/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2013 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

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 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

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 *

 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Oracle. Portions Copyright 2013-2013 Oracle. All Rights Reserved.

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 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

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 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

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package org.netbeans.html.ko4j;

import net.java.html.js.JavaScriptBody;

import org.apidesign.html.json.spi.JSONCall;

/** Communication with WebSockets via browser's WebSocket object.

 *

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

 */

final class LoadWS {

    private static final boolean SUPPORTED = isWebSocket();

    private final Object ws;

    private final JSONCall call;

    LoadWS(JSONCall first, String url) {

        call = first;

        ws = initWebSocket(this, url);

        if (ws == null) {

            first.notifyError(new IllegalArgumentException("Wrong URL: " + url));

        }

    }

    static boolean isSupported() {

        return SUPPORTED;

    }

    void send(JSONCall call) {

        push(call);

    }

    private synchronized void push(JSONCall call) {

        send(ws, call.getMessage());

    }

    void onOpen(Object ev) {

        if (!call.isDoOutput()) {

            call.notifySuccess(null);

        }

    }

    @JavaScriptBody(args = { "data" }, body = "try {\n"

        + "    return eval('(' + data + ')');\n"

        + "  } catch (error) {;\n"

        + "    return data;\n"

        + "  }\n"

    )

    private static native Object toJSON(String data);

    void onMessage(Object ev, String data) {

        Object json = toJSON(data);

        call.notifySuccess(json);

    }

    void onError(Object ev) {

        call.notifyError(new Exception(ev.toString()));

    }

    void onClose(boolean wasClean, int code, String reason) {

        call.notifyError(null);

    }

    @JavaScriptBody(args = {}, body = "if (window.WebSocket) return true; else return false;")

    private static boolean isWebSocket() {

        return false;

    }

    @JavaScriptBody(args = { "back", "url" }, javacall = true, body = ""

        + "if (window.WebSocket) {\n"

        + "  try {\n"

        + "    var ws = new window.WebSocket(url);\n"

        + "    ws.onopen = function(ev) {\n"

        + "      back.@org.netbeans.html.ko4j.LoadWS::onOpen(Ljava/lang/Object;)(ev);\n"

        + "    };\n"

        + "    ws.onmessage = function(ev) {\n"

        + "      back.@org.netbeans.html.ko4j.LoadWS::onMessage(Ljava/lang/Object;Ljava/lang/String;)(ev, ev.data);\n"

        + "    };\n"

        + "    ws.onerror = function(ev) {\n"

        + "      back.@org.netbeans.html.ko4j.LoadWS::onError(Ljava/lang/Object;)(ev);\n"

        + "    };\n"

        + "    ws.onclose = function(ev) {\n"

        + "      back.@org.netbeans.html.ko4j.LoadWS::onClose(ZILjava/lang/String;)(ev.wasClean, ev.code, ev.reason);\n"

        + "    };\n"

        + "    return ws;\n"

        + "  } catch (ex) {\n"

        + "    return null;\n"

        + "  }\n"

        + "} else {\n"

        + "  return null;\n"

        + "}\n"

    )

    private static Object initWebSocket(Object back, String url) {

        return null;

    }

    @JavaScriptBody(args = { "ws", "msg" }, body = ""

        + "ws.send(msg);"

    )

    private void send(Object ws, String msg) {

    }

    @JavaScriptBody(args = { "ws" }, body = "ws.close();")

    private static void close(Object ws) {

    }

    void close() {

        close(ws);

    }

}