/*
 * Copyright 2016 Google LLC. All Rights Reserved.
 *
 * 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.google.cloud.tools.maven.genrepoinfo;

import com.google.cloud.tools.appengine.AppEngineException;
import com.google.cloud.tools.appengine.configuration.GenRepoInfoFileConfiguration;
import com.google.cloud.tools.maven.cloudsdk.CloudSdkMojo;
import java.io.File;
import java.util.logging.Logger;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Execute;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;

/** Generates repository information files for the Stackdriver Debugger. */
@Mojo(name = "genRepoInfoFile")
@Execute(phase = LifecyclePhase.PREPARE_PACKAGE)
public class GenRepoInfoFileMojo extends CloudSdkMojo {

  private static Logger logger = Logger.getLogger(GenRepoInfoFileMojo.class.getName());
  private static final String HOW_TO_FIX_MSG =
      "An error occurred while generating source context"
          + " files. Make sure your project is in a Git repository. To ignore source context"
          + " generation errors, use the -Dapp.genRepoInfoFile.ignoreErrors=true flag.";

  /**
   * The root directory containing the source code of the app. Expected to be contained in a git
   * repository.
   */
  @Parameter(
    alias = "genRepoInfoFile.sourceDirectory",
    defaultValue = "${project.basedir}",
    property = "app.genRepoInfoFile.sourceDirectory"
  )
  protected File sourceDirectory;

  /** Directory where the source context files will be generated. */
  @Parameter(
    alias = "genRepoInfoFile.outputDirectory",
    defaultValue = "${project.build.outputDirectory}",
    property = "app.genRepoInfoFile.outputDirectory"
  )
  protected File outputDirectory;

  /**
   * If {@code true}, ignores errors generating the source context files and proceeds to deployment.
   * If {@code false}, the goal is aborted by generation errors.
   */
  @Parameter(
    alias = "genRepoInfoFile.ignoreErrors",
    defaultValue = "false",
    property = "app.genRepoInfoFile.ignoreErrors"
  )
  protected boolean ignoreErrors;

  @Override
  public void execute() throws MojoExecutionException, MojoFailureException {
    if (skip) {
      getLog().info("Skipping appengine:genRepoInfoFile");
      return;
    }
    try {
      getAppEngineFactory()
          .genRepoInfoFile()
          .generate(
              GenRepoInfoFileConfiguration.builder()
                  .outputDirectory(outputDirectory == null ? null : outputDirectory.toPath())
                  .sourceDirectory(sourceDirectory == null ? null : sourceDirectory.toPath())
                  .build());
    } catch (AppEngineException aee) {
      if (!ignoreErrors) {
        throw new MojoExecutionException(HOW_TO_FIX_MSG, aee);
      } else {
        logger.warning(HOW_TO_FIX_MSG);
      }
    }
  }
}