#ifndef FUNCTION_SEGMENT_VIEWER_H
#define FUNCTION_SEGMENT_VIEWER_H

#include <QLabel>
#include <QComboBox>

#include "tdoubleparam.h"
#include "toonzqt/lineedit.h"

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

class FunctionSegmentPage;
class FunctionSheet;
class TXsheetHandle;
class KeyframeSetter;
class FunctionPanel;
class QPushButton;
class QStackedWidget;
namespace DVGui
{
class MeasuredDoubleLineEdit;
class ExpressionField;
}

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

class FunctionSegmentViewer : public QFrame, public TParamObserver
{
	Q_OBJECT

	TDoubleParam *m_curve;
	int m_segmentIndex;
	int m_r0, m_r1;
	QWidget *m_topbar;

	QLineEdit *m_fromFld;
	QLineEdit *m_toFld;
	QLabel *m_paramNameLabel;

	QComboBox *m_typeCombo;
	DVGui::LineEdit *m_stepFld;
	QStackedWidget *m_parametersPanel;

	FunctionSegmentPage *m_pages[9];
	int m_typeId[9];

	FunctionSheet *m_sheet;
	TXsheetHandle *m_xshHandle;
	FunctionPanel *m_panel;

	// buttons for move segments
	QPushButton *m_prevCurveButton;
	QPushButton *m_nextCurveButton;
	QPushButton *m_prevLinkButton;
	QPushButton *m_nextLinkButton;

public:
	FunctionSegmentViewer(QWidget *parent, FunctionSheet *sheet = 0, FunctionPanel *panel = 0);
	~FunctionSegmentViewer();

	TDoubleParam *getCurve() const { return m_curve; }
	int getR0() const { return m_r0; }
	int getR1() const { return m_r1; }
	int getSegmentIndex() const { return m_segmentIndex; }

	void refresh();

	// overriden from TDoubleParamObserver
	void onChange(const TParamChange &) { refresh(); }

	void setXsheetHandle(TXsheetHandle *xshHandle) { m_xshHandle = xshHandle; }

	bool anyWidgetHasFocus();
	//in order to avoid FunctionViewer to get focus while editing the expression
	bool isExpressionPageActive();

private:
	int typeToIndex(int type) const;
	int indexToType(int typeIndex) const { return m_typeId[typeIndex]; }
	bool segmentIsValid() const;

	//for displaying the types of neighbor segments
	QString typeToString(int type) const;

private slots:
	void onSegmentTypeChanged(int type);
	void onCurveChanged();
	void onStepFieldChanged(const QString &);

	void onApplyButtonPressed();
	void onPrevCurveButtonPressed();
	void onNextCurveButtonPressed();
	void onPrevLinkButtonPressed();
	void onNextLinkButtonPressed();

public slots:
	void setSegment(TDoubleParam *curve, int segmentIndex);
	void setSegmentByFrame(TDoubleParam *curve, int frame);
};

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

class FunctionSegmentPage : public QWidget
{
	Q_OBJECT
	FunctionSegmentViewer *m_viewer;

public:
	FunctionSegmentPage(FunctionSegmentViewer *parent);
	~FunctionSegmentPage();

	FunctionSegmentViewer *getViewer() const { return m_viewer; }
	TDoubleParam *getCurve() const { return m_viewer->getCurve(); }

	int getR0() const { return m_viewer->getR0(); }
	int getR1() const { return m_viewer->getR1(); }

	virtual void refresh() = 0;
	virtual void apply() = 0;

	virtual void init(int segmentLength) = 0;

public slots:
	void onFieldChanged() { apply(); }
};

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

class SpeedInOutSegmentPage : public FunctionSegmentPage
{
	Q_OBJECT

	DVGui::LineEdit *m_speed0xFld;
	DVGui::MeasuredDoubleLineEdit *m_speed0yFld;
	DVGui::LineEdit *m_speed1xFld;
	DVGui::MeasuredDoubleLineEdit *m_speed1yFld;

	DVGui::MeasuredDoubleLineEdit *m_firstSpeedFld;
	DVGui::MeasuredDoubleLineEdit *m_lastSpeedFld;

public:
	SpeedInOutSegmentPage(FunctionSegmentViewer *parent = 0);
	void refresh();
	void apply(){};

	void getGuiValues(TPointD &speedIn, TPointD &speedOut);
	void init(int segmentLength);

public slots:
	void onFirstHandleXChanged();
	void onFirstHandleYChanged();
	void onLastHandleXChanged();
	void onLastHandleYChanged();
	void onFirstSpeedChanged();
	void onLastSpeedChanged();
};

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

class EaseInOutSegmentPage : public FunctionSegmentPage
{
	Q_OBJECT
	DVGui::MeasuredDoubleLineEdit *m_ease0Fld, *m_ease1Fld;
	double m_fieldScale;

	bool m_isPercentage;

public:
	EaseInOutSegmentPage(bool percentage, FunctionSegmentViewer *parent = 0);
	void refresh();
	void apply() {}

	void getGuiValues(TPointD &easeIn, TPointD &easeOut);
	void init(int segmentLength);

public slots:
	void onEase0Changed();
	void onEase1Changed();
};

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

class FunctionExpressionSegmentPage : public FunctionSegmentPage
{
	Q_OBJECT

	DVGui::ExpressionField *m_expressionFld;
	DVGui::LineEdit *m_unitFld;

public:
	FunctionExpressionSegmentPage(FunctionSegmentViewer *parent = 0);
	void refresh();
	void apply();

	// return false if a circular reference is occured
	bool getGuiValues(std::string &expressionText,
					  std::string &unitName);

	void init(int segmentLength);
};

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

class SimilarShapeSegmentPage : public FunctionSegmentPage
{
	Q_OBJECT

	DVGui::ExpressionField *m_expressionFld;
	DVGui::LineEdit *m_offsetFld;

public:
	SimilarShapeSegmentPage(FunctionSegmentViewer *parent = 0);

	void refresh();
	void apply();

	void init(int segmentLength);

	void getGuiValues(std::string &expressionText,
					  double &similarShapeOffset);
};

#endif