/*
    * 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.internal;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Helper class to format multiline messages to the console
   */
  public class MultilineMessageHelper {
  
      private static final int DEFAULT_MAX_SIZE = 65;
      private static final char BOX_CHAR = '*';
  
      public static String separatorLine() {
          StringBuilder sb = new StringBuilder(DEFAULT_MAX_SIZE);
          repeat(sb, '*', DEFAULT_MAX_SIZE);
          return sb.toString();
      }
  
      public static List<String> format(String... lines) {
          int size = DEFAULT_MAX_SIZE;
          int remainder = size - 4; // 4 chars = 2 box_char + 2 spaces
          List<String> result = new ArrayList<>();
          StringBuilder sb = new StringBuilder(size);
          // first line
          sb.setLength(0);
          repeat(sb, BOX_CHAR, size);
          result.add(sb.toString());
          // lines
          for (String line : lines) {
              sb.setLength(0);
              String[] words = line.split("\\s+");
              for (String word : words) {
                  if (sb.length() >= remainder - word.length() - (sb.length() > 0 ? 1 : 0)) {
                      repeat(sb, ' ', remainder - sb.length());
                      result.add(BOX_CHAR + " " + sb + " " + BOX_CHAR);
                      sb.setLength(0);
                  }
                  if (sb.length() > 0) {
                      sb.append(' ');
                  }
                  sb.append(word);
              }
  
              while (sb.length() < remainder) {
                  sb.append(' ');
              }
              result.add(BOX_CHAR + " " + sb + " " + BOX_CHAR);
          }
          // last line
          sb.setLength(0);
          repeat(sb, BOX_CHAR, size);
          result.add(sb.toString());
          return result;
      }
  
      private static void repeat(StringBuilder sb, char c, int nb) {
          for (int i = 0; i < nb; i++) {
              sb.append(c);
          }
      }
  }