[chatgpt] Adapt HLI service to support core's LLM-based HLI framework (#21132)

Signed-off-by: Florian Hotze <dev@florianhotze.com>

Author: florian-h05

bundles/org.openhab.binding.chatgpt/README.md

@@ -24,14 +24,22 @@
  */
 @NonNullByDefault
 public class ChatGPTBindingConstants {
-
     private static final String BINDING_ID = "chatgpt";
 
     // List of all Thing Type UIDs
     public static final ThingTypeUID THING_TYPE_ACCOUNT = new ThingTypeUID(BINDING_ID, "account");
 
     // List of all Channel ids
     public static final String CHANNEL_CHAT = "chat";
-
     public static final ChannelTypeUID CHANNEL_TYPE_UID_CHAT = new ChannelTypeUID(BINDING_ID, CHANNEL_CHAT);
+
+    // Default values for configuration parameters
+    public static final String DEFAULT_BASE_URL = "https://api.openai.com/v1";
+    public static final String DEFAULT_MODEL = "gpt-4o-mini";
+    public static final double DEFAULT_TEMPERATURE = 1.0;
+    public static final double DEFAULT_TOP_P = 1.0;
+    public static final int DEFAULT_MAX_TOKENS = 1000;
+    public static final int DEFAULT_MAX_MODEL_TURNS = 10;
+    public static final String DEFAULT_SYSTEM_MESSAGE = "You are a helpful assistant.";
+    public static final int DEFAULT_REQUEST_TIMEOUT = 10;
 }

bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTBindingConstants.java

@@ -22,16 +22,10 @@
  */
 @NonNullByDefault
 public class ChatGPTChannelConfiguration {
-
-    public String model = "gpt-4o-mini";
-
-    public Double temperature = 0.5;
-
-    public Double topP = 1.0;
-
-    public String systemMessage = "";
-
-    public int maxTokens = 500;
-
+    public @Nullable String model;
+    public @Nullable Double temperature;
+    public @Nullable Double topP;
+    public @Nullable Integer maxTokens;
+    public @Nullable String systemMessage;
     public @Nullable Integer requestTimeout;
 }

bundles/org.openhab.binding.chatgpt/src/main/java/org/openhab/binding/chatgpt/internal/ChatGPTChannelConfiguration.java

@@ -12,7 +12,10 @@
  */
 package org.openhab.binding.chatgpt.internal;
 
+import static org.openhab.binding.chatgpt.internal.ChatGPTBindingConstants.*;
+
 import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.eclipse.jdt.annotation.Nullable;
 
 /**
  * The {@link ChatGPTConfiguration} class contains fields mapping thing configuration parameters.
@@ -21,17 +24,17 @@
  */
 @NonNullByDefault
 public class ChatGPTConfiguration {
-
+    // API
+    public String baseUrl = DEFAULT_BASE_URL;
+    // Kept for backward compatibility
+    public @Nullable String apiUrl;
     public String apiKey = "";
-    public String apiUrl = "https://api.openai.com/v1/chat/completions";
-    public String modelUrl = "https://api.openai.com/v1/models";
-    public boolean useSemanticModel = true;
-    public String model = "gpt-4o-mini";
-    public Double temperature = 1.0;
-    public Integer maxTokens = 1000;
-    public Double topP = 1.0;
-    public String systemMessage = "";
-    public Integer keepContext = 2;
-    public Integer contextThreshold = 10000;
-    public Integer requestTimeout = ChatGPTHandler.DEFAULT_REQUEST_TIMEOUT_S;
+    // Connection
+    public Integer requestTimeout = DEFAULT_REQUEST_TIMEOUT;
+    // HLI
+    public String model = DEFAULT_MODEL;
+    public Double temperature = DEFAULT_TEMPERATURE;
+    public Double topP = DEFAULT_TOP_P;
+    public Integer maxTokens = DEFAULT_MAX_TOKENS;
+    public Integer maxModelTurns = DEFAULT_MAX_MODEL_TURNS;
 }