content: /*
   *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
   *  <p>
   *  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
   *  <p>
   *  http://www.apache.org/licenses/LICENSE-2.0
   *  <p>
   *  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 com.agentsflex.llm.chatglm;
  
  import com.agentsflex.core.llm.ChatOptions;
  import com.agentsflex.core.message.HumanMessage;
  import com.agentsflex.core.message.Message;
  import com.agentsflex.core.message.MessageStatus;
  import com.agentsflex.core.parser.AiMessageParser;
  import com.agentsflex.core.parser.impl.DefaultAiMessageParser;
  import com.agentsflex.core.prompt.DefaultPromptFormat;
  import com.agentsflex.core.prompt.Prompt;
  import com.agentsflex.core.prompt.PromptFormat;
  import com.agentsflex.core.util.Maps;
  import com.agentsflex.core.util.MessageUtil;
  import com.alibaba.fastjson.JSON;
  import io.jsonwebtoken.JwtBuilder;
  import io.jsonwebtoken.Jwts;
  import io.jsonwebtoken.security.MacAlgorithm;
  
  import javax.crypto.SecretKey;
  import javax.crypto.spec.SecretKeySpec;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  public class ChatglmLlmUtil {
  
      private static final PromptFormat promptFormat = new DefaultPromptFormat();
  
      private static final String id = "HS256";
      private static final String jcaName = "HmacSHA256";
      private static final MacAlgorithm macAlgorithm;
  
      static {
          try {
              //create a custom MacAlgorithm with a custom minKeyBitLength
              int minKeyBitLength = 128;
              Class<?> c = Class.forName("io.jsonwebtoken.impl.security.DefaultMacAlgorithm");
              Constructor<?> ctor = c.getDeclaredConstructor(String.class, String.class, int.class);
              ctor.setAccessible(true);
              macAlgorithm = (MacAlgorithm) ctor.newInstance(id, jcaName, minKeyBitLength);
          } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException | IllegalAccessException |
                   InvocationTargetException e) {
              throw new RuntimeException(e);
          }
      }
  
  
      public static String createAuthorizationToken(ChatglmLlmConfig config) {
          Map<String, Object> headers = new HashMap<>();
          headers.put("alg", "HS256");
          headers.put("sign_type", "SIGN");
  
          long nowMillis = System.currentTimeMillis();
          String[] idAndSecret = config.getApiKey().split("\\.");
  
          Map<String, Object> payloadMap = new HashMap<>();
          payloadMap.put("api_key", idAndSecret[0]);
          payloadMap.put("exp", nowMillis + 3600000);
          payloadMap.put("timestamp", nowMillis);
          String payloadJsonString = JSON.toJSONString(payloadMap);
  
          byte[] bytes = idAndSecret[1].getBytes();
          SecretKey secretKey = new SecretKeySpec(bytes, jcaName);
  
          JwtBuilder builder = Jwts.builder()
              .content(payloadJsonString)
              .header().add(headers).and()
              .signWith(secretKey, macAlgorithm);
          return builder.compact();
      }
  
      public static AiMessageParser getAiMessageParser(boolean isStream) {
          return DefaultAiMessageParser.getChatGPTMessageParser(isStream);
      }
  
  
      public static String promptToPayload(Prompt prompt, ChatglmLlmConfig config, boolean withStream, ChatOptions options) {
          List<Message> messages = prompt.toMessages();
          HumanMessage message = MessageUtil.findLastHumanMessage(messages);
          return Maps.of("model", Optional.ofNullable(options.getModel()).orElse(config.getModel()))
              .set("messages", promptFormat.toMessagesJsonObject(messages))
              .setIf(withStream, "stream", true)
              .setIfNotEmpty("tools", promptFormat.toFunctionsJsonObject(message))
              .setIfContainsKey("tools", "tool_choice", MessageUtil.getToolChoice(message))
              .setIfNotNull("top_p", options.getTopP())
              .setIfNotEmpty("stop", options.getStop())
              .setIf(map -> !map.containsKey("tools") && options.getTemperature() > 0, "temperature", options.getTemperature())
              .setIf(map -> !map.containsKey("tools") && options.getMaxTokens() != null, "max_tokens", options.getMaxTokens())
              .setIfNotEmpty(options.getExtra())
              .toJSON();
      }
  
  
      public static MessageStatus parseMessageStatus(String status) {
          return "stop".equals(status) ? MessageStatus.END : MessageStatus.MIDDLE;
      }
  
  
  }
  