/*
    * 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.net.io;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.IOException;
  import java.io.StringReader;
  
  import org.junit.jupiter.api.Test;
  
  class DotTerminatedMessageReaderTest {
  
      private static final String CRLF = "\r\n";
      private static final String DOT = ".";
      private static final String EOM = CRLF + DOT + CRLF;
      private DotTerminatedMessageReader reader;
      private final StringBuilder str = new StringBuilder();
      private final char[] buf = new char[64];
  
      @Test
      void testDoubleCrBeforeDot() throws IOException {
          final String test = "Hello World!\r" + EOM;
          reader = new DotTerminatedMessageReader(new StringReader(test));
  
          int read = 0;
          while ((read = reader.read(buf)) != -1) {
              str.append(buf, 0, read);
          }
  
          assertEquals("Hello World!\r" + CRLF, str.toString());
      }
  
      @Test
      void testEmbeddedDot1() throws IOException {
          final String test = "Hello . World!" + EOM;
          reader = new DotTerminatedMessageReader(new StringReader(test));
  
          int read = 0;
          while ((read = reader.read(buf)) != -1) {
              str.append(buf, 0, read);
          }
  
          assertEquals("Hello . World!" + CRLF, str.toString());
      }
  
      @Test
      void testEmbeddedDot2() throws IOException {
          final String test = "Hello .. World!" + EOM;
          reader = new DotTerminatedMessageReader(new StringReader(test));
  
          int read = 0;
          while ((read = reader.read(buf)) != -1) {
              str.append(buf, 0, read);
          }
  
          assertEquals("Hello .. World!" + CRLF, str.toString());
      }
  
      @Test
      void testEmbeddedDot3() throws IOException {
          final String test = "Hello World." + CRLF + "more" + EOM;
          reader = new DotTerminatedMessageReader(new StringReader(test));
  
          int read = 0;
          while ((read = reader.read(buf)) != -1) {
              str.append(buf, 0, read);
          }
  
          assertEquals("Hello World." + CRLF + "more" + CRLF, str.toString());
      }
  
      @Test
      void testEmbeddedDot4() throws IOException {
          final String test = "Hello World\r.\nmore" + EOM;
          reader = new DotTerminatedMessageReader(new StringReader(test));
  
          int read = 0;
          while ((read = reader.read(buf)) != -1) {
              str.append(buf, 0, read);
          }
  
          assertEquals("Hello World\r.\nmore" + CRLF, str.toString());
      }
 
     @Test
     void testEmbeddedNewlines() throws IOException {
         final String test = "Hello" + CRLF + "World\nA\rB" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         int read = 0;
         while ((read = reader.read(buf)) != -1) {
             str.append(buf, 0, read);
         }
 
         assertEquals("Hello" + CRLF + "World\nA\rB" + CRLF, str.toString());
     }
 
     @Test
     void testLeadingDot() throws IOException {
         final String test = "Hello World!" + CRLF + "..text" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         int read = 0;
         while ((read = reader.read(buf)) != -1) {
             str.append(buf, 0, read);
         }
 
         assertEquals("Hello World!" + CRLF + ".text" + CRLF, str.toString());
     }
 
     @Test
     void testReadLine1() throws Exception {
         final String test = "Hello World" + CRLF + "more" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         String line;
         while ((line = reader.readLine()) != null) {
             str.append(line);
             str.append("#");
         }
 
         assertEquals("Hello World#more#", str.toString());
 
     }
 
     @Test
     void testReadLine2() throws Exception {
         final String test = "Hello World\r.\nmore" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         String line;
         while ((line = reader.readLine()) != null) {
             str.append(line);
             str.append("#");
         }
 
         assertEquals("Hello World\r.\nmore#", str.toString());
 
     }
 
     @Test
     void testReadSimpleStringCrLfLineEnding() throws IOException {
         final String test = "Hello World!" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         int read = 0;
         while ((read = reader.read(buf)) != -1) {
             str.append(buf, 0, read);
         }
 
         assertEquals("Hello World!" + CRLF, str.toString());
     }
 
     @Test
     void testReadSimpleStringLfLineEnding() throws IOException {
         final String test = "Hello World!" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         int read = 0;
         while ((read = reader.read(buf)) != -1) {
             str.append(buf, 0, read);
         }
 
         assertEquals("Hello World!" + CRLF, str.toString());
     }
 
     @Test
     void testSingleDotWithTrailingText() throws IOException {
         final String test = "Hello World!" + CRLF + ".text" + EOM;
         reader = new DotTerminatedMessageReader(new StringReader(test));
 
         int read = 0;
         while ((read = reader.read(buf)) != -1) {
             str.append(buf, 0, read);
         }
 
         assertEquals("Hello World!" + CRLF + ".text" + CRLF, str.toString());
     }
 
 }