ModInstaller: check if mod is already installed

src/leek/mod_installer.py

@@ -29,12 +29,14 @@ class ModInstaller:
                     if config_toml.exists() and config_toml.is_file():
                         # Mod can be extracted as is
                         self.__is_flat = False
+                        self.__check_if_already_installed()
                         return
                 case _:
                     config_toml = path / "config.toml"
                     if config_toml.exists() and config_toml.is_file():
                         # Mod needs to be extracted in a folder
                         self.__is_flat = True
+                        self.__check_if_already_installed()
                         return
 
             # If we ever get here there's either no mod on the archive, or we failed to find it
@@ -56,7 +58,7 @@ class ModInstaller:
 
         game_path: Path = GameFinder.find()
         if self.__is_flat:
-            mod_folder_name: str = self.__archive_path.stem
+            mod_folder_name: str = self.__get_mod_folder_name()
             ZipFile(self.__archive_path).extractall(
                 path=str(game_path / "mods" / mod_folder_name)
             )
@@ -65,6 +67,24 @@ class ModInstaller:
 
         self.__is_installed = True
 
+    def __get_mod_folder_name(self) -> str:
+        mod_folder_name: str
+        if self.__is_flat:
+            mod_folder_name = self.__archive_path.stem
+        else:
+            path: ZipPath = ZipPath(ZipFile(self.__archive_path))
+            things_in_root: list[ZipPath] = list(path.iterdir())
+            mod_folder_name = things_in_root[0].stem
+
+        return mod_folder_name
+
+    def __check_if_already_installed(self) -> None:
+        installed_mod_path: Path = (
+            GameFinder.find() / "mods" / self.__get_mod_folder_name()
+        )
+        if installed_mod_path.exists():
+            self.__is_installed = True
+
 
 class UnsupportedArchiveTypeError(Exception):
     """