/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * 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, version 2 of the License.

  *

  * 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. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.mavenhtml;

 import org.apidesign.bck2brwsr.htmlpage.api.On;

 import static org.apidesign.bck2brwsr.htmlpage.api.OnEvent.*;

 import org.apidesign.bck2brwsr.htmlpage.api.Page;

 import org.apidesign.bck2brwsr.htmlpage.api.Property;

 /** HTML5 & Java demo showing the power of 

  * <a href="http://wiki.apidesign.org/wiki/AnnotationProcessor">annotation processors</a>

  * as well as other goodies.

  * 

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 @Page(xhtml="Calculator.xhtml", properties = {

     @Property(name = "display", type = double.class)

 })

 public class App {

     private static double memory;

     private static String operation;

     @On(event = CLICK, id="clear")

     static void clear() {

         memory = 0;

         operation = null;

         Calculator.setDisplay(0);

     }

     @On(event = CLICK, id= { "plus", "minus", "mul", "div" })

     static void applyOp(String op) {

         memory = Calculator.getDisplay();

         operation = op;

         Calculator.setDisplay(0);

     }

     @On(event = CLICK, id="result")

     static void computeTheValue() {

         switch (operation) {

             case "plus": Calculator.setDisplay(memory + Calculator.getDisplay()); break;

             case "minus": Calculator.setDisplay(memory - Calculator.getDisplay()); break;

             case "mul": Calculator.setDisplay(memory * Calculator.getDisplay()); break;

             case "div": Calculator.setDisplay(memory / Calculator.getDisplay()); break;

             default: throw new IllegalStateException(operation);

         }

     }

     @On(event = CLICK, id={"n0", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9"}) 

     static void addDigit(String digit) {

         digit = digit.substring(1);

         double v = Calculator.getDisplay();

         if (v == 0.0) {

             Calculator.setDisplay(Integer.parseInt(digit));

         } else {

             String txt = Double.toString(v) + digit;

             Calculator.setDisplay(Double.parseDouble(txt));

         }

     }

     static {

         Calculator.setDisplay(10.0);

         Calculator.applyBindings();

     }

 }