#include<math.h>

#include<lemon/xy.h>

#include<lemon/maps.h>

#include<lemon/list_graph.h>

///\file \ingroup misc

///Simple graph drawer

namespace lemon {

///Data structure representing RGB colors.

///Data structure representing RGB colors.

///\ingroup misc

class Color

{

  double _r,_g,_b;

public:

  ///Default constructor

  Color() {}

  ///Constructor

  Color(double r,double g,double b) :_r(r),_g(g),_b(b) {};

  ///Returns the red component

  double getR() {return _r;}

  ///Returns the green component

  double getG() {return _g;}

  ///Returns the blue component

  double getB() {return _b;}

  ///Set the color components

  void set(double r,double g,double b) { _r=r;_g=g;_b=b; };

};

///Default traits class of \ref GraphToEps

///Default traits class of \ref GraphToEps

///

///\c G is the type of the underlying graph.

template<class G>

struct DefaultGraphToEpsTraits

{

  typedef G Graph;

  typedef typename Graph::Node Node;

  typedef typename Graph::NodeIt NodeIt;

  typedef typename Graph::Edge Edge;

  typedef typename Graph::EdgeIt EdgeIt;

  typedef typename Graph::InEdgeIt InEdgeIt;

  typedef typename Graph::OutEdgeIt OutEdgeIt;

  const Graph &g;

  ConstMap<typename Graph::Node,xy<double> > _coords;

  ConstMap<typename Graph::Node,double > _nodeSizes;

  ConstMap<typename Graph::Node,Color > _nodeColors;

  ConstMap<typename Graph::Edge,Color > _edgeColors;

  ConstMap<typename Graph::Edge,double > _edgeWidths;

  double _edgeWidthScale;

  double _nodeScale;

  double _xBorder, _yBorder;

  double _scale;

  double _nodeBorderQuotient;

  bool _drawArrows;

  double _arrowLength, _arrowWidth;

  ///Constructor

  ///Constructor

  ///\param _g is a reference to the underlying graph

  DefaultGraphToEpsTraits(const G &_g) :

    g(_g), _coords(xy<double>(1,1)), _nodeSizes(1.0),

    _nodeColors(Color(1,1,1)), _edgeColors(Color(0,0,0)),

    _edgeWidths(1), _edgeWidthScale(0.3),

    _nodeScale(1.0), _xBorder(10), _yBorder(10), _scale(1.0),

    _nodeBorderQuotient(.1),

    _drawArrows(false), _arrowLength(1), _arrowWidth(0.3) {}

};

///Helper class to implement the named parameters of \ref graphToEps()

///Helper class to implement the named parameters of \ref graphToEps()

///\todo Is 'helper class' a good name for this?

///

template<class T> class GraphToEps : public T 

{

  typedef typename T::Graph Graph;

  typedef typename Graph::Node Node;

  typedef typename Graph::NodeIt NodeIt;

  typedef typename Graph::Edge Edge;

  typedef typename Graph::EdgeIt EdgeIt;

  typedef typename Graph::InEdgeIt InEdgeIt;

  typedef typename Graph::OutEdgeIt OutEdgeIt;

  bool dontPrint;

public:

  GraphToEps(const T &t) : T(t), dontPrint(false) {};

  template<class X> struct CoordsTraits : public T {

    const X &_coords;

    CoordsTraits(const T &t,const X &x) : T(t), _coords(x) {}

  };

  ///Sets the map of the node coordinates

  ///Sets the map of the node coordinates.

  ///\param x must be a node map with xy<double> or xy<int> values. 

  template<class X> GraphToEps<CoordsTraits<X> > coords(const X &x) {

    dontPrint=true;

    return GraphToEps<CoordsTraits<X> >(CoordsTraits<X>(*this,x));

  }

  template<class X> struct NodeSizesTraits : public T {

    const X &_nodeSizes;

    NodeSizesTraits(const T &t,const X &x) : T(t), _nodeSizes(x) {}

  };

  ///Sets the map of the node sizes

  ///Sets the map of the node sizes

  ///\param x must be a node map with \c double (or convertible) values. 

  template<class X> GraphToEps<NodeSizesTraits<X> > nodeSizes(const X &x)

  {

    dontPrint=true;

    return GraphToEps<NodeSizesTraits<X> >(NodeSizesTraits<X>(*this,x));

  }

   template<class X> struct EdgeWidthsTraits : public T {

    const X &_edgeWidths;

    EdgeWidthsTraits(const T &t,const X &x) : T(t), _edgeWidths(x) {}

  };

  ///Sets the map of the edge widths

  ///Sets the map of the edge widths

  ///\param x must be a edge map with \c double (or convertible) values. 

  template<class X> GraphToEps<EdgeWidthsTraits<X> > edgeWidths(const X &x)

  {

    dontPrint=true;

    return GraphToEps<EdgeWidthsTraits<X> >(EdgeWidthsTraits<X>(*this,x));

  }

  template<class X> struct NodeColorsTraits : public T {

    const X &_nodeColors;

    NodeColorsTraits(const T &t,const X &x) : T(t), _nodeColors(x) {}

  };

  ///Sets the map of the node colors

  ///Sets the map of the node colors

  ///\param x must be a node map with \ref Color values. 

  template<class X> GraphToEps<NodeColorsTraits<X> >

  nodeColors(const X &x)

  {

    dontPrint=true;

    return GraphToEps<NodeColorsTraits<X> >(NodeColorsTraits<X>(*this,x));

  }

  template<class X> struct EdgeColorsTraits : public T {

    const X &_edgeColors;

    EdgeColorsTraits(const T &t,const X &x) : T(t), _edgeColors(x) {}

  };

  ///Sets the map of the edge colors

  ///Sets the map of the edge colors

  ///\param x must be a edge map with \ref Color values. 

  template<class X> GraphToEps<EdgeColorsTraits<X> >

  edgeColors(const X &x)

  {

    dontPrint=true;

    return GraphToEps<EdgeColorsTraits<X> >(EdgeColorsTraits<X>(*this,x));

  }

  ///Sets a global scale factor for node sizes

  ///Sets a global scale factor for node sizes

  ///

  GraphToEps<T> &nodeScale(double d) {_nodeScale=d;return *this;}

  ///Sets a global scale factor for edge widths

  ///Sets a global scale factor for edge widths

  ///

  GraphToEps<T> &edgeWidthScale(double d) {_edgeWidthScale=d;return *this;}

  ///Sets a global scale factor for the whole picture

  ///Sets a global scale factor for the whole picture

  ///

  GraphToEps<T> &scale(double d) {_scale=d;return *this;}

  ///Sets the width of the border around the picture

  ///Sets the width of the border around the picture

  ///

  GraphToEps<T> &border(double b) {_xBorder=_yBorder=b;return *this;}

  ///Sets the width of the border around the picture

  ///Sets the width of the border around the picture

  ///

  GraphToEps<T> &border(double x, double y) {

    _xBorder=x;_yBorder=y;return *this;

  }

  ///Sets whether to draw arrows

  ///Sets whether to draw arrows

  ///

  GraphToEps<T> &drawArrows(bool b=true) {_drawArrows=b;return *this;}

  ///Sets the length of the arrowheads

  ///Sets the length of the arrowheads

  ///

  GraphToEps<T> &arrowLength(double d) {_arrowLength*=d;return *this;}

  ///Sets the width of the arrowheads

  ///Sets the width of the arrowheads

  ///

  GraphToEps<T> &arrowWidth(double d) {_arrowWidth*=d;return *this;}

  ~GraphToEps() 

  {

    if(dontPrint) return;

    cout << "%!PS-Adobe-2.0 EPSF-2.0\n";

    //\todo: Chech whether the graph is empty.

    BoundingBox<double> bb;

    for(NodeIt n(g);n!=INVALID;++n) {

      double ns=_nodeSizes[n]*_nodeScale;

      xy<double> p(ns,ns);

      bb+=p+_coords[n];

      bb+=-p+_coords[n];

      }

    cout << "%%BoundingBox: "

	 << bb.left()*  _scale-_xBorder << ' '

	 << bb.bottom()*_scale-_yBorder << ' '

	 << bb.right()* _scale+_xBorder << ' '

	 << bb.top()*   _scale+_yBorder << '\n';

    //x1 y1 x2 y2 cr cg cb w

    cout << "/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def\n";

    cout << "/c { newpath dup 3 index add 2 index moveto 0 360 arc } bind def\n";

    // x y r cr cg cb

    cout << "/n { setrgbcolor 2 index 2 index 2 index c fill\n"

	 << "     0 0 0 setrgbcolor dup "

	 << _nodeBorderQuotient << " mul setlinewidth "

	 << 1+_nodeBorderQuotient/2 << " div c stroke\n"

	 << "   } bind def\n";

    cout << "/arrl " << _arrowLength << " def\n";

    cout << "/arrw " << _arrowWidth << " def\n";

    // l dx_norm dy_norm

    cout << "/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def\n";

    //len w dx_norm dy_norm x1 y1 cr cg cb

    cout << "/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def\n"

	 << "       /w exch def /len exch def\n"

      //	 << "       0.1 setlinewidth x1 y1 moveto dx len mul dy len mul rlineto stroke"

	 << "       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto\n"

	 << "       len w sub arrl sub dx dy lrl\n"

	 << "       arrw dy dx neg lrl\n"

	 << "       dx arrl w add mul dy w 2 div arrw add mul sub\n"

	 << "       dy arrl w add mul dx w 2 div arrw add mul add rlineto\n"

	 << "       dx arrl w add mul neg dy w 2 div arrw add mul sub\n"

	 << "       dy arrl w add mul neg dx w 2 div arrw add mul add rlineto\n"

	 << "       arrw dy dx neg lrl\n"

	 << "       len w sub arrl sub neg dx dy lrl\n"

	 << "       closepath fill } bind def\n";

    cout << "\ngsave\n";

    if(_scale!=1.0) cout << _scale << " dup scale\n";

    cout << "%Edges:\ngsave\n";

    for(NodeIt n(g);n!=INVALID;++n)

      for(OutEdgeIt e(g,n);e!=INVALID;++e)

	if(_drawArrows) {

	  xy<double> d(_coords[g.target(e)]-_coords[g.source(e)]);

	  double l=sqrt(d.normSquare());

	  d/=l;

	  xy<double> x1(d*_nodeScale*_nodeSizes[g.source(e)]+

			_coords[g.source(e)]);

	  cout << l-(_nodeSizes[g.source(e)]+

		     _nodeSizes[g.target(e)])*_nodeScale << ' '

	       << _edgeWidths[e]*_edgeWidthScale << ' '

	       << d.x << ' ' << d.y << ' '

	       << x1.x << ' ' << x1.y << ' '

	       << _edgeColors[e].getR() << ' '

	       << _edgeColors[e].getG() << ' '

	       << _edgeColors[e].getB() << " arr\n";

	}

    	else cout << _coords[g.source(e)].x << ' '

		  << _coords[g.source(e)].y << ' '

		  << _coords[g.target(e)].x << ' '

		  << _coords[g.target(e)].y << ' '

		  << _edgeColors[e].getR() << ' '

		  << _edgeColors[e].getG() << ' '

		  << _edgeColors[e].getB() << ' '

		  << _edgeWidths[e]*_edgeWidthScale << " l\n";

    cout << "grestore\n%Nodes:\ngsave\n";

    for(NodeIt n(g);n!=INVALID;++n)

      cout << _coords[n].x << ' ' << _coords[n].y << ' '

	   << _nodeSizes[n]*_nodeScale << ' '

	   << _nodeColors[n].getR() << ' '

	   << _nodeColors[n].getG() << ' '

	   << _nodeColors[n].getB() << " n\n"; 

    cout << "grestore\ngrestore\n";

  } 

};

///Generates an EPS file from a graph

///\ingroup misc

///Generates an EPS file from a graph.

///

///This function has a lot of \ref named-templ-param "named parameters",

///they are declared as the members of class \ref GraphToEps. The following

///example shows how to use these parameters.

///\code

/// graphToEps(g).scale(10).coords(coords)

///              .nodeScale(2).nodeSizes(sizes)

///              .edgeWidthScale(.4);

///\endcode

///\sa GraphToEps

template<class G>

GraphToEps<DefaultGraphToEpsTraits<G> > graphToEps(G &g)

{

  return GraphToEps<DefaultGraphToEpsTraits<G> >(DefaultGraphToEpsTraits<G>(g));

}

}

using namespace lemon;

class ColorSet : public MapBase<int,Color>

{

public:

  Color operator[](int i) const

  {

    switch(i%8){

    case 0: return Color(0,0,0);

    case 1: return Color(1,0,0);

    case 2: return Color(0,1,0);

    case 3: return Color(0,0,1);

    case 4: return Color(1,1,0);

    case 5: return Color(1,0,1);

    case 6: return Color(0,1,1);

    case 7: return Color(1,1,1);

    }

    return Color(0,0,0);

  }

} colorSet;

int main()

{

  ListGraph g;

  typedef ListGraph::Node Node;

  typedef ListGraph::NodeIt NodeIt;

  typedef ListGraph::Edge Edge;

  typedef xy<int> Xy;

  Node n1=g.addNode();

  Node n2=g.addNode();

  Node n3=g.addNode();

  Node n4=g.addNode();

  Node n5=g.addNode();

  ListGraph::NodeMap<Xy> coords(g);

  ListGraph::NodeMap<double> sizes(g);

  ListGraph::NodeMap<int> colors(g);

  ListGraph::EdgeMap<int> ecolors(g);

  ListGraph::EdgeMap<int> widths(g);

  coords[n1]=Xy(50,50);  sizes[n1]=1; colors[n1]=1;

  coords[n2]=Xy(50,70);  sizes[n2]=2; colors[n2]=2;

  coords[n3]=Xy(70,70);  sizes[n3]=1; colors[n3]=3;

  coords[n4]=Xy(70,50);  sizes[n4]=2; colors[n4]=4;

  coords[n5]=Xy(85,60);  sizes[n5]=3; colors[n5]=5;

  Edge e;

  e=g.addEdge(n1,n2); ecolors[e]=0; widths[e]=1;

  e=g.addEdge(n2,n3); ecolors[e]=0; widths[e]=1;

  e=g.addEdge(n3,n5); ecolors[e]=0; widths[e]=3;

  e=g.addEdge(n5,n4); ecolors[e]=0; widths[e]=1;

  e=g.addEdge(n4,n1); ecolors[e]=0; widths[e]=1;

  e=g.addEdge(n2,n4); ecolors[e]=1; widths[e]=2;

  e=g.addEdge(n3,n4); ecolors[e]=2; widths[e]=1;

  graphToEps(g).scale(10).coords(coords).

    nodeScale(2).nodeSizes(sizes).

    nodeColors(composeMap(colorSet,colors)).

    edgeColors(composeMap(colorSet,ecolors)).

    edgeWidthScale(.4).edgeWidths(widths).

    drawArrows().arrowWidth(1).arrowLength(1)

    ;

}