/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012-2015 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.vm4brwsr;

 import net.java.html.js.JavaScriptBody;

 import net.java.html.lib.Date;

 import static net.java.html.lib.Exports.NaN;

 import static net.java.html.lib.Exports.eval;

 import static net.java.html.lib.Exports.isNaN;

 import static net.java.html.lib.Exports.parseInt;

 import net.java.html.lib.Objs;

 public class LibUse {

     public static int fourtyTwo() {

         Number n = (Number) eval("6 * 7");

         return n.intValue();

     }

     public static String hiProperty(String set) {

         final Object obj = eval("var x = {}; x.x = 'Hi'; x");

         if (obj == null) {

             throw new IllegalStateException("Some Value returned " + obj);

         }

         if (!(obj instanceof Objs)) {

             throw new IllegalStateException("The result is Objs: " + obj.getClass());

         }

         Objs js = (Objs) obj;

         if (set != null) {

             js.$set("x", set);

         }

         return (String) js.$get("x");

     }

     public static double parse(String str) throws Exception {

         return parseInt(str);

     }

     public static double parse(String str, int radix) throws Exception {

         return parseInt(str, radix);

     }

     public boolean checkNaN() throws Exception {

         double nan = NaN;

         return isNaN(nan);

     }

     public double dateOperation() throws Exception {

         Date eleven = new Date(2016, 1, 10);

         return eleven.getFullYear() + eleven.getMonth();

     }

     public static double arrayForEach() throws Exception {

         net.java.html.lib.Array<java.lang.Number> arr = new net.java.html.lib.Array<>();

         assertNumber(arr.length.get(), 0.0, "Empty at first");

         arr.push(1.1, 2.2, 3);

         assertNumber(arr.$get(0), 1.1, "1.1 is on position 0");

         assertNumber(arr.$get(1), 2.2, "2.2 is on position 1");

         assertNumber(arr.$get(2), 3.0, "3 is on position 2");

         final boolean[] called = { false };

         final double[] sum = { 0.0 };

         arr.forEach(new net.java.html.lib.Function.A1<java.lang.Number,Void>() {

             @Override

             public Void call(java.lang.Number p1) {

                 called[0] = true;

                 sum[0] += p1.doubleValue();

                 return null;

             }

             @Override

             public Void call(Number p1, Object p2) {

                 return call(p1);

             }

             @Override

             public Void call(Number p1, Object p2, Object p3) {

                 return call(p1);

             }

             @Override

             public Void call(Number p1, Object p2, Object p3, Object p4) {

                 return call(p1);

             }

             @Override

             public Void call(Number p1, Object p2, Object p3, Object p4, Object p5) {

                 return call(p1);

             }

         });

         assertTrue(called[0], "forEach invoked");

         assertEquals(sum[0], 6.3, 0.1, "Sum computed");

         return sum[0];

     }

     private static void assertEquals(double real, double expected, double delta, String msg) {

         if (expected - delta < real && real < expected + delta) {

             return;

         }

         raise(msg + " exp: " + expected + " but was: " + real);

     }

     @JavaScriptBody(args = { "msg" }, body = "throw msg;")

     private static native void raise(String msg);

     private static void assertNumber(Object value, double expected, String msg) {

         if (value instanceof Number) {

             assertEquals(((Number)value).doubleValue(), expected, 0.1, msg);

         } else {

             if (value == null) {

                 raise("null is not a number");

                 return;

             }

             raise("Not a number: " + value + " type: " + value.getClass());

         }

     }

     private static void assertTrue(boolean b, String msg) {

         if (!b) {

             raise(msg);

         }

     }

 }