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/*
 * Copyright (c) 2010, 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.cluster.ssh.connect;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import java.util.logging.Logger;

import com.jcraft.jsch.JSchException;
import org.glassfish.common.util.admin.AsadminInput;
import org.glassfish.api.admin.SSHCommandExecutionException;
import com.sun.enterprise.config.serverbeans.Node;
import com.sun.enterprise.util.SystemPropertyConstants;
import com.sun.enterprise.util.StringUtils;

import org.glassfish.cluster.ssh.launcher.SSHLauncher;
import org.glassfish.hk2.api.ServiceLocator;

import java.io.ByteArrayOutputStream;

public class NodeRunnerSsh  {

    private ServiceLocator habitat;
    private Logger logger;

    private String lastCommandRun = null;

    private int commandStatus;

    private SSHLauncher sshL = null;

    public NodeRunnerSsh(ServiceLocator habitat, Logger logger) {
        this.logger = logger;
        this.habitat = habitat;
    }


    public boolean isSshNode(Node node) {

        if (node == null) {
            throw new IllegalArgumentException("Node is null");
        }
        if (node.getType() ==null)
            return false;
        return node.getType().equals("SSH");
    }

    String getLastCommandRun() {
        return lastCommandRun;
    }

    public int runAdminCommandOnRemoteNode(Node node, StringBuilder output,
                                       List args,
                                       List stdinLines) throws
            SSHCommandExecutionException, IllegalArgumentException,
            UnsupportedOperationException {

        args.add(0, AsadminInput.CLI_INPUT_OPTION);
        args.add(1, AsadminInput.SYSTEM_IN_INDICATOR); // specified to read from System.in

        if (! isSshNode(node)) {
            throw new UnsupportedOperationException(
                    "Node is not of type SSH");
        }

        String installDir = node.getInstallDirUnixStyle() + "/" +
            SystemPropertyConstants.getComponentName();
        if (!StringUtils.ok(installDir)) {
            throw new IllegalArgumentException("Node does not have an installDir");
        }

        List fullcommand = new ArrayList();

        // We can just use "nadmin" even on Windows since the SSHD provider
        // will locate the command (.exe or .bat) for us
        fullcommand.add(installDir + "/lib/nadmin");
        fullcommand.addAll(args);

        try{
            lastCommandRun = commandListToString(fullcommand);
            trace("Running command on " + node.getNodeHost() + ": " +
                    lastCommandRun);
            sshL=habitat.getService(SSHLauncher.class);
            sshL.init(node, logger);

            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            commandStatus = sshL.runCommand(fullcommand, outStream, stdinLines);
            output.append(outStream.toString());
            return commandStatus;

        }catch (JSchException | IOException ex) {
            String m1 = " Command execution failed. " +ex.getMessage();
            String m2 = "";
            Throwable e2 = ex.getCause();
            if(e2 != null) {
                m2 = e2.getMessage();
            }
            logger.severe("Command execution failed for "+ lastCommandRun);
            SSHCommandExecutionException cee = new SSHCommandExecutionException(StringUtils.cat(":",
                                            m1, m2));
            cee.setSSHSettings(sshL.toString());
            cee.setCommandRun(lastCommandRun);
            throw cee;

        } catch (java.lang.InterruptedException ei){
            ei.printStackTrace();
            String m1 = ei.getMessage();
            String m2 = "";
            Throwable e2 = ei.getCause();
            if(e2 != null) {
                m2 = e2.getMessage();
            }
            logger.severe("Command interrupted "+ lastCommandRun);
            SSHCommandExecutionException cee = new SSHCommandExecutionException(StringUtils.cat(":",
                                             m1, m2));
            cee.setSSHSettings(sshL.toString());
            cee.setCommandRun(lastCommandRun);
            throw cee;
        }
    }
    private void trace(String s) {
        logger.fine(String.format("%s: %s", this.getClass().getSimpleName(), s));
   }

    private String commandListToString(List command) {
        StringBuilder fullCommand = new StringBuilder();

        for (String s : command) {
            fullCommand.append(" ");
            fullCommand.append(s);
        }

        return fullCommand.toString();
    }
}