/*
 * point-curve nearest point routines testing
 *
 * Authors:
 * 		Marco Cecchetti <mrcekets at gmail.com>
 *
 * Copyright 2008  authors
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 */

#include <2geom/d2.h>
#include <2geom/sbasis.h>
#include <2geom/path.h>
#include <2geom/curves.h>
#include <2geom/angle.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/sbasis-geometric.h>
#include <2geom/piecewise.h>

#include <2geom/svg-path-parser.h>

#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>

#include <2geom/transforms.h>
#include <2geom/pathvector.h>


#include <algorithm>

using namespace Geom;

std::ostream&
operator<< (std::ostream &out, PathVectorTime const &pvp)
{
    return out << pvp.path_index << "." << pvp.curve_index << "." << pvp.t;
}

class NearestPoints : public Toy
{
    enum menu_item_t
    {
        FIRST_ITEM = 1,
        LINE_SEGMENT = FIRST_ITEM,
        ELLIPTICAL_ARC,
        SBASIS_CURVE,
        PIECEWISE,
        PATH,
        PATH_SVGD,
        TOTAL_ITEMS
    };

    static const char* menu_items[TOTAL_ITEMS];

private:
    PathVector paths_b;
    void draw( cairo_t *cr,	std::ostringstream *notify,
               int width, int height, bool save, std::ostringstream *timer_stream) override
    {

    	Point p = ph.pos;
    	Point np = p;
    	std::vector<Point> nps;

    	cairo_set_line_width (cr, 0.3);
        cairo_set_source_rgb(cr, 0,0,0);
    	switch ( choice )
    	{
            case '1':
            {
                LineSegment seg(psh.pts[0], psh.pts[1]);
                cairo_move_to(cr, psh.pts[0]);
                cairo_curve(cr, seg);
                double t = seg.nearestTime(p);
                np = seg.pointAt(t);
                if ( toggles[0].on )
                {
                    nps.push_back(np);
                }
                break;
            }
            case '2':
            {
    	        EllipticalArc earc;
    	        bool earc_constraints_satisfied = true;
    	        try
    	        {
                    earc.set(psh.pts[0], 200, 150, 0, true, true, psh.pts[1]);
    	        }
    	        catch( RangeError e )
    	        {
                    earc_constraints_satisfied = false;
    	        }
    	        if ( earc_constraints_satisfied )
    	        {
                    cairo_d2_sb(cr, earc.toSBasis());
                    if ( toggles[0].on )
                    {
                        std::vector<double> t = earc.allNearestTimes(p);
                        for (double i : t)
                            nps.push_back(earc.pointAt(i));
                    }
                    else
                    {
                        double t = earc.nearestTime(p);
                        np = earc.pointAt(t);
                    }
    	        }
    	        break;
            }
            case '3':
            {
                D2<SBasis> A = psh.asBezier();
                cairo_d2_sb(cr, A);
    	        if ( toggles[0].on )
    	        {
                    std::vector<double> t = Geom::all_nearest_times(p, A);
                    for (double i : t)
                        nps.push_back(A(i));
    	        }
    	        else
    	        {
                    double t = nearest_time(p, A);
                    np = A(t);
    	        }
                break;
            }
            case '4':
            {
                D2<SBasis> A = handles_to_sbasis(psh.pts.begin(), 3);
                D2<SBasis> B = handles_to_sbasis(psh.pts.begin() + 3, 3);
                D2<SBasis> C = handles_to_sbasis(psh.pts.begin() + 6, 3);
                D2<SBasis> D = handles_to_sbasis(psh.pts.begin() + 9, 3);
                cairo_d2_sb(cr, A);
                cairo_d2_sb(cr, B);
                cairo_d2_sb(cr, C);
                cairo_d2_sb(cr, D);
    	        Piecewise< D2<SBasis> > pwc;
    	        pwc.push_cut(0);
    	        pwc.push_seg(A);
    	        pwc.push_cut(0.25);
    	        pwc.push_seg(B);
    	        pwc.push_cut(0.50);
    	        pwc.push_seg(C);
    	        pwc.push_cut(0.75);
    	        pwc.push_seg(D);
    	        pwc.push_cut(1);
    	        if ( toggles[0].on )
    	        {
                    std::vector<double> t = Geom::all_nearest_times(p, pwc);
                    for (double i : t)
                        nps.push_back(pwc(i));
    	        }
    	        else
    	        {
                    double t = Geom::nearest_time(p, pwc);
                    np = pwc(t);
    	        }
                break;
            }
            case '5':
            {
                closed_toggle = true;
                BezierCurveN<3> A(psh.pts[0], psh.pts[1], psh.pts[2], psh.pts[3]);
                BezierCurveN<2> B(psh.pts[3], psh.pts[4], psh.pts[5]);
                BezierCurveN<3> C(psh.pts[5], psh.pts[6], psh.pts[7], psh.pts[8]);
                Path path;
    	        path.append(A);
    	        path.append(B);
    	        path.append(C);
    	        EllipticalArc D;
    	        bool earc_constraints_satisfied = true;
    	        try
    	        {
                    D.set(psh.pts[8], 160, 80, 0, true, true, psh.pts[9]);
    	        }
    	        catch( RangeError e )
    	        {
                    earc_constraints_satisfied = false;
    	        }
    	        if ( earc_constraints_satisfied ) path.append(D);
    	        if ( toggles[1].on ) path.close(true);

    	        cairo_path(cr, path);

    	        if ( toggles[0].on )
    	        {
                    std::vector<double> t = path.allNearestTimes(p);
                    for (double i : t)
                        nps.push_back(path.pointAt(i));
    	        }
    	        else
    	        {
                    PathTime pt = path.nearestTime(p);
                    np = path.pointAt(pt);
    	        }
                break;
            }
            case '6':
            {
                closed_toggle = true;
                PathVector pathv = paths_b*Translate(psh.pts[0]-paths_b[0][0].initialPoint());
                //std::cout << pathv.size() << std::endl;
                OptRect optRect = bounds_fast(pathv);
                
                cairo_rectangle(cr, *optRect);
                cairo_stroke(cr);

    	        cairo_path(cr, pathv);

    	        if ( toggles[0].on )
    	        {
                    std::vector<PathVectorTime> t = pathv.allNearestTimes(p);
                    for (auto & i : t)
                        nps.push_back(pathv.pointAt(i));
    	        }
    	        else
    	        {
                    //std::optional<PathVectorTime>
                    double s = 0, e = 1;
                    draw_cross(cr, pathv[0].pointAt(s));
                    draw_cross(cr, pathv[0].pointAt(e));
                    double t = pathv[0][0].nearestTime(p, 0, 1);
                    if(t) {
                        *notify << p+psh.pts[0] << std::endl;
                        *notify << t << std::endl;
                        np = pathv[0].pointAt(t);
                    }
    	        }
                break;
            }
            default:
            {
                *notify << std::endl;
                for (int i = FIRST_ITEM; i < TOTAL_ITEMS; ++i)
                {
                    *notify << "   " << i << " -  " <<  menu_items[i] << std::endl;
                }
                Toy::draw(cr, notify, width, height, save,timer_stream);
                return;
            }
    	}

    	if ( toggles[0].on )
    	{
            for (auto & np : nps)
            {
                cairo_move_to(cr, p);
                cairo_line_to(cr, np);
            }
    	}
    	else
    	{
            cairo_move_to(cr, p);
            cairo_line_to(cr, np);
    	}
        cairo_stroke(cr);

    	toggles[0].bounds = Rect( Point(10, height - 50), Point(10, height - 50) + Point(80,25) );
    	toggles[0].draw(cr);
    	if ( closed_toggle )
    	{
            toggles[1].bounds = Rect( Point(100, height - 50), Point(100, height - 50) + Point(80,25) );
            toggles[1].draw(cr);
            closed_toggle = false;
    	}

    	Toy::draw(cr, notify, width, height, save,timer_stream);
    }

    void key_hit(GdkEventKey *e) override
    {
    	choice = e->keyval;
    	switch ( choice )
    	{
            case '1':
                total_handles = 2;
                break;
            case '2':
                total_handles = 2;
                break;
            case '3':
                total_handles = 6;
                break;
            case '4':
                total_handles = 13;
                break;
            case '5':
                total_handles = 10;
                break;
            case '6':
                total_handles = 1;
                break;
            default:
                total_handles = 0;
    	}
    	psh.pts.clear();
        psh.push_back( 262.6037,35.824151);
        psh.pts[0] += Point(300,300);
        psh.push_back(0,0);
        psh.pts[1] += psh.pts[0];
        psh.push_back(-92.64892,-187.405851);
        psh.pts[2] += psh.pts[0];
        psh.push_back(30,-149.999981);
        psh.pts[3] += psh.pts[0];
    	for ( unsigned int i = 0; i < total_handles; ++i )
    	{
            psh.push_back(uniform()*400, uniform()*400);
    	}
    	ph.pos = Point(uniform()*400, uniform()*400);
    	redraw();
    }

    void mouse_pressed(GdkEventButton* e) override
    {
        toggle_events(toggles, e);
        Toy::mouse_pressed(e);
    }

public:
    void first_time(int argc, char** argv) override {
        const char *path_b_name="star.svgd";
        if(argc > 1)
            path_b_name = argv[1];
        paths_b = read_svgd(path_b_name);
    }
    NearestPoints()
        : total_handles(0), choice('0'), closed_toggle(false)
    {
        handles.push_back(&psh);
        handles.push_back(&ph);
        ph.pos = Point(uniform()*400, uniform()*400);
        toggles.emplace_back("ALL NP", false );
        toggles.emplace_back("CLOSED", false );
    }

private:
    PointSetHandle psh;
    PointHandle ph;
    std::vector<Toggle> toggles;
    unsigned int total_handles;
    char choice;
    bool closed_toggle;
};

const char* NearestPoints::menu_items[] =
{
    "",
    "LineSegment",
    "EllipticalArc",
    "SBasisCurve",
    "Piecewise",
    "Path",
    "Path from SVGD"
};



int main(int argc, char **argv)
{
    init( argc, argv, new NearestPoints() );
    return 0;
}


/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :