/**

 * 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.lang.reflect.Method;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

import org.apidesign.bck2brwsr.core.JavaScriptOnly;

/**

 *

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

 */

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);

    @JavaScriptOnly(name = "toJS", value = "function(v) {\n" + 

        "  if (v === null) return null;\n" +

        "  if (Object.prototype.toString.call(v) === '[object Array]') {\n" +

        "    return vm.org_apidesign_bck2brwsr_emul_lang_System(false).convArray__Ljava_lang_Object_2Ljava_lang_Object_2(v);\n" +

        "  }\n" +

        "  return v.valueOf();\n" +

        "}\n"

    )

    public static native int toJS();

    private static Object convArray(Object o) {

        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] = convArray(arr[i]);

            }

            return ret;

        }

        return o;

    }

}