pqw: restore state through public methods

The importer assigned private attributes of QuestBook, Inventory and
SpellBook. Each now has a restore() method that sets its state
wholesale, and the importer uses those.

pqcli/mechanic.py

@@ -173,6 +173,11 @@ class QuestBook(SignalMixin):
             return self._quests[-1]
         return None
 
+    def restore(self, act: int, quests: list[str]) -> None:
+        """Set the act and quest log wholesale, as when importing a save."""
+        self._act = act
+        self._quests = list(quests)
+
     def increment_act(self) -> None:
         self._act += 1
         self.emit("start_act", self._act)
@@ -210,6 +215,14 @@ class Inventory(SignalMixin):
     def __getitem__(self, idx: int) -> InventoryItem:
         return self._items[idx]
 
+    def restore(self, gold: int, items: list[InventoryItem]) -> None:
+        """Set the gold and items wholesale, as when importing a save.
+
+        The encumbrance bar is left alone, so callers can restore it too.
+        """
+        self._gold = gold
+        self._items = list(items)
+
     def add_gold(self, quantity: int) -> None:
         logger.info(
             "%s %s",
@@ -294,6 +307,10 @@ class SpellBook(SignalMixin):
     def __len__(self) -> int:
         return len(self._spells)
 
+    def restore(self, spells: list[Spell]) -> None:
+        """Set the spells wholesale, as when importing a save."""
+        self._spells = list(spells)
+
     def add(self, spell_name: str, level: int) -> None:
         for spell in self._spells:
             if spell.name == spell_name:

pqcli/pqw.py

@@ -241,8 +241,9 @@ def import_game(
     player.quest_book.plot_bar.reset(*_bar(game, "PlotBar"))
     player.quest_book.quest_bar.reset(*_bar(game, "QuestBar"))
 
-    player.quest_book._act = _int(game, "act")
-    player.quest_book._quests = [str(q) for q in _field(game, "Quests")]
+    player.quest_book.restore(
+        _int(game, "act"), [str(q) for q in _field(game, "Quests")]
+    )
     player.quest_book.monster = _parse_monster(
         str(game.get("questmonster", ""))
     )
@@ -256,13 +257,13 @@ def import_game(
     rows = _field(game, "Inventory")
     if not rows or rows[0][0] != "Gold":
         raise PqwError("field Inventory does not start with Gold")
-    player.inventory._gold = _int(game, "Inventory", 0, 1)
-    player.inventory._items = [
-        InventoryItem(str(row[0]), int(row[1])) for row in rows[1:]
-    ]
+    player.inventory.restore(
+        _int(game, "Inventory", 0, 1),
+        [InventoryItem(str(row[0]), int(row[1])) for row in rows[1:]],
+    )
     player.inventory.encum_bar.reset(*_bar(game, "EncumBar"))
 
-    player.spell_book._spells = _parse_spells(game)
+    player.spell_book.restore(_parse_spells(game))
 
     player.task = _parse_task(game)
     player.queue = [_parse_queue_entry(e) for e in _field(game, "queue")]