/*
    * Copyright 2017-2022 original authors
    *
    * 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
    *
    * https://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 io.micronaut.build.aot;
  
  import io.micronaut.build.Packaging;
  import io.micronaut.build.services.CompilerService;
  import org.apache.commons.io.FileUtils;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.project.MavenProject;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.resolution.DependencyResolutionException;
  
  import java.io.File;
  import java.io.IOException;
  
  /**
   * Abstract Mojo for Micronaut AOT.
   */
  public abstract class AbstractMicronautAotMojo extends AbstractMojo {
  
      protected final CompilerService compilerService;
  
      protected final MavenProject mavenProject;
  
      protected final MavenSession mavenSession;
  
      protected final RepositorySystem repositorySystem;
  
      /**
       * Micronaut AOT runtime. Possible values: <code>jit</code>, <code>native</code>.
       */
      @Parameter(property = "micronaut.aot.runtime", required = true, defaultValue = "jit")
      protected String runtime;
  
      /**
       * Micronaut AOT version.
       */
      @Parameter(property = "micronaut.aot.version", required = true)
      protected String micronautAotVersion;
  
      /**
       * Whether to enable or disable Micronaut AOT.
       */
      @Parameter(property = "micronaut.aot.enabled", defaultValue = "false")
      protected boolean enabled;
  
      /**
       * Directory where compiled application classes are.
       */
      @Parameter(defaultValue = "${project.build.outputDirectory}", required = true)
      protected File outputDirectory;
  
      public AbstractMicronautAotMojo(CompilerService compilerService, MavenProject mavenProject, MavenSession mavenSession, RepositorySystem repositorySystem) {
          this.compilerService = compilerService;
          this.mavenProject = mavenProject;
          this.mavenSession = mavenSession;
          this.repositorySystem = repositorySystem;
      }
  
      abstract void onSuccess(File outputDir) throws MojoExecutionException;
  
      protected final File getBaseOutputDirectory() {
          File targetDirectory = new File(mavenProject.getBuild().getDirectory(), "aot");
          return new File(targetDirectory, runtime);
      }
  
      protected final File outputFile(String name) {
          return new File(getBaseOutputDirectory(), name);
      }
  
      @Override
      public final void execute() throws MojoExecutionException, MojoFailureException {
          if (!enabled) {
              return;
          }
          validateRuntime();
          getLog().info("Running Micronaut AOT " + micronautAotVersion + " " + getName());
          try {
              File baseOutputDirectory = getBaseOutputDirectory();
              clean(baseOutputDirectory);
              clean(outputDirectory);
              doExecute();
             onSuccess(baseOutputDirectory);
         } catch (DependencyResolutionException | IOException e) {
             throw new MojoExecutionException("Unable to generate AOT optimizations", e);
         }
     }
 
     private void clean(File baseOutputDirectory) throws IOException {
         if (baseOutputDirectory.exists()) {
             getLog().debug("Deleting " + baseOutputDirectory.getAbsolutePath());
             FileUtils.deleteDirectory(baseOutputDirectory);
         }
         baseOutputDirectory.mkdirs();
     }
 
     private void validateRuntime() {
         Packaging packaging = Packaging.of(mavenProject.getPackaging());
         AotRuntime aotRuntime = AotRuntime.valueOf(runtime.toUpperCase());
         switch (packaging) {
             case JAR:
             case DOCKER_CRAC:
             case DOCKER:
                 if (aotRuntime != AotRuntime.JIT) {
                     warnRuntimeMismatchAndSetCorrectValue(AotRuntime.JIT);
                 }
                 break;
 
             case NATIVE_IMAGE:
             case DOCKER_NATIVE:
                 if (aotRuntime != AotRuntime.NATIVE) {
                     warnRuntimeMismatchAndSetCorrectValue(AotRuntime.NATIVE);
                 }
                 break;
             default:
                 throw new IllegalArgumentException("Unsupported packaging: " + packaging);
         }
     }
 
     private void warnRuntimeMismatchAndSetCorrectValue(final AotRuntime correctRuntime) {
         String correctRuntimeString = correctRuntime.name().toLowerCase();
         getLog().warn("Packaging is set to [" + mavenProject.getPackaging() + "], but Micronaut AOT runtime is set to [" + runtime + "]. Setting AOT runtime to: [" + correctRuntimeString + "]");
         this.runtime = correctRuntimeString;
     }
 
     protected abstract void doExecute() throws DependencyResolutionException, MojoExecutionException;
 
     abstract String getName();
 }