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#ifndef COMMAND_H
#define COMMAND_H

#include <QObject>
#include <QPainter>
#include <QMap>
#include <QString>
#include <QStringList>
#include <QVariantList>
#include <QPainterPath>
#include <QTime>
#include <QImage>
#include <QPointF>
#include <QList>
#include <QTransform>
#include <QFileSystemWatcher>

class Command : public QObject
{
	Q_OBJECT

	enum ColorComponent
	{
		NoColorComponent,
		Red,
		Green,
		Blue,
		Hue,
		Saturation,
		Lightness
	};

	static Command * instance;
	Command();
	QPainter * painter;
	QPainterPath painterPath;
	QPainterPath  * highlightPath;

	bool coordAbsolute;

	QTime tDbg;

	QList<QTransform> transforms;

	QFileSystemWatcher imgWatcher;
	QMap<QString, QImage> imgCache;
	bool skipImages;

	QMap<QString, int> commands;
    QMap<QString, QString> alias;
	bool checkVars(const QVariantList& vars);

	QMap<QString, double> varMap;

	void highlightPre(QPointF& point);
	void highlightPost(QPointF& point);

public:
    static Command * getInstance();
	void clearAlias();
	void clearImageCache();
	void setPainter(QPainter * p){painter = p;}
	void setPP(QPainterPath& pp){painterPath = pp;}
	QPainterPath& PP(){return painterPath;}
    double number(QVariant v) const;

	void setHighlightPP(QPainterPath *pp){highlightPath = pp;}

	void Draw(const QVariantList& vars, bool higlight = false);
//	void GraphicState(const QVariantList& vars);

	const QMap<QString, QString>& getAliases() const{return alias;}
    QString getFromAlias(const QString& a) const;
	void setAlias(const QString& key, const QString& val);
    void setSkipImages(bool b){skipImages = b;}
    void insertVar(const QString& var, double value) {
        varMap.insert(var, value);
    }

	void clearTrans(){transforms.clear();}
	QList<QTransform> getTrans(){return transforms;}

	void clearVars() {varMap.clear();}

	void resetAbsolute(){coordAbsolute = true;}

	void endDraw();

public slots:
	void updateImgCache(const QString& fn);

signals:
	void namesChanged();
	void imageChanged();
	void changeSceneRect(double, double);
};

#endif // COMMAND_H