/**
    * Copyright (C) 2010-2012 Joerg Bellmann <joerg.bellmann@googlemail.com>
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.googlecode.t7mp.steps;
  
  import java.io.File;
  import java.io.FileFilter;
  import java.io.IOException;
  import java.util.UUID;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.lang.StringUtils;
  
  import com.googlecode.t7mp.T7Configuration;
  import com.googlecode.t7mp.PluginLog;
  import com.googlecode.t7mp.TomcatArtifact;
  import com.googlecode.t7mp.TomcatSetupException;
  import com.googlecode.t7mp.configuration.PluginArtifactResolver;
  import com.googlecode.t7mp.configuration.ResolutionException;
  import com.googlecode.t7mp.util.ZipUtil;
  
  /**
   * TODO Comment.
   * 
   * @author Joerg Bellmann
   *
   */
  public class ResolveTomcatStep implements Step {
  
      protected PluginLog logger;
      protected T7Configuration configuration;
      protected PluginArtifactResolver artifactResolver;
  
      @Override
      public void execute(Context context) {
          this.configuration = context.getConfiguration();
          this.artifactResolver = context.getArtifactResolver();
          this.logger = context.getLog();
          if (StringUtils.isEmpty(configuration.getTomcatVersion())) {
              throw new TomcatSetupException("Version should not be null or empty.");
          }
  
          File unpackDirectory = null;
          try {
  
              TomcatArtifact tomcatArtifact = configuration.getTomcatArtifact();
              tomcatArtifact.setVersion(configuration.getTomcatVersion());
              File resolvedArtifact = artifactResolver.resolveArtifact(tomcatArtifact.getArtifactCoordinates());
              unpackDirectory = getUnpackDirectory();
              ZipUtil.unzip(resolvedArtifact, unpackDirectory);
              copyToTomcatDirectory(unpackDirectory);
          } catch (ResolutionException e) {
              logger.error(e.getMessage(), e);
              throw new TomcatSetupException(e.getMessage(), e);
          } catch (IOException e) {
              logger.error(e.getMessage(), e);
              throw new TomcatSetupException(e.getMessage(), e);
          } finally {
              if (unpackDirectory != null) {
                  try {
                      FileUtils.deleteDirectory(unpackDirectory);
                  } catch (IOException e) {
                      logger.error("Could not delete tomcat upack directory : " + unpackDirectory.getAbsolutePath());
                      logger.error(e.getMessage(), e);
                  }
              }
          }
      }
  
      private void copyToTomcatDirectory(File unpackDirectory) throws IOException {
          File[] files = unpackDirectory.listFiles(new FileFilter() {
              @Override
              public boolean accept(File file) {
                  return file.isDirectory();
              }
          });
          // should only be one
          FileUtils.copyDirectory(files[0], this.configuration.getCatalinaBase());
      }
  
      protected File getUnpackDirectory() {
          File tempDir = new File(System.getProperty("java.io.tmpdir"));
          File upackDirectory = new File(tempDir, UUID.randomUUID().toString());
          upackDirectory.mkdirs();
          return upackDirectory;
      }
  
 }