/*
    * Copyright 2012-2025 CodeLibs Project and the Others.
    *
    * 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
    *
    *     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.codelibs.fess.app.web.chat;
  
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.codelibs.fess.Constants;
  import org.codelibs.fess.app.web.base.FessSearchAction;
  import org.codelibs.fess.app.web.base.SearchForm;
  import org.codelibs.fess.app.web.search.SearchAction;
  import org.codelibs.fess.chat.ChatClient;
  import org.codelibs.fess.chat.ChatSessionManager;
  import org.codelibs.fess.entity.SearchRequestParams.SearchRequestType;
  import org.codelibs.fess.util.ComponentUtil;
  import org.codelibs.fess.util.RenderDataUtil;
  import org.lastaflute.web.Execute;
  import org.lastaflute.web.response.HtmlResponse;
  
  import jakarta.annotation.Resource;
  
  /**
   * Action class for the RAG chat page.
   *
   * @author FessProject
   */
  public class ChatAction extends FessSearchAction {
  
      private static final Logger logger = LogManager.getLogger(ChatAction.class);
  
      /**
       * Default constructor.
       */
      public ChatAction() {
          // Default constructor
      }
  
      /** The chat client for handling chat operations. */
      @Resource
      protected ChatClient chatClient;
  
      /** The session manager for managing chat sessions. */
      @Resource
      protected ChatSessionManager chatSessionManager;
  
      /**
       * Displays the chat page.
       *
       * @return the HTML response for the chat page, or redirects to search if chat is not available
       */
      @Execute
      public HtmlResponse index() {
          if (logger.isDebugEnabled()) {
              logger.debug("Chat page requested. Checking availability...");
          }
  
          if (!chatClient.isAvailable()) {
              if (logger.isInfoEnabled()) {
                  logger.info("Redirecting to search page. RAG chat is not available.");
              }
              return redirect(SearchAction.class);
          }
  
          if (logger.isDebugEnabled()) {
              logger.debug("Displaying chat page. chatEnabled=true");
          }
  
          return asHtml(virtualHost(path_Chat_ChatJsp)).useForm(SearchForm.class).renderWith(data -> {
              RenderDataUtil.register(data, "chatEnabled", true);
              RenderDataUtil.register(data, "chatPage", true);
              // Label type items for filter UI
              final List<Map<String, String>> labelTypeItems = labelTypeHelper.getLabelTypeItemList(SearchRequestType.SEARCH,
                      request.getLocale() == null ? Locale.ROOT : request.getLocale());
              RenderDataUtil.register(data, "labelTypeItems", labelTypeItems);
              RenderDataUtil.register(data, "displayLabelTypeItems", labelTypeItems != null && !labelTypeItems.isEmpty());
              // Facet query views for filter UI (file type, timestamp, size)
              RenderDataUtil.register(data, "facetQueryViewList", ComponentUtil.getViewHelper().getFacetQueryViewList());
          });
      }
  
      /**
       * Clears the chat session.
       *
      * @param form the chat form containing the session ID to clear
      * @return the HTML response redirecting to the chat page
      */
     @Execute
     public HtmlResponse clear(final ChatForm form) {
         if (form.sessionId != null) {
             if (logger.isDebugEnabled()) {
                 logger.debug("Clearing chat session. sessionId={}", form.sessionId);
             }
             chatSessionManager.clearSession(form.sessionId, getUserId());
         }
         return redirect(getClass());
     }
 
     /**
      * Returns the user ID for the current session. If the user is authenticated, returns the username;
      * otherwise, returns the guest user code.
      *
      * @return the user ID
      */
     protected String getUserId() {
         final String username = systemHelper.getUsername();
         if (!Constants.GUEST_USER.equals(username)) {
             return username;
         }
         return userInfoHelper.getUserCode();
     }
 
 }