Update app.py

app.py

@@ -1 +1,23 @@
-# Placeholder for app.py (Unified Entrypoint)
+from src.config.env import OPENAI_API_KEY, GOOGLE_API_KEY
+from src.interface.ui import create_interface
+from src.state import build_graph
+from src.chains.qa_chain_openai import build_openai_rag_chain
+from src.chains.qa_chain_gemini import build_gemini_rag_chain
+
+# === Choose your backend model ===
+MODEL = "openai"  # Change to "gemini" to use Google Gemini
+PDF_PATH = "resources/22_studenthandbook-22-23_f2.pdf"
+
+# === Build chain based on chosen model ===
+if MODEL == "openai":
+    rag_chain = build_openai_rag_chain(PDF_PATH)
+elif MODEL == "gemini":
+    rag_chain = build_gemini_rag_chain(PDF_PATH)
+else:
+    raise ValueError("Unsupported MODEL type. Choose 'openai' or 'gemini'.")
+
+# === Build the state graph ===
+app = build_graph(rag_chain)
+
+# === Start the UI ===
+create_interface(app.invoke)