#ifndef TSCANNER_H
#define TSCANNER_H

#include "trasterimage.h"
#include <set>
#include <QString>
#undef DVAPI
#undef DVVAR
#ifdef TNZBASE_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

// forward declaration
class TOStream;
class TIStream;
class TFilePath;

struct DVAPI TScanParam {
	TScanParam()
		: m_supported(false), m_min(0), m_max(0), m_def(0), m_step(0), m_value(0)
	{
	}

	TScanParam(float _min, float _max, float _def, float _step)
		: m_supported(true), m_min(_min), m_max(_max), m_def(_def), m_step(1), m_value(_def)
	{
	}

	bool m_supported;
	float m_min, m_max, m_def, m_step, m_value; // questi sono float per seguire lo standard TWAIN !

	void update(const TScanParam &model);
	// assegna min,max,def,step e supported da model a this
	// mantiene value a patto che sia contenuto nel nuovo range, diversamente ne fa il crop
};

class DVAPI TScannerParameters
{
public:
	enum ScanType {
		None,
		BW,
		GR8,
		RGB24
	};

private:
	// Supported scan types: Black and white, graytones, color
	bool m_bw, m_gray, m_rgb;

	// Current scan type
	ScanType m_scanType;

	std::string m_paperFormat; // e.g. "A4 paper"
	TRectD m_scanArea;	// in mm /* TWAIN preferirebbe gli inch, ma uso i mm per seguire tnz4.x*/
	TRectD m_cropBox;	 // in mm /* TWAIN preferirebbe gli inch, ma uso i mm per seguire tnz4.x*/
	bool m_isPreview;
	TDimensionD m_maxPaperSize; // in mm /* TWAIN preferirebbe gli inch, ma uso i mm per seguire tnz4.x*/

	bool m_paperOverflow; // vale true se la scanArea e' stata tagliata rispetto alle dimensioni della carta
						  // per rispettare la maxPaperSize

	bool m_validatedByCurrentScanner;
	// vale false se bisogna ancora chiamare adaptToCurrentScanner()
	// l'idea e' di chiamare questo metodo il meno possibile

public:
	TScanParam m_brightness;
	TScanParam m_contrast;
	TScanParam m_threshold;
	TScanParam m_dpi;
	TScanParam m_paperFeeder; // value==1.0 => use paper feeder

private:
	// other useful info ?!
	std::string m_twainVersion;
	std::string m_manufacturer;
	std::string m_prodFamily;
	std::string m_productName;
	std::string m_version;

	bool m_reverseOrder; // if true then scan levels starting from last frame

	void cropScanArea(); // assicura che scanArea sia dentro maxPaperSize

public:
	TScannerParameters();
	~TScannerParameters();

	void setSupportedTypes(bool bw, bool gray, bool rgb);
	bool isSupported(ScanType) const;

	void setMaxPaperSize(double maxWidth, double maxHeight); // note: possibly update m_scanArea

	std::string getPaperFormat() const { return m_paperFormat; }
	void setPaperFormat(std::string paperFormat);
	// assert(TPaperFormatManager::instance()->isValidFormat(paperFormat));
	// updates scanArea (cropping with maxPaperSize)

	void updatePaperFormat();
	// if paperFormat=="" set default paper format; recompute (to be sure!) scanArea

	bool getPaperOverflow() const { return m_paperOverflow; } // true iff paperSize > maxPaperSize

	TRectD getScanArea() const { return m_scanArea; }
	void setCropBox(const TRectD &cropBox) { m_cropBox = cropBox * m_scanArea; }
	TRectD getCropBox() const { return m_cropBox; }
	void setIsPreview(bool isPreview) { m_isPreview = isPreview; };
	bool isPreview() const { return m_isPreview; }

	bool isReverseOrder() const { return m_reverseOrder; }
	void setReverseOrder(bool reverseOrder) { m_reverseOrder = reverseOrder; }

	bool isPaperFeederEnabled() const { return m_paperFeeder.m_value == 1.0; }
	void enablePaperFeeder(bool on) { m_paperFeeder.m_value = on ? 1.0f : 0.0f; }

	void setScanType(ScanType scanType);
	ScanType getScanType() const { return m_scanType; }

	// se e' stato definito uno scanner aggiorna lo stato (enabled/disabled, range, etc.)
	// dei parametri rispetto a quest'ultimo
	void adaptToCurrentScanner();
	void adaptToCurrentScannerIfNeeded()
	{
		if (!m_validatedByCurrentScanner)
			adaptToCurrentScanner();
	}

	void assign(const TScannerParameters *params);
	void saveData(TOStream &os) const;
	void loadData(TIStream &is);
};

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

class TScannerListener
{
public:
	virtual void onImage(const TRasterImageP &) = 0;
	virtual void onError() = 0;
	virtual void onNextPaper() = 0;
	virtual void onAutomaticallyNextPaper() = 0;
	virtual bool isCanceled() = 0;
	virtual ~TScannerListener() {}
};

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

class DVAPI TScanner
{

	std::set<TScannerListener *> m_listeners;

protected:
	TScanParam m_brightness, m_contrast, m_threshold, m_dpi;
	int m_paperLeft;
	QString m_scannerName;

public:
	TScanner();
	virtual ~TScanner();

	static bool m_isTwain; //brutto, brutto :(
	static TScanner *instance();

	virtual void selectDevice() = 0;
	virtual bool isDeviceAvailable() = 0;
	virtual bool isDeviceSelected() { return false; }

	virtual void updateParameters(TScannerParameters &parameters) = 0;
	// aggiorna i parametri 'parameters' in funzione del tipo di scanner selezionato
	// se possibile non modifica i valori correnti, ma cambia solo quello che non e' piu' adatto
	// abilita/disabilita i parametri "opzionali".
	// n.b. i parametri opzionali che vengono disabilitati mantengono il loro valore
	// (cosi' se fai save default settings dopo aver cambiato scanner non ti perdi i vecchi settaggi)

	virtual void acquire(const TScannerParameters &param, int paperCount) = 0;

	void addListener(TScannerListener *);
	void removeListener(TScannerListener *);

	void notifyImageDone(const TRasterImageP &image);
	void notifyNextPaper();
	void notifyAutomaticallyNextPaper();
	void notifyError();
	bool isScanningCanceled();

	int getPaperLeftCount() const { return m_paperLeft; }
	void setPaperLeftCount(int count) { m_paperLeft = count; }
	void decrementPaperLeftCount() { --m_paperLeft; }

	QString getName() const { return m_scannerName; }
	void setName(const QString &name) { m_scannerName = name; }
};

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

class DVAPI TPaperFormatManager
{ // singleton
public:
	class Format
	{
	public:
		TDimensionD m_size;
		Format() : m_size(0, 0) {}
		Format(const TDimensionD &size) : m_size(size) {}
	};

private:
	typedef std::map<std::string, Format> FormatTable;
	FormatTable m_formats;

	TPaperFormatManager();
	void readPaperFormat(const TFilePath &fp);
	void readPaperFormats();

public:
	static TPaperFormatManager *instance();

	// resitutisce la lista dei formati
	void getFormats(std::vector<std::string> &names) const;

	bool isValidFormat(std::string name) const;
	std::string getDefaultFormat() const;

	// nome formato --> dimensione
	TDimensionD getSize(std::string name) const;
};

#endif