update app

app.py

@@ -3,18 +3,33 @@ import gradio as gr
 import requests
 import pandas as pd
 
+from agent import build_graph
+from langchain_core.messages import HumanMessage
+
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 # --- Basic Agent Definition ---
 class BasicAgent:
-    def __init__(self):
-        print("BasicAgent initialized.")
+    def __init__(self, provider: str = "groq"):
+        print(f"Initializing LangGraph Agent with provider: {provider}")
+        self.graph = build_graph(provider=provider)
+
     def __call__(self, question: str) -> str:
-        print(f"Agent received question (first 50 chars): {question[:50]}...")
-        fixed_answer = "This is a default answer."
-        print(f"Agent returning fixed answer: {fixed_answer}")
-        return fixed_answer
+        print(f"Running LangGraph Agent on question: {question[:50]}...")
+        try:
+            messages = [HumanMessage(content=question)]
+            result = self.graph.invoke({"messages": messages})
+            outputs = result["messages"]
+            for m in reversed(outputs):
+                if m.type == "ai":
+                    print(f"Agent output: {m.content[:100]}")
+                    return m.content
+            return "⚠️ No AI message found in the result."
+        except Exception as e:
+            print(f"LangGraph Agent error: {e}")
+            return f"❌ Error: {str(e)}"
+
 
 def run_and_submit_all(username: str):
     if not username: