/*
    * 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.project;
  
  import java.util.List;
  
  import org.eclipse.aether.graph.Dependency;
  
  /**
   * @author Benjamin Bentmann
   */
  public class DependencyResolutionException extends Exception {
  
      private final transient DependencyResolutionResult result;
      private final transient String detailMessage;
  
      public DependencyResolutionException(DependencyResolutionResult result, String message, Throwable cause) {
          super(message, cause);
          this.result = result;
          this.detailMessage = prepareDetailMessage(message, result);
      }
  
      private static String prepareDetailMessage(String message, DependencyResolutionResult result) {
          StringBuilder msg = new StringBuilder(message);
          msg.append(System.lineSeparator());
          for (Dependency dependency : result.getUnresolvedDependencies()) {
              msg.append("dependency: ").append(dependency).append(System.lineSeparator());
              List<Exception> exceptions = result.getResolutionErrors(dependency);
              for (Exception e : exceptions) {
                  msg.append("\t").append(e.getMessage()).append(System.lineSeparator());
              }
          }
  
          for (Exception exception : result.getCollectionErrors()) {
              msg.append(exception.getMessage()).append(System.lineSeparator());
              if (exception.getCause() != null) {
                  msg.append("\tCaused by: ")
                          .append(exception.getCause().getMessage())
                          .append(System.lineSeparator());
              }
          }
  
          return msg.toString();
      }
  
      public DependencyResolutionResult getResult() {
          return result;
      }
  
      @Override
      public String getMessage() {
          return detailMessage;
      }
  }