/*
    * 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
    *
   *   https://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.commons.exec;
  
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Path;
  import java.time.Duration;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.commons.lang3.concurrent.BasicThreadFactory;
  import org.junit.jupiter.api.Test;
  
  /**
   * An example based on the tutorial where the user can safely play with
   * <ul>
   * <li>blocking or non-blocking print jobs
   * <li>with print job timeouts to trigger the {@code ExecuteWatchdog}
   * <li>with the {@code exitValue} returned from the print script
   * </ul>
   */
  class TutorialTest {
  
      private final class PrintResultHandler extends DefaultExecuteResultHandler {
  
          private ExecuteWatchdog watchdog;
  
          private PrintResultHandler(final ExecuteWatchdog watchdog) {
              this.watchdog = watchdog;
          }
  
          private PrintResultHandler(final int exitValue) {
              super.onProcessComplete(exitValue);
          }
  
          @Override
          public void onProcessComplete(final int exitValue) {
              super.onProcessComplete(exitValue);
              System.out.println("[resultHandler] The document was successfully printed ...");
          }
  
          @Override
          public void onProcessFailed(final ExecuteException e) {
              super.onProcessFailed(e);
              if (watchdog != null && watchdog.killedProcess()) {
                  System.err.println("[resultHandler] The print process timed out");
              } else {
                  System.err.println("[resultHandler] The print process failed to do : " + e.getMessage());
              }
          }
      }
  
      /** The directory to pick up the test scripts */
      private final File testDir = new File("src/test/scripts");
  
      /** Simulates a PDF print job */
      private final Path acroRd32Script = TestUtil.resolveScriptPathForOS(testDir + "/acrord32");
  
      /**
       * Simulate printing a PDF document.
       *
       * @param file              the file to print
       * @param printJobTimeout   the printJobTimeout (ms) before the watchdog terminates the print process
       * @param printInBackground printing done in the background or blocking
       * @return a print result handler (implementing a future)
       * @throws IOException the test failed
       */
      public PrintResultHandler print(final File file, final Duration printJobTimeout, final boolean printInBackground) throws IOException {
  
          int exitValue;
          ExecuteWatchdog watchdog = null;
          PrintResultHandler resultHandler;
  
          // build up the command line to using a 'java.io.File'
          final Map<String, File> map = new HashMap<>();
          map.put("file", file);
          final CommandLine commandLine = new CommandLine(acroRd32Script);
          commandLine.addArgument("/p");
          commandLine.addArgument("/h");
         commandLine.addArgument("${file}");
         commandLine.setSubstitutionMap(map);
 
         // create the executor and consider the exitValue '1' as success
         final Executor executor = DefaultExecutor.builder().get();
         executor.setExitValue(1);
 
         // create a watchdog if requested
         if (printJobTimeout.toMillis() > 0) {
             // @formatter:off
             watchdog = ExecuteWatchdog.builder()
                     .setTimeout(printJobTimeout)
                     .setThreadFactory(new BasicThreadFactory.Builder().build())
                     .get();
             // @formatter:on
             executor.setWatchdog(watchdog);
         }
 
         // pass a "ExecuteResultHandler" when doing background printing
         if (printInBackground) {
             System.out.println("[print] Executing non-blocking print job  ...");
             resultHandler = new PrintResultHandler(watchdog);
             executor.execute(commandLine, resultHandler);
         } else {
             System.out.println("[print] Executing blocking print job  ...");
             exitValue = executor.execute(commandLine);
             resultHandler = new PrintResultHandler(exitValue);
         }
 
         return resultHandler;
     }
 
     @Test
     void testTutorialExample() throws Exception {
 
         final Duration printJobTimeout = Duration.ofSeconds(15);
         final boolean printInBackground = false;
         final File pdfFile = new File("/Documents and Settings/foo.pdf");
 
         PrintResultHandler printResult;
 
         try {
             // printing takes around 10 seconds
             System.out.println("[main] Preparing print job ...");
             printResult = print(pdfFile, printJobTimeout, printInBackground);
             System.out.println("[main] Successfully sent the print job ...");
         } catch (final Exception e) {
             e.printStackTrace();
             fail("[main] Printing of the following document failed : " + pdfFile.getAbsolutePath());
             throw e;
         }
 
         // come back to check the print result
         System.out.println("[main] Test is exiting but waiting for the print job to finish...");
         printResult.waitFor();
         System.out.println("[main] The print job has finished ...");
     }
 }