#ifndef T_PARAM_INCLUDED
#define T_PARAM_INCLUDED

#include "tpersist.h"
#include "tsmartpointer.h"
#include <set>

#undef DVAPI
#undef DVVAR
#ifdef TPARAM_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

class TParamObserver;

//=========================================================
//! This class is an abstract class and is a generic interface to the features of an object.
/*!
	It is used to access to the parameters of an object, with the purpose  
	to store and retrieve the key features.
*/
class DVAPI TParam : public TSmartObject, public TPersist
{

	DECLARE_CLASS_CODE
	std::string m_name;
	std::string m_description;
	std::string m_label;

public:
	/*!
		The contructor store the name of the parameter and initialize his 
		interface with I/O through the class TPersist.
	*/
	TParam(std::string name = "", std::string description = "", std::string label = "")
		: TSmartObject(m_classCode), TPersist(), m_name(name), m_description(description),
		  m_label(label) {}

	virtual ~TParam() {}
	/*!
		Returns the name of the parameter.
	*/
	std::string getName() const { return m_name; };
	/*!
		This method sets the name of the parameter to \e name.
	*/
	void setName(const std::string &name) { m_name = name; };

	/*!
		Return the description.
	*/
	std::string getDescription() const { return m_description; }
	/*!
		Set the description.
	*/
	void setDescription(const std::string &description) { m_description = description; }

	bool hasUILabel() const { return m_label != "" ? true : false; }
	void setUILabel(const std::string &l) { m_label = l; };
	std::string getUILabel() const { return m_label; };

	/*!
		This method must be implemented with a clone function, i.e a function that make 
		a new copy of the parameter. 
	*/
	virtual TParam *clone() const = 0;
	/*!
		Performs a copy function of the parameter in an existing object.
	*/
	virtual void copy(TParam *src) = 0;
	/*!
		An observer is a generic class that takes care and manages of canghes in the parameters.
		This method must be implemented with a function that add objects to an observer internal list.   
	*/
	virtual void addObserver(TParamObserver *) = 0;
	/*!
		Removes \e this from the observer. 
		\sa addObserver()
	*/
	virtual void removeObserver(TParamObserver *) = 0;
	/*!
		This method is used to sets the status changing notification of the parameter. i.e the 
		observer must take care of the changes. 
     */
	virtual void enableNotification(bool on) {}
	/*!
		This method must return \e true if the  notification status is enabled.
	*/
	virtual bool isNotificationEnabled() const { return true; }

	/*!
		This pure virtual method must return a string with the value of the parameter 
		and the precision needed.
	*/
	virtual std::string getValueAlias(double frame, int precision) = 0;

	virtual bool isAnimatable() const = 0;
	/*!
		It must returns \e true if the \e frame is a keyframe.
	*/
	virtual bool isKeyframe(double frame) const = 0;
	/*!
		Removes \e frame from the list of the keyframes associated to this parameter.	
	*/
	virtual void deleteKeyframe(double frame) = 0;
	/*!
		Removes all keyframes from this parameter.
	*/
	virtual void clearKeyframes() = 0;
	/*!
		Makes the \e frame associated to this parameter a keyframe
	*/
	virtual void assignKeyframe(
		double frame,
		const TSmartPointerT<TParam> &src, double srcFrame,
		bool changedOnly = false) = 0;
	/*!
		This function must be overridden with a method that returns as a reference 
		a list of keyframes in the form of a standard list.  
	*/
	virtual void getKeyframes(std::set<double> &frames) const {}
	/*!
		This method must return true if there are keyframes associated to this parameter.
	*/
	virtual bool hasKeyframes() const { return false; }
	/*!
		This method must return the index of the keyframe (if any) after the \e frame, otherwiswe 
		returns -1.
	*/
	virtual int getNextKeyframe(double frame) const { return -1; }
	/*!
		This method must return the index of the keyframe (if any) before the \e frame, otherwiswe 
		returns -1.
	*/
	virtual int getPrevKeyframe(double frame) const { return -1; }
	/*!
		This method must returns a frame given the index \e index. A frame is a double value representing 
		a frame.
	*/
	virtual double keyframeIndexToFrame(int index) const { return 0.0; }

private:
	// not implemented
	TParam(const TParam &);
	TParam &operator=(const TParam &);
};

//---------------------------------------------------------

#ifdef _WIN32
template class DVAPI TSmartPointerT<TParam>;
#endif
typedef TSmartPointerT<TParam> TParamP;

//=========================================================

#ifdef _WIN32
#define DVAPI_PARAM_SMARTPOINTER(PARAM)         \
	template class DVAPI TSmartPointerT<PARAM>; \
	template class DVAPI TDerivedSmartPointerT<PARAM, TParam>;
#else
#define DVAPI_PARAM_SMARTPOINTER(PARAM)
#endif

#define DEFINE_PARAM_SMARTPOINTER(PARAM, TYPE)                         \
	DVAPI_PARAM_SMARTPOINTER(PARAM)                                    \
                                                                       \
	class DVAPI PARAM##P : public TDerivedSmartPointerT<PARAM, TParam> \
	{                                                                  \
	public:                                                            \
		PARAM##P(PARAM *p = 0) : DerivedSmartPointer(p) {}             \
		PARAM##P(TYPE v) : DerivedSmartPointer(new PARAM(v)) {}        \
		PARAM##P(TParamP &p) : DerivedSmartPointer(p) {}               \
		PARAM##P(const TParamP &p) : DerivedSmartPointer(p) {}         \
		operator TParamP() const { return TParamP(m_pointer); }        \
	};

#endif