/*
    * SPDX-FileCopyrightText: Copyright (c) 2011-2026 Yegor Bugayenko
    * SPDX-License-Identifier: MIT
    */
   package com.qulice.maven;
   
   import com.jcabi.xml.XML;
   import com.jcabi.xml.XMLDocument;
   import com.qulice.spi.Environment;
  import com.qulice.spi.ValidationException;
  import java.io.File;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import org.apache.commons.io.FileUtils;
  
  /**
   * Check pom.xml with XPath validation queries.
   *
   * <p>Restrictions:
   *
   * <ol>
   * <li>Each xpath component should contains namespace prefix pom:</li>
   * <li>Each xpath query should end with /text()</li>
   * </ol>
   *
   * @since 0.6
   */
  public final class PomXpathValidator implements MavenValidator {
  
      /**
       * Default constructor.
       */
      public PomXpathValidator() {
          // nothing to initialize
      }
  
      @Override
      public void validate(final MavenEnvironment env)
          throws ValidationException {
          PomXpathValidator.validate(PomXpathValidator.pom(env), env.asserts());
      }
  
      /**
       * Validate pom against xpath queries.
       * @param pom POM
       * @param xpaths Xpath queries
       * @throws ValidationException validation exception
       */
      private static void validate(final XML pom, final Iterable<String> xpaths)
          throws ValidationException {
          for (final String xpath : xpaths) {
              if (pom.xpath(xpath).isEmpty()) {
                  throw new ValidationException(
                      String.format(
                          "pom.xml don't match the xpath query [%s]", xpath
                      )
                  );
              }
          }
      }
  
      /**
       * Parse pom.xml.
       * @param env Environment
       * @return XML instance
       */
      private static XML pom(final Environment env) {
          try {
              return new XMLDocument(
                  FileUtils.readFileToString(
                      new File(
                          String.format(
                              "%s%s%s",
                              env.basedir(),
                              File.separator,
                              "pom.xml"
                          )
                      ),
                      StandardCharsets.UTF_8
                  )
              ).registerNs("pom", "http://maven.apache.org/POM/4.0.0");
          } catch (final IOException exc) {
              throw new IllegalArgumentException(exc);
          }
      }
  }