/*
    * 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.myfaces.tobago.component;
  
  import org.apache.myfaces.tobago.internal.util.StringUtils;
  import org.junit.jupiter.api.BeforeEach;
  
  import javax.faces.component.UIComponent;
  import java.io.File;
  import java.io.IOException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.List;
  
  public class AbstractGeneratedUIComponentsUnitTest {
  
    private List<Class<? extends UIComponent>> uiComponents;
  
    protected List<Class<? extends UIComponent>> getUiComponents() {
      return uiComponents;
    }
  
    @BeforeEach
    public void setup() throws IOException, ClassNotFoundException {
      uiComponents = findUIComponents();
    }
  
    /**
     * Find all classes in a package
     */
    private List<Class<? extends UIComponent>> findUIComponents() throws ClassNotFoundException, IOException {
      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
      final String packageName = this.getClass().getPackage().getName();
      final String path = packageName.replace('.', '/');
      final Enumeration<URL> resources = classLoader.getResources(path);
      final List<File> directories = new ArrayList<>();
      while (resources.hasMoreElements()) {
        final URL resource = resources.nextElement();
        directories.add(new File(resource.getFile()));
      }
      final ArrayList<Class<? extends UIComponent>> result = new ArrayList<>();
      for (final File directory : directories) {
        final File[] files = directory.listFiles();
        if (files != null) {
          for (final File file : files) {
            final String name = file.getName();
            if (!StringUtils.endsWith(name, ".class")) {
              continue;
            }
            final String nameWithoutSuffix = name.substring(0, name.length() - 6);
            final String className = packageName + '.' + nameWithoutSuffix;
            final Class<? extends UIComponent> clazz = (Class<? extends UIComponent>) Class.forName(className);
            if (UIComponent.class.isAssignableFrom(clazz)) {
              result.add(clazz);
            }
          }
        }
      }
      return result;
    }
  
  }