/**

 * 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();

    }

}