Update app.py

app.py

@@ -4,28 +4,25 @@ import requests
 import pandas as pd
 from dotenv import load_dotenv
 from esi_agent import EsiAgent
+import time
+from langchain_core.messages import HumanMessage
 
 # (Keep Constants as is)
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 class BasicAgent:
+    """A langgraph agent."""
     def __init__(self):
-        print("Initializing the BasicAgent")
-        
-        # Get Gemini API key
-        api_key = os.getenv('GOOGLE_API_KEY')
-        if not api_key:
-            raise ValueError("GOOGLE_API_KEY environment variable not set.")
-            
-        # Initialize GeminiAgent
-        self.agent = EsiAgent(api_key=api_key)
-        print("EsiAgent initialized successfully")
+        print("BasicAgent initialized.")
+        self.graph = EsiAgent()
 
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
-        final_answer = self.agent.run(question)
-        print(f"Agent returning fixed answer: {final_answer}")
-        return final_answer
+        # Wrap the question in a HumanMessage from langchain_core
+        messages = [HumanMessage(content=question)]
+        messages = self.graph.invoke({"messages": messages})
+        answer = messages['messages'][-1].content
+        return answer[14:]
 
 def run_and_submit_all( profile: gr.OAuthProfile | None):
     """