/*
    * 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;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.util.Enumeration;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.Servlet;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.htmlunit.junit.annotation.Alerts;
  import org.htmlunit.util.MimeType;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  import org.openqa.selenium.By;
  import org.openqa.selenium.WebDriver;
  
  /**
   * Tests for {@link History}.
   *
   * @author Ahmed Ashour
   * @author Ronald Brill
   */
  public class HistoryTest extends WebDriverTestCase {
  
      /**
       * Tests going in history {@link History#back()} with {@code POST} request.
       *
       * @throws Exception if an error occurs
       */
      @Test
      public void post() throws Exception {
          final Map<String, Class<? extends Servlet>> servlets = new HashMap<>();
          servlets.put("/post1", Post1Servlet.class);
          servlets.put("/post2", Post2Servlet.class);
          servlets.put("/post3", Post3Servlet.class);
          startWebServer("./", new String[0], servlets);
  
          final WebDriver driver = getWebDriver();
          driver.get(URL_FIRST + "post1");
  
          driver.findElement(By.id("mySubmit")).click();
          if (useRealBrowser()) {
              Thread.sleep(400);
          }
          assertEquals(URL_FIRST + "post2", driver.getCurrentUrl());
          assertTrue(driver.getPageSource().contains("POST"));
          assertTrue(driver.getPageSource().contains("para1=value1"));
  
          driver.findElement(By.linkText("Go to GET")).click();
          if (useRealBrowser()) {
              Thread.sleep(400);
          }
          assertEquals(URL_FIRST + "post3", driver.getCurrentUrl());
          assertTrue(driver.getPageSource().contains("GET"));
  
          driver.navigate().back();
          assertEquals(URL_FIRST + "post2", driver.getCurrentUrl());
          assertTrue(driver.getPageSource().contains("POST"));
          assertTrue(driver.getPageSource().contains("para1=value1"));
      }
  
      /**
       * Tests going in history {@link History#back()} with {@code POST} request.
       *
       * @throws Exception if an error occurs
       */
      @Test
      @Alerts("49")
      // limit varies for IE
      public void historyCache() throws Exception {
          final Map<String, Class<? extends Servlet>> servlets = new HashMap<>();
          final int testDeep = 70;
  
          for (int i = 0; i < testDeep; i++) {
              servlets.put("/post" + i, Post1Servlet.class);
          }
          startWebServer("./", new String[0], servlets);
  
         final WebDriver driver = getWebDriver();
 
         int count = Post1Servlet.Count_;
         for (int i = 0; i < testDeep; i++) {
             driver.get(URL_FIRST + "post" + i);
             assertTrue(driver.getPageSource(), driver.getPageSource().contains("Call: " + (i + count)));
         }
 
         count = Post1Servlet.Count_;
         for (int i = 0; i < testDeep - 1; i++) {
             driver.navigate().back();
             if (!driver.getPageSource().contains("Call: " + (count - i - 2))) {
                 assertEquals(Integer.parseInt(getExpectedAlerts()[0]), i);
                 return;
             }
 
             if (count != Post1Servlet.Count_) {
                 Assertions.fail("Server called for " + i);
                 break;
             }
         }
 
         assertEquals(getExpectedAlerts()[0], "done");
     }
 
     /**
      * Servlet for '/post1'.
      */
     public static class Post1Servlet extends HttpServlet {
         static int Count_ = 0;
 
         /**
          * {@inheritDoc}
          */
         @Override
         protected void doGet(final HttpServletRequest request, final HttpServletResponse response)
             throws ServletException, IOException {
 
             response.setCharacterEncoding(UTF_8.name());
             response.setContentType(MimeType.TEXT_HTML);
             response.getWriter().write(
                     DOCTYPE_HTML
                     + "<html>\n"
                     + "<body>\n"
                     + "  <h1>Call: " + Count_ + "</h1>\n"
                     + "  <form action='post2' method='post'>\n"
                     + "    <input type='hidden' name='para1' value='value1'>\n"
                     + "    <input type='submit' value='Click Me' id='mySubmit'>\n"
                     + "  </form>\n"
                     + "</body>\n"
                     + "</html>\n");
 
             Count_++;
         }
     }
 
     /**
      * Servlet for '/post2'.
      */
     public static class Post2Servlet extends HttpServlet {
 
         /**
          * {@inheritDoc}
          */
         @Override
         protected void doPost(final HttpServletRequest request, final HttpServletResponse response)
             throws ServletException, IOException {
 
             request.setCharacterEncoding(UTF_8.name());
             response.setContentType(MimeType.TEXT_HTML);
             final Writer writer = response.getWriter();
             writer.write("POST<br>\n");
             for (final Enumeration<String> en = request.getParameterNames(); en.hasMoreElements();) {
                 final String key = en.nextElement();
                 writer.write(key + "=" + request.getParameter(key) + "<br>\n");
             }
             writer.write("<a href='post3'>Go to GET</a>\n");
         }
     }
 
     /**
      * Servlet for '/post3'.
      */
     public static class Post3Servlet extends HttpServlet {
 
         /**
          * {@inheritDoc}
          */
         @Override
         protected void doGet(final HttpServletRequest request, final HttpServletResponse response)
                 throws ServletException, IOException {
             request.setCharacterEncoding(UTF_8.name());
             response.setContentType(MimeType.TEXT_HTML);
             final Writer writer = response.getWriter();
             writer.write("GET<br>\n");
         }
     }
 }