/**
 * @file   factory.hpp
 * @author Julian Iseringhausen <isering@ins.uni-bonn.de>
 * @date   Tue Apr  5 20:40:41 2011
 * 
 * @brief  Factory class that holds commands and arbitrary objects.
 * 
 * 
 */

#ifndef COMMAND_FACTORY_HPP_
#define COMMAND_FACTORY_HPP_

#include <iostream>
#include <map>
#include <string>

#include "base/object.hpp"
#include "base/proxy.hpp"

namespace VMG
{

class Object;

class Factory
{
public:
  typedef std::map<std::string, CommandProxyBase*>::iterator command_iterator;
  typedef std::map<std::string, Command*>::iterator instance_iterator;
  typedef std::map<std::string, Object*>::iterator object_iterator;

  Factory();
  virtual ~Factory();

  void Destroy();

  void RegisterCommand(CommandProxyBase* command); ///< Register a command
  void RegisterObject(Object* object);             ///< Register an object

  /**
   * Register an arbitrary object that is not derived from Object.
   * Similar functionality can be achieved by calling
   * "new ObjectStorage<T>(id, data);"
   */
  template <class T> void RegisterObjectStorage(std::string id, const T& data);
  template <class T> T& GetObjectStorageVal(std::string id);

  void DeleteCommand(std::string id);  ///< Delete a command
  void DeleteObject(std::string id);   ///< Delete an object

  Command* GetCommand(std::string id); ///< Returns a command.
  Object* GetObject(std::string id);   ///< Returns an object.

  /**
   * Checks for the correct number of arguments. This check is
   * automatically performed, whenever a command is executed from
   * a command list (if the library has not been compiled with NDEBUG).
   */
  bool CheckNumberOfArguments(std::string id, const int& num_arguments);

  void PrintAvailableCommands(); ///< Prints the name of all commands that have been registered to the factory.
  void PrintAvailableObjects();  ///< Prints the name of all objects that have been registered to the factory.

private:
  std::map<std::string, CommandProxyBase*> command_map;
  std::map<std::string, Command*> command_instance_map;
  std::map<std::string, Object*> object_map;
};

template <class T>
void Factory::RegisterObjectStorage(std::string id, const T& data)
{
  new ObjectStorage<T>(id, data);
}

template <class T>
T& Factory::GetObjectStorageVal(std::string id)
{
  return GetObject(id)->Cast< ObjectStorage<T> >()->Val();
}

}

#endif /* COMMAND_FACTORY_HPP_ */