/**

  * 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.ko2brwsr;

 import net.java.html.js.JavaScriptBody;

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

 /** 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);

         }

     }

     @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.apidesign.bck2brwsr.ko2brwsr.LoadWS::onOpen(Ljava/lang/Object;)(ev);\n"

         + "    };\n"

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

         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onMessage(Ljava/lang/Object;Ljava/lang/String;)(ev, ev.data);\n"

         + "    };\n"

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

         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onError(Ljava/lang/Object;)(ev);\n"

         + "    };\n"

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

         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.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);

     }

 }