/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tuscany.sca.endpoint.hazelcast;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Properties;


/**
 * Utility to parse the config properties.
 * 
 * bind - ip[:port] - defines the local bind address and port, it defaults to the network interface with the widest 
 *                    class (ie class A is wider than class B) on port 14820 and if that port in use it will try 
 *                    incrementing by one till a free port is found.
 *             
 * multicast - groupip:port | off - defines if multicast discovery is used and if so what multicast ip group and port is used 
 *             defaults to 224.5.12.10:51482. A value of off means multicast is disabled.
 *             
 * wka - ip[:port] - a comma separated list of ip address and port for remote nodes in the domain group. The port defaults to 14820.
 *             
 * userid -  is the userid other nodes must use to connect to this domain group. The default is the default domain name.
 * 
 * password -  is the password other nodes must use to connect to this domain group. The default is 'tuscany'.
 *             
 * client - true means this is an SCAClient call           
 *             
 */
public class RegistryConfig {
    
    private String bindAddress = "*";
    private int bindPort = 14820;
    private boolean multicastDisabled = false;
    private String multicastAddress = "224.5.12.10";
    private int multicastPort = 51482;
    private List<String> wkas = new ArrayList<String>();
    private String userid;
    private String password;
    boolean client;
    
    public RegistryConfig(Properties properties) {
        init(properties);
    }

    private void init(Properties properties) {
   
        String bindValue = properties.getProperty("bind");
        if (bindValue == null) {
            InetAddress addr = chooseLocalAddress();
            if (addr != null) {
                this.bindAddress = addr.getHostAddress();
            }
        } else {
            if (bindValue.indexOf(":") == -1) {
                this.bindAddress = bindValue;
            } else {
                String[] addr = bindValue.split(":");
                this.bindAddress = addr[0];
                this.bindPort = Integer.parseInt(addr[1]);
            }
        }

        String multicastValue = properties.getProperty("multicast");
        if (multicastValue != null) {
            if ("off".equalsIgnoreCase(multicastValue)) {
                this.multicastDisabled = true;
            } else {
                if (multicastValue.indexOf(":") == -1) {
                    this.multicastAddress = multicastValue;
                } else {
                    String[] addr = multicastValue.split(":");
                    this.multicastAddress = addr[0];
                    this.multicastPort = Integer.parseInt(addr[1]);
                }
            }
        }
        
        String wkaValue = properties.getProperty("wka");
        if (wkaValue != null) {
            String[] ips = wkaValue.split(",");
            for (String ip : ips) {
                if (ip.indexOf(":") == -1) {
                    wkas.add(ip + ":14820");
                } else {
                    wkas.add(ip);
                }
            }
        }

        this.client = Boolean.parseBoolean(properties.getProperty("client", "false"));
        this.password = properties.getProperty("password", "tuscany");
        this.userid = properties.getProperty("userid", properties.getProperty("defaultDomainName", "default"));

    }

    public String getBindAddress() {
        return bindAddress;
    }

    public int getBindPort() {
        return bindPort;
    }

    public boolean isMulticastDisabled() {
        return multicastDisabled;
    }

    public String getMulticastAddress() {
        return multicastAddress;
    }

    public int getMulticastPort() {
        return multicastPort;
    }

    public List<String> getWKAs() {
        return wkas;
    }
    
    public String getUserid() {
        return userid;
    }
    public String getPassword() {
        return password;
    }

    /**
     * Use the NIC address with the widest class, ie class A instead of class B or C.
     * Bit crude but in a lot of environments a class A address (eg 10.x.x.x) is likely
     * a better choice than a class C address (eg 192.x.x.x). And the alternative to 
     * this is to just choose the first address of the first network interface which 
     * likely isn't a better choice than this approach.
     */
    protected InetAddress chooseLocalAddress() {
        InetAddress chosen = null;
        try {
            Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();
            while (nis.hasMoreElements()) {
                NetworkInterface ni = nis.nextElement();
                Enumeration<InetAddress> ips = ni.getInetAddresses();
                while (ips.hasMoreElements()) {
                    InetAddress addr = ips.nextElement();
                    if (!addr.isLoopbackAddress()) {
                        if (chosen == null) {
                            chosen = addr;
                        } else {
                            if (((int) addr.getAddress()[0] & 0xFF) < ((int) chosen.getAddress()[0] & 0xFF)) {
                                chosen = addr;
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            // ignore
        }
        return chosen;
    }
}