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/*
 * Copyright (c) 2008-2020 the original author or authors.
 *
 * 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.cometd.examples;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.cometd.bayeux.Channel;
import org.cometd.bayeux.Message;
import org.cometd.bayeux.client.ClientSessionChannel;
import org.cometd.client.BayeuxClient;
import org.cometd.client.transport.LongPollingTransport;
import org.eclipse.jetty.client.HttpClient;

public class ConsoleChatClient {
    public static void main(String[] args) throws Exception {
        ConsoleChatClient client = new ConsoleChatClient();
        client.run();
    }

    private volatile String nickname = "";
    private volatile BayeuxClient client;
    private final ChatListener chatListener = new ChatListener();
    private final MembersListener membersListener = new MembersListener();

    private void run() throws Exception {
        BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

        String defaultURL = "http://localhost:8080/cometd/cometd";
        System.err.printf("Enter Bayeux Server URL [%s]: ", defaultURL);

        String url = input.readLine();
        if (url == null) {
            return;
        }
        if (url.trim().length() == 0) {
            url = defaultURL;
        }

        while (nickname.trim().length() == 0) {
            System.err.printf("Enter nickname: ");
            nickname = input.readLine();
            if (nickname == null) {
                return;
            }
        }

        HttpClient httpClient = new HttpClient();
        httpClient.start();

        client = new BayeuxClient(url, new LongPollingTransport(null, httpClient));
        client.getChannel(Channel.META_HANDSHAKE).addListener(new InitializerListener());
        client.getChannel(Channel.META_CONNECT).addListener(new ConnectionListener());

        client.handshake();
        boolean success = client.waitFor(1000, BayeuxClient.State.CONNECTED);
        if (!success) {
            System.err.printf("Could not handshake with server at %s%n", url);
            return;
        }

        while (true) {
            String text = input.readLine();
            if (text == null || "\\q".equals(text)) {
                Map data = new HashMap<>();
                data.put("user", nickname);
                data.put("membership", "leave");
                data.put("chat", nickname + " has left");
                client.getChannel("/chat/demo").publish(data);
                client.disconnect(1000);
                break;
            }

            Map data = new HashMap<>();
            data.put("user", nickname);
            data.put("chat", text);
            client.getChannel("/chat/demo").publish(data);
        }
    }

    private void initialize() {
        client.batch(() -> {
            ClientSessionChannel chatChannel = client.getChannel("/chat/demo");
            chatChannel.subscribe(chatListener);

            ClientSessionChannel membersChannel = client.getChannel("/members/demo");
            membersChannel.subscribe(membersListener);

            Map data = new HashMap<>();
            data.put("user", nickname);
            data.put("membership", "join");
            data.put("chat", nickname + " has joined");
            chatChannel.publish(data);
        });
    }

    private void connectionEstablished() {
        System.err.printf("system: Connection to Server Opened%n");
        Map data = new HashMap<>();
        data.put("user", nickname);
        data.put("room", "/chat/demo");
        client.getChannel("/service/members").publish(data);
    }

    private void connectionClosed() {
        System.err.printf("system: Connection to Server Closed%n");
    }

    private void connectionBroken() {
        System.err.printf("system: Connection to Server Broken%n");
    }

    private class InitializerListener implements ClientSessionChannel.MessageListener {
        @Override
        public void onMessage(ClientSessionChannel channel, Message message) {
            if (message.isSuccessful()) {
                initialize();
            }
        }
    }

    private class ConnectionListener implements ClientSessionChannel.MessageListener {
        private boolean wasConnected;
        private boolean connected;

        @Override
        public void onMessage(ClientSessionChannel channel, Message message) {
            if (client.isDisconnected()) {
                connected = false;
                connectionClosed();
                return;
            }

            wasConnected = connected;
            connected = message.isSuccessful();
            if (!wasConnected && connected) {
                connectionEstablished();
            } else if (wasConnected && !connected) {
                connectionBroken();
            }
        }
    }

    private class ChatListener implements ClientSessionChannel.MessageListener {
        @Override
        public void onMessage(ClientSessionChannel channel, Message message) {
            Map data = message.getDataAsMap();
            String fromUser = (String)data.get("user");
            String text = (String)data.get("chat");
            System.err.printf("%s: %s%n", fromUser, text);
        }
    }

    private class MembersListener implements ClientSessionChannel.MessageListener {
        @Override
        public void onMessage(ClientSessionChannel channel, Message message) {
            Object data = message.getData();
            Object[] members = data instanceof List ? ((List)data).toArray() : (Object[])data;
            System.err.printf("Members: %s%n", Arrays.asList(members));
        }
    }
}