/*
    * 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.eclipse.aether.internal.impl;
  
  import java.io.ByteArrayInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.eclipse.aether.internal.test.util.TestFileUtils;
  import org.eclipse.aether.spi.io.FileProcessor.ProgressListener;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  /**
   */
  public class DefaultFileProcessorTest {
  
      private File targetDir;
  
      private DefaultFileProcessor fileProcessor;
  
      @BeforeEach
      void setup() throws IOException {
          targetDir = TestFileUtils.createTempDir(getClass().getSimpleName());
          fileProcessor = new DefaultFileProcessor();
      }
  
      @AfterEach
      void teardown() throws Exception {
          TestFileUtils.deleteFile(targetDir);
          fileProcessor = null;
      }
  
      @Test
      void testCopy() throws IOException {
          String data = "testCopy\nasdf";
          File file = TestFileUtils.createTempFile(data);
          File target = new File(targetDir, "testCopy.txt");
  
          fileProcessor.copy(file, target);
  
          assertEquals(data, TestFileUtils.readString(file));
  
          file.delete();
      }
  
      @Test
      void testOverwrite() throws IOException {
          String data = "testCopy\nasdf";
          File file = TestFileUtils.createTempFile(data);
  
          for (int i = 0; i < 5; i++) {
              File target = new File(targetDir, "testCopy.txt");
              fileProcessor.copy(file, target);
              assertEquals(data, TestFileUtils.readString(file));
          }
  
          file.delete();
      }
  
      @Test
      void testCopyEmptyFile() throws IOException {
          File file = TestFileUtils.createTempFile("");
          File target = new File(targetDir, "testCopyEmptyFile");
          target.delete();
          fileProcessor.copy(file, target);
          assertTrue(target.exists() && target.length() == 0L, "empty file was not copied");
          target.delete();
      }
  
      @Test
      void testProgressingChannel() throws IOException {
          File file = TestFileUtils.createTempFile("test");
          File target = new File(targetDir, "testProgressingChannel");
          target.delete();
          final AtomicInteger progressed = new AtomicInteger();
          ProgressListener listener = new ProgressListener() {
             public void progressed(ByteBuffer buffer) {
                 progressed.addAndGet(buffer.remaining());
             }
         };
         fileProcessor.copy(file, target, listener);
         assertTrue(target.isFile(), "file was not created");
         assertEquals(4L, target.length(), "file was not fully copied");
         assertEquals(4, progressed.intValue(), "listener not called");
         target.delete();
     }
 
     @Test
     void testWrite() throws IOException {
         String data = "testCopy\nasdf";
         File target = new File(targetDir, "testWrite.txt");
 
         fileProcessor.write(target, data);
 
         assertEquals(data, TestFileUtils.readString(target));
 
         target.delete();
     }
 
     /**
      * Used ONLY when FileProcessor present, never otherwise.
      */
     @Test
     void testWriteStream() throws IOException {
         String data = "testCopy\nasdf";
         File target = new File(targetDir, "testWriteStream.txt");
 
         fileProcessor.write(target, new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8)));
 
         assertEquals(data, TestFileUtils.readString(target));
 
         target.delete();
     }
 
     @Test
     void testReadChecksumNonExistentFile() {
         assertThrows(IOException.class, () -> fileProcessor.readChecksum(new File("non existent")));
     }
 
     @Test
     void testReadChecksumEmptyFile() throws IOException {
         File emptyFile = TestFileUtils.createTempFile("");
         String read = fileProcessor.readChecksum(emptyFile);
         assertEquals("", read);
     }
 
     @Test
     void testReadChecksum() throws IOException {
         String checksum = "da39a3ee5e6b4b0d3255bfef95601890afd80709";
         File checksumFile = TestFileUtils.createTempFile(checksum);
         String read = fileProcessor.readChecksum(checksumFile);
         assertEquals(checksum, read);
     }
 
     @Test
     void testReadChecksumWhitespace() throws IOException {
         String checksum = "da39a3ee5e6b4b0d3255bfef95601890afd80709";
         File checksumFile;
         String read;
 
         checksumFile = TestFileUtils.createTempFile("foobar(alg) = " + checksum);
         read = fileProcessor.readChecksum(checksumFile);
         assertEquals(checksum, read);
 
         checksumFile = TestFileUtils.createTempFile(checksum + " foobar");
         read = fileProcessor.readChecksum(checksumFile);
         assertEquals(checksum, read);
     }
 }