/**

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

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 *

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 * 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

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 * Notice in each file and include the License file at

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 * 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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 *

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

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package org.netbeans.html.kofx;

import net.java.html.js.JavaScriptBody;

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

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import org.json.JSONTokener;

/** Communication with WebSockets for WebView 1.8.

 *

 * @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);

        }

    }

    void onMessage(Object ev, String data) {

        Object json;

        try {

            data = data.trim();

            JSONTokener tok = new JSONTokener(data);

            Object obj;

            obj = data.startsWith("[") ? new JSONArray(tok) : new JSONObject(tok);

            json = LoadJSON.convertToArray(obj);

        } catch (JSONException ex) {

            json = 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) {"

        + "  try {"

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

        + "    ws.onopen = function(ev) { back.@org.netbeans.html.kofx.LoadWS::onOpen(Ljava/lang/Object;)(ev); };"

        + "    ws.onmessage = function(ev) { back.@org.netbeans.html.kofx.LoadWS::onMessage(Ljava/lang/Object;Ljava/lang/String;)(ev, ev.data); };"

        + "    ws.onerror = function(ev) { back.@org.netbeans.html.kofx.LoadWS::onError(Ljava/lang/Object;)(ev); };"

        + "    ws.onclose = function(ev) { back.@org.netbeans.html.kofx.LoadWS::onClose(ZILjava/lang/String;)(ev.wasClean, ev.code, ev.reason); };"

        + "    return ws;"

        + "  } catch (ex) {"

        + "    return null;"

        + "  }"

        + "} else {"

        + "  return null;"

        + "}"

    )

    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);

    }

}