/*
    * 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.logging;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.function.Consumer;
  
  public class LoggingOutputStream extends FilterOutputStream {
  
      static final byte[] LINE_SEP = System.lineSeparator().getBytes();
  
      final EolBaos buf;
      final Consumer<String> consumer;
  
      public LoggingOutputStream(Consumer<String> consumer) {
          this(new EolBaos(), consumer);
      }
  
      LoggingOutputStream(EolBaos out, Consumer<String> consumer) {
          super(out);
          this.buf = out;
          this.consumer = consumer;
      }
  
      public PrintStream printStream() {
          return new LoggingPrintStream(this);
      }
  
      @Override
      public void write(int b) throws IOException {
          super.write(b);
          if (buf.isEol()) {
              String line = new String(buf.toByteArray(), 0, buf.size() - LINE_SEP.length);
              ProjectBuildLogAppender.updateMdc();
              consumer.accept(line);
              buf.reset();
          }
      }
  
      public void forceFlush() {
          if (buf.size() > 0) {
              String line = new String(buf.toByteArray(), 0, buf.size());
              ProjectBuildLogAppender.updateMdc();
              consumer.accept(line);
              buf.reset();
          }
      }
  
      static class EolBaos extends ByteArrayOutputStream {
          boolean isEol() {
              if (count >= LINE_SEP.length) {
                  for (int i = 0; i < LINE_SEP.length; i++) {
                      if (buf[count - LINE_SEP.length + i] != LINE_SEP[i]) {
                          return false;
                      }
                  }
                  return true;
              }
              return false;
          }
      }
  
      public static class LoggingPrintStream extends PrintStream {
          public LoggingPrintStream(LoggingOutputStream out) {
              super(out, true);
          }
  
          public void forceFlush() {
              ((LoggingOutputStream) out).forceFlush();
          }
      }
  
      public static void forceFlush(PrintStream ps) {
          if (ps instanceof LoggingPrintStream) {
              ((LoggingPrintStream) ps).forceFlush();
          }
      }
  }