/*
    * 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.plugins.war;
  
  import java.io.File;
  import java.io.FileFilter;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.apache.maven.plugin.testing.stubs.ArtifactStub;
  import org.apache.maven.plugins.war.stub.MavenProjectArtifactsStub;
  import org.codehaus.plexus.util.FileUtils;
  
  /**
   * @author Stephane Nicoll
   */
  public abstract class AbstractWarExplodedMojoTest extends AbstractWarMojoTest {
  
      protected WarExplodedMojo mojo;
  
      public void setUp() throws Exception {
          super.setUp();
          mojo = (WarExplodedMojo) lookupMojo("exploded", getPomFile());
      }
  
      /**
       * Returns the pom configuration to use.
       *
       * @return the pom configuration
       */
      protected abstract File getPomFile();
  
      /**
       * Returns the test directory to use.
       *
       * @return the test directory
       */
      protected abstract File getTestDirectory();
  
      /**
       * Configures the exploded mojo for the specified test.
       *
       * If the {@code sourceFiles} parameter is {@code null}, sample JSPs are created by default.
       *
       * @param testId the id of the test
       * @param artifactStubs the dependencies (may be null)
       * @param sourceFiles the source files to create (may be null)
       * @return the webapp directory
       * @throws Exception if an error occurs while configuring the mojo
       */
      protected File setUpMojo(final String testId, ArtifactStub[] artifactStubs, String[] sourceFiles) throws Exception {
          final MavenProjectArtifactsStub project = new MavenProjectArtifactsStub();
          final File webAppDirectory = new File(getTestDirectory(), testId);
  
          // Create the webapp sources
          File webAppSource;
          if (sourceFiles == null) {
              webAppSource = createWebAppSource(testId);
          } else {
              webAppSource = createWebAppSource(testId, false);
              for (String sourceFile : sourceFiles) {
                  File sample = new File(webAppSource, sourceFile);
                  createFile(sample);
              }
          }
  
          final File classesDir = createClassesDir(testId, true);
          final File workDirectory = new File(getTestDirectory(), "/war/work-" + testId);
          createDir(workDirectory);
  
          if (artifactStubs != null) {
              for (ArtifactStub artifactStub : artifactStubs) {
                  project.addArtifact(artifactStub);
              }
          }
  
          configureMojo(mojo, new LinkedList<>(), classesDir, webAppSource, webAppDirectory, project);
          setVariableValueToObject(mojo, "workDirectory", workDirectory);
  
         return webAppDirectory;
     }
 
     /**
      * Configures the exploded mojo for the specified test.
      *
      * @param testId the id of the test
      * @param artifactStubs the dependencies (may be null)
      * @return the webapp directory
      * @throws Exception if an error occurs while configuring the mojo
      */
     protected File setUpMojo(final String testId, ArtifactStub[] artifactStubs) throws Exception {
         return setUpMojo(testId, artifactStubs, null);
     }
 
     /**
      * Cleans up a directory.
      *
      * @param directory the directory to remove
      * @throws IOException if an error occurred while removing the directory
      */
     protected void cleanDirectory(File directory) throws IOException {
         if (directory != null && directory.isDirectory() && directory.exists()) {
             FileUtils.deleteDirectory(directory);
         }
     }
 
     /**
      * Asserts the default content of the war based on the specified webapp directory.
      *
      * @param webAppDirectory the webapp directory
      * @return a list of File objects that have been asserted
      */
     protected List<File> assertDefaultContent(File webAppDirectory) {
         // Validate content of the webapp
         File expectedWebSourceFile = new File(webAppDirectory, "pansit.jsp");
         File expectedWebSource2File = new File(webAppDirectory, "org/web/app/last-exile.jsp");
 
         assertTrue("source file not found: " + expectedWebSourceFile.toString(), expectedWebSourceFile.exists());
         assertTrue("source file not found: " + expectedWebSource2File.toString(), expectedWebSource2File.exists());
 
         final List<File> content = new ArrayList<>();
         content.add(expectedWebSourceFile);
         content.add(expectedWebSource2File);
 
         return content;
     }
 
     /**
      * Asserts the web.xml file of the war based on the specified webapp directory.
      *
      * @param webAppDirectory the webapp directory
      * @return a list with the web.xml File object
      */
     protected List<File> assertWebXml(File webAppDirectory) {
         File expectedWEBXMLFile = new File(webAppDirectory, "WEB-INF/web.xml");
         assertTrue("web xml not found: " + expectedWEBXMLFile.toString(), expectedWEBXMLFile.exists());
 
         final List<File> content = new ArrayList<>();
         content.add(expectedWEBXMLFile);
 
         return content;
     }
 
     /**
      * Asserts custom content of the war based on the specified webapp directory.
      *
      * @param webAppDirectory the webapp directory
      * @param filePaths an array of file paths relative to the webapp directory
      * @param customMessage a custom message if an assertion fails
      * @return a list of File objects that have been inspected
      */
     protected List<File> assertCustomContent(File webAppDirectory, String[] filePaths, String customMessage) {
         final List<File> content = new ArrayList<>();
         for (String filePath : filePaths) {
             final File expectedFile = new File(webAppDirectory, filePath);
             if (customMessage != null) {
                 assertTrue(customMessage + " - " + expectedFile.toString(), expectedFile.exists());
             } else {
                 assertTrue("source file not found: " + expectedFile.toString(), expectedFile.exists());
             }
             content.add(expectedFile);
         }
         return content;
     }
 
     /**
      * Asserts that the webapp contains only the specified files.
      *
      * @param webAppDirectory the webapp directory
      * @param expectedFiles the expected files
      * @param filter an optional filter to ignore some resources
      */
     protected void assertWebAppContent(File webAppDirectory, List<File> expectedFiles, FileFilter filter) {
         final List<File> webAppContent = new ArrayList<>();
         if (filter != null) {
             buildFilesList(webAppDirectory, filter, webAppContent);
         } else {
             buildFilesList(webAppDirectory, new FileFilterImpl(webAppDirectory, null), webAppContent);
         }
 
         // Now we have the files, sort them.
         Collections.sort(expectedFiles);
         Collections.sort(webAppContent);
         assertEquals(
                 "Invalid webapp content, expected " + expectedFiles.size() + "file(s) " + expectedFiles + " but got "
                         + webAppContent.size() + " file(s) " + webAppContent,
                 expectedFiles,
                 webAppContent);
     }
 
     /**
      * Builds the list of files and directories from the specified dir.
      *
      * Note that the filter is not used the usual way. If the filter does not accept the current file, it's not added
      * but yet the subdirectories are added if any.
      *
      * @param dir the base directory
      * @param filter the filter
      * @param content the current content, updated recursively
      */
     private void buildFilesList(final File dir, FileFilter filter, final List<File> content) {
         final File[] files = dir.listFiles();
 
         for (File file : files) {
             // Add the file if the filter is ok with it
             if (filter.accept(file)) {
                 content.add(file);
             }
 
             // Even if the file is not accepted and is a directory, add it
             if (file.isDirectory()) {
                 buildFilesList(file, filter, content);
             }
         }
     }
 
     class FileFilterImpl implements FileFilter {
 
         private final List<String> rejectedFilePaths;
 
         private final int webAppDirIndex;
 
         FileFilterImpl(File webAppDirectory, String[] rejectedFilePaths) {
             if (rejectedFilePaths != null) {
                 this.rejectedFilePaths = Arrays.asList(rejectedFilePaths);
             } else {
                 this.rejectedFilePaths = new ArrayList<>();
             }
             this.webAppDirIndex = webAppDirectory.getAbsolutePath().length() + 1;
         }
 
         public boolean accept(File file) {
             String effectiveRelativePath = buildRelativePath(file);
             return !(rejectedFilePaths.contains(effectiveRelativePath) || file.isDirectory());
         }
 
         private String buildRelativePath(File f) {
             return f.getAbsolutePath().substring(webAppDirIndex);
         }
     }
 }