From ea3b621fb4fb75bea0e70087ecdb1d121bbfa028 Mon Sep 17 00:00:00 2001
From: = <=>
Date: Mon, 5 Oct 2026 13:37:16 +0200
Subject: [PATCH] Resource system cleanup

---
 src/pacman/ecs/graphics.py  |  5 ++---
 src/pacman/ecs/world.py     | 32 +++++++++++++++++++++++++++++---
 src/pacman/game/__init__.py |  4 ++--
 3 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/src/pacman/ecs/graphics.py b/src/pacman/ecs/graphics.py
index 1ea9c9e..caa3a70 100644
--- a/src/pacman/ecs/graphics.py
+++ b/src/pacman/ecs/graphics.py
@@ -51,11 +51,10 @@ class WindowEvents(Resource):
 
 def init_window(world: World) -> None:
     pygame.init()
-    world.spawn(
-        Window,
+    world.spawn_resource(
         Window(pygame.display.set_mode((1600, 1200)), pygame.time.Clock()),
     )
-    world.spawn(WindowEvents, WindowEvents([]))
+    world.spawn_resource(WindowEvents([]))
 
 
 @dataclass
diff --git a/src/pacman/ecs/world.py b/src/pacman/ecs/world.py
index d663e30..8e4eed0 100644
--- a/src/pacman/ecs/world.py
+++ b/src/pacman/ecs/world.py
@@ -58,8 +58,8 @@ def components_type_iter(
             for sub in get_args(components)
             for e in components_type_iter(sub)
         )
-    elif issubclass(components, Component):
-        yield components
+    elif issubclass(origin_or_cls(components), Component):
+        yield cast(type[Component], components)
     else:
         yield from cast(type[Bundle], components).components_type_iter(
             components
@@ -632,6 +632,11 @@ class Query[Items, Filters = tuple[()]](
             raise Exception("More than one entity matches single query")
         return res
 
+    def single_e(self) -> Items:
+        if (res := self.single()) is None:
+            raise Exception("single_e must contain exactly one matching item")
+        return res
+
 
 class Resource(FromWorld, Component):
     @override
@@ -643,7 +648,14 @@ class Resource(FromWorld, Component):
         query: Callable[[], Query[Self]] = cast(
             Callable[[], Query[Self]], _query.extract_from_world(_query, world)
         )
-        default: Callable[[], Self | None] = cls.extract_default(ty, world)
+        def_cb: Callable[[], Self | None] = cls.extract_default(ty, world)
+
+        def default() -> Self | None:
+            if (val := def_cb()) is None:
+                return
+            world.spawn(cast(type[Self], ty), val)
+            return val
+
         return lambda: (
             res if (res := query().single()) is not None else default()
         )
@@ -734,6 +746,20 @@ class World(FromWorld):
     def spawn[T: Components](self, ty: type[T], comp: T) -> Entity:
         return self.spawn_many(ty, [comp])[0]
 
+    def spawn_resource[T: Component](
+        self, comp: T, ty: type[T] | None = None
+    ) -> Entity:
+        if ty is None:
+            ty = type(comp)
+
+        type Ty = ty  # type: ignore
+
+        def remove(query: Query[Entity, Ty], world: World) -> None:
+            world.remove_many(ty, list(query))
+
+        self.add_raw_system(remove)()
+        return self.spawn(ty, comp)
+
     def spawn_many[T: Components](
         self, ty: type[T], comps: list[T]
     ) -> list[Entity]:
diff --git a/src/pacman/game/__init__.py b/src/pacman/game/__init__.py
index 58c6dbf..5d5c425 100644
--- a/src/pacman/game/__init__.py
+++ b/src/pacman/game/__init__.py
@@ -474,8 +474,8 @@ def update_ghost_anim(
 
 
 def setup_resources(world: World) -> None:
-    world.spawn(Inputs, Inputs(set()))
-    world.spawn(ChaseStatus, ChaseStatus())
+    world.spawn_resource(Inputs(set()))
+    world.spawn_resource(ChaseStatus())
 
 
 def update_inputs(inputs: Inputs, events: WindowEvents) -> None:
-- 
2.53.0