They can now answer

TelegramBot/OpenAIAgent.cs

@@ -6,14 +6,16 @@ using OpenAI.Chat;
 
 namespace TelegramBot;
 
-public class OpenAiAgent
-{
+public class OpenAiAgent {
     private ApiKeyCredential apikey;
     private OpenAIClient oaiClient;
     private ChatClient chatClient;
     private HttpClient httpClient;
+    
     private Dictionary<(long, Actor), List<(ChatMessage, int)>> oaiChats = new();
     
+    public int ContextSize { get; set; } = 4096;
+    
     public OpenAiAgent(string baseUrl, string apiKey, string model) {
         OpenAIClientOptions options = new OpenAIClientOptions() {
             Endpoint = new(baseUrl),
@@ -79,8 +81,29 @@ public class OpenAiAgent
         return chat!;
     }
 
-    public string GetChatResponse(long chatId, Actor actor) {
-        return String.Empty;
+    public string GetChatResponse(long chatId, Agent agent) {
+        int currentContextSize = agent.SystemPromptLength;
+        List<ChatMessage> chatHistory = new();
+        chatHistory.Add(new SystemChatMessage(agent.SystemPrompt));
+        
+        //Fetch the chat history from the dictionary trimming to the context size
+        var history = GetChatHistory(chatId, agent.Actor).ToList();
+        history.Reverse();
+        //Add the chat history to the list until the context size is reached
+        foreach (var (message, tokenLenght) in history) {
+            if (currentContextSize + tokenLenght > ContextSize) break;
+            chatHistory.Add(message);
+            currentContextSize += tokenLenght;
+        }
+        //Reverse the chat history to get the correct order
+        chatHistory.Reverse(1, chatHistory.Count - 1);
+        
+        var completion = chatClient.CompleteChat(chatHistory).Value.Content[0].Text;
+
+        //Add the response to the chat history
+        ChatHistoryAppend(agent.Actor, chatId, completion);
+        
+        return completion;
     }
 
     public void AddChatToDictionary(long id) {