/*
    * 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;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.toolchain.Toolchain;
  import org.apache.maven.toolchain.ToolchainManager;
  import org.codehaus.plexus.util.Os;
  
  import java.io.File;
  
  /**
   * Utility methods for different mojos.
   */
  public final class MojoUtils {
  
      private static final String JAVA = "java";
  
      private MojoUtils() {
      }
  
      public static String findJavaExecutable(ToolchainManager toolchainManager, MavenSession mavenSession) {
          String executable;
          Toolchain toolchain = toolchainManager.getToolchainFromBuildContext("jdk", mavenSession);
          if (toolchain != null) {
              executable = toolchain.findTool(JAVA);
          } else {
              File javaBinariesDir = new File(new File(System.getProperty("java.home")), "bin");
              if (Os.isFamily(Os.FAMILY_UNIX)) {
                  executable = new File(javaBinariesDir, JAVA).getAbsolutePath();
              } else if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                  executable = new File(javaBinariesDir, "java.exe").getAbsolutePath();
              } else {
                  executable = JAVA;
              }
          }
          return executable;
      }
  }