/*
    * Copyright (c) 2016 ingenieux Labs
    *
    * 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 br.com.ingenieux.mojo.beanstalk.bundle;
  
  import com.amazonaws.services.elasticbeanstalk.model.ApplicationVersionDescription;
  import com.amazonaws.services.elasticbeanstalk.model.DescribeApplicationVersionsRequest;
  import com.amazonaws.services.elasticbeanstalk.model.DescribeApplicationVersionsResult;
  
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.eclipse.jgit.api.AddCommand;
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.api.PushCommand;
  import org.eclipse.jgit.api.Status;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.RepositoryBuilder;
  import org.eclipse.jgit.lib.TextProgressMonitor;
  import org.eclipse.jgit.transport.PushResult;
  import org.eclipse.jgit.transport.RefSpec;
  
  import java.io.File;
  import java.util.Date;
  
  import br.com.ingenieux.mojo.beanstalk.AbstractNeedsEnvironmentMojo;
  
  import static java.lang.String.format;
  
  /**
   * Uploads a packed war file to Amazon S3 for further Deployment.
   *
   * @since 0.2.8
   */
  @Mojo(name = "fast-deploy")
  public class FastDeployMojo extends AbstractNeedsEnvironmentMojo {
  
    /**
     * Artifact to Deploy
     */
    @Parameter(defaultValue = "${project.build.directory}/${project.build.finalName}")
    File sourceDirectory;
  
    /**
     * Git Staging Dir (should not be under target/)
     */
    @Parameter(property = "beanstalk.stagingDirectory", defaultValue = "${project.basedir}/tmp-git-deployment-staging")
    File stagingDirectory;
  
    /**
     * Use Staging Directory?
     */
    @Parameter(property = "beanstalk.useStagingDirectory", defaultValue = "false")
    boolean useStagingDirectory = false;
  
    @Parameter(defaultValue = "${project}")
    MavenProject project;
  
    /**
     * Version Description
     */
    @Parameter(property = "beanstalk.versionDescription", defaultValue = "Update from fast-deploy")
    String versionDescription;
  
    /**
     * Skip Environment Update?
     */
    @Parameter(property = "beanstalk.skipEnvironmentUpdate", defaultValue = "false")
    boolean skipEnvironmentUpdate = false;
  
    /**
     * Silent Upload?
     */
    @Parameter(property = "beanstalk.silentUpload", defaultValue = "false")
    boolean silentUpload = false;
  
    @Override
    protected void configure() {
      try {
        super.configure();
      } catch (Exception exc) {
        //getLog().warn(exc);
      }
    }
 
   @Override
   protected Object executeInternal() throws Exception {
     Git git = getGitRepo();
     String versionLabel = null;
 
     String commitId = null;
 
     Ref masterRef = git.getRepository().getRef("master");
     if (null != masterRef) {
       commitId = ObjectId.toString(masterRef.getObjectId());
     }
 
     Status status = git.status().call();
 
     boolean pushAhead = false;
 
     if (null != commitId && status.isClean()) {
       versionLabel = lookupVersionLabelForCommitId(commitId);
 
       if (null == versionLabel) {
         getLog().info("No Changes. However, we've didn't get something close in AWS Elastic Beanstalk and we're pushing ahead");
         pushAhead = true;
       } else {
         getLog().info("No Changes. However, we've got something close in AWS Elastic Beanstalk and we're continuing");
 
         project.getProperties().put("beanstalk.versionLabel", versionLabel);
 
         return null;
       }
     }
 
     if (!pushAhead) {
       // Asks for Existing Files to get added
       git.add().setUpdate(true).addFilepattern(".").call();
 
       // Now as for any new files (untracked)
 
       AddCommand addCommand = git.add();
 
       if (!status.getUntracked().isEmpty()) {
         for (String s : status.getUntracked()) {
           getLog().info("Adding file " + s);
           addCommand.addFilepattern(s);
         }
 
         addCommand.call();
       }
 
       git.commit().setAll(true).setMessage(versionDescription).call();
 
       masterRef = git.getRepository().getRef("master");
 
       commitId = ObjectId.toString(masterRef.getObjectId());
     }
 
     String environmentName = null;
 
     /*
      * Builds the remote push URL
      */
     if (null != curEnv && !skipEnvironmentUpdate) {
       environmentName = curEnv.getEnvironmentName();
     }
 
     String remote = getRemoteUrl(commitId, environmentName);
 
     getLog().info("Using remote: " + remote);
 
     /*
      * Does the Push
      */
     {
       PushCommand cmd =
           git. //
               push();
 
       if (!silentUpload) {
         cmd.setProgressMonitor(new TextProgressMonitor());
       }
 
       Iterable<PushResult> pushResults = null;
       try {
         pushResults =
             cmd.setRefSpecs(new RefSpec("HEAD:refs/heads/master"))
                 . //
                 setForce(true)
                 . //
                 setRemote(remote)
                 . //
                 call();
       } catch (Exception exc) {
         // Ignore
         getLog().debug("(Actually Expected) Exception", exc);
       }
 
       /*
        * I wish someday it could work... :(
        */
       if (null != pushResults) {
         for (PushResult pushResult : pushResults) {
           getLog().debug(" * " + pushResult.getMessages());
         }
       }
     }
 
     versionLabel = lookupVersionLabelForCommitId(commitId);
 
     if (null != versionLabel) {
       getLog().info("Deployed version " + versionLabel);
 
       project.getProperties().put("beanstalk.versionLabel", versionLabel);
     } else {
       getLog().warn("No version found. Ignoring.");
     }
 
     return null;
   }
 
   protected String getRemoteUrl(String commitId, String environmentName) throws org.apache.maven.plugin.MojoFailureException {
     return new RequestSigner(getAWSCredentials(), applicationName, regionName, commitId, environmentName, new Date()).getPushUrl();
   }
 
   protected String lookupVersionLabelForCommitId(String commitId) throws Exception {
     String versionLabel = null;
     String prefixToLookup = format("git-%s-", commitId);
 
     DescribeApplicationVersionsResult describeApplicationVersions =
         getService().describeApplicationVersions(new DescribeApplicationVersionsRequest().withApplicationName(applicationName));
 
     for (ApplicationVersionDescription avd : describeApplicationVersions.getApplicationVersions()) {
       if (avd.getVersionLabel().startsWith(prefixToLookup)) {
         versionLabel = avd.getVersionLabel();
         break;
       }
     }
 
     return versionLabel;
   }
 
   protected Git getGitRepo() throws Exception {
     Git git = null;
 
     if (!useStagingDirectory) {
       File gitRepo = new File(sourceDirectory, ".git");
 
       if (!gitRepo.exists()) {
         git = Git.init().setDirectory(sourceDirectory).call();
       } else {
         git = Git.open(gitRepo);
       }
     } else {
       File gitRepo = stagingDirectory;
       Repository r = null;
 
       RepositoryBuilder b = new RepositoryBuilder().setGitDir(stagingDirectory).setWorkTree(sourceDirectory);
 
       if (!gitRepo.exists()) {
         gitRepo.getParentFile().mkdirs();
 
         r = b.build();
 
         r.create();
       } else {
         r = b.build();
       }
 
       git = Git.wrap(r);
     }
 
     return git;
   }
 }