Fix PDF file upload and processing

app.py

@@ -196,13 +196,18 @@ async def search_documents(query: str, top_k: int = 5):
         raise HTTPException(status_code=500, detail=str(e))
 
 # Gradio 인터페이스 생성
-def process_file(file):
-    file_path = UPLOAD_DIR / file.name
-    with open(file_path, "wb") as buffer:
-        buffer.write(file.getbuffer())
+def process_file(file_path):
+    """Process the uploaded file and return the summary"""
+    # file_path is already a string path from Gradio's type="filepath"
+    if not file_path or not os.path.exists(file_path):
+        return "파일을 찾을 수 없습니다. 다시 시도해주세요."
     
-    result = process_document(str(file_path))
-    return result["summary"]
+    try:
+        result = process_document(file_path)
+        return result.get("summary", "요약을 생성할 수 없습니다.")
+    except Exception as e:
+        logger.error(f"Error processing file: {str(e)}")
+        return f"파일 처리 중 오류가 발생했습니다: {str(e)}"
 
 def search(query):
     results = vector_store.search(query)
@@ -212,7 +217,11 @@ with gr.Blocks() as demo:
     gr.Markdown("# ParseAI PDF 분석 서비스")
     
     with gr.Tab("PDF 업로드"):
-        file_input = gr.File(type="filepath", file_types=["pdf"])
+        file_input = gr.File(
+            label="PDF 파일을 선택하세요",
+            file_types=[".pdf"],
+            type="filepath"
+        )
         upload_button = gr.Button("업로드")
         summary_output = gr.Textbox(label="요약")