spiechern überarbeitet sodass es nun auch "nicht-mathe" uploads korrekt speichert.

math-tutor/backend/app/api/canvas.py

 from __future__ import annotations
 
 import base64
+import os
 import time
 from pathlib import Path
 from typing import Optional
 
-
-import logging
 from app import config
 from fastapi import APIRouter, HTTPException
 from pydantic import BaseModel, Field
@@ -14,7 +13,6 @@ from mpxpy.mathpix_client import MathpixClient
 
 router = APIRouter()
 
-logger = logging.getLogger(__name__)
 
 settings = config.get_mathpix_settings()
 
@@ -57,22 +55,28 @@ def save_canvas(request: CanvasSaveRequest) -> CanvasSaveResponse:
     if not safe_hint:
         safe_hint = "drawing"
 
-    filename = f"{safe_hint}-{timestamp}.png"
-    file_path = drawings_dir / filename
+    base_name = f"{safe_hint}-{timestamp}"
+    img_path = drawings_dir / f"{base_name}.png"
+    txt_path = drawings_dir / f"{base_name}.txt"
 
-    with file_path.open("wb") as handle:
+    with img_path.open("wb") as handle:
         handle.write(raw)
 
     try:
-        image = mathpix_client.image_new(file_path=str(file_path), include_line_data=True)
+        image = mathpix_client.image_new(file_path=str(img_path), include_line_data=True)
         lines = image.lines_json()
-        logger.info("Mathpix lines: %s", lines)
         line_type = lines[0]["type"] if lines else None
         if line_type != "math":
+            nf_img_path = img_path.with_name(f"nf_{img_path.name}")
+            nf_txt_path = txt_path.with_name(f"nf_{txt_path.name}")
+            os.rename(img_path, nf_img_path)
+            nf_txt_path.write_text(
+                lines[0]["text"]
+            )
             return CanvasSaveResponse(
                 status="error",
                 latex=f"Please provide a math-formula, you provided a {line_type}.",
-                saved_as=str(file_path),
+                saved_as=str(nf_img_path),
             )
         mmd = image.mmd()
         conversion = mathpix_client.conversion_new(
@@ -84,8 +88,10 @@ def save_canvas(request: CanvasSaveRequest) -> CanvasSaveResponse:
     except Exception as exc:
         raise HTTPException(status_code=500, detail="mathpix failed") from exc
 
+    txt_path.write_text(latex, encoding="utf-8")
+
     return CanvasSaveResponse(
         status="ok",
         latex=latex,
-        saved_as=str(file_path),
+        saved_as=str(img_path),
     )