/*
    * 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.surefire.api.util;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.StringTokenizer;
  
  /**
   * A RunOrder specifies the order in which the tests will be run.
   *
   * @author Stefan Birkner
   */
  public class RunOrder {
      public static final RunOrder ALPHABETICAL = new RunOrder("alphabetical");
  
      public static final RunOrder FILESYSTEM = new RunOrder("filesystem");
  
      public static final RunOrder RANDOM = new RunOrder("random");
  
      public static final RunOrder REVERSE_ALPHABETICAL = new RunOrder("reversealphabetical");
  
      public static final RunOrder BALANCED = new RunOrder("balanced");
  
      public static final RunOrder FAILEDFIRST = new RunOrder("failedfirst");
  
      public static final RunOrder[] DEFAULT = new RunOrder[] {FILESYSTEM};
  
      /**
       * Returns the specified RunOrder
       *
       * @param values the runorder string value
       * @return an array of RunOrder objects, never null
       */
      public static RunOrder[] valueOfMulti(String values) {
          List<RunOrder> result = new ArrayList<>();
          if (values != null) {
              StringTokenizer stringTokenizer = new StringTokenizer(values, ",");
              while (stringTokenizer.hasMoreTokens()) {
                  result.add(valueOf(stringTokenizer.nextToken()));
              }
          }
          return result.toArray(new RunOrder[result.size()]);
      }
  
      public static RunOrder valueOf(String name) {
          if (name == null) {
              return null;
          } else {
              RunOrder[] runOrders = values();
              for (RunOrder runOrder : runOrders) {
                  if (runOrder.matches(name)) {
                      return runOrder;
                  }
              }
  
              String errorMessage = createMessageForMissingRunOrder(name);
              throw new IllegalArgumentException(errorMessage);
          }
      }
  
      private static String createMessageForMissingRunOrder(String name) {
          RunOrder[] runOrders = values(); // guaranteed non-empty
          StringBuilder message = new StringBuilder("There's no RunOrder with the name ");
          message.append(name);
          message.append(". Use one of the following RunOrders: ");
          message.append(runOrders[0]);
          for (int i = 1; i < runOrders.length; i++) {
              message.append(", ");
              message.append(runOrders[i]);
          }
          message.append('.');
          return message.toString();
      }
  
      private static RunOrder[] values() {
          return new RunOrder[] {ALPHABETICAL, FILESYSTEM, RANDOM, REVERSE_ALPHABETICAL, BALANCED, FAILEDFIRST};
      }
  
      public static String asString(RunOrder[] runOrder) {
          StringBuilder stringBuffer = new StringBuilder();
          for (int i = 0; i < runOrder.length - 1; i++) {
              stringBuffer.append(runOrder[i].name);
             stringBuffer.append(",");
         }
         stringBuffer.append(runOrder[runOrder.length - 1].name);
         return stringBuffer.toString();
     }
 
     private final String name;
 
     private RunOrder(String name) {
         this.name = name;
     }
 
     private boolean matches(String anotherName) {
         return name.equalsIgnoreCase(anotherName);
     }
 
     public String name() {
         return name;
     }
 
     @Override
     public String toString() {
         return name;
     }
 }