/*
    * 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.settings;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.apache.maven.execution.MavenExecutionRequest;
  import org.apache.maven.properties.internal.SystemProperties;
  import org.apache.maven.settings.building.DefaultSettingsBuildingRequest;
  import org.apache.maven.settings.building.SettingsBuilder;
  import org.apache.maven.settings.building.SettingsBuildingException;
  import org.apache.maven.settings.building.SettingsBuildingRequest;
  import org.codehaus.plexus.logging.AbstractLogEnabled;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  /**
   * @author jdcasey
   */
  @Named
  @Singleton
  public class DefaultMavenSettingsBuilder extends AbstractLogEnabled implements MavenSettingsBuilder {
  
      private final SettingsBuilder settingsBuilder;
  
      @Inject
      public DefaultMavenSettingsBuilder(SettingsBuilder settingsBuilder) {
          this.settingsBuilder = settingsBuilder;
      }
  
      public Settings buildSettings() throws IOException, XmlPullParserException {
          File userSettingsFile = getFile(
                  "${user.home}/.m2/settings.xml", "user.home", MavenSettingsBuilder.ALT_USER_SETTINGS_XML_LOCATION);
  
          return buildSettings(userSettingsFile);
      }
  
      public Settings buildSettings(boolean useCachedSettings) throws IOException, XmlPullParserException {
          return buildSettings();
      }
  
      public Settings buildSettings(File userSettingsFile) throws IOException, XmlPullParserException {
          File globalSettingsFile = getFile(
                  "${maven.conf}/settings.xml", "maven.conf", MavenSettingsBuilder.ALT_GLOBAL_SETTINGS_XML_LOCATION);
  
          SettingsBuildingRequest request = new DefaultSettingsBuildingRequest();
          request.setUserSettingsFile(userSettingsFile);
          request.setGlobalSettingsFile(globalSettingsFile);
          request.setSystemProperties(SystemProperties.getSystemProperties());
          return build(request);
      }
  
      public Settings buildSettings(File userSettingsFile, boolean useCachedSettings)
              throws IOException, XmlPullParserException {
          return buildSettings(userSettingsFile);
      }
  
      private Settings build(SettingsBuildingRequest request) throws IOException, XmlPullParserException {
          try {
              return settingsBuilder.build(request).getEffectiveSettings();
          } catch (SettingsBuildingException e) {
              throw new IOException(e.getMessage(), e);
          }
      }
  
      /** @since 2.1 */
      public Settings buildSettings(MavenExecutionRequest request) throws IOException, XmlPullParserException {
          SettingsBuildingRequest settingsRequest = new DefaultSettingsBuildingRequest();
          settingsRequest.setUserSettingsFile(request.getUserSettingsFile());
          settingsRequest.setGlobalSettingsFile(request.getGlobalSettingsFile());
          settingsRequest.setUserProperties(request.getUserProperties());
          settingsRequest.setSystemProperties(request.getSystemProperties());
  
          return build(settingsRequest);
      }
  
      private File getFile(String pathPattern, String basedirSysProp, String altLocationSysProp) {
          // -------------------------------------------------------------------------------------
         // Alright, here's the justification for all the regexp wizardry below...
         //
         // Continuum and other server-like apps may need to locate the user-level and
         // global-level settings somewhere other than ${user.home} and ${maven.home},
         // respectively. Using a simple replacement of these patterns will allow them
         // to specify the absolute path to these files in a customized components.xml
         // file. Ideally, we'd do full pattern-evaluation against the sysprops, but this
         // is a first step. There are several replacements below, in order to normalize
         // the path character before we operate on the string as a regex input, and
         // in order to avoid surprises with the File construction...
         // -------------------------------------------------------------------------------------
 
         String path = System.getProperty(altLocationSysProp);
 
         if (StringUtils.isEmpty(path)) {
             // TODO This replacing shouldn't be necessary as user.home should be in the
             // context of the container and thus the value would be interpolated by Plexus
             String basedir = System.getProperty(basedirSysProp);
             if (basedir == null) {
                 basedir = System.getProperty("user.dir");
             }
 
             basedir = basedir.replaceAll("\\\\", "/");
             basedir = basedir.replaceAll("\\$", "\\\\\\$");
 
             path = pathPattern.replaceAll("\\$\\{" + basedirSysProp + "\\}", basedir);
             path = path.replaceAll("\\\\", "/");
             // ---------------------------------------------------------------------------------
             // I'm not sure if this last regexp was really intended to disallow the usage of
             // network paths as user.home directory. Unfortunately it did. I removed it and
             // have not detected any problems yet.
             // ---------------------------------------------------------------------------------
             // path = path.replaceAll( "//", "/" );
 
         }
         return new File(path).getAbsoluteFile();
     }
 }