/*
    * 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.maven.surefire.stream;
  
  import javax.annotation.Nonnull;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import java.nio.charset.Charset;
  import java.nio.charset.CharsetEncoder;
  
  import org.apache.maven.surefire.api.booter.MasterProcessCommand;
  import org.apache.maven.surefire.api.stream.AbstractStreamEncoder;
  
  import static org.apache.maven.surefire.api.booter.Constants.DEFAULT_STREAM_ENCODING;
  import static org.apache.maven.surefire.api.booter.Constants.DEFAULT_STREAM_ENCODING_BYTES;
  import static org.apache.maven.surefire.api.booter.Constants.MAGIC_NUMBER_FOR_COMMANDS_BYTES;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.BYE_ACK;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.NOOP;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.RUN_CLASS;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.SHUTDOWN;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.SKIP_SINCE_NEXT_TEST;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.TEST_SET_FINISHED;
  
  public class CommandEncoder extends AbstractStreamEncoder<MasterProcessCommand> implements AutoCloseable {
      private final WritableByteChannel out;
  
      public CommandEncoder(WritableByteChannel out) {
          super(out);
          this.out = out;
      }
  
      public void sendRunClass(String testClassName) throws IOException {
          CharsetEncoder encoder = newCharsetEncoder();
          int bufferMaxLength = estimateBufferLength(RUN_CLASS.getOpcodeLength(), null, encoder, 0, 0, testClassName);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encode(encoder, result, RUN_CLASS, testClassName);
          write(result, true);
      }
  
      public void sendTestSetFinished() throws IOException {
          int bufferMaxLength = estimateBufferLength(TEST_SET_FINISHED.getOpcodeLength(), null, null, 0, 0);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encodeHeader(result, TEST_SET_FINISHED);
          write(result, true);
      }
  
      public void sendSkipSinceNextTest() throws IOException {
          int bufferMaxLength = estimateBufferLength(SKIP_SINCE_NEXT_TEST.getOpcodeLength(), null, null, 0, 0);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encodeHeader(result, SKIP_SINCE_NEXT_TEST);
          write(result, true);
      }
  
      public void sendShutdown(String shutdownData) throws IOException {
          CharsetEncoder encoder = newCharsetEncoder();
          int bufferMaxLength = estimateBufferLength(SHUTDOWN.getOpcodeLength(), null, encoder, 0, 0, shutdownData);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encode(encoder, result, SHUTDOWN, shutdownData);
          write(result, true);
      }
  
      public void sendNoop() throws IOException {
          int bufferMaxLength = estimateBufferLength(NOOP.getOpcodeLength(), null, null, 0, 0);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encodeHeader(result, NOOP);
          write(result, true);
      }
  
      public void sendByeAck() throws IOException {
          int bufferMaxLength = estimateBufferLength(BYE_ACK.getOpcodeLength(), null, null, 0, 0);
          ByteBuffer result = ByteBuffer.allocate(bufferMaxLength);
          encodeHeader(result, BYE_ACK);
          write(result, true);
      }
  
      @Nonnull
      @Override
      protected final byte[] getEncodedMagicNumber() {
          return MAGIC_NUMBER_FOR_COMMANDS_BYTES;
      }
  
     @Nonnull
     @Override
     protected final byte[] enumToByteArray(MasterProcessCommand masterProcessCommand) {
         return masterProcessCommand.getOpcodeBinary();
     }
 
     @Nonnull
     @Override
     protected final byte[] getEncodedCharsetName() {
         return DEFAULT_STREAM_ENCODING_BYTES;
     }
 
     @Nonnull
     @Override
     protected final Charset getCharset() {
         return DEFAULT_STREAM_ENCODING;
     }
 
     @Nonnull
     @Override
     protected final CharsetEncoder newCharsetEncoder() {
         return getCharset().newEncoder();
     }
 
     @Override
     public void close() throws IOException {
         out.close();
     }
 }