New time period calculation system, bind it also to the UI

cinnamon-dynamic-wallpaper@TobiZog/5.4/preferences/scripts/cinnamon_pref_handler.py

@@ -0,0 +1,56 @@
+import os, json
+from enums.PreferenceEnums import PrefenceEnums
+
+# Location of the Cinnamon preference file since Cinnamon 5.4
+pref_location = os.path.expanduser("~") + \
+  "/.config/cinnamon/spices/cinnamon-dynamic-wallpaper@TobiZog/cinnamon-dynamic-wallpaper@TobiZog.json"
+
+
+def write_to_preferences(parameter: PrefenceEnums, value: str):
+  """ Write a preference value to the JSON file
+
+  Args:
+      parameter (PrefenceEnums): Name of the parameter
+      value (str): Value to write
+  """
+  with open(pref_location, "r") as pref_file:
+    pref_data = json.load(pref_file)
+
+  if parameter in pref_data:
+    pref_data[parameter]["value"] = value
+  else:
+    pref_data[parameter] = {
+      "type": "entry",
+      "default": "",
+      "description": "",
+      "value": value
+    }
+
+  with open(pref_location, "w") as pref_file:
+    json.dump(pref_data, pref_file, separators=(',', ':'), indent=4)
+
+
+def read_str_from_preferences(parameter: PrefenceEnums) -> str:
+  """ Read a value from the JSON file
+
+  Args:
+      parameter (PrefenceEnums): Name of the parameter to get
+
+  Returns:
+      str: Value of the parameter
+  """
+  with open(pref_location, "r") as pref_file:
+    pref_data = json.load(pref_file)
+
+  if parameter in pref_data:
+    return pref_data[parameter]["value"]
+  else:
+    return ""
+  
+def read_int_from_preferences(parameter: PrefenceEnums) -> int:
+  value = read_str_from_preferences(parameter)
+
+  if value == "":
+    return 0
+  else:
+    return int(value)