/**
 * 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.ambari.view;

import org.junit.Test;

import javax.xml.XMLConstants;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import java.io.File;
import java.util.LinkedList;
import java.util.List;

/**
 * view.xml related tests.
 */
public class ViewXmlTest {

  @Test
  public void testValidateViewXmls() throws Exception {

    List<File> viewXmlFiles = new LinkedList<File>();

    File ambariViewsDir = new File("."); //ambari-views
    File xsdFile        = new File("./target/classes/view.xsd");

    // validate each of the view.xml files under ambari-views
    for (File file : getViewXmlFiles(viewXmlFiles, ambariViewsDir.listFiles())) {
      validateViewXml(file, xsdFile);
    }
  }

  private List<File> getViewXmlFiles(List<File> viewXmlFiles, File[] files) throws Exception{

    if (files != null) {
      for (File file : files) {
        if (file.isDirectory()) {
          getViewXmlFiles(viewXmlFiles, file.listFiles());
        } else {
          String absolutePath = file.getAbsolutePath();

          if (absolutePath.endsWith("/src/main/resources/view.xml")) {
            viewXmlFiles.add(file);
          }
        }
      }
    }
    return viewXmlFiles;
  }

  private void validateViewXml(File xmlFile, File xsdFile) throws Exception {
    SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

    Schema schema = schemaFactory.newSchema(xsdFile);

    schema.newValidator().validate(new StreamSource(xmlFile));
  }
}