#ifndef TAPP_H
#define TAPP_H

#include <QObject>

#include "tools/tool.h"

// forward declaration
class TSceneHandle;
class TXsheetHandle;
class TXshLevelHandle;
class TFrameHandle;
class TColumnHandle;
class ToolHandle;
class TObjectHandle;
class TSelectionHandle;
class TOnionSkinMaskHandle;
class TFxHandle;
class PaletteController;
class QTimer;
class TXshLevel;
class QMainWindow;

class TMainWindow;
class ComboViewerPanel;

//=============================================================================
// TXsheeHandle
//-----------------------------------------------------------------------------
//! This is the instance of the main application.

/*! This class is a singleton and is used to initialize the main application window.
		It defines the basic signals used in the application, as the status changing of 
		the scene and connects them to the basic handlers.
	\n	It is also used to retrieve a pointer to the current state of the application,
		as the pointer to the main window, a pointer to the current scene or a pointer
		to the current selection, etc...
	\n	For example to get the pointer to the main window in any part of the code one has to write:

	\code
// A pointer to the main windows is

QMainWindow * mainwindow = TApp::instance()->getMainWindow();

// To get the current object id

TStageObjectId currentObjectId = TApp::instance()->getCurrentObject()->getObjectId();

		\endcode
		This class is used to take care of changes on the state of the application and to 
		notify through event handling to the rest of the code.
	*/
class TApp : public QObject, public TTool::Application //Singleton
{
	Q_OBJECT

	TSceneHandle *m_currentScene;
	TXsheetHandle *m_currentXsheet;
	TFrameHandle *m_currentFrame;
	TColumnHandle *m_currentColumn;
	TXshLevelHandle *m_currentLevel;
	ToolHandle *m_currentTool;
	TObjectHandle *m_currentObject;
	TSelectionHandle *m_currentSelection;
	TOnionSkinMaskHandle *m_currentOnionSkinMask;
	TFxHandle *m_currentFx;

	PaletteController *m_paletteController;

	QMainWindow *m_mainWindow;

	//keep a pointer of the inknpaint viewer in order to enable navigator pan in the filmstrip
	ComboViewerPanel *m_inknPaintViewerPanel;

	int m_autosavePeriod; // minutes
	bool m_autosaveSuspended;
	QTimer *m_autosaveTimer;

	TApp();

	bool m_isStarting;
	bool m_isPenCloseToTablet;

public:
	/*!
		A static pointer to the main application.
	*/
	static TApp *instance();

	~TApp();
	/*!
		Returns a pointer to the current scene.
	*/
	TSceneHandle *getCurrentScene() const { return m_currentScene; }
	/*!
		Returns a pointer to the current Xsheet.
	*/
	TXsheetHandle *getCurrentXsheet() const { return m_currentXsheet; }
	/*!
		Returns a pointer to the current frame.
	*/
	TFrameHandle *getCurrentFrame() const { return m_currentFrame; }
	/*!
		Returns a pointer to the current column.
	*/
	TColumnHandle *getCurrentColumn() const { return m_currentColumn; }
	/*!
		Returns a pointer to the current level.
	*/
	TXshLevelHandle *getCurrentLevel() const { return m_currentLevel; }
	/*!
		Returns a pointer to the current tool used.
	*/
	ToolHandle *getCurrentTool() const { return m_currentTool; }
	/*!
		Returns a pointer to the current object in use.
	*/
	TObjectHandle *getCurrentObject() const { return m_currentObject; }
	/*!
		Returns a pointer to the current selection.
	*/
	TSelectionHandle *getCurrentSelection() const { return m_currentSelection; }
	/*!
		Returns a pointer to the current layer's mask.
	*/
	TOnionSkinMaskHandle *
	getCurrentOnionSkin() const { return m_currentOnionSkinMask; }
	/*!
		Returns a pointer to the current effect.
	*/
	TFxHandle *getCurrentFx() const { return m_currentFx; }

	PaletteController *getPaletteController() const { return m_paletteController; }
	/*!
		Sets a pointer to the main window..
	*/

	// Current Palette (PaletteController) methods

	TPaletteHandle *getCurrentPalette() const;

	TColorStyle *getCurrentLevelStyle() const;

	int getCurrentLevelStyleIndex() const;

	void setCurrentLevelStyleIndex(int index);

	void setMainWindow(QMainWindow *mainWindow) { m_mainWindow = mainWindow; }
	/*!
		Returns a pointer to the main window.
	*/
	QMainWindow *getMainWindow() const { return m_mainWindow; }
	/*!
		Returns a pointer to the current room. The current room is the window environment in use, 
		i.e. the drawing tab, the animation tab, the pltedit tab etc...
	*/
	TMainWindow *getCurrentRoom() const;
	/*!
		Returns the current image type that can be a raster or a vector image. \sa TImage::Type.
	*/
	int getCurrentImageType();
	/*!
		Initializes the main window application. It is called in the main function 
		after the environment initialization.
	*/
	void init();

	QString getCurrentRoomName() const;

	//keep a pointer of the inknpaint viewer in order to enable navigator pan in the filmstrip
	void setInknPaintViewerPanel(ComboViewerPanel *panel) { m_inknPaintViewerPanel = panel; }
	ComboViewerPanel *getInknPaintViewerPanel() const { return m_inknPaintViewerPanel; }

	bool isApplicationStarting() { return m_isStarting; }

	bool isPenCloseToTablet() const { return m_isPenCloseToTablet; }

protected:
	bool eventFilter(QObject *obj, QEvent *event);

private:
	void updateXshLevel();
	void updateCurrentFrame();

protected slots:
	void onXsheetChanged();
	void onSceneSwitched();
	void onXsheetSwitched();
	void onXsheetSoundChanged();
	void onFrameSwitched();
	void onFxSwitched();
	void onColumnIndexSwitched();
	void onXshLevelSwitched(TXshLevel *);
	void onXshLevelChanged();
	void onObjectSwitched();
	void onSplineChanged();
	void onSceneChanged();

	void onImageChanged();

	void onPaletteChanged();
	void onLevelColorStyleChanged();
	void onLevelColorStyleSwitched();

	void autosave();
	void onToolEditingFinished();
	void onStartAutoSave();
	void onStopAutoSave();
};

#endif //TAPP_H