/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.maven.rtinfo.internal;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.Validate;
  import org.apache.maven.rtinfo.RuntimeInformation;
  import org.eclipse.aether.version.InvalidVersionSpecificationException;
  import org.eclipse.aether.version.Version;
  import org.eclipse.aether.version.VersionConstraint;
  import org.eclipse.aether.version.VersionScheme;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Provides information about the current Maven runtime.
   */
  @Named
  @Singleton
  public class DefaultRuntimeInformation implements RuntimeInformation {
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      private final VersionScheme versionScheme;
  
      private final String mavenVersion;
  
      @Inject
      public DefaultRuntimeInformation(final VersionScheme versionScheme) {
          this.versionScheme = versionScheme;
          this.mavenVersion = loadMavenVersion();
      }
  
      @Override
      public String getMavenVersion() {
          return mavenVersion;
      }
  
      private String loadMavenVersion() {
          Properties props = new Properties();
  
          String resource = "META-INF/maven/org.apache.maven/maven-core/pom.properties";
  
          try (InputStream is = DefaultRuntimeInformation.class.getResourceAsStream("/" + resource)) {
              if (is != null) {
                  props.load(is);
              } else {
                  logger.warn("Could not locate " + resource + " on classpath, Maven runtime information not available");
              }
          } catch (IOException e) {
              String msg = "Could not parse " + resource + ", Maven runtime information not available";
              if (logger.isDebugEnabled()) {
                  logger.warn(msg, e);
              } else {
                  logger.warn(msg);
              }
          }
  
          String version = props.getProperty("version", "").trim();
  
          if (!version.startsWith("${")) {
              return version;
          } else {
              return "";
          }
      }
  
      @Override
      public boolean isMavenVersion(String versionRange) {
          Validate.notBlank(versionRange, "versionRange can neither be null, empty nor blank");
  
          VersionConstraint constraint;
          try {
              constraint = versionScheme.parseVersionConstraint(versionRange);
          } catch (InvalidVersionSpecificationException e) {
              throw new IllegalArgumentException(e.getMessage(), e);
          }
  
         Version current;
         try {
             String mavenVersion = getMavenVersion();
             Validate.validState(StringUtils.isNotEmpty(mavenVersion), "Could not determine current Maven version");
 
             current = versionScheme.parseVersion(mavenVersion);
         } catch (InvalidVersionSpecificationException e) {
             throw new IllegalStateException("Could not parse current Maven version: " + e.getMessage(), e);
         }
 
         if (constraint.getRange() == null) {
             return constraint.getVersion().compareTo(current) <= 0;
         }
         return constraint.containsVersion(current);
     }
 }