refactor: Introduce file_to_url function for improved file handling, update file URL generation logic, and enhance chat history management for better integration with the Gradio application.

app.py

@@ -16,6 +16,9 @@ MCP_SERVER_URL = "https://mcp-1st-birthday-auto-deployer.hf.space/gradio_api/mcp
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
 MODEL = "gpt-5-mini"
 
+# Will be set when app launches
+APP_URL = None
+
 
 class MCPClientManager:
     def __init__(self, server_url: str):
@@ -71,7 +74,7 @@ openai_client = OpenAI(api_key=OPENAI_API_KEY)
 SYSTEM_PROMPT = """You are a helpful ML assistant with access to Auto Deployer tools.
 
 IMPORTANT: When calling tools with file_path parameter:
-- If the user uploaded a file, use the provided file URL directly
+- Use the provided file URL directly
 - Pass ONLY the raw URL (e.g., "https://...")
 - Never add prefixes like "Gradio File Input - "
 
@@ -90,11 +93,9 @@ async def chat(message: str, history: list, file_url: str):
     if file_url:
         user_content = f"[Uploaded CSV file URL: {file_url}]\n\n{message}"
 
-    # Build history - handle both old tuple format and new dict format
+    # Build history
     for item in history:
-        if isinstance(item, dict):
-            messages.append({"role": item["role"], "content": item["content"]})
-        elif isinstance(item, (list, tuple)) and len(item) == 2:
+        if isinstance(item, (list, tuple)) and len(item) == 2:
             user_msg, assistant_msg = item
             messages.append({"role": "user", "content": user_msg})
             if assistant_msg:
@@ -165,11 +166,32 @@ async def chat(message: str, history: list, file_url: str):
             yield partial_response
 
 
-def handle_file_upload(file):
-    """Return the file path when uploaded"""
-    if file is None:
+def file_to_url(file_path: str, request: gr.Request) -> str:
+    """Convert local file path to HTTP URL"""
+    if file_path is None or file_path == "":
         return ""
-    return file
+
+    # If already a URL, return as-is
+    if file_path.startswith("http://") or file_path.startswith("https://"):
+        return file_path
+
+    # Get base URL from request or use HF Space URL
+    space_host = os.getenv("SPACE_HOST")  # Set automatically on HF Spaces
+
+    if space_host:
+        base_url = f"https://{space_host}"
+    elif request:
+        # Local development - get from request headers
+        host = request.headers.get("host", "127.0.0.1:7860")
+        scheme = request.headers.get("x-forwarded-proto", "http")
+        base_url = f"{scheme}://{host}"
+    else:
+        base_url = "http://127.0.0.1:7860"
+
+    # Convert file path to URL
+    # Format: {base_url}/file={file_path}
+    http_url = f"{base_url}/file={file_path}"
+    return http_url
 
 
 with gr.Blocks(title="Auto Deployer MCP Client") as demo:
@@ -188,7 +210,7 @@ with gr.Blocks(title="Auto Deployer MCP Client") as demo:
                 type="filepath",
             )
             file_url = gr.Textbox(
-                label="File URL",
+                label="File URL (auto-generated)",
                 placeholder="Upload a file or paste a URL",
                 interactive=True,
             )
@@ -222,7 +244,11 @@ with gr.Blocks(title="Auto Deployer MCP Client") as demo:
     )
 
     # Update file URL when file is uploaded
-    file_input.change(fn=handle_file_upload, inputs=file_input, outputs=file_url)
+    file_input.change(
+        fn=file_to_url,
+        inputs=file_input,
+        outputs=file_url,
+    )
 
     # Chat handlers
     async def respond(message, history, url):