/*
    * 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.io.input;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  class WindowsLineEndingInputStreamTest {
  
      private String roundtripReadByte(final String msg) throws IOException {
          return roundtripReadByte(msg, true);
      }
  
      private String roundtripReadByte(final String msg, final boolean ensure) throws IOException {
          // read(byte[])
          try (WindowsLineEndingInputStream lf = new WindowsLineEndingInputStream(
                  CharSequenceInputStream.builder().setCharSequence(msg).setCharset(StandardCharsets.UTF_8).get(), ensure)) {
              final byte[] buf = new byte[100];
              int i = 0;
              while (i < buf.length) {
                  final int read = lf.read();
                  if (read < 0) {
                      break;
                  }
                  buf[i++] = (byte) read;
              }
              return new String(buf, 0, i, StandardCharsets.UTF_8);
          }
      }
  
      private String roundtripReadByteArray(final String msg) throws IOException {
          return roundtripReadByteArray(msg, true);
      }
  
      private String roundtripReadByteArray(final String msg, final boolean ensure) throws IOException {
          // read(byte[])
          try (WindowsLineEndingInputStream lf = new WindowsLineEndingInputStream(
                  CharSequenceInputStream.builder().setCharSequence(msg).setCharset(StandardCharsets.UTF_8).get(), ensure)) {
              final byte[] buf = new byte[100];
              final int read = lf.read(buf);
              return new String(buf, 0, read, StandardCharsets.UTF_8);
          }
      }
  
      private String roundtripReadByteArrayIndex(final String msg) throws IOException {
          return roundtripReadByteArrayIndex(msg, true);
      }
  
      private String roundtripReadByteArrayIndex(final String msg, final boolean ensure) throws IOException {
          // read(byte[])
          try (WindowsLineEndingInputStream lf = new WindowsLineEndingInputStream(
                  CharSequenceInputStream.builder().setCharSequence(msg).setCharset(StandardCharsets.UTF_8).get(), ensure)) {
              final byte[] buf = new byte[100];
              final int read = lf.read(buf, 0, 100);
              return new String(buf, 0, read, StandardCharsets.UTF_8);
          }
      }
  
      @Test
      void testInTheMiddleOfTheLine_Byte() throws Exception {
          assertEquals("a\r\nbc\r\n", roundtripReadByte("a\r\nbc"));
      }
  
      @Test
      void testInTheMiddleOfTheLine_ByteArray() throws Exception {
          assertEquals("a\r\nbc\r\n", roundtripReadByteArray("a\r\nbc"));
      }
  
      @Test
      void testInTheMiddleOfTheLine_ByteArrayIndex() throws Exception {
          assertEquals("a\r\nbc\r\n", roundtripReadByteArrayIndex("a\r\nbc"));
      }
  
      @Test
      void testLinuxLineFeeds_Byte() throws Exception {
          assertEquals("ab\r\nc", roundtripReadByte("ab\nc", false));
      }
 
     @Test
     void testLinuxLineFeeds_ByteArray() throws Exception {
         assertEquals("ab\r\nc", roundtripReadByteArray("ab\nc", false));
     }
 
     @Test
     void testLinuxLineFeeds_ByteArrayIndex() throws Exception {
         assertEquals("ab\r\nc", roundtripReadByteArrayIndex("ab\nc", false));
     }
 
     @Test
     void testMalformed_Byte() throws Exception {
         assertEquals("a\rbc", roundtripReadByte("a\rbc", false));
     }
 
     @Test
     void testMalformed_ByteArray() throws Exception {
         assertEquals("a\rbc", roundtripReadByteArray("a\rbc", false));
     }
 
     @Test
     void testMalformed_ByteArrayIndex() throws Exception {
         assertEquals("a\rbc", roundtripReadByteArrayIndex("a\rbc", false));
     }
 
     @ParameterizedTest
     @ValueSource(booleans = { false, true })
     void testMark(final boolean ensureLineFeedAtEndOfFile) {
         assertThrows(UnsupportedOperationException.class, () -> new WindowsLineEndingInputStream(new NullInputStream(), true).mark(1));
     }
 
     @SuppressWarnings("resource")
     @ParameterizedTest
     @ValueSource(booleans = { false, true })
     void testMarkSupported(final boolean ensureLineFeedAtEndOfFile) {
         assertFalse(new WindowsLineEndingInputStream(new NullInputStream(), true).markSupported());
     }
 
     @Test
     void testMultipleBlankLines_Byte() throws Exception {
         assertEquals("a\r\n\r\nbc\r\n", roundtripReadByte("a\r\n\r\nbc"));
     }
 
     @Test
     void testMultipleBlankLines_ByteArray() throws Exception {
         assertEquals("a\r\n\r\nbc\r\n", roundtripReadByteArray("a\r\n\r\nbc"));
     }
 
     @Test
     void testMultipleBlankLines_ByteArrayIndex() throws Exception {
         assertEquals("a\r\n\r\nbc\r\n", roundtripReadByteArrayIndex("a\r\n\r\nbc"));
     }
 
     @Test
     void testRetainLineFeed_Byte() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByte("a\r\n\r\n", false));
         assertEquals("a", roundtripReadByte("a", false));
     }
 
     @Test
     void testRetainLineFeed_ByteArray() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByteArray("a\r\n\r\n", false));
         assertEquals("a", roundtripReadByteArray("a", false));
     }
 
     @Test
     void testRetainLineFeed_ByteArrayIndex() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByteArray("a\r\n\r\n", false));
         assertEquals("a", roundtripReadByteArrayIndex("a", false));
     }
 
     @Test
     void testSimpleString_Byte() throws Exception {
         assertEquals("abc\r\n", roundtripReadByte("abc"));
     }
 
     @Test
     void testSimpleString_ByteArray() throws Exception {
         assertEquals("abc\r\n", roundtripReadByteArray("abc"));
     }
 
     @Test
     void testSimpleString_ByteArrayIndex() throws Exception {
         assertEquals("abc\r\n", roundtripReadByteArrayIndex("abc"));
     }
 
     @Test
     void testTwoLinesAtEnd_Byte() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByte("a\r\n\r\n"));
     }
 
     @Test
     void testTwoLinesAtEnd_ByteArray() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByteArray("a\r\n\r\n"));
     }
 
     @Test
     void testTwoLinesAtEnd_ByteArrayIndex() throws Exception {
         assertEquals("a\r\n\r\n", roundtripReadByteArrayIndex("a\r\n\r\n"));
     }
 }