/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2014 wcm.io
    * %%
    * Licensed 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.
   * #L%
   */
  package io.wcm.maven.plugins.nodejs.mojo;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.regex.Pattern;
  
  import org.apache.maven.plugin.logging.Log;
  
  /**
   * Logs the output of the nodejs process
   */
  final class NodejsOutputStreamHandler extends Thread {
  
    private static final Pattern ERROR_LOG_PATTERN = Pattern.compile(".*(ERROR|FAILED|ERR|npm error).*");
    private static final Pattern WARNING_LOG_PATTERN = Pattern.compile(".*(warn).*", Pattern.CASE_INSENSITIVE);
  
    private final InputStream inputStream;
    private final Log logger;
  
    NodejsOutputStreamHandler(InputStream inputStream, Log logger) {
      this.inputStream = inputStream;
      this.logger = logger;
    }
  
    @Override
    @SuppressWarnings("PMD.AssignmentInOperand")
    public void run() {
      BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
      String line;
      try {
        while ((line = reader.readLine()) != null) {
          line = formatLine(line);
          if (ERROR_LOG_PATTERN.matcher(line).matches()) {
            logger.error(line);
          }
          else if (WARNING_LOG_PATTERN.matcher(line).matches()) {
            logger.warn(line);
          }
          else {
            logger.info(line);
          }
        }
      }
      catch (IOException ex) {
        logger.error(ex);
      }
    }
  
    /**
     * Format line for maven output
     * @param line Line string
     * @return Formatted line
     */
    private String formatLine(String line) {
      // Remove ANSI VT100  control characters
      String formatted = line.replaceAll("\u001B\\[[\\d;]*[^\\d;]", "");
      return "[nodejs] " + formatted;
    }
  
  }