/*
    * 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
    *
    *      https://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.commons.lang3.util;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.List;
  import java.util.StringTokenizer;
  import java.util.stream.Collectors;
  
  import org.apache.commons.lang3.StringUtils;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.MethodSource;
  
  /**
   * Tests {@link IterableStringTokenizer}.
   */
  class IterableStringTokenizerTest {
  
      /**
       * Delimiters from {@link StringTokenizer}.
       */
      private static final String[] DELIMITERS_ARRAY = { " ", "\t", "\n", "\r", "\f" };
  
      private static final String DELIMITERS_STRING = String.join("", DELIMITERS_ARRAY);
  
      private static final String[] DATA = { "a", "b", "c" };
  
      public static String[] delimiters() {
          return DELIMITERS_ARRAY;
      }
  
      @Test
      void testConstructorArguments1ForEach() {
          final List<String> list = new ArrayList<>();
          new IterableStringTokenizer("a,b,c").forEach(list::add);
          assertEquals(Arrays.asList("a,b,c"), list);
      }
  
      @Test
      void testConstructorArguments1ToList() {
          assertEquals(Arrays.asList("a,b,c"), new IterableStringTokenizer("a,b,c").toList());
      }
  
      void testConstructorArguments2AllDelimsToList(final String singleDelim) {
          final String data = String.join(singleDelim, DATA);
          assertEquals(Arrays.asList(DATA), new IterableStringTokenizer(data, DELIMITERS_STRING).toList());
      }
  
      @ParameterizedTest
      @MethodSource("delimiters")
      void testConstructorArguments2ForEach(final String singleDelim) {
          final List<String> list = new ArrayList<>();
          new IterableStringTokenizer(String.join(singleDelim, DATA), singleDelim).forEach(list::add);
          assertEquals(Arrays.asList(DATA), list);
      }
  
      @ParameterizedTest
      @MethodSource("delimiters")
      void testConstructorArguments2ToList(final String singleDelim) {
          assertEquals(Arrays.asList(DATA), new IterableStringTokenizer(String.join(singleDelim, DATA), singleDelim).toList());
      }
  
      @ParameterizedTest
      @MethodSource("delimiters")
      void testConstructorArguments3AllDelimsToList(final String singleDelim) {
          final String data = String.join(singleDelim, DATA);
          assertEquals(Arrays.asList("a", singleDelim, "b", singleDelim, "c"), new IterableStringTokenizer(data, DELIMITERS_STRING, true).toList());
          assertEquals(Arrays.asList(DATA), new IterableStringTokenizer(data, DELIMITERS_STRING, false).toList());
      }
  
      @ParameterizedTest
      @MethodSource("delimiters")
      void testConstructorArguments3ToList(final String singleDelim) {
          final String data = String.join(singleDelim, DATA);
          assertEquals(Arrays.asList("a", singleDelim, "b", singleDelim, "c"), new IterableStringTokenizer(data, singleDelim, true).toList());
          assertEquals(Arrays.asList(DATA), new IterableStringTokenizer(data, singleDelim, false).toList());
     }
 
     @Test
     void testEmptyString() {
         assertTrue(new IterableStringTokenizer(StringUtils.EMPTY).toList().isEmpty());
     }
 
     @Test
     void testIterator() {
         final IterableStringTokenizer tokenizer = new IterableStringTokenizer("a,b,c", ",");
         final Iterator<String> iterator = tokenizer.iterator();
         assertTrue(iterator.hasNext());
         assertEquals("a", iterator.next());
         assertTrue(iterator.hasNext());
         assertEquals("b", iterator.next());
         assertTrue(iterator.hasNext());
         assertEquals("c", iterator.next());
         assertFalse(iterator.hasNext());
     }
 
     @Test
     void testNonDefaultDelimiterToArray() {
         assertArrayEquals(new String[] {}, new IterableStringTokenizer("", "|").toArray());
         assertArrayEquals(new String[] { "a" }, new IterableStringTokenizer("a", "|").toArray());
         assertArrayEquals(new String[] { "a", "b" }, new IterableStringTokenizer("a|b", "|").toArray());
         assertArrayEquals(new String[] { "a", "b", "c" }, new IterableStringTokenizer("a|b|c", "|").toArray());
     }
 
     @Test
     void testNonDefaultDelimiterToList() {
         assertEquals(Arrays.asList(DATA), new IterableStringTokenizer("a|b|c", "|").toList());
         assertEquals(Arrays.asList(DATA), new IterableStringTokenizer("a!b!c", "!").toList());
         assertEquals(Arrays.asList(DATA), new IterableStringTokenizer("a^!b^!c", "^!").toList());
     }
 
     @Test
     void testToArray() {
         // 0 tokens
         assertArrayEquals(new String[] {}, new IterableStringTokenizer("").toArray());
         // 1 token
         assertArrayEquals(new String[] { "a" }, new IterableStringTokenizer("a").toArray());
         assertArrayEquals(new String[] { "a,b" }, new IterableStringTokenizer("a,b").toArray());
         assertArrayEquals(new String[] { "a,b,c" }, new IterableStringTokenizer("a,b,c").toArray());
         // > 1 token
         assertArrayEquals(new String[] { "a", "b" }, new IterableStringTokenizer("a b").toArray());
     }
 
     @Test
     void testToList() {
         // 0 tokens
         assertEquals(Arrays.asList(), new IterableStringTokenizer("").toList());
         // 1 token
         assertEquals(Arrays.asList("a"), new IterableStringTokenizer("a").toList());
         assertEquals(Arrays.asList("a,b"), new IterableStringTokenizer("a,b").toList());
         assertEquals(Arrays.asList("a,b,c"), new IterableStringTokenizer("a,b,c").toList());
         // > 1 token
         assertEquals(Arrays.asList("a", "b"), new IterableStringTokenizer("a b").toList());
     }
 
     @Test
     void testToStream() {
         // 0 tokens
         assertEquals(Arrays.asList(), new IterableStringTokenizer("").toList());
         // 1 token
         assertEquals(Arrays.asList("a"), new IterableStringTokenizer("a").toList());
         assertEquals(Arrays.asList("a,b"), new IterableStringTokenizer("a,b").toStream().collect(Collectors.toList()));
         assertEquals(Arrays.asList("a,b,c"), new IterableStringTokenizer("a,b,c").toStream().collect(Collectors.toList()));
         // > 1 token
         assertEquals(Arrays.asList("a", "b"), new IterableStringTokenizer("a b").toStream().collect(Collectors.toList()));
     }
 }