/**

 * 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);

    }

}