// Copyright (c) 1997,1998,1999,2000,2001  
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel).  All rights reserved. 
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// SPDX-License-Identifier: LGPL-3.0+
// 
//
// Author(s)     : Andreas Fabri, Sylvain Pion

#ifndef CGAL_GEOMVIEW_STREAM_H
#define CGAL_GEOMVIEW_STREAM_H

#include <CGAL/basic.h>

#ifdef CGAL_USE_GEOMVIEW

#include <CGAL/Bbox_2.h>
#include <CGAL/Bbox_3.h>
#include <CGAL/IO/Color.h>
#include <CGAL/IO/Ostream_iterator.h>

#include <CGAL/export/CGAL.h>

#include <map>
#include <vector>
#include <utility>
#include <string>
#include <iterator>
#include <algorithm>

namespace CGAL {

class CGAL_EXPORT Geomview_stream {
public:
    Geomview_stream(const Bbox_3 &bbox = Bbox_3(0,0,0, 1,1,1),
		    const char *machine = NULL,
		    const char *login = NULL);

    ~Geomview_stream();

    Geomview_stream &operator<<(const Color &c);
    Geomview_stream &operator<<(const std::string & s);
    Geomview_stream &operator<<(int i);
    Geomview_stream &operator<<(unsigned int i);
    Geomview_stream &operator<<(long i);
    Geomview_stream &operator<<(unsigned long i);
    Geomview_stream &operator<<(double d);

    template < class InputIterator >
    void
    draw_triangles(InputIterator begin, InputIterator end);

    Geomview_stream &operator>>(char *expr);

    void clear();
    void look_recenter();

    void set_bg_color(const Color &c);

    Color get_vertex_color() const;
    Color get_edge_color() const;
    Color get_face_color() const;

    Color set_vertex_color(const Color&);
    Color set_edge_color(const Color&);
    Color set_face_color(const Color&);

    double vcr() const;
    double vcg() const;
    double vcb() const;

    double ecr() const;
    double ecg() const;
    double ecb() const;

    double fcr() const;
    double fcg() const;
    double fcb() const;

    double get_vertex_radius() const
    {
	return radius;
    }
    double set_vertex_radius(double r)
    {
	std::swap(r, radius);
	return r;
    }

    int get_line_width() const
    {
	return line_width;
    }
    int set_line_width(int w)
    {
	std::swap(w, line_width);
        return w;
    }

    bool set_wired(bool b)
    {
	std::swap(b, wired_flag);
	return b;
    }
    bool get_wired() const
    {
	return wired_flag;
    }

    bool set_echo(bool b)
    {
	std::swap(b, echo_flag);
	return b;
    }
    bool get_echo() const
    {
	return echo_flag;
    }

    bool set_raw(bool b)
    {
	std::swap(b, raw_flag);
	return b;
    }
    bool get_raw() const
    {
	return raw_flag;
    }

    bool set_trace(bool b)
    {
	std::swap(b, trace_flag);
	return b;
    }
    bool get_trace() const
    {
	return trace_flag;
    }

    void trace(const std::string s) const
    {
        if (get_trace())
            std::cerr << s;
    }
    void trace(double d) const
    {
        if (get_trace())
            std::cerr << d << ' ';
    }
    void trace(int i) const
    {
        if (get_trace())
            std::cerr << i << ' ';
    }
    void trace(unsigned int i) const
    {
        if (get_trace())
            std::cerr << i << ' ';
    }

    bool set_binary_mode(bool b = true)
    {
	std::swap(b, binary_flag);
	return b;
    }
    bool set_ascii_mode(bool b = true)
    {
	return !set_binary_mode(!b);
    }
    bool get_binary_mode() const
    {
	return binary_flag;
    }
    bool get_ascii_mode() const
    {
	return !binary_flag;
    }

    std::string get_new_id(const std::string & s);

    const Bbox_3 & get_bbox()
    {
	return bb;
    }

    void pickplane()
    {
        pickplane(get_bbox());
    }

    static char* nth(char* s, int count);
    static void parse_point(const char* pickpoint,
		     double &x, double &y, double &z, double &w);
private:
    void setup_geomview(const char *machine, const char *login);
    void frame(const Bbox_3 &bbox);
    void pickplane(const Bbox_3 &bbox);

    Bbox_3 bb;
    Color vertex_color, edge_color, face_color;
    bool wired_flag;  // decides if we draw surfaces or edges.
    bool echo_flag;   // decides if we echo the point we get back to Geomview.
    bool raw_flag;    // decides if we output footers and headers.
    bool trace_flag;  // makes operator<<() write a trace on cerr.
    bool binary_flag; // makes operator<<() write binary format
    int line_width;   // width of edges
    double radius;    // radius of vertices
    int in, out;      // file descriptors for input and output pipes
    int pid;          // the geomview process identification
    std::map<std::string, int> id; // used to get a unique ID per type.
};

// Factorize code for Point_2 and Point_3.
template < class FT >
void
output_point(Geomview_stream &gv, const FT &x, const FT &y, const FT &z)
{
    bool ascii_bak = true; // the initialization value shuts up the compiler.
    if (!gv.get_raw()) {
    	ascii_bak = gv.set_ascii_mode();
    	gv << "(geometry " << gv.get_new_id("P")
       	   << " {appearance {linewidth 5 material {edgecolor "
           << gv.vcr() << gv.vcg() << gv.vcb() << "}}{SKEL 1 1 ";
    }

    gv << CGAL::to_double(x) << CGAL::to_double(y) << CGAL::to_double(z);

    if (!gv.get_raw()) {
        gv << "1 0\n}})";
    	gv.set_ascii_mode(ascii_bak);
    }
}

#if defined CGAL_POINT_2_H && \
   !defined CGAL_GV_OUT_POINT_2_H
#define CGAL_GV_OUT_POINT_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Point_2<R> &p)
{
    typename R::FT zero(0);
    output_point(gv, p.x(), p.y(), zero);
    return gv;
}
#endif

#if defined CGAL_POINT_3_H && \
   !defined CGAL_GV_OUT_POINT_3_H
#define CGAL_GV_OUT_POINT_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Point_3<R> &p)
{
    output_point(gv, p.x(), p.y(), p.z());
    return gv;
}
#endif

// The following code is the same for Segment_2 and Segment_3.
template < class Segment >
void
output_segment(Geomview_stream &gv, const Segment &segment)
{
    bool ascii_bak = gv.set_ascii_mode();
    gv << "(geometry " << gv.get_new_id("Seg")
       << " {appearance {linewidth "
       << gv.get_line_width() << "}{VECT "
       << 1 <<  2 << 1    // 1 polyline, two vertices, 1 color
       << 2               // the first polyline contains 2 vertices
       << 1;              // and it has 1 color

    // here are start and end points
    bool raw_bak = gv.set_raw(true);
    gv << segment.source() << segment.target();
    gv.set_raw(raw_bak);

    // and the color of the segment and its opaqueness
    gv << gv.ecr() << gv.ecg() << gv.ecb() << 1.0 << "}})";
    gv.set_ascii_mode(ascii_bak);
}

#if defined CGAL_SEGMENT_2_H && \
   !defined CGAL_GV_OUT_SEGMENT_2_H
#define CGAL_GV_OUT_SEGMENT_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Segment_2<R> &segment)
{
    output_segment(gv, segment);
    return gv;
}
#endif

#if defined CGAL_SEGMENT_3_H && \
   !defined CGAL_GV_OUT_SEGMENT_3_H
#define CGAL_GV_OUT_SEGMENT_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Segment_3<R> &segment)
{
    output_segment(gv, segment);
    return gv;
}
#endif

// The following code is the same for Triangle_2 and Triangle_3.
template < class Triangle >
void
output_triangle(Geomview_stream &gv, const Triangle &triangle)
{
    bool ascii_bak = gv.set_ascii_mode();
    gv << "(geometry " << gv.get_new_id("Tr")
       << " {appearance {+edge material {edgecolor "
       << gv.ecr()  << gv.ecg()  << gv.ecb() <<  " } shading constant}{ ";
    gv.set_binary_mode();
    // it's a planar polygon
    gv << "OFF BINARY\n"

    // it has 3 vertices, 1 face and 3 edges
       << 3 << 1 << 3;

    bool raw_bak = gv.set_raw(true);
    for(int i=0; i<3; i++)
        gv << triangle[i];
    gv.set_raw(raw_bak);

    // the face
    gv << 3 << 0 << 1 << 2 << 4 << gv.fcr() << gv.fcg() << gv.fcb() << 1.0
       << "}})";
    gv.set_ascii_mode(ascii_bak);
}

// Draws a set of triangles as OFF format (it's faster than one by one).
template < class InputIterator >
void
Geomview_stream::draw_triangles(InputIterator begin, InputIterator end)
{
    typedef typename std::iterator_traits<InputIterator>::value_type  Triangle;
    typedef typename Kernel_traits<Triangle>::Kernel                  Kernel;
    typedef typename Kernel::Point_3                                  Point;
    typedef typename Kernel::Less_xyz_3                               Comp;

    // We first copy everything in a vector to only require an InputIterator.
    std::vector<Triangle> triangles(begin, end);
    typedef typename std::vector<Triangle>::const_iterator            Tit;

    // Put the points in a map and a vector.
    // The index of a point in the vector is the value associated
    // to it in the map.
    typedef std::map<Point, int, Comp>  Point_map;
    Point_map           point_map(Kernel().less_xyz_3_object());
    std::vector<Point>  points;
    for (Tit i = triangles.begin(); i != triangles.end(); ++i)
        for (int j = 0; j < 3; ++j)
	    if (point_map.insert(typename Point_map::value_type(i->vertex(j),
					        points.size())).second)
                points.push_back(i->vertex(j));

    bool ascii_bak = get_ascii_mode();
    bool raw_bak = set_raw(true);

    // Header.
    set_binary_mode();
    (*this) << "(geometry " << get_new_id("triangles")
            << " {appearance {}{ OFF BINARY\n"
            << points.size() << triangles.size() << 0;

    // Points coordinates.
    std::copy(points.begin(), points.end(),
              Ostream_iterator<Point, Geomview_stream>(*this));

    // Triangles vertices indices.
    for (Tit tit = triangles.begin(); tit != triangles.end(); ++tit) {
        (*this) << 3;
	for (int j = 0; j < 3; ++j)
	    (*this) << point_map[tit->vertex(j)];
        (*this) << 0; // without color.
    }
    // Footer.
    (*this) << "}})";

    set_raw(raw_bak);
    set_ascii_mode(ascii_bak);
}

#if defined CGAL_TRIANGLE_2_H && \
   !defined CGAL_GV_OUT_TRIANGLE_2_H
#define CGAL_GV_OUT_TRIANGLE_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Triangle_2<R> &triangle)
{
    output_triangle(gv, triangle);
    return gv;
}
#endif

#if defined CGAL_TRIANGLE_3_H && \
   !defined CGAL_GV_OUT_TRIANGLE_3_H
#define CGAL_GV_OUT_TRIANGLE_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Triangle_3<R> &triangle)
{
    output_triangle(gv, triangle);
    return gv;
}
#endif

#if defined CGAL_TETRAHEDRON_3_H && \
   !defined CGAL_GV_OUT_TETRAHEDRON_3_H
#define CGAL_GV_OUT_TETRAHEDRON_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Tetrahedron_3<R> &t)
{
    bool ascii_bak = gv.set_ascii_mode();
    gv << "(geometry " << gv.get_new_id("Tetra")
       << " {appearance {}{ ";
    gv.set_binary_mode();
    gv << "OFF BINARY\n"

    // it has 4 vertices, 4 face and 6 edges
       << 4 << 4 << 6 ;

    // the vertices
    bool raw_bak = gv.set_raw(true);
    for(int i=0; i<4; i++)
        gv << t[i];
    gv.set_raw(raw_bak);

    // the faces
    double r = gv.fcr(),
           g = gv.fcg(),
           b = gv.fcb();
    gv << 3 << 0 << 1 << 2 << 4 << r << g << b << 1.0
       << 3 << 3 << 0 << 1 << 4 << r << g << b << 1.0
       << 3 << 3 << 1 << 2 << 4 << r << g << b << 1.0
       << 3 << 3 << 0 << 2 << 4 << r << g << b << 1.0
       << "}})";
    gv.set_ascii_mode(ascii_bak);
    return gv;
}
#endif

#if defined CGAL_SPHERE_3_H && \
   !defined CGAL_GV_OUT_SPHERE_3_H
#define CGAL_GV_OUT_SPHERE_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Sphere_3<R> &S)
{
    bool ascii_bak = gv.set_ascii_mode();
    gv << "(geometry " << gv.get_new_id("Sph")
       << " {appearance {+edge material {edgecolor "
       << gv.ecr()  << gv.ecg()  << gv.ecb() <<  "} shading constant}{ "
       << "SPHERE\n"
       << std::sqrt(CGAL::to_double(S.squared_radius())) << "\n";

    bool raw_bak = gv.set_raw(true);
    gv << Point_3<R>(S.center()) << "}})";
    gv.set_raw(raw_bak);
    gv.set_ascii_mode(ascii_bak);

    return gv;
}
#endif

#if defined CGAL_RAY_2_H && \
   !defined CGAL_GV_OUT_RAY_2_H
#define CGAL_GV_OUT_RAY_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Ray_2<R> &r)
{
    // Note: it won't work if double is not convertible to an RT...
    const Bbox_3 & bb = gv.get_bbox();
    Object result = intersection(Iso_rectangle_2<R>(
		                    Point_2<R>(bb.xmin(), bb.ymin()),
		                    Point_2<R>(bb.xmax(), bb.ymax())), r);
    Point_2<R> ipoint;
    Segment_2<R> iseg;
    if (assign(ipoint, result))
	gv << ipoint;
    else if (assign(iseg, result))
	gv << iseg;
    return gv;
}
#endif

#if defined CGAL_LINE_2_H && \
   !defined CGAL_GV_OUT_LINE_2_H
#define CGAL_GV_OUT_LINE_2_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Line_2<R> &r)
{
    // Note: it won't work if double is not convertible to an RT...
    const Bbox_3 & bb = gv.get_bbox();
    Object result = intersection(Iso_rectangle_2<R>(
		                    Point_2<R>(bb.xmin(), bb.ymin()),
		                    Point_2<R>(bb.xmax(), bb.ymax())), r);
    Point_2<R> ipoint;
    Segment_2<R> iseg;
    if (assign(ipoint, result))
	gv << ipoint;
    else if (assign(iseg, result))
	gv << iseg;
    return gv;
}
#endif

// Ray and Line drawing should be done by intersecting them with the BBox
// of the Geomview_stream.  But for now we take the easy approach.

#if defined CGAL_RAY_3_H && \
   !defined CGAL_GV_OUT_RAY_3_H
#define CGAL_GV_OUT_RAY_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Ray_3<R> &r)
{
    typename R::Segment_3 s(r.source(), r.point(1));
    gv << s;
    return gv;
}
#endif

#if defined CGAL_LINE_3_H && \
   !defined CGAL_GV_OUT_LINE_3_H
#define CGAL_GV_OUT_LINE_3_H
template < class R >
Geomview_stream&
operator<<(Geomview_stream &gv, const Line_3<R> &r)
{
    typename R::Segment_3 s(r.point(-1), r.point(1));
    gv << s;
    return gv;
}
#endif

CGAL_EXPORT Geomview_stream&
operator<<(Geomview_stream &gv, const Bbox_2 &bbox);

CGAL_EXPORT Geomview_stream&
operator<<(Geomview_stream &gv, const Bbox_3 &bbox);

#if defined CGAL_POINT_3_H && !defined CGAL_GV_IN_POINT_3_H
#define CGAL_GV_IN_POINT_3_H
template < class R >
Geomview_stream&
operator>>(Geomview_stream &gv, Point_3<R> &point)
{
    const char *gclpick =
	"(pick world pickplane * nil nil nil nil nil nil nil)";

    bool ascii_bak = gv.set_ascii_mode();
    gv << "(pickable pickplane yes) (ui-target pickplane yes)"
       << "(interest " << gclpick << ")";

    char sexpr[1024];
    gv >> sexpr;  // this reads a gcl expression

    const char* pickpoint = Geomview_stream::nth(sexpr, 3);
    // this gives something as: (0.0607123 0.0607125 4.76837e-07 0.529628)
    double x, y, z, w;
    Geomview_stream::parse_point(pickpoint, x, y, z, w);
    point = Point_3<R>(x, y, z, w);

    // we echo the input
    if (gv.get_echo())
	gv << point;

    // we are done and tell geomview to stop sending pick events
    gv << "(uninterest " << gclpick << ") (pickable pickplane no)";
    gv.set_ascii_mode(ascii_bak);

    return gv;
}
#endif

} //namespace CGAL

#ifdef CGAL_HEADER_ONLY
#include <CGAL/IO/Geomview_stream_impl.h>
#endif // CGAL_HEADER_ONLY

#endif // CGAL_USE_GEOMVIEW

#endif // CGAL_GEOMVIEW_STREAM_H