#ifndef SEEN_SNAP_H

#define SEEN_SNAP_H

#include <vector>

#include "guide-snapper.h"

#include "object-snapper.h"

#include "snap-preferences.h"

enum SPGuideDragType { // used both here and in desktop-events.cpp

SP_DRAG_TRANSLATE,

SP_DRAG_ROTATE,

SP_DRAG_MOVE_ORIGIN,

SP_DRAG_NONE

};

class SPNamedView;

class SnapManager

{

public:

enum Transformation {

TRANSLATION,

SCALE,

STRETCH,

SKEW

};

SnapManager(SPNamedView const *v);

typedef std::list<const Inkscape::Snapper*> SnapperList;

bool someSnapperMightSnap() const;

bool gridSnapperMightSnap() const;

void setup(SPDesktop const *desktop,

bool snapindicator = true,

SPItem const *item_to_ignore = NULL,

std::vector<std::pair<Geom::Point, int> > *unselected_nodes = NULL,

SPGuide *guide_to_ignore = NULL);

void setup(SPDesktop const *desktop,

bool snapindicator,

std::vector<SPItem const *> &items_to_ignore,

std::vector<std::pair<Geom::Point, int> > *unselected_nodes = NULL,

SPGuide *guide_to_ignore = NULL);

// freeSnapReturnByRef() is preferred over freeSnap(), because it only returns a

// point if snapping has occurred (by overwriting p); otherwise p is untouched

void freeSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,

Geom::Point &p,

Inkscape::SnapSourceType const source_type,

bool first_point = true,

Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;

Inkscape::SnappedPoint freeSnap(Inkscape::SnapPreferences::PointType point_type,

Geom::Point const &p,

Inkscape::SnapSourceType const &source_type,

bool first_point = true,

Geom::OptRect const &bbox_to_snap = Geom::OptRect() ) const;

Geom::Point multipleOfGridPitch(Geom::Point const &t) const;

// constrainedSnapReturnByRef() is preferred over constrainedSnap(), because it only returns a

// point, by overwriting p, if snapping has occurred; otherwise p is untouched

void constrainedSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,

Geom::Point &p,

Inkscape::SnapSourceType const source_type,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point = true,

Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;

Inkscape::SnappedPoint constrainedSnap(Inkscape::SnapPreferences::PointType point_type,

Geom::Point const &p,

Inkscape::SnapSourceType const &source_type,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point = true,

Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;

void guideFreeSnap(Geom::Point &p, Geom::Point const &guide_normal, SPGuideDragType drag_type) const;

void guideConstrainedSnap(Geom::Point &p, SPGuide const &guideline) const;

Inkscape::SnappedPoint freeSnapTranslation(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Point const &tr) const;

Inkscape::SnappedPoint constrainedSnapTranslation(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &tr) const;

Inkscape::SnappedPoint freeSnapScale(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Scale const &s,

Geom::Point const &o) const;

Inkscape::SnappedPoint constrainedSnapScale(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Scale const &s,

Geom::Point const &o) const;

Inkscape::SnappedPoint constrainedSnapStretch(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Coord const &s,

Geom::Point const &o,

Geom::Dim2 d,

bool uniform) const;

Inkscape::SnappedPoint constrainedSnapSkew(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &s, // s[0] = skew factor, s[1] = scale factor

Geom::Point const &o,

Geom::Dim2 d) const;

Inkscape::GuideSnapper guide; ///< guide snapper

Inkscape::ObjectSnapper object; ///< snapper to other objects

Inkscape::SnapPreferences snapprefs;

SnapperList getSnappers() const;

SnapperList getGridSnappers() const;

SPDesktop const *getDesktop() const {return _desktop;}

SPNamedView const *getNamedView() const {return _named_view;}

SPDocument *getDocument() const;

SPGuide const *getGuideToIgnore() const {return _guide_to_ignore;}

bool getSnapIndicator() const {return _snapindicator;}

protected:

SPNamedView const *_named_view;

private:

std::vector<SPItem const *> *_items_to_ignore; ///< Items that should not be snapped to, for example the items that are currently being dragged. Set using the setup() method

SPItem const *_item_to_ignore; ///< Single item that should not be snapped to. If not NULL then this takes precedence over _items_to_ignore. Set using the setup() method

SPGuide *_guide_to_ignore; ///< A guide that should not be snapped to, e.g. the guide that is currently being dragged

SPDesktop const *_desktop;

bool _snapindicator; ///< When true, an indicator will be drawn at the position that was being snapped to

std::vector<std::pair<Geom::Point, int> > *_unselected_nodes; ///< Nodes of the path that is currently being edited and which have not been selected and which will therefore be stationary. Only these nodes will be considered for snapping to. Of each unselected node both the position (Geom::Point) and the type (Inkscape::SnapTargetType) will be stored

//TODO: Make _unselected_nodes type safe; in the line above int is used for Inkscape::SnapTargetType, but if I remember

//correctly then in other cases the int is being used for Inkscape::SnapSourceType, or for both. How to make

//this type safe?

Inkscape::SnappedPoint _snapTransformed(Inkscape::SnapPreferences::PointType type,

std::vector<std::pair<Geom::Point, int> > const &points,

Geom::Point const &pointer,

bool constrained,

Inkscape::Snapper::ConstraintLine const &constraint,

Transformation transformation_type,

Geom::Point const &transformation,

Geom::Point const &origin,

Geom::Dim2 dim,

bool uniform) const;

Geom::Point _transformPoint(std::pair<Geom::Point, int> const &p,

Transformation const transformation_type,

Geom::Point const &transformation,

Geom::Point const &origin,

Geom::Dim2 const dim,

bool const uniform) const;

void _displaySnapsource(Inkscape::SnapPreferences::PointType point_type, std::pair<Geom::Point, int> const &p) const;

Inkscape::SnappedPoint findBestSnap(Geom::Point const &p, Inkscape::SnapSourceType const source_type, SnappedConstraints &sc, bool constrained, bool noCurves = false) const;

};

#endif /* !SEEN_SNAP_H */