/**
 * The MIT License
 *
 * Copyright (c) 2010-2011 Sonatype, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.hudsonci.service.internal;

import org.hudsonci.utils.io.FileUtil;
import hudson.XmlFile;
import hudson.init.InitMilestone;
import hudson.lifecycle.RestartNotSupportedException;
import hudson.model.Hudson;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.hudsonci.service.SecurityService;
import org.hudsonci.service.ServiceRuntimeException;
import org.hudsonci.service.SystemService;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Default {@link SystemService} implementation
 *
 * @author plynch
 * @since 2.1.0
 */
@Named
@Singleton
public class SystemServiceImpl
    extends ServiceSupport
    implements SystemService
{
    private final SecurityService securityService;

    @Inject
    SystemServiceImpl(final SecurityService securityService) {
        this.securityService = checkNotNull(securityService);
    }

    public File getInstallationDirectory() {
        //securityService.checkPermission(Hudson.ADMINISTER);
        File dir;
        try {
            // verbose to help pinpoint any NPE at runtime
            ProtectionDomain pd = Hudson.class.getProtectionDomain();
            CodeSource cs = pd.getCodeSource();
            URL url = cs.getLocation();
            String path = url.getPath();
            dir = new File(path);
            // Jar containing Launcher is expected in <install>/lib/some.jar (so .jar file - lib dir - should get us the install dir)
            dir = dir.getParentFile().getParentFile();
            dir = FileUtil.canonicalize(dir);
        }
        catch (NullPointerException e) {
            throw new IllegalStateException("Could not reliably determine the installation directory", e);
        }
        return dir;
    }

    public File getLogDirectory() {
        //securityService.checkPermission(Hudson.ADMINISTER);
        // From the installation directory these are located at var/log
        File file = new File(getInstallationDirectory(), "var/log");
        file = FileUtil.canonicalize(file);
        return file;
    }

    public File getWorkingDirectory() {
        //securityService.checkPermission(Hudson.ADMINISTER);
        return getHudson().getRootDir();
    }

    public XmlFile getConfigFile()
    {
        securityService.checkPermission(Hudson.ADMINISTER);
        // Hudson.getConfigFile() is not public, so we have to duplicate some muck here
        File f = new File(getWorkingDirectory(), "config.xml");
        return new XmlFile(Hudson.XSTREAM, f);
    }

    public String getUrl()
    {
        String url = getHudson().getRootUrl();

        if (url == null) {
            log.warn("Underlying Hudson root url is null; using DEFAULT_URL");
            url = DEFAULT_URL;
        }
        else if (url.endsWith("/")) {
            url = url.substring(0, url.length() - 1);
        }

        return url;
    }

    public String getVersion()
    {
        return Hudson.getVersion().toString();
    }

    public InitMilestone getInitLevel()
    {
        return getHudson().getInitLevel();
    }

    public boolean isQuietingDown()
    {
        return getHudson().isQuietingDown();
    }

    public boolean isTerminating()
    {
        return getHudson().isTerminating();
    }

    public String getSystemMessage()
    {
        return getHudson().getSystemMessage();
    }

    public void doQuietDown()
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        try{getHudson().doQuietDown();}catch(final IOException e){}
    }

    public void doQuietDown(boolean toggle)
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        if (toggle)
        {
            log.debug("Quieting down");
            doQuietDown();
        }
        else
        {
            log.debug("Canceling quiet down");
            doCancelQuietDown();
        }
    }

    public void doCancelQuietDown()
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        getHudson().doCancelQuietDown();
    }

    public void doReload()
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        log.debug("Reloading configuration");
        try
        {
            getHudson().doReload();
        }
        catch (IOException ex)
        {
            throw new ServiceRuntimeException("Could not reload.", ex);
        }
    }

    public void doRestart(boolean safely)
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        try
        {
            if (safely)
            {
                log.debug("Restarting (safely)");
                getHudson().safeRestart();

            }
            else
            {
                log.debug("Restarting");
                getHudson().restart();
            }
        }
        catch (RestartNotSupportedException ex)
        {
            throw new ServiceRuntimeException("Restart not supported", ex);
        }
    }

    public void doRestart()
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        log.debug("Restarting");
        try
        {
            getHudson().safeRestart();
        }
        catch (RestartNotSupportedException ex)
        {
            throw new ServiceRuntimeException("Restart not supported", ex);
        }
    }

    public void doRestartSafely()
    {
        //securityService.checkPermission(Hudson.ADMINISTER);
        log.debug("Restarting (safely)");
        try
        {
            getHudson().restart();
        }
        catch (RestartNotSupportedException ex)
        {
            throw new ServiceRuntimeException("Restart not supported", ex);
        }
    }
}