#ifndef TFX_INCLUDED
#define TFX_INCLUDED

#include <memory>

// TnzCore includes
#include "tsmartpointer.h"
#include "tpersist.h"
#include "texception.h"
#include "ttile.h"
#include "tgeometry.h"

// TnzBase includes
#include "tparamchange.h"

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

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

//    Forward declarations

class TFxImp;
class TFx;
class TParam;
class TFxAttributes;
class TParamContainer;
class TParamVar;
class TRenderSettings;
class TParamUIConcept;

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

class DVAPI TFxPort
{
	friend class TFx;

protected:
	TFx *m_owner;   //!< This is an input port of m_owner
	int m_groupIdx; //!< Dynamic group index this belongs to in m_owner (-1 if none)
	bool m_isControl;

public:
	TFxPort(bool isControl) : m_owner(0), m_groupIdx(-1), m_isControl(isControl) {}
	virtual ~TFxPort() {}

	virtual TFx *getFx() const = 0;
	virtual void setFx(TFx *) = 0;

	bool isConnected() const { return getFx() != 0; }
	bool isaControlPort() const { return m_isControl; }

	int getGroupIndex() const { return m_groupIdx; }

	TFx *getOwnerFx() const { return m_owner; }
	void setOwnerFx(TFx *fx) { m_owner = fx; }

private:
	// Not copiable
	TFxPort(const TFxPort &);
	TFxPort &operator=(const TFxPort &);
};

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

template <class T>
class TFxPortT : public TFxPort
{

	friend class TFx;

protected:
	T *m_fx;

public:
	TFxPortT(bool isControl = false) : TFxPort(isControl), m_fx(0) {}
	~TFxPortT()
	{
		if (m_fx) {
			m_fx->removeOutputConnection(this);
			m_fx->release();
		}
	}

	TFx *getFx() const { return m_fx; }

	void setFx(TFx *fx)
	{
		if (m_fx)
			m_fx->removeOutputConnection(this);

		if (fx == 0) {
			if (m_fx)
				m_fx->release();
			m_fx = 0;
		} else {
			T *fxt = dynamic_cast<T *>(fx);
			if (!fxt)
				throw TException("Fx: port type mismatch");

			fxt->addRef();
			if (m_fx)
				m_fx->release();

			m_fx = fxt;
			m_fx->addOutputConnection(this);
		}
	}

	T *operator->()
	{
		assert(m_fx);
		return m_fx;
	}
};

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

/*
  \brief A TFxPortDynamicGroup represents a group of fx ports with the
  same name prefix whose ports that are added or removed dynamically by
  Toonz on user request.

  \sa The TFx::dynamicPortsGroup() method.
*/
class DVAPI TFxPortDynamicGroup
{
public:
	typedef std::vector<TFxPort *> PortsContainer;

public:
	TFxPortDynamicGroup(const std::string &portsPrefix, int minPortsCount = 1);
	~TFxPortDynamicGroup();

	//! Returns the group's displayed ports prefix (ports added to the group \b must
	//! have this prefix).
	const std::string &portsPrefix() const { return m_portsPrefix; }

	//! Returns the minimal number of ports to be displayed in the group. The group
	//! <B> must not <\B> be initialized in an fx implementation with more ports than
	//! this number.
	int minPortsCount() const { return m_minPortsCount; }

	//! Returns the list of ports currently in the group (may contain empty ports).
	const PortsContainer &ports() const { return m_ports; }

	//! Equivalent to checking the portName prefix against the stored one.
	bool contains(const std::string &portName) const
	{
		return (strncmp(m_portsPrefix.c_str(), portName.c_str(), m_portsPrefix.size()) == 0);
	}

private:
	std::string m_portsPrefix; //!< Name prefix of each stored port
	int m_minPortsCount;	   //!< Ports count \a should not be smaller

	std::vector<TFxPort *> m_ports; //!< \b Owned ports (deleted on destruction)

private:
	friend class TFx;

	// Not copyable
	TFxPortDynamicGroup(const TFxPortDynamicGroup &);
	TFxPortDynamicGroup &operator=(const TFxPortDynamicGroup &);

	void addPort(TFxPort *port);
	void removePort(TFxPort *port); //!< Removes <I> and deletes <\I> the specified port
	void clear();
};

typedef TFxPortDynamicGroup TFxPortDG;

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

class DVAPI TFxTimeRegion
{
public:
	TFxTimeRegion();
	TFxTimeRegion(double start, double end);

	static TFxTimeRegion createUnlimited();

	TFxTimeRegion &operator+=(const TFxTimeRegion &rhs)
	{
		m_start = tmin(m_start, rhs.m_start);
		m_end = tmax(m_end, rhs.m_end);
		return *this;
	}

	TFxTimeRegion &operator+=(double shift)
	{
		m_start += shift;
		m_end += shift;
		return *this;
	}

	TFxTimeRegion &operator-=(double shift)
	{
		return operator+=(-shift);
	}

	bool contains(double time) const;
	bool isUnlimited() const;
	bool isEmpty() const;

	bool getFrameCount(int &count) const;
	int getFirstFrame() const;
	int getLastFrame() const;

	double m_start;
	double m_end;
};

inline DVAPI TFxTimeRegion operator+(const TFxTimeRegion &tr1, const TFxTimeRegion &tr2)
{
	return TFxTimeRegion(tr1) += tr2;
}

inline DVAPI TFxTimeRegion operator+(const TFxTimeRegion &tr1, double shift)
{
	return TFxTimeRegion(tr1) += shift;
}

inline DVAPI TFxTimeRegion operator-(const TFxTimeRegion &tr1, double shift)
{
	return TFxTimeRegion(tr1) -= shift;
}

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

class DVAPI TFxChange
{
public:
	TFx *m_fx;

	double m_firstAffectedFrame;
	double m_lastAffectedFrame;
	bool m_dragging;

	static double m_minFrame;
	static double m_maxFrame;

public:
	TFxChange(TFx *fx, double firstAffectedFrame, double lastAffectedFrame, bool dragging)
		: m_fx(fx), m_firstAffectedFrame(firstAffectedFrame), m_lastAffectedFrame(lastAffectedFrame), m_dragging(dragging) {}

private:
	TFxChange();
};

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

class TFxParamChange : public TFxChange
{
public:
	TFxParamChange(TFx *fx, double firstAffectedFrame, double lastAffectedFrame, bool dragging);
	TFxParamChange(TFx *fx, const TParamChange &src);
};

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

class TFxPortAdded : public TFxChange
{
public:
	TFxPortAdded(TFx *fx) : TFxChange(fx, m_minFrame, m_maxFrame, false) {}
	~TFxPortAdded() {}
};

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

class TFxPortRemoved : public TFxChange
{
public:
	TFxPortRemoved(TFx *fx) : TFxChange(fx, m_minFrame, m_maxFrame, false) {}
	~TFxPortRemoved() {}
};

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

class TFxParamAdded : public TFxChange
{
public:
	TFxParamAdded(TFx *fx) : TFxChange(fx, m_minFrame, m_maxFrame, false) {}
	~TFxParamAdded() {}
};

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

class TFxParamRemoved : public TFxChange
{
public:
	TFxParamRemoved(TFx *fx) : TFxChange(fx, m_minFrame, m_maxFrame, false) {}
	~TFxParamRemoved() {}
};

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

class TFxParamsUnlinked : public TFxChange
{
public:
	TFxParamsUnlinked(TFx *fx) : TFxChange(fx, m_minFrame, m_maxFrame, false) {}
	~TFxParamsUnlinked() {}
};

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

class DVAPI TFxObserver
{
public:
	TFxObserver() {}
	virtual ~TFxObserver() {}

	virtual void onChange(const TFxChange &change) = 0;

	virtual void onChange(const TFxPortAdded &change)
	{
		onChange(static_cast<const TFxChange &>(change));
	}

	virtual void onChange(const TFxPortRemoved &change)
	{
		onChange(static_cast<const TFxChange &>(change));
	}

	virtual void onChange(const TFxParamAdded &change)
	{
		onChange(static_cast<const TFxChange &>(change));
	}

	virtual void onChange(const TFxParamRemoved &change)
	{
		onChange(static_cast<const TFxChange &>(change));
	}

	virtual void onChange(const TFxParamsUnlinked &change)
	{
		onChange(static_cast<const TFxChange &>(change));
	}
};

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

class TFxInfo
{
public:
	std::string m_name;
	bool m_isHidden;

public:
	TFxInfo() {}
	TFxInfo(const std::string &name, bool isHidden)
		: m_name(name), m_isHidden(isHidden) {}
};

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

#ifdef _WIN32
template class DVAPI TSmartPointerT<TFx>;
#endif
typedef TSmartPointerT<TFx> TFxP;

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

class DVAPI TFx : public TSmartObject, public TPersist, public TParamObserver
{
	DECLARE_CLASS_CODE

	TFxImp *m_imp;

public:
	typedef TFx *CreateProc();

	TFx();
	virtual ~TFx();

	virtual std::wstring getName() const;
	void setName(std::wstring name);
	std::wstring getFxId() const;
	void setFxId(std::wstring id);

	TParamContainer *getParams();
	const TParamContainer *getParams() const;
	void addParamVar(TParamVar *var);

	virtual TFx *clone(bool recursive = true) const;
	TFx *clone(TFx *fx, bool recursive) const;

	void unlinkParams();
	void linkParams(TFx *src);

	TFx *getLinkedFx() const;

	bool addInputPort(const std::string &name, TFxPort &p); //!< Adds a port with given name, returns false on duplicate names.
															//!  Ownership of the port belongs to derived implementations of TFx.
	bool addInputPort(const std::string &name, TFxPort *p,
					  int groupIndex);			   //!< Adds a port with given name to the specified dynamic group,
												   //!  returns false on duplicate names. Ownership is transferred to the group.
	bool removeInputPort(const std::string &name); //!< Removes the port with given name, returns false if not found.

	bool renamePort(const std::string &oldName, const std::string &newName);

	bool connect(const std::string &name, TFx *other); //!< Equivalent to getInputPort(name)->setFx(other).
	bool disconnect(const std::string &name);		   //!< Equivalent to getInputPort(name)->setFx(0).

	int getInputPortCount() const;
	TFxPort *getInputPort(int index) const;
	TFxPort *getInputPort(const std::string &name) const;
	std::string getInputPortName(int index) const;

	virtual int dynamicPortGroupsCount() const { return 0; }
	virtual const TFxPortDG *dynamicPortGroup(int g) const { return 0; }
	bool hasDynamicPortGroups() const { return (dynamicPortGroupsCount() > 0); }
	void clearDynamicPortGroup(int g); //!< \warning Users must ensure that the group's minimal
									   //!  ports count is respected - this method does \b not.
	bool addOutputConnection(TFxPort *port);
	bool removeOutputConnection(TFxPort *port);

	static void listFxs(std::vector<TFxInfo> &fxInfos);
	static TFxInfo getFxInfo(const std::string &fxIdentifier); //!< Returns info associated to an fx identifier, or an
															   //!  unnamed one if none was found.
	virtual bool isZerary() const { return getInputPortCount() == 0; }

	// returns the column index that provides reference frame for the FX.
	// (TColumnFx and Zerary fxs return their column indexes, n-ary FXs return
	// the reference column index of their first argument)
	// note: it returns -1 if the column is undefined (e.g. a n-ary FX with arguments undefined yet)
	virtual int getReferenceColumnIndex() const;

	// se getXsheetPort() != 0 e la porta non e' connessa la si considera connessa
	// a tutte le colonne precedenti a quella corrente.
	// cfr. AddFx
	virtual TFxPort *getXsheetPort() const { return 0; }

	int getOutputConnectionCount() const;
	TFxPort *getOutputConnection(int i) const;

	virtual TFxTimeRegion getTimeRegion() const;

	void setActiveTimeRegion(const TFxTimeRegion &tr);
	TFxTimeRegion getActiveTimeRegion() const;

	virtual bool checkActiveTimeRegion() const { return true; }

	void disconnectAll();

	//! Returns a list of User Interface Concepts to be displayed when editing the fx parameters.
	//! \note Ownership of the returned array allocated with new[] is passed to callers.
	virtual void getParamUIs(TParamUIConcept *&params, int &length)
	{
		params = 0, length = 0;
	}

	inline std::string getFxType() const;
	virtual std::string getPluginId() const = 0;

	static TFx *create(std::string name);

	// TParamObserver-related methods
	void onChange(const TParamChange &c);

	void addObserver(TFxObserver *);
	void removeObserver(TFxObserver *);
	void notify(const TFxChange &change);
	void notify(const TFxPortAdded &change);
	void notify(const TFxPortRemoved &change);
	void notify(const TFxParamAdded &change);
	void notify(const TFxParamRemoved &change);

	void loadData(TIStream &is);
	void saveData(TOStream &os);

	void loadPreset(TIStream &is); // solleva un eccezione se il preset non corrisponde all'effetto
	void savePreset(TOStream &os);

	TFxAttributes *getAttributes() const;

	virtual std::string getAlias(double frame, const TRenderSettings &info) const { return ""; }

	//! Compatibility function - used to translate a port name from older Toonz
	//! versions into its current form.
	virtual void compatibilityTranslatePort(int majorVersion, int minorVersion, std::string &portName) {}

	/*-- Rendering（目玉）ボタンがOFFのときに使用されるInputPort --*/
	virtual int getPreferredInputPort() { return 0; }

	/* RasterFxPluginHost 用の仮想関数 */
	virtual void callStartRenderHandler() {}
	virtual void callEndRenderHandler() {}
	virtual void callStartRenderFrameHandler(const TRenderSettings *rs, double frame) {}
	virtual void callEndRenderFrameHandler(const TRenderSettings *rs, double frame) {}

public:
	// Id-related functions

	unsigned long getIdentifier() const;
	void setIdentifier(unsigned long id);
	void setNewIdentifier();

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

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

DVAPI TIStream &operator>>(TIStream &in, TFxP &p);

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

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

class DVAPI TFxDeclaration : public TPersistDeclaration
{
public:
	TFxDeclaration(const TFxInfo &info);
};

template <class T>
class TFxDeclarationT : public TFxDeclaration
{
public:
	TFxDeclarationT(const TFxInfo &info) : TFxDeclaration(info) {}
	TPersist *create() const { return new T; }
};

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

inline std::string TFx::getFxType() const
{
	return getDeclaration()->getId();
}

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

#define FX_DECLARATION(T) \
public:                   \
	const TPersistDeclaration *getDeclaration() const;

#define FX_IDENTIFIER(T, I)                        \
	namespace                                      \
	{                                              \
	TFxDeclarationT<T> info##T(TFxInfo(I, false)); \
	}                                              \
	const TPersistDeclaration *T::getDeclaration() const { return &info##T; }

#define FX_IDENTIFIER_IS_HIDDEN(T, I)             \
	namespace                                     \
	{                                             \
	TFxDeclarationT<T> info##T(TFxInfo(I, true)); \
	}                                             \
	const TPersistDeclaration *T::getDeclaration() const { return &info##T; }

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

#endif