/* Copyright (C) 2014 A.Vontobel  
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * The license is in LICENCE-GPL.txt.
 * If not, see http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
 */

package net.sf.drawj2d.cmd;

import org.hecl.*;

/**
 * ExprCmd implements the "expr" command, which evaluates
 * a mathematical expression.
 */

public class ExprCmd implements Command {
    API api;
    boolean debug = false;
    
    public ExprCmd (API api) {
        this.api = api;
    }
    
    @Override
    public Thing cmdCode(Interp interp, Thing[] argv) throws HeclException {
        assert argv.length > 0;
        if (debug) System.out.println(argv[0].toString());
        
        StringBuilder sb = new StringBuilder();
        for (int i = 1; i < argv.length; i++) {
            if (i > 1)  sb.append(" ");
            sb.append(StringThing.get(argv[i]));
        }
        String expression = sb.toString();
        Thing th;
        
        if (argv.length > 1) {
            double val = api.expr(expression);
            th = DoubleThing.create(val);
        } else {
            throw new HeclException ("Illegal nb of arguments.");
        }
	return th;
    }
    
    /**
     * Test the expr command.
     * @param args
     */
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();
        boolean first = true;
        for (String arg : args) {
            if (first) first = false;
            else sb.append(" ");
            sb.append(arg);
        }
        String expression = sb.toString();
        if (expression.equals("")) expression = "25 + 3.0**2 + 50";
        System.out.println(expression);
        int imgtype = java.awt.image.BufferedImage.TYPE_INT_ARGB;
        java.awt.image.BufferedImage bi = new java.awt.image.BufferedImage(100, 100, imgtype);
        API a = new API(bi.createGraphics());
        double val = a.expr(expression);
        System.out.println(val);
    }
}