/**

  * 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.emul.lang;

 import java.io.Closeable;

 import java.io.IOException;

 import java.lang.reflect.Method;

 import org.apidesign.bck2brwsr.core.Exported;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 @Exported

 public class System {

     private System() {

     }

     @JavaScriptBody(args = { "value", "srcBegin", "dst", "dstBegin", "count" }, body = 

         "if (srcBegin < dstBegin) {\n" +

         "    while (count-- > 0) {\n" +

         "        dst[dstBegin + count] = value[srcBegin + count];\n" +

         "    }\n" +

         "} else {\n" +

         "    while (count-- > 0) {\n" +

         "        dst[dstBegin++] = value[srcBegin++];\n" +

         "    }\n" +

         "}"

     )

     public static void arraycopy(Object src, int srcBegin, Object dst, int dstBegin, int count) {

         try {

             Class<?> system = Class.forName("java.lang.System");

             Method m = system.getMethod("arraycopy", Object.class, int.class, Object.class, int.class, int.class);

             m.invoke(null, src, srcBegin, dst, dstBegin, count);

         } catch (Exception ex) {

             throw new IllegalStateException(ex);

         }

     }

     @JavaScriptBody(args = { "arr", "expectedSize" }, body = 

         "while (expectedSize > arr.length) { arr.push(0); }; return arr;"

     )

     public static native byte[] expandArray(byte[] arr, int expectedSize);

     @JavaScriptBody(args = { "arr", "expectedSize" }, body = 

         "while (expectedSize > arr.length) { arr.push(0); }; return arr;"

     )

     public static native char[] expandArray(char[] arr, int expectedSize);

     @JavaScriptBody(args = {}, body = "return new Date().getTime();")

     private static native double currentTimeMillisDouble();

     public static long currentTimeMillis() {

         return (long) currentTimeMillisDouble();

     }

     public static long nanoTime() {

         return 1000000L * currentTimeMillis();

     }

     @JavaScriptBody(args = { "obj" }, body="return vm.java_lang_Object(false).hashCode__I.call(obj);")

     public static native int identityHashCode(Object obj);

     public static Closeable activate() {

         return DUMMY;

     }

     private static final Closeable DUMMY = new Closeable() {

         @Override

         public void close() throws IOException {

         }

     };

     @JavaScriptBody(args = { "fn", "p" }, body = "return fn(p);")

     private static native Object invoke(Object fn, Object p);

     @Exported

     private static Object convArray(Object o, Object convToJS) {

         if (o instanceof Object[]) {

             Object[] arr = (Object[]) o;

             final int l = arr.length;

             Object[] ret = new Object[l];

             for (int i = 0; i < l; i++) {

                 ret[i] = invoke(convToJS, arr[i]);

             }

             return ret;

         }

         return o;

     }

 }