/*  LabelEditor.h
 *
 *  Copyright (C) 2013-2016  Jim Evins <evins@snaught.com>
 *
 *  This file is part of gLabels-qt.
 *
 *  gLabels-qt 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LabelEditor_h
#define LabelEditor_h

#include <QWidget>
#include <QScrollArea>
#include <QPainter>

#include "LabelRegion.h"


// Forward References
class LabelModel;
class LabelModelObject;
class UndoRedoModel;
class Handle;


///
/// LabelEditor Widget
///
class LabelEditor : public QWidget
{
	Q_OBJECT

	/////////////////////////////////////
	// Lifecycle
	/////////////////////////////////////
public:
	LabelEditor( QScrollArea* scrollArea, QWidget* parent = 0 );


	/////////////////////////////////////
	// Signals
	/////////////////////////////////////
signals:
	void contextMenuActivate();
	void zoomChanged();
	void pointerMoved( const glabels::Distance& x, const glabels::Distance& y );
	void pointerExited();
	void modeChanged();


	/////////////////////////////////////
	// Parameters
	/////////////////////////////////////
public:
	double zoom() const;
	bool markupVisible() const;
	bool qridVisible() const;


	/////////////////////////////////////
	// Model
	/////////////////////////////////////
public:
	void setModel( LabelModel* model, UndoRedoModel* undoRedoModel );


	/////////////////////////////////////
	// Visibility operations
	/////////////////////////////////////
public:
	void setGridVisible( bool visibleFlag );
	void setMarkupVisible( bool visibleFlag );


	/////////////////////////////////////
	// Zoom operations
	/////////////////////////////////////
public:
	void zoomIn();
	void zoomOut();
	void zoom1To1();
	void zoomToFit();
	bool isZoomMax() const;
	bool isZoomMin() const;
private:
	void setZoomReal( double zoom, bool zoomToFitFlag );


	/////////////////////////////////////
	// Mode operations
	/////////////////////////////////////
public:
	void arrowMode();
	void createBoxMode();
	void createEllipseMode();
	void createLineMode();
	void createImageMode();
	void createTextMode();
	void createBarcodeMode();


	/////////////////////////////////////
	// Event handlers
	/////////////////////////////////////
protected:
	void resizeEvent( QResizeEvent* event );
	void mousePressEvent( QMouseEvent* event );
	void mouseMoveEvent( QMouseEvent* event );
	void mouseReleaseEvent( QMouseEvent* event );
	void leaveEvent( QEvent* event );
	void keyPressEvent( QKeyEvent* event );
	void paintEvent( QPaintEvent* event );


	/////////////////////////////////////
	// Private methods
	/////////////////////////////////////
private:
	void handleResizeMotion( const glabels::Distance& xWorld,
	                         const glabels::Distance& yWorld );

	void drawBgLayer( QPainter* painter );
	void drawGridLayer( QPainter* painter );
	void drawMarkupLayer( QPainter* painter );
	void drawObjectsLayer( QPainter* painter );
	void drawFgLayer( QPainter* painter );
	void drawHighlightLayer( QPainter* painter );
	void drawSelectRegionLayer( QPainter* painter );


	/////////////////////////////////////
	// Private slots
	/////////////////////////////////////
private slots:
	void onSettingsChanged();
	void onModelSizeChanged();


	/////////////////////////////////////
	// Private data
	/////////////////////////////////////
private:
	enum State {
		IdleState,
		ArrowSelectRegion,
		ArrowMove,
		ArrowResize,
		CreateIdle,
		CreateDrag
	};

	enum CreateType {
		Box,
		Ellipse,
		Line,
		Image,
		Text,
		Barcode
	};

	QScrollArea*         mScrollArea;

	double               mZoom;
	bool                 mZoomToFitFlag;
	double               mScale;
	glabels::Distance    mX0;
	glabels::Distance    mY0;

	bool                 mMarkupVisible;
	bool                 mGridVisible;

	double               mGridSpacing;
	glabels::Distance    mStepSize;

	LabelModel*          mModel;
	UndoRedoModel*       mUndoRedoModel;

	State                mState;

	/* ArrowSelectRegion state */
	bool                 mSelectRegionVisible;
	LabelRegion          mSelectRegion;

	/* ArrowMove state */
	glabels::Distance    mMoveLastX;
	glabels::Distance    mMoveLastY;

	/* ArrowResize state */
	LabelModelObject*    mResizeObject;
	Handle*              mResizeHandle;
	bool                 mResizeHonorAspect;

	/* CreateDrag state */
	CreateType           mCreateObjectType;
	LabelModelObject*    mCreateObject;
	glabels::Distance    mCreateX0;
	glabels::Distance    mCreateY0;


};


#endif // LabelEditor_h