Update app.py

app.py

@@ -442,6 +442,51 @@ if st.button("Ask"):
         except Exception as e:
             st.error(f"Follow-up error: {e}")
 
+# --- Paper Upload for Review & Improvement ---
+st.divider()
+st.subheader("📤 Upload Your Paper for Feedback")
+
+uploaded_file = st.file_uploader("Upload your research paper (.pdf or .txt)", type=["pdf", "txt"])
+
+if uploaded_file and st.button("🧠 Analyze and Suggest Improvements"):
+    try:
+        def extract_text_from_file(file):
+            if file.name.endswith(".pdf"):
+                from PyPDF2 import PdfReader
+                reader = PdfReader(file)
+                return "\n".join([page.extract_text() for page in reader.pages if page.extract_text()])
+            elif file.name.endswith(".txt"):
+                return file.read().decode("utf-8")
+            return ""
+
+        paper_text = extract_text_from_file(uploaded_file)
+
+        if not paper_text or len(paper_text.strip()) < 100:
+            st.warning("⚠️ The uploaded paper seems empty or too short to analyze.")
+        else:
+            feedback_prompt = [
+                {"role": "system", "content": "You are an expert academic advisor."},
+                {"role": "user", "content": f"""I have written the following research paper. Please analyze it and provide detailed suggestions on:
+                                                - Areas where the paper is weak or unclear
+                                                - How to improve the novelty or originality
+                                                - Structural improvements or better ways to present arguments
+
+                                            Be honest and constructive. Here's the full text:
+
+                                            \"\"\"{paper_text}\"\"\""""}
+                             ]
+
+            with st.status("🔎 Analyzing your paper..."):
+                improvement_output = ""
+                feedback_box = st.empty()
+                for chunk in call_llm(feedback_prompt, max_tokens=2500):
+                    improvement_output += chunk
+                    feedback_box.markdown(improvement_output, unsafe_allow_html=True)
+
+    except Exception as e:
+        st.error(f"❌ Error while analyzing paper: {e}")
+
+
 # --- Optional: View Chat History ---
 with st.expander("📜 View Full Chat History", expanded=False):
     for msg in st.session_state.chat_history: