refactor(exafs-scan): improve docstring and logmessage

superxas_bec/scans/exafs_scan.py

@@ -65,18 +65,27 @@ class EXAFSScan(ScanBase):
 
     def _check_and_upated_input_arguments(self) -> None:
         """
-        If any of xas_rel_range, n_points, k_step or integ_time is None,
-        this method will compute to a default behaviour for the value.
+        Input parameters for the EXAFS scan must be of the same length for n_points, k_step, integ_time
+        and xas_rel_range (-1). This methods checks for this condition, and calculates the integration time
+        for each point in the scan. If the input parameters are not provided with the correct length,
+        it raises a ValueError which indicates which parameters are not matching.
         """
 
         if not all(
             [
                 len(self.n_points) == len(self.k_step),
                 len(self.n_points) == len(self.integ_time),
-                len(self.n_points) == (len(self.xas_rel_range) - 1),  # carefule -1
+                len(self.n_points) == (len(self.xas_rel_range) - 1),  # careful -1
             ]
         ):
-            raise ValueError("Wrong length for bla")  # TODO add better error handling
+            raise ValueError(
+                f"Input parameters must have matching lengths:\n"
+                f"n_points: {len(self.n_points)}, "
+                f"k_step: {len(self.k_step)}, expected: {len(self.n_points)}, "
+                f"integ_time: {len(self.integ_time)},  expected: {len(self.n_points)}, "
+                f"xas_rel_range: {len(self.xas_rel_range)},  expected: {len(self.n_points)-1} "
+            )
+
         self.integ_time = np.repeat(np.array(self.integ_time), np.array(self.n_points))
 
     def _set_position_offset(self):