/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org)    *
 *                                                                            *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#ifndef DYNAMICOBJECT_H
#define DYNAMICOBJECT_H

#include "base/i2-base.hpp"
#include "base/configobject.thpp"
#include "base/object.hpp"
#include "base/type.hpp"
#include "base/dictionary.hpp"
#include <boost/signals2.hpp>

namespace icinga
{

class ConfigType;

/**
 * A dynamic object that can be instantiated from the configuration file.
 *
 * @ingroup base
 */
class I2_BASE_API ConfigObject : public ObjectImpl<ConfigObject>
{
public:
	DECLARE_OBJECT(ConfigObject);

	static boost::signals2::signal<void (const ConfigObject::Ptr&)> OnStateChanged;

	intrusive_ptr<ConfigType> GetType(void) const;

	bool IsActive(void) const;
	bool IsPaused(void) const;

	void SetExtension(const String& key, const Value& value);
	Value GetExtension(const String& key);
	void ClearExtension(const String& key);

	void ModifyAttribute(const String& attr, const Value& value, bool updateVersion = true);
	void RestoreAttribute(const String& attr);
	bool IsAttributeModified(const String& attr) const;

	void Register(void);
	void Unregister(void);

	void Activate(void);
	void Deactivate(void);
	void SetAuthority(bool authority);

	virtual void Start(void) override;
	virtual void Stop(void) override;

	virtual void Pause(void);
	virtual void Resume(void);

	virtual void OnConfigLoaded(void);
	virtual void CreateChildObjects(const Type::Ptr& childType);
	virtual void OnAllConfigLoaded(void);
	virtual void OnStateLoaded(void);

	template<typename T>
	static intrusive_ptr<T> GetObject(const String& name)
	{
		ConfigObject::Ptr object = GetObject(T::GetTypeName(), name);

		return static_pointer_cast<T>(object);
	}

	static ConfigObject::Ptr GetObject(const String& type, const String& name);

	static void DumpObjects(const String& filename, int attributeTypes = FAState);
	static void RestoreObjects(const String& filename, int attributeTypes = FAState);
	static void StopObjects(void);

	static void DumpModifiedAttributes(const boost::function<void(const ConfigObject::Ptr&, const String&, const Value&)>& callback);

	static Object::Ptr GetPrototype(void);

protected:
	explicit ConfigObject(void);

private:
	static void RestoreObject(const String& message, int attributeTypes);
};

#define DECLARE_OBJECTNAME(klass)						\
	inline static String GetTypeName(void)					\
	{									\
		return #klass;							\
	}									\
										\
	inline static intrusive_ptr<klass> GetByName(const String& name)	\
	{									\
		return ConfigObject::GetObject<klass>(name);			\
	}

}

#endif /* DYNAMICOBJECT_H */