/*
    * Copyright (c) 2002-2025 Gargoyle Software Inc.
    *
    * Licensed 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.htmlunit.html.parser;
  
  import static java.nio.charset.StandardCharsets.ISO_8859_1;
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.IOException;
  import java.io.OutputStreamWriter;
  import java.io.Writer;
  import java.nio.charset.Charset;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.Servlet;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.htmlunit.WebClient;
  import org.htmlunit.WebServerTestCase;
  import org.htmlunit.html.HtmlPage;
  import org.htmlunit.junit.BrowserRunner;
  import org.htmlunit.util.MimeType;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /**
   * Test class for {@link HTMLParser}.
   *
   * @author <a href="mailto:cse@dynabean.de">Christian Sell</a>
   * @author Marc Guillemot
   * @author Ahmed Ashour
   * @author Sudhan Moghe
   */
  @RunWith(BrowserRunner.class)
  public class HTMLParser3Test extends WebServerTestCase {
  
      /**
       * @throws Exception if the test fails
       */
      @Test
      public void headerVsMetaTagContentType_both() throws Exception {
          HeaderVsMetaTagContentTypeServlet.setEncoding(UTF_8, ISO_8859_1);
          headerVsMetaTagContentType(true);
      }
  
      /**
       * @throws Exception if the test fails
       */
      @Test
      public void headerVsMetaTagContentType_bothReversed() throws Exception {
          HeaderVsMetaTagContentTypeServlet.setEncoding(ISO_8859_1, UTF_8);
          headerVsMetaTagContentType(false);
      }
  
      /**
       * @throws Exception if the test fails
       */
      @Test
      public void headerVsMetaTagContentType4_headerOnly() throws Exception {
          HeaderVsMetaTagContentTypeServlet.setEncoding(UTF_8, null);
          headerVsMetaTagContentType(true);
      }
  
      /**
       * @throws Exception if the test fails
       */
      @Test
      public void headerVsMetaTagContentType_metaOnly() throws Exception {
          HeaderVsMetaTagContentTypeServlet.setEncoding(null, UTF_8);
          headerVsMetaTagContentType(true);
      }
  
      private void headerVsMetaTagContentType(final boolean utf8Encoded) throws Exception {
          final Map<String, Class<? extends Servlet>> servlets = new HashMap<>();
          servlets.put("/test", HeaderVsMetaTagContentTypeServlet.class);
          startWebServer("./", null, servlets);
  
          final WebClient client = getWebClient();
          final HtmlPage page = client.getPage(URL_FIRST + "test");
          assertEquals(utf8Encoded, HeaderVsMetaTagContentTypeServlet.UTF8_STRING.equals(page.asNormalizedText()));
      }
  
      /**
       * Servlet for headerVsMetaTagContentType(boolean).
       */
     public static class HeaderVsMetaTagContentTypeServlet extends HttpServlet {
         private static final String UTF8_STRING = "\u064A\u0627 \u0644\u064A\u064A\u064A\u064A\u0644";
         private static Charset HEADER_ENCODING_;
         private static Charset META_TAG_ENCODING_;
 
         private static void setEncoding(final Charset headerEncoding, final Charset metaTagEncoding) {
             HEADER_ENCODING_ = headerEncoding;
             META_TAG_ENCODING_ = metaTagEncoding;
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws IOException {
             response.setContentType(MimeType.TEXT_HTML);
             if (HEADER_ENCODING_ != null) {
                 response.setCharacterEncoding(HEADER_ENCODING_.name());
             }
             try (Writer writer = new OutputStreamWriter(response.getOutputStream(), UTF_8)) {
                 String html = "<html><head>";
                 if (META_TAG_ENCODING_ != null) {
                     html += "<META HTTP-EQUIV='Content-Type' CONTENT='text/html; charset=" + META_TAG_ENCODING_ + "'>";
                 }
                 html += "</head><body>" + UTF8_STRING + "</body></html>";
                 writer.write(html);
             }
         }
     }
 
 }