(typename RegistryMapType::iterator iter=i_registeredObjects.begin(); iter != i_registeredObjects.end(); ++iter)
 delete iter->second;
 i_registeredObjects.clear();
 }
};
#endif