/*
    * Copyright (c) 2012-present Sonatype, Inc. All rights reserved.
    *
    * This program is licensed to you under the Apache License Version 2.0,
    * and you may not use this file except in compliance with the Apache License Version 2.0.
    * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
    *
    * Unless required by applicable law or agreed to in writing,
    * software distributed under the Apache License Version 2.0 is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
   */
  package org.sonatype.install4j.maven;
  
  import java.io.File;
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Component;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.apache.tools.ant.taskdefs.ExecTask;
  import org.codehaus.plexus.util.Os;
  
  /**
   * Support for install4jc-based tasks.
   *
   * Compatible with install4j version 6.0.0 or higher.
   *
   * @since 1.0
   */
  public abstract class Install4jcMojoSupport
      extends MojoSupport
  {
    /**
     * Skip execution.
     */
    @Parameter(property = "install4j.skip", defaultValue = "false")
    protected boolean skip;
  
    /**
     * The location of the install4j installation.
     */
    @Parameter(property = "install4j.home")
    protected File installDir;
  
    /**
     * Fail if the installation is missing.
     */
    @Parameter(property = "install4j.failIfMissing", defaultValue = "false")
    protected boolean failIfMissing;
  
    @Component
    protected MavenProject project;
  
    @Override
    protected void doExecute() throws Exception {
      if (skip) {
        log.warn("Skipping execution");
        return;
      }
  
      AntHelper ant = new AntHelper(this, project);
  
      if (installDir == null) {
        maybeFailIfMissing("Install directory not configured");
        return;
      }
      if (!installDir.exists()) {
        maybeFailIfMissing("Invalid install directory: " + installDir);
        return;
      }
  
      log.debug("install4j installation directory: " + installDir);
  
      boolean windows = Os.isFamily(Os.FAMILY_WINDOWS);
      File install4jc = new File(installDir, "bin/install4jc" + (windows ? ".exe" : ""));
  
      if (!install4jc.exists()) {
        maybeFailIfMissing("Missing install4j compiler executable: " + install4jc);
        return;
      }
  
      log.debug("install4jc: " + install4jc);
  
      // ensure the binary is executable
      // FIXME: This can fail (well complain really, if we don't have perms to change the file, should check)
      ant.chmod(install4jc, "u+x");
  
      // ensure version is compatible
      VersionHelper versionHelper = new VersionHelper(log);
      String versionProperty = versionHelper.fetchVersion(ant, install4jc);
      versionHelper.ensureVersionCompatible(ant.getProperty(versionProperty));
  
      ExecTask task = ant.createTask(ExecTask.class);
      task.setExecutable(install4jc.getAbsolutePath());
      execute(ant, task);
    }
  
    protected abstract void execute(final AntHelper ant, final ExecTask task) throws Exception;
 
   private void maybeFailIfMissing(final String message) throws MojoExecutionException {
     if (failIfMissing) {
       log.error(message);
       throw new MojoExecutionException(message);
     }
     else {
       log.warn(message);
     }
   }
 }