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/*
 * SonarQube Scanner API
 * Copyright (C) 2011-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonarsource.scanner.api.internal;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.Map;
import org.sonarsource.scanner.api.internal.batch.IsolatedLauncher;
import org.sonarsource.scanner.api.internal.cache.Logger;

public class IsolatedLauncherFactory implements Closeable {
  static final String ISOLATED_LAUNCHER_IMPL = "org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher";
  private final TempCleaning tempCleaning;
  private final String launcherImplClassName;
  private final Logger logger;
  private IsolatedClassloader cl;

  /**
   * For unit tests
   */
  IsolatedLauncherFactory(String isolatedLauncherClassName, TempCleaning tempCleaning, Logger logger) {
    this.tempCleaning = tempCleaning;
    this.launcherImplClassName = isolatedLauncherClassName;
    this.logger = logger;
  }

  public IsolatedLauncherFactory(Logger logger) {
    this(ISOLATED_LAUNCHER_IMPL, new TempCleaning(logger), logger);
  }

  private IsolatedClassloader createClassLoader(List jarFiles, ClassloadRules maskRules) {
    IsolatedClassloader classloader = new IsolatedClassloader(getClass().getClassLoader(), maskRules);
    classloader.addFiles(jarFiles);

    return classloader;
  }

  public IsolatedLauncher createLauncher(Map props, ClassloadRules rules) {
    if (props.containsKey(InternalProperties.SCANNER_DUMP_TO_FILE)) {
      String version = props.get(InternalProperties.SCANNER_VERSION_SIMULATION);
      if (version == null) {
        version = "5.6";
      }
      return new SimulatedLauncher(version, logger);
    }
    ServerConnection serverConnection = ServerConnection.create(props, logger);
    JarDownloader jarDownloader = new JarDownloaderFactory(serverConnection, logger, props.get("sonar.userHome")).create();

    return createLauncher(jarDownloader, rules);
  }

  IsolatedLauncher createLauncher(final JarDownloader jarDownloader, final ClassloadRules rules) {
    return AccessController.doPrivileged((PrivilegedAction) () -> {
      try {
        List jarFiles = jarDownloader.download();
        logger.debug("Create isolated classloader...");
        cl = createClassLoader(jarFiles, rules);
        IsolatedLauncher objProxy = IsolatedLauncherProxy.create(cl, IsolatedLauncher.class, launcherImplClassName, logger);
        tempCleaning.clean();

        return objProxy;
      } catch (Exception e) {
        // Catch all other exceptions, which relates to reflection
        throw new ScannerException("Unable to execute SonarQube", e);
      }
    });
  }

  @Override
  public void close() throws IOException {
    if (cl != null) {
      cl.close();
    }
  }
}