Update TerascanLogic.save_dage()

I added a function written by ChatGPT. I have not tested it yet.

src/qudi/logic/terascan_logic.py

@@ -1,4 +1,6 @@
 
+import os
+import re
 import numpy as np
 import time
 from PySide2 import QtCore
@@ -324,22 +326,43 @@ def clear_data(self):
             self._curr_wavelength = 0.0
             self._time_since_last_wl_change = time.perf_counter()
 
-
-    # TODO: Clean this up. I don't like the logic. 
+
     @QtCore.Slot()
     def save_data(self) -> None:
-        ds = TextDataStorage(
-            root_dir=self.save_dir,  # Use the configurable save directory
-            column_formats='.15e'
-        )        
-        array = np.column_stack((
+        """
+        Save self.valid_wavelength_data and self.valid_counts_data to a new
+        8-digit, zero-padded .dat file in self.save_dir, e.g. '00000001.dat'.
+        """
+        # 1) Make sure directory exists
+        os.makedirs(self.save_dir, exist_ok=True)
+
+        # 2) Find existing files of form '########.dat'
+        existing = []
+        for fn in os.listdir(self.save_dir):
+            if re.fullmatch(r'\d{8}\.dat', fn):
+                existing.append(int(fn[:8]))
+        # 3) Determine next index
+        next_idx = max(existing) + 1 if existing else 1
+        filename = f"{next_idx:08d}.dat"
+
+        # 4) Stack wavelength and counts into an N×2 array
+        data = np.vstack([
             self.valid_wavelength_data,
-            self.valid_counts_data,
-            self.ttl_data,
-            self.wavelength_data,
-            self.counts_data,
-        ))
-        ds.save_data(array)
+            self.valid_counts_data
+        ]).T  # shape (N, 2)
+
+        # 5) Instantiate storage and save
+        storage = TextDataStorage(
+            root_dir=self.save_dir,
+            comments='# ',
+            delimiter='\t',
+            file_extension='.dat',
+            column_formats=('.8f', '.15e'),
+            include_global_metadata=False
+        )
+        # save_data returns (file_path, timestamp, (rows, columns))
+        storage.save_data(data, filename=filename)
+
 
 
     def __update_data(self):