extends SceneTree
## Headless smoke test for Studio simulation harness, playtest transition,
## avatar spawn, and clean edit mode restoration (Task f77bf388e8b4).

var _failures: int = 0
var _checks: int = 0

const StudioSimulationManagerClass = preload("res://scripts/studio/studio_simulation_manager.gd")
const ObjectMotionComponentClass = preload("res://scripts/components/object_motion_component.gd")

func _init() -> void:
	print("--- Running Smoke Test: Studio Simulation Harness & Playtest ---")
	test_playtest_lifecycle()
	test_state_rollback_on_stop()

	if _failures == 0:
		print("--- PASS: All %d studio playtest checks passed! ---" % _checks)
		quit(0)
	else:
		printerr("--- FAIL: %d failures out of %d checks ---" % [_failures, _checks])
		quit(1)


func _check(desc: String, cond: bool) -> void:
	_checks += 1
	if cond:
		print("  ✓ %s" % desc)
	else:
		_failures += 1
		printerr("  ✗ FAIL: %s" % desc)


func _make_mock_core() -> EditorCore:
	var payload := ChunkDataDecoder.ChunkPayload.new()
	var layer := ChunkDataDecoder.TileLayerData.new()
	layer.name = "ground"
	layer.layer_id = 0
	layer.width = 16
	layer.height = 16
	layer.depth = 1
	layer.tiles = PackedInt32Array()
	layer.tiles.resize(16 * 16)
	payload.tile_layers.append(layer)

	var model := ChunkEditorModel.new(payload)
	var catalog := EditorObjectCatalog.new()
	catalog.load_catalog()
	return EditorCore.new(model, catalog)


func test_playtest_lifecycle() -> void:
	print("Testing Simulation transition (Edit -> Play -> Stop)...")
	var core := _make_mock_core()
	var world := Node3D.new()
	root.add_child(world)

	var sim := StudioSimulationManagerClass.new()
	world.add_child(sim)
	sim.setup(core, world)

	_check("Initial state is EDIT mode", sim.is_editing())
	_check("is_playing returns false", not sim.is_playing())

	# Start Play
	sim.start_play(true)
	_check("State transitioned to PLAYING", sim.is_playing())
	_check("Test avatar spawned in world", sim._spawned_avatar != null)

	# Stop Play
	sim.stop_simulation()
	_check("State restored to EDIT mode", sim.is_editing())
	_check("Test avatar despawned cleanly", sim._spawned_avatar == null)

	world.queue_free()


func test_state_rollback_on_stop() -> void:
	print("Testing world object transform snapshot and clean rollback...")
	var core := _make_mock_core()
	var world := Node3D.new()
	root.add_child(world)

	# Place an initial object at (5, 5, 0)
	var obj_id := core.place_object("crate_small", Vector3(5, 5, 0))
	_check("Placed initial crate at (5, 5, 0)", obj_id != "")

	var sim := StudioSimulationManagerClass.new()
	world.add_child(sim)
	sim.setup(core, world)

	# Start Play (takes snapshot of (5, 5, 0))
	sim.start_play(false)

	# Simulate movement during gameplay (e.g. physics push or script motion to (20, 30, 10))
	var obj = core.model.find_object(obj_id)
	obj.position = Vector3(20, 30, 10)
	_check("Object moved during gameplay to (20, 30, 10)", obj.position.is_equal_approx(Vector3(20, 30, 10)))

	# Stop Play -> triggers snapshot rollback
	sim.stop_simulation()

	_check("Object restored exactly to pre-play position (5, 5, 0)",
		obj.position.is_equal_approx(Vector3(5, 5, 0)))

	world.queue_free()