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/*
* Copyright 2013 Jeanfrancois Arcand
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/

package org.atmosphere.gwt.client.impl;

import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.SerializationException;

import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.atmosphere.gwt.client.AtmosphereGWTSerializer;

/**
 * @author p.havelaar
 */
abstract public class ServerTransportProtocol implements ServerTransport {

    private static final Logger logger = Logger.getLogger(ServerTransportProtocol.class.getName());
    
    private final AtmosphereGWTSerializer serializer;

    public ServerTransportProtocol(AtmosphereGWTSerializer serializer) {
        this.serializer = serializer;
    }

    abstract void send(String message, AsyncCallback callback);

    protected String serialize(Object message) throws SerializationException {
        return serializer.serialize(message);
    }

    private AsyncCallback defaultCallback = new AsyncCallback() {
        @Override
        public void onFailure(Throwable caught) {
            logger.log(Level.SEVERE, "Failed send", caught);
        }

        @Override
        public void onSuccess(Void result) {
            if (logger.isLoggable(Level.FINEST)) {
                logger.log(Level.FINEST, "Send succesfull");
            }
        }
    };

    @Override
    public void disconnect() {
        send(pack(MessageType.CONNECTION, ActionType.DISCONNECT), defaultCallback);
    }

    @Override
    public void broadcast(Object message) {
        if (message instanceof String) {
            send(pack(MessageType.STRING, ActionType.BROADCAST, message.toString()), defaultCallback);
        } else {
            try {
                send(pack(MessageType.OBJECT, ActionType.BROADCAST, serialize(message)), defaultCallback);
            } catch (SerializationException ex) {
                logger.log(Level.SEVERE, "Failed to serialize message", ex);
            }
        }
    }

    @Override
    public void broadcast(List messages) {
        StringBuilder packet = new StringBuilder();
        for (Object message : messages) {
            if (message instanceof String) {
                packet.append(pack(MessageType.STRING, ActionType.BROADCAST, message.toString()));
            } else {
                try {
                    packet.append(pack(MessageType.OBJECT, ActionType.BROADCAST, serialize(message)));
                } catch (SerializationException ex) {
                    logger.log(Level.SEVERE, "Failed to serialize message", ex);
                }
            }
        }
        if (packet.length() > 0) {
            send(packet.toString(), defaultCallback);
        }
    }

    @Override
    public void post(Object message, AsyncCallback callback) {
        if (message instanceof String) {
            send(pack(MessageType.STRING, ActionType.POST, message.toString()), callback);
        } else {
            try {
                send(pack(MessageType.OBJECT, ActionType.POST, serialize(message)), callback);
            } catch (SerializationException ex) {
                logger.log(Level.SEVERE, "Failed to serialize message", ex);
            }
        }
    }

    @Override
    public void post(List messages, AsyncCallback callback) {
        StringBuilder packet = new StringBuilder();
        for (Object message : messages) {
            if (message instanceof String) {
                packet.append(pack(MessageType.STRING, ActionType.POST, message.toString()));
            } else {
                try {
                    packet.append(pack(MessageType.OBJECT, ActionType.POST, serialize(message)));
                } catch (SerializationException ex) {
                    logger.log(Level.SEVERE, "Failed to serialize message", ex);
                }
            }
        }
        if (packet.length() > 0) {
            send(packet.toString(), callback);
        }
    }
    
    private enum MessageType {
        STRING("s"),
        OBJECT("o"),
        CONNECTION("c");
        
        String type;
        MessageType(String str) {
            type = str;
        }
    }
    private enum ActionType {
        BROADCAST("b"),
        POST("p"),
        DISCONNECT("d");
        
        String type;
        ActionType(String act) {
            type = act;
        }
    }
    protected String pack(MessageType msgType, ActionType actType) {
        return msgType.type + "\n" + actType.type + "\n";
    }
    protected String pack(MessageType msgType, ActionType actType, String message) {
        return msgType.type + "\n" + actType.type + "\n" + message.length() + "\n" + message;
    }
}