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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
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 * recipient has the option to distribute your version of this file under
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 */

package com.sun.enterprise.admin.cli.remote;

import com.sun.enterprise.admin.cli.*;
import java.io.*;
import java.net.*;
import java.util.logging.*;
import org.glassfish.api.admin.*;

/**
 * Domain Admin Server utility method.
 */
public class DASUtils {
    private static final Logger logger =
                        Logger.getLogger("javax.enterprise.admin.cli.remote");

public enum Error {
        NONE, AUTHENTICATION, CONNECTION, IO, UNKNOWN
    };

    private DASUtils() {
        // can't instantiate
    }

    /**
     * See if DAS is alive.
     * Do not print out the results of the version command from the server.
     *
     * @return true if DAS can be reached and can handle commands,
     * otherwise false.
     */
    public static boolean pingDASQuietly(ProgramOptions programOpts,
            Environment env) {
        try {
            RemoteCLICommand cmd = new RemoteCLICommand("version", programOpts, env);
            cmd.executeAndReturnOutput(new String[]{"version"});
            return true;
        }
        catch (AuthenticationException aex) {
            return true;
        }
        catch (Exception ex) {
            ExceptionAnalyzer ea = new ExceptionAnalyzer(ex);
            if(ea.getFirstInstanceOf(ConnectException.class) != null) {
                logger.finer("Got java.net.ConnectException");
                return false; // this definitely means server is not up
            }
            else if(ea.getFirstInstanceOf(IOException.class) != null) {
                if (logger.isLoggable(Level.FINER))
                    logger.finer("It appears that server has started, but for" +
                        " some reason this exception was thrown: " +
                        ex.getMessage());
                return true;
            }
            else {
                return false; // unknown error, shouldn't really happen
            }
        }
    }

    /**
     * See if DAS is alive, but insist that athentication is correct.
     * Do not print out the results of the version command from the server.
     *
     * @return Error code indicating status
     */
    public static Error pingDASWithAuth(ProgramOptions programOpts,
            Environment env) throws CommandException {
        try {
            RemoteCLICommand cmd = new RemoteCLICommand("version", programOpts, env);
            cmd.executeAndReturnOutput(new String[]{"version"});
        }
        catch (AuthenticationException aex) {
            return Error.AUTHENTICATION;
        }
        catch (Exception ex) {
            ExceptionAnalyzer ea = new ExceptionAnalyzer(ex);
            if(ea.getFirstInstanceOf(ConnectException.class) != null) {
                logger.finer("Got java.net.ConnectException");
                return Error.CONNECTION;
            }
            else if(ea.getFirstInstanceOf(IOException.class) != null) {
                if (logger.isLoggable(Level.FINER))
                    logger.finer("It appears that server has started, but for" +
                        " some reason this exception was thrown: " +
                        ex.getMessage());
                return Error.IO;
            }
            else {
                return Error.UNKNOWN;
            }
        }
        return Error.NONE;
    }
}