/*
    * 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.extensions.util;
  
  import javax.annotation.Nonnull;
  
  import java.io.IOException;
  import java.io.InterruptedIOException;
  import java.nio.channels.ReadableByteChannel;
  import java.nio.charset.Charset;
  import java.util.Scanner;
  
  import org.apache.maven.surefire.extensions.CloseableDaemonThread;
  import org.apache.maven.surefire.extensions.EventHandler;
  
  /**
   *
   */
  public final class LineConsumerThread extends CloseableDaemonThread {
      private final Charset encoding;
      private final ReadableByteChannel channel;
      private final EventHandler<String> eventHandler;
      private final CountdownCloseable countdownCloseable;
      private volatile boolean disabled;
  
      public LineConsumerThread(
              @Nonnull String threadName,
              @Nonnull ReadableByteChannel channel,
              @Nonnull EventHandler<String> eventHandler,
              @Nonnull CountdownCloseable countdownCloseable) {
          this(threadName, channel, eventHandler, countdownCloseable, Charset.defaultCharset());
      }
  
      public LineConsumerThread(
              @Nonnull String threadName,
              @Nonnull ReadableByteChannel channel,
              @Nonnull EventHandler<String> eventHandler,
              @Nonnull CountdownCloseable countdownCloseable,
              @Nonnull Charset encoding) {
          super(threadName);
          this.channel = channel;
          this.eventHandler = eventHandler;
          this.countdownCloseable = countdownCloseable;
          this.encoding = encoding;
      }
  
      @Override
      public void run() {
          try (Scanner stream = new Scanner(channel, encoding.name());
                  CountdownCloseable c = countdownCloseable; ) {
              boolean isError = false;
              while (stream.hasNextLine()) {
                  try {
                      String line = stream.nextLine();
                      isError |= stream.ioException() != null;
                      if (!isError && !disabled) {
                          eventHandler.handleEvent(line);
                      }
                  } catch (IllegalStateException e) {
                      isError = true;
                  }
              }
          } catch (IOException e) {
              if (e instanceof InterruptedIOException || e.getCause() instanceof InterruptedException) {
                  Thread.currentThread().interrupt();
              }
          } catch (IllegalStateException e) {
              // not needed
          }
      }
  
      public void disable() {
          disabled = true;
      }
  
      @Override
      public void close() throws IOException {
          channel.close();
      }
  }