#227: resume at the mothership, with the crew the save had

Loading a save fell through to the brand-new-game branch in
PlanetAtmosphereController, which spawns STARTING_SHIP_COUNT interceptors at
the world origin. So resuming stranded the player in empty space with the
wrong ships while their base sat wherever they had left it - thousands of
units away on a charted map.

fleet_position was in the save all along, but nothing ever read it: only
Fleet writes it, as a mirror for payment-range checks.

A resumed run now spawns at get_mothership_position(). That is already the
canonical home - BuildController._check_fleet_wipe rebuilds a wiped fleet
there - so this is the existing answer to "where does the fleet belong",
not a new one. It falls back to the position the save was written at, and
only then to the origin, because a run can have no mothership standing.

resumed_from_save is a one-shot handoff like has_return_position, and is
deliberately NOT saved: it describes this launch, not the run.

Verified by reverting the branch: "resumed at (0.0, -48.0), but the
mothership is at (7400.0, -3100.0)".

One note for whoever writes the next fleet test: asserting a three-ship crew
proves nothing without capacity. Since #219 the fleet holds BASE_FLEET_SIZE
(1) plus one berth per supplied fleet office, so spawn_ships clamps to 1 and
the assertion passes against the wrong number. Case A gives the save two
offices and checks max_fleet_size() first.

176/176 at JOBS=3.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019AJMdB7iuHuLFZM1aBu3GD

tests/test_resume_spawn.gd

@@ -0,0 +1,150 @@
+extends SceneTree
+
+# Forgejo #227: a resumed run comes back at its own mothership.
+#
+# Loading a save used to fall through to the brand-new-game branch in
+# PlanetAtmosphereController, which spawns STARTING_SHIP_COUNT interceptors
+# at the world origin. So a resume stranded the player in empty space with
+# the wrong ships, while their base sat wherever they had left it - which on
+# a charted map is thousands of units away.
+#
+# Covers:
+#   A. resuming puts the fleet at the mothership, not at the origin
+#   B. and crews it with the ships the save actually had
+#   C. with no mothership standing, it falls back to where the save was made
+#   D. a NEW game is untouched - still the starting fleet at the origin
+
+const HOME: Vector2 = Vector2(7400.0, -3100.0)
+const AWAY: Vector2 = Vector2(-5200.0, 900.0)
+
+var game_state: Node
+var scene: Node
+var elapsed: float = 0.0
+var stage: int = 0
+var expected_crew: int = 0
+
+
+func _initialize() -> void:
+	game_state = root.get_node("GameState")
+	SaveGame.clear()
+
+
+func _fresh_state() -> void:
+	game_state.buildings.clear()
+	game_state.extractors.clear()
+	game_state.reset_progression()
+	game_state.reset_new_game()
+	game_state.reset_quests()
+	game_state.intro_active = false
+
+
+func _load_scene() -> void:
+	if scene != null and is_instance_valid(scene):
+		scene.free()
+	scene = load("res://world/Main.tscn").instantiate()
+	root.add_child(scene)
+	current_scene = scene
+
+
+func _process(delta: float) -> bool:
+	elapsed += delta
+	match stage:
+		0:
+			if elapsed < 0.3:
+				return false
+			# A run with a base at HOME and the fleet parked far from it.
+			_fresh_state()
+			game_state.add_building(GameState.BUILDING_MOTHERSHIP, HOME)
+			# Capacity for the crew below. Since #219 the fleet holds
+			# BASE_FLEET_SIZE (1) plus one berth per supplied fleet office,
+			# so a save with three ships flying is a save that had two
+			# offices standing - without them spawn_ships clamps to 1 and
+			# this would assert nothing.
+			game_state.add_building(GameState.BUILDING_FLEET_OFFICE, HOME + Vector2(400.0, 0.0))
+			game_state.add_building(GameState.BUILDING_FLEET_OFFICE, HOME + Vector2(800.0, 0.0))
+			game_state.fleet_vessel_types = PackedStringArray([
+				GameState.VESSEL_INTERCEPTOR, GameState.VESSEL_INTERCEPTOR,
+				GameState.VESSEL_INTERCEPTOR])
+			game_state.fleet_position = AWAY
+			expected_crew = game_state.fleet_vessel_types.size()
+			if game_state.max_fleet_size() < expected_crew:
+				return _fail("the fleet cannot hold %d, so a resumed crew would prove nothing (cap %d)" \
+					% [expected_crew, game_state.max_fleet_size()])
+			if not SaveGame.save(game_state):
+				return _fail("could not write the save this test resumes from")
+			_fresh_state()
+			var result: Dictionary = SaveGame.load_into(game_state)
+			if not bool(result.get("ok", false)):
+				return _fail("the save would not load: %s" % result.get("reason", ""))
+			game_state.resumed_from_save = true
+			_load_scene()
+			elapsed = 0.0
+			stage = 1
+			return false
+		1:
+			if elapsed < 0.6:
+				return false
+			var fleet: Node2D = scene.get_node("Fleet")
+			# --- A. at the mothership, not the origin -------------------
+			var at: Vector2 = fleet.get_centroid()
+			if at.distance_to(HOME) > 400.0:
+				return _fail("resumed at %s, but the mothership is at %s" % [at, HOME])
+			if at.distance_to(Vector2.ZERO) < 400.0:
+				return _fail("resumed at the world origin, which is the new-game behaviour")
+			print("resumed at the mothership (%.0f units from it)" % at.distance_to(HOME))
+
+			# --- B. with the crew the save had --------------------------
+			if fleet.ships.size() != expected_crew:
+				return _fail("resumed with %d ships, the save had %d" \
+					% [fleet.ships.size(), expected_crew])
+			print("resumed with the saved crew of %d" % fleet.ships.size())
+			if game_state.resumed_from_save:
+				return _fail("the resume flag was left raised, so the next scene would re-use it")
+
+			# --- C. no mothership: fall back to where the save was made --
+			_fresh_state()
+			game_state.fleet_vessel_types = PackedStringArray([GameState.VESSEL_INTERCEPTOR])
+			game_state.fleet_position = AWAY
+			game_state.resumed_from_save = true
+			_load_scene()
+			elapsed = 0.0
+			stage = 2
+			return false
+		2:
+			if elapsed < 0.6:
+				return false
+			var fleet2: Node2D = scene.get_node("Fleet")
+			var at2: Vector2 = fleet2.get_centroid()
+			if at2.distance_to(AWAY) > 400.0:
+				return _fail("with no mothership, resumed at %s rather than the saved %s" % [at2, AWAY])
+			print("with no mothership, resumed where the save was written")
+
+			# --- D. a new game is untouched -----------------------------
+			_fresh_state()
+			game_state.resumed_from_save = false
+			_load_scene()
+			elapsed = 0.0
+			stage = 3
+			return false
+		3:
+			if elapsed < 0.6:
+				return false
+			var fleet3: Node2D = scene.get_node("Fleet")
+			if fleet3.get_centroid().distance_to(Vector2.ZERO) > 400.0:
+				return _fail("a new game no longer starts at the origin (%s)" % fleet3.get_centroid())
+			if fleet3.ships.size() != GameState.STARTING_SHIP_COUNT:
+				return _fail("a new game starts with %d ships, expected %d" \
+					% [fleet3.ships.size(), GameState.STARTING_SHIP_COUNT])
+			print("a new game still starts with %d ships at the origin" % fleet3.ships.size())
+
+			SaveGame.clear()
+			print("TEST_RESUME_SPAWN: PASS")
+			quit(0)
+			return true
+	return false
+
+
+func _fail(message: String) -> bool:
+	print("TEST_RESUME_SPAWN: FAIL (%s)" % message)
+	quit(1)
+	return true