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   *  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.causeway.commons.internal.base;
  
  import java.nio.charset.StandardCharsets;
  import java.util.stream.Collectors;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.CoreMatchers.nullValue;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import org.apache.causeway.commons.internal._Constants;
  
  class StringsTest {
  
      @Test
      void isEmpty() throws Exception {
          assertThat(_Strings.isEmpty(" 12 aBc"), is(false));
          assertThat(_Strings.isEmpty(""), is(true));
          assertThat(_Strings.isEmpty(null), is(true));
      }
  
      @Test
      void isNotEmpty() throws Exception {
          assertThat(_Strings.isNotEmpty(" 12 aBc"), is(true));
          assertThat(_Strings.isNotEmpty(""), is(false));
          assertThat(_Strings.isNotEmpty(null), is(false));
      }
  
      @Test
      void substring() throws Exception {
          assertThat(_Strings.substring("12abc", 0, 5), is("12abc"));
          assertThat(_Strings.substring("12abc", 1, 5), is("2abc"));
          assertThat(_Strings.substring("12abc", 0, 4), is("12ab"));
          assertThat(_Strings.substring("12abc", 0, -1), is("12ab"));
          assertThat(_Strings.substring("12abc", 10, -10), is("")); // index overflow
          assertThat(_Strings.substring(null, 1, 1), nullValue());
      }
  
      @Test
      void lowerWithNull() throws Exception {
          assertThat(
                  _Strings.lower(null),
                  nullValue());
      }
  
      @Test
      void lowerMixed() throws Exception {
          assertThat(
                  _Strings.lower("12aBc"),
                  is("12abc"));
      }
  
      @Test
      void upperWithNull() throws Exception {
          assertThat(
                  _Strings.upper(null),
                  nullValue());
      }
  
      @Test
      void upperMixed() throws Exception {
          assertThat(
                  _Strings.upper("12aBc"),
                  is("12ABC"));
      }
  
      @Test
      void capitalizeWithNull() throws Exception {
          assertThat(
                  _Strings.capitalize(null),
                  nullValue());
      }
  
      @Test
      void capitalizeSize0() throws Exception {
          assertThat(
                  _Strings.capitalize(""),
                  is(""));
      }
  
      @Test
      void capitalizeSize1() throws Exception {
          assertThat(
                  _Strings.capitalize("a"),
                  is("A"));
      }
  
      @Test
      void capitalizeSize2() throws Exception {
          assertThat(
                  _Strings.capitalize("ab"),
                  is("Ab"));
      }
  
      @Test
      void trimWithNull() throws Exception {
          assertThat(
                  _Strings.trim(null),
                  nullValue());
      }
  
      @Test
      void trimMixed() throws Exception {
          assertThat(
                  _Strings.trim(" 12 aBc"),
                  is("12 aBc"));
      }
  
      @Test
      void splitThenStreamWithNull() throws Exception {
          assertThat(
                  _Strings.splitThenStream(null, "$")
                  .collect(Collectors.joining("|")),
                  is(""));
      }
  
      @Test
      void splitThenStreamSingle() throws Exception {
          assertThat(
                  _Strings.splitThenStream(" 12 aBc ", "$")
                  .collect(Collectors.joining("|")),
                  is(" 12 aBc "));
      }
  
      @Test
      void splitThenStreamMultipleWithSeparatorAtBegin() throws Exception {
          assertThat(
                  _Strings.splitThenStream("$ 1$2 a$Bc ", "$")
                  .collect(Collectors.joining("|")),
                  is("| 1|2 a|Bc "));
      }
  
      @Test
      void splitThenStreamMultipleWithSeparatorAtEnd() throws Exception {
          assertThat(
                  _Strings.splitThenStream(" 1$2 a$Bc $", "$")
                  .collect(Collectors.joining("|")),
                  is(" 1|2 a|Bc |"));
      }
  
      @Test
      void splitThenStreamMultipleWithSeparatorsInSequence() throws Exception {
          assertThat(
                  _Strings.splitThenStream(" 1$2 a$$Bc ", "$")
                  .collect(Collectors.joining("|")),
                  is(" 1|2 a||Bc "));
      }
  
      @Test
      void splitThenStreamWithnewLine() throws Exception {
          assertThat(
                  _Strings.splitThenStream(" 1\n2 a\n\nBc ", "\n")
                  .collect(Collectors.joining("|")),
                  is(" 1|2 a||Bc "));
      }
  
      @Test
      void condenseWhitespacesWithNull() throws Exception {
          assertThat(
                  _Strings.condenseWhitespaces(null,"|"),
                  nullValue());
      }
  
      @Test
      void condenseWhitespaces() throws Exception {
          assertThat(
                  _Strings.condenseWhitespaces("  12 aBc","|"),
                  is("|12|aBc"));
      }
  
      // -- TO BYTE CONVERSION
  
      @Test
      void toByteConvertWithNull() throws Exception {
          assertThat(
                  _Strings.toBytes(null, StandardCharsets.UTF_8),
                  nullValue());
      }
  
      @Test
      void toByteConvertWithEmpty() throws Exception {
          assertArrayEquals(
                  _Constants.emptyBytes,
                  _Strings.toBytes("", StandardCharsets.UTF_8));
      }
  
      @Test
      void toByteConvert() throws Exception {
          assertArrayEquals(
                  new byte[] {48,49,50,51},
                  _Strings.toBytes("0123", StandardCharsets.UTF_8));
      }
  
      // -- FROM BYTE CONVERSION
  
      @Test
      void fromByteConvertWithNull() throws Exception {
          assertThat(
                  _Strings.ofBytes(null, StandardCharsets.UTF_8),
                  nullValue());
      }
  
      @Test
      void fromByteConvertWithEmpty() throws Exception {
          assertThat(
                  _Strings.ofBytes(_Constants.emptyBytes, StandardCharsets.UTF_8),
                  is(""));
      }
  
      @Test
      void fromByteConvert() throws Exception {
          assertThat(
                  _Strings.ofBytes(new byte[] {48,49,50,51}, StandardCharsets.UTF_8),
                  is("0123"));
      }
  
      // -- BYTE MANIPULATION
  
      @Test
      void convertIdentity() throws Exception {
  
          assertThat(
                  _Strings.convert(null, _Bytes.operator(), StandardCharsets.UTF_8),
                  nullValue());
  
          assertThat(
                  _Strings.convert("0123", _Bytes.operator(), StandardCharsets.UTF_8),
                  is("0123"));
      }
  
      // -- OPERATOR COMPOSITION
  
      @Test
      void composeIdentityWithNull() throws Exception {
          assertThat(
                  _Strings.StringOperator.identity().apply(null),
                  nullValue());
      }
  
      @Test
      void composeIdentity() throws Exception {
          assertThat(
                  _Strings.StringOperator.identity().apply(" 12 aBc"),
                  is(" 12 aBc"));
      }
  
      @Test
      void compose2WithNull() throws Exception {
          assertThat(
                  _Strings.StringOperator.identity()
                  .andThen(_Strings::lower)
                  .apply(null),
                  nullValue());
      }
  
      @Test
      void compose2() throws Exception {
          assertThat(
                  _Strings.StringOperator.identity()
                  .andThen(_Strings::lower)
                  .apply(" 12 aBc"),
                  is(" 12 abc"));
      }
  
      @Test
      void composeOperatorSequency_LastShouldWin() throws Exception {
          assertThat(
                  _Strings.StringOperator.identity()
                  .andThen(_Strings::lower)
                  .andThen(_Strings::upper)
                  .apply(" 12 aBc"),
                  is(" 12 ABC"));
      }
  
      // -- BASE64
  
      @ParameterizedTest
      @ValueSource(strings = {
              "-12-abc !@#$%^&*()_-+={}[]<>,./?\\:\"",
              ""})
      void base64UrlZlibCompressedRoundtrip(final String input) throws Exception {
          assertThat(
                  _Strings.base64UrlDecodeZlibCompressed(_Strings.base64UrlEncodeZlibCompressed(input)),
                  is(input));
      }
  
      // -- SPECIAL COMPOSITES
  
      @Test
      void asNormalized() throws Exception {
          assertNull(asNormalized(null)); // null
          assertThat(asNormalized(""), is("")); // empty string
          assertThat(asNormalized("yada Foobar"), is("yada Foobar")); // alreadyNormalized
          assertThat(asNormalized("Yada\tFoobar"), is("Yada Foobar")); // tab
          assertThat(asNormalized("Yada\t Foobar"), is("Yada Foobar")); // tab and space
          assertThat(asNormalized("Yada  foobar"), is("Yada foobar")); // two spaces
          assertThat(asNormalized("Yada\nfoobar"), is("Yada foobar")); // new line
          assertThat(asNormalized("Yada\n Foobar"), is("Yada Foobar")); // newline and space
          assertThat(asNormalized("Yada\r\n Foobar"), is("Yada Foobar")); // windows newline
          assertThat(asNormalized("Yada\r Foobar"), is("Yada Foobar")); // mac-os newline
          assertThat(asNormalized("Yada\r \tFoo \n\tbar  Baz"), is("Yada Foo bar Baz")); // multiple
          assertThat(asNormalized(" 12 a B         c"), is(" 12 a B c"));
      }
      private String asNormalized(final String string) {
          return _Strings.asNormalized.apply(string);
      }
  
      @Test
      void asNaturalName() throws Exception {
          assertThat(asNaturalName("NextAvailableDate"), is("Next Available Date"));
      }
      @Test
      void naturalNameAddsSpacesToCamelCaseWords() {
          assertEquals("Camel Case Word", asNaturalName("CamelCaseWord"));
      }
      @Test
      void naturalNameAddsSpacesBeforeNumbers() {
          assertEquals("One 2 One", asNaturalName("One2One"));
          assertEquals("Type 123", asNaturalName("Type123"));
          assertEquals("4321 Go", asNaturalName("4321Go"));
      }
      @Test
      void naturalNameRecognisesAcronymns() {
          assertEquals("TNT Power", asNaturalName("TNTPower"));
          assertEquals("Spam RAM Can", asNaturalName("SpamRAMCan"));
          assertEquals("DOB", asNaturalName("DOB"));
      }
      @Test
      void naturalNameWithShortNames() {
          assertEquals("At", asNaturalName("At"));
          assertEquals("I", asNaturalName("I"));
      }
      @Test
      void naturalNameNoChange() {
          assertEquals("Camel Case Word", asNaturalName("CamelCaseWord"));
          assertEquals("Almost Normal english sentence", asNaturalName("Almost Normal english sentence"));
      }
      private static String asNaturalName(final String string) {
          return _Strings.asNaturalName.apply(string);
      }
  
      @Test
      void asCamelCase() {
          assertThat(asCamelCase("An Upper Case"), is("AnUpperCase"));
          assertThat(asCamelCase("An_Upper.Case"), is("AnUpperCase"));
          assertThat(asCamelCase("a Lower Case"), is("aLowerCase"));
          assertThat(asCamelCase("a_Lower.Case"), is("aLowerCase"));
          // special use-case in org.apache.causeway.viewer.commons.model.components.UiComponentType#getId()
          assertThat(asCamelCase("OBJECT_EDIT".toLowerCase()), is("objectEdit"));
      }
      private String asCamelCase(final String string) {
          return _Strings.asCamelCase.apply(string);
      }
  
      @Test
      void asCamelCaseDecapitalized() {
          assertThat(asCamelCaseDecapitalized("An Upper Case"), is("anUpperCase"));
          assertThat(asCamelCaseDecapitalized("a Lower Case"), is("aLowerCase"));
          assertThat(asCamelCaseDecapitalized("AnUpperCase"), is("anUpperCase"));
          assertThat(asCamelCaseDecapitalized("aLowerCase"), is("aLowerCase"));
          assertThat(asCamelCaseDecapitalized("a  Lower  Case"), is("aLowerCase"));
      }
      private String asCamelCaseDecapitalized(final String string) {
          return _Strings.asCamelCaseDecapitalized.apply(string);
      }
  
      @Test
      void asLowerDashed() {
          assertThat(asLowerDashed(" 12    aBc"), is("-12-abc"));
          assertThat(asLowerDashed("An Upper Case"), is("an-upper-case"));
          assertThat(asLowerDashed("An   Upper   Case"), is("an-upper-case"));
          assertThat(asLowerDashed("An\nUpper\tCase"), is("an-upper-case"));
      }
      private String asLowerDashed(final String string) {
          return _Strings.asLowerDashed.apply(string);
      }
  
      // -- PREFIX/SUFFIX
  
      @Test
      void shouldStripIfThereIsOne() {
          assertThat(stripLeadingSlash("/foobar"), is("foobar"));
      }
      @Test
      void shouldLeaveUnchangedIfThereIsNone() {
          assertThat(stripLeadingSlash("foobar"), is("foobar"));
      }
      @Test
      void shouldConvertSolitarySlashToEmptyString() {
          assertThat(stripLeadingSlash("/"), is(""));
      }
      @Test
      void identityOnNull() {
          assertNull(stripLeadingSlash(null));
      }
      private static String stripLeadingSlash(final String input) {
          return _Strings.removePrefix(input, "/");
      }
  
  }
  