/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.javafx.experiments.dukepad.chess.client;

import com.oracle.chess.protocol.Message;

import javax.json.Json;
import javax.json.JsonObjectBuilder;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerator;
import javax.websocket.EncodeException;
import javax.websocket.Encoder;
import javax.websocket.EndpointConfig;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

/**
 * MessageEncoder class.
 *
 */
public class MessageEncoder implements Encoder.TextStream<Message> {

    // Create JSON writer factory with pretty printing enabled
    private static final Map<String, Boolean> config;
    private static final JsonWriterFactory factory;
    static {
        config = new HashMap<>();
        config.put(JsonGenerator.PRETTY_PRINTING, Boolean.TRUE);
        factory = Json.createWriterFactory(config);
    }

    @Override
    public void init(EndpointConfig config) {
    }

    @Override
    public void destroy() {
    }

    @Override
    public void encode(Message object, Writer writer) throws EncodeException, IOException {
        final JsonObjectBuilder jobj = Json.createObjectBuilder();
        object.writeTo(jobj);
        try (JsonWriter jw = factory.createWriter(writer)) {
            jw.writeObject(jobj.build());
        }
    }
}
