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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.loadbalancer.admin.cli.helper;

import com.sun.enterprise.config.serverbeans.Domain;

import java.io.OutputStream;
import java.util.Date;
import java.util.Properties;
import java.util.StringTokenizer;

import org.glassfish.internal.data.ApplicationRegistry;
import org.glassfish.loadbalancer.admin.cli.LbLogUtil;
import org.glassfish.loadbalancer.admin.cli.beans.Loadbalancer;
import org.glassfish.loadbalancer.admin.cli.reader.api.ClusterReader;
import org.glassfish.loadbalancer.admin.cli.reader.api.InstanceReader;
import org.glassfish.loadbalancer.admin.cli.reader.api.LoadbalancerReader;
import org.glassfish.loadbalancer.admin.cli.reader.api.WebModuleReader;
import org.glassfish.loadbalancer.admin.cli.reader.impl.LoadbalancerReaderImpl;
import org.glassfish.loadbalancer.admin.cli.transform.LoadbalancerVisitor;
import org.glassfish.loadbalancer.config.LbConfig;
import org.glassfish.loadbalancer.config.LbConfigs;
import org.glassfish.loadbalancer.config.LoadBalancer;
import org.glassfish.loadbalancer.config.LoadBalancers;


/**
 * Export support class
 *
 * @author Kshitiz Saxena
 */
public class LbConfigHelper {

    /**
     * exports the loadbalancer.xml from the config to the outputstream provided
     * @param ctx ConfigContext
     * @param lbConfigName name of lb-config
     * @param out OutputStream into which the loadbalancer.xml is written
     */
    public static LoadbalancerReader getLbReader(Domain domain, ApplicationRegistry appRegistry,
            String lbConfigName) throws Exception {
        // reads the load balancer related data
        LbConfigs lbConfigs = domain.getExtensionByType(LbConfigs.class);
        if (lbConfigs == null) {
            throw new Exception(LbLogUtil.getStringManager().getString("UnableToGetLbConfig", lbConfigName));
        }
        LbConfig lbConfig = lbConfigs.getLbConfig(lbConfigName);
        if (lbConfig == null) {
            throw new Exception(LbLogUtil.getStringManager().getString("UnableToGetLbConfig", lbConfigName));
        }
        return new LoadbalancerReaderImpl(domain, appRegistry, lbConfig);
    }

    public static LoadBalancer getLoadBalancer(Domain domain, String lbName) throws Exception {
        LoadBalancers loadBalancers = domain.getExtensionByType(LoadBalancers.class);
        if (loadBalancers == null) {
            throw new Exception(LbLogUtil.getStringManager().getString("UnableToGetLoadbalancer", lbName));
        }
        LoadBalancer loadBalancer = loadBalancers.getLoadBalancer(lbName);
        if (loadBalancer == null) {
            throw new Exception(LbLogUtil.getStringManager().getString("UnableToGetLoadbalancer", lbName));
        }
        return loadBalancer;
    }

    /**
     * exports the loadbalancer.xml from the config to the outputstream provided
     * @param ctx ConfigContext
     * @param lbConfigName name of lb-config
     * @param out OutputStream into which the loadbalancer.xml is written
     */
    public static void exportXml(LoadbalancerReader lbRdr, OutputStream out)
            throws Exception {

        // tranform the data using visitor pattern
        Loadbalancer _lb = new Loadbalancer();

        LoadbalancerVisitor lbVstr = new LoadbalancerVisitor(_lb);
        lbRdr.accept(lbVstr);

        try {
            String footer = LbLogUtil.getStringManager().getString("GeneratedFileFooter",
                    new Date().toString());
            // write the header
            _lb.graphManager().setDoctype(PUBLICID, SYSTEMID);
            _lb.write(out);
            out.write(footer.getBytes());
        } finally {
            if (out != null) {
                out.close();
                out = null;
            }
        }
    }

    /**
     * exports the workser.properties from the config to the outputstream provided
     * @param ctx ConfigContext
     * @param lbConfigName name of lb-config
     * @param out OutputStream into which the loadbalancer.xml is written
     */
    public static void exportWorkerProperties(LoadbalancerReader lbRdr, OutputStream out)
            throws Exception {

        // tranform the data using visitor pattern
        Loadbalancer _lb = new Loadbalancer();

        Properties props = new Properties();

        String WORKER = "worker";
        String SEPARATOR = ".";
        String HOST = "host";
        String PORT = "port";
        String LIST = "list";
        String TYPE = "type";
        String TYPE_VALUE = "ajp13";
        String LBFACTOR = "lbfactor";
        String LBFACTOR_VALUE = "1";
        String SOCKET_KEEPALIVE = "socket_keepalive";
        String SOCKET_TIMEOUT = "socket_timeout";
        String SOCKET_KEEPALIVE_VALUE = "1";
        String SOCKET_TIMEOUT_VALUE = "300";
        String LOADBALANCER = "-lb";
        String BALANCER_WORKERS = "balance_workers";
        String LB = "lb";
        String CONTEXT_ROOT_MAPPING="CONTEXT_ROOT_MAPPING";
        String APP="APP";
        StringBuffer buffer = new StringBuffer();

        String workerList = "";

        LoadbalancerVisitor lbVstr = new LoadbalancerVisitor(_lb);
        lbRdr.accept(lbVstr);

        ClusterReader clusterReaders[] = lbRdr.getClusters();

        int c;
        buffer.append("worker.properties");

        for(int i=0;i 0 ? "," : "").append(listenerHost).append(":").append(listenerPort);
            }

            props.setProperty(CLUSTER+SEPARATOR+clusterName+SEPARATOR+LISTENER,clusterHostList.toString());


            for (int m=0; m 0 ? "," : "") + webmoduleReaders[m].getContextRoot();
            }

            props.setProperty(CLUSTER+SEPARATOR+clusterName+SEPARATOR+WEB,clusterWebList);
        }

        try {

        props.store(out,buffer.toString());

        } finally {
            if (out != null) {
                out.close();
                out = null;
            }
        }
    }

    private static final String PUBLICID =
            "-//Sun Microsystems Inc.//DTD Sun Java System Application Server 9.1//EN";
    private static final String SYSTEMID = "glassfish-loadbalancer_1_3.dtd";
}