extends SceneTree

const VerticalSliceRoot = preload(
	"res://game/composition/vertical_slice/vertical_slice_root.gd"
)
const MainMenuScreen = preload("res://game/presentation/main_menu/main_menu_screen.gd")
const CockpitHud = preload("res://game/presentation/cockpit/cockpit_hud.gd")
const CockpitDetailing = preload(
	"res://game/presentation/cockpit/cockpit_detailing.gd"
)
const CockpitPressureBulkhead = preload(
	"res://game/presentation/cockpit/cockpit_pressure_bulkhead.gd"
)
const PauseMenu = preload("res://game/presentation/pause/pause_menu.gd")
const ControlsSettingsScreen = preload(
	"res://game/presentation/settings/controls_settings_screen.gd"
)
const ProductionInputAdapter = preload(
	"res://game/infrastructure/input/production_input_adapter.gd"
)

const TEST_COUNT := 64

var _failures: Array[String] = []


func _init() -> void:
	_run.call_deferred()


func _run() -> void:
	change_scene_to_file(
		"res://game/composition/vertical_slice/vertical_slice_root.tscn"
	)
	await process_frame
	await physics_frame

	var composition := current_scene as VerticalSliceRoot
	_expect(composition != null, "production composition loads")
	if composition != null:
		await _test_vehicle_slice(composition)

	_expect(
		int(ProjectSettings.get_setting("physics/common/physics_ticks_per_second")) == 60,
		"project physics runs at 60 Hz"
	)
	var project_features: PackedStringArray = ProjectSettings.get_setting(
		"application/config/features"
	)
	_expect("Forward Plus" in project_features, "production project uses Forward+")

	var exit_code := 0
	if _failures.is_empty():
		print("Vertical slice foundation integration: %d passed, 0 failed." % TEST_COUNT)
	else:
		for failure: String in _failures:
			push_error(failure)
		print("Vertical slice foundation integration: %d failed." % _failures.size())
		exit_code = 1

	Input.action_release(ProductionInputAdapter.ACTION_FORWARD)
	Input.action_release(ProductionInputAdapter.ACTION_RIGHT)
	if current_scene != null:
		current_scene.queue_free()
	await process_frame
	await process_frame
	quit(exit_code)


func _test_vehicle_slice(composition: VerticalSliceRoot) -> void:
	var menu := composition.active_screen() as MainMenuScreen
	_expect(menu != null, "composition starts on main menu")
	if menu == null:
		return
	var continue_button := menu.get_node("%ContinueButton") as Button
	_expect(continue_button.disabled, "continue is disabled without save")
	var new_game_button := menu.get_node("%NewGameButton") as Button
	new_game_button.pressed.emit()
	await process_frame
	await physics_frame

	var actor = composition.submarine_actor()
	var camera = composition.camera_controller()
	var instruments = composition.cockpit_instrument_panel()
	var detailing: CockpitDetailing = (
		instruments.detailing() if instruments != null else null
	)
	var pressure_bulkhead := (
		instruments.get_node_or_null("%CurvedPressureBulkhead") as CockpitPressureBulkhead
		if instruments != null
		else null
	)
	var analog_gauges := (
		instruments.get_node_or_null("Dashboard/AnalogGauges")
		if instruments != null
		else null
	)
	var adapter := composition.input_adapter() as ProductionInputAdapter
	var hud := composition.active_screen() as CockpitHud
	var sonar_service = composition.sonar_service()
	var sonar_display = composition.sonar_display()
	_expect(composition.active_world() != null, "vehicle test world is assembled")
	_expect(actor != null, "production submarine actor is assembled")
	_expect(camera != null, "cockpit camera is attached to the submarine")
	_expect(instruments != null, "physical cockpit instruments are assembled")
	_expect(detailing != null, "cockpit structural detailing is assembled")
	_expect(pressure_bulkhead != null, "curved pressure bulkhead is assembled")
	_expect(analog_gauges != null, "dashboard analog instruments are assembled")
	_expect(hud != null, "critical HUD overlay is assembled")
	_expect(sonar_service != null, "production sonar service is assembled")
	_expect(sonar_display != null, "shared sonar presentation is assembled")
	_expect(composition.latest_update() != null, "dive session starts with a typed update")
	if (
		actor == null
		or camera == null
		or instruments == null
		or detailing == null
		or pressure_bulkhead == null
		or analog_gauges == null
		or adapter == null
		or hud == null
	):
		return

	_expect(instruments.get_node("%WindowFrame") is MeshInstance3D, "cockpit has a physical porthole frame")
	_expect(instruments.get_node("%Dashboard") is Node3D, "cockpit has a physical dashboard")
	_expect(instruments.get_node("%SonarScreen") is MeshInstance3D, "cockpit reserves a physical sonar display")
	_expect(detailing.pressure_hull_rib_count() >= 6, "cockpit exposes reinforced pressure-hull structure")
	_expect(detailing.pipe_segment_count() >= 13, "cockpit exposes a complete life-support pipe run")
	_expect(absf(detailing.battery_needle_degrees()) > 100.0, "analog battery gauge follows the dive snapshot")
	_expect(detailing.textures_are_loaded(), "cockpit loads its overhead and analog gauge textures")
	_expect(detailing.gauges_are_dashboard_mounted(), "analog gauges are mounted on the dashboard")
	_expect(detailing.dashboard_control_count() >= 8, "dashboard exposes physical auxiliary controls")
	_expect(pressure_bulkhead.panel_count() == 12, "porthole bulkhead uses twelve curved pressure panels")
	_expect(pressure_bulkhead.rectangular_whitebox_is_hidden(), "porthole rectangular whitebox is hidden")
	_expect(analog_gauges.indicator_count() == 3, "instrument binnacle exposes three inset pilot lights")
	_expect(analog_gauges.active_indicator_count() == 1, "exactly one pilot light reflects the alert state")
	_expect("kWh" in instruments.resources_text() and "kW" in instruments.resources_text(), "battery instrument has exact units")
	_expect("L/min" in instruments.resources_text(), "oxygen instrument has volume and consumption")
	_expect("bar" in instruments.integrity_text(), "hull instrument has current and certified pressure")
	_expect(not hud.alert_overlay_visible(), "normal telemetry stays on physical instruments only")
	_expect(
		instruments.sonar_texture() == sonar_display.sonar_texture(),
		"physical and expanded sonar views share one texture"
	)

	adapter.sonar_scan_requested.emit()
	var first_scan = sonar_service.current_scan()
	_expect(first_scan != null, "manual sonar command publishes a typed scan")
	_expect(first_scan.samples.observed_count() > 1000, "reference acquisition captures dense bathymetry")
	_expect(first_scan.contacts.size() >= 1, "metal calibration target becomes a distinct contact")
	_expect("RELEVÉ EN COURS" in sonar_display.status_text(), "sonar display reports progressive reveal")
	for frame in 8:
		await physics_frame
	_expect(sonar_display.built_row_count() > 0, "renderer reveals near rows incrementally")
	adapter.sonar_view_toggle_requested.emit()
	_expect(sonar_display.is_expanded(), "sonar can expand without pausing the dive")
	adapter.sonar_view_toggle_requested.emit()
	_expect(not sonar_display.is_expanded(), "expanded sonar returns to cockpit view")

	var start_position: Vector3 = actor.global_position
	var starting_battery: float = composition.latest_update().snapshot.battery.remaining_kwh
	Input.action_press(ProductionInputAdapter.ACTION_FORWARD)
	for frame in 35:
		await physics_frame
	Input.action_release(ProductionInputAdapter.ACTION_FORWARD)
	_expect(actor.global_position.distance_to(start_position) > 0.1, "keyboard propulsion moves the submarine")
	_expect(actor.velocity.length() > 0.1, "propulsion builds inertial velocity")
	_expect(
		composition.latest_update().snapshot.battery.remaining_kwh < starting_battery,
		"propulsion effort drains the domain battery"
	)

	var start_heading: float = actor.rotation.y
	Input.action_press(ProductionInputAdapter.ACTION_RIGHT)
	for frame in 24:
		await physics_frame
	Input.action_release(ProductionInputAdapter.ACTION_RIGHT)
	_expect(absf(actor.rotation.y - start_heading) > 0.01, "keyboard steering changes submarine heading")
	_expect(absf(actor.current_yaw_velocity_rps()) > 0.01, "yaw keeps angular inertia after release")
	for frame in 90:
		await physics_frame

	var settled_heading: float = actor.rotation.y
	var initial_look_yaw: float = camera.look_yaw_radians()
	var cockpit_transform: Transform3D = instruments.global_transform
	var mouse_motion := InputEventMouseMotion.new()
	mouse_motion.relative = Vector2(40.0, -20.0)
	adapter._unhandled_input(mouse_motion)
	await physics_frame
	_expect(absf(camera.look_yaw_radians() - initial_look_yaw) > 0.01, "mouse rotates the cockpit camera")
	_expect(absf(actor.rotation.y - settled_heading) < 0.001, "mouse does not steer the submarine")
	_expect(instruments.global_transform.is_equal_approx(cockpit_transform), "cockpit remains fixed while the player looks around")

	var paused_sequence: int = composition.latest_update().snapshot.tick_sequence
	var paused_sonar_progress: float = sonar_service.current_scan().reveal_progress
	adapter.pause_requested.emit()
	await process_frame
	_expect(paused, "pause menu suspends the scene tree")
	var pause_menu := composition.active_overlay() as PauseMenu
	_expect(pause_menu != null, "pause overlay is displayed")
	await process_frame
	await process_frame
	_expect(
		composition.latest_update().snapshot.tick_sequence == paused_sequence,
		"dive ticks are frozen while paused"
	)
	_expect(
		is_equal_approx(sonar_service.current_scan().reveal_progress, paused_sonar_progress),
		"sonar reveal is frozen while paused"
	)

	var controls_button := pause_menu.get_node("%ControlsButton") as Button
	controls_button.pressed.emit()
	await process_frame
	var controls := composition.active_overlay() as ControlsSettingsScreen
	_expect(controls != null, "controls settings open over the paused dive")
	_expect(adapter.binding_snapshots().size() == 11, "all gameplay keyboard bindings are exposed")

	var rebind_results: Array = []
	adapter.rebind_result_available.connect(
		func(result) -> void: rebind_results.append(result)
	)
	adapter.begin_rebind(ProductionInputAdapter.ACTION_FORWARD)
	adapter._unhandled_input(_pressed_key(KEY_UP))
	_expect(not rebind_results.is_empty() and rebind_results.back().accepted, "free key remapping is accepted")
	_expect(
		_binding_for(adapter, ProductionInputAdapter.ACTION_FORWARD) == "Up",
		"binding snapshot reflects the remapped key"
	)

	adapter.begin_rebind(ProductionInputAdapter.ACTION_BACKWARD)
	adapter._unhandled_input(_pressed_key(KEY_UP))
	_expect(
		not rebind_results.back().accepted
		and rebind_results.back().conflicting_action_id == ProductionInputAdapter.ACTION_FORWARD,
		"binding conflict identifies the existing action"
	)
	var swap_result = adapter.resolve_pending_conflict(true)
	_expect(swap_result.accepted, "conflicting bindings can be swapped")
	_expect(
		_binding_for(adapter, ProductionInputAdapter.ACTION_BACKWARD) == "Up",
		"requested action receives the conflicting key"
	)
	adapter.restore_default_bindings()
	_expect(
		_binding_for(adapter, ProductionInputAdapter.ACTION_FORWARD) == "W",
		"default bindings can be restored"
	)

	adapter.pause_requested.emit()
	await process_frame
	_expect(composition.active_overlay() is PauseMenu, "escape from settings returns to pause")
	adapter.pause_requested.emit()
	await process_frame
	_expect(not paused, "second escape resumes the dive")
	for frame in 3:
		await physics_frame
		if composition.latest_update().snapshot.tick_sequence > paused_sequence:
			break
	_expect(
		composition.latest_update().snapshot.tick_sequence > paused_sequence,
		"fixed dive ticks resume after pause"
	)


func _pressed_key(keycode: Key) -> InputEventKey:
	var event := InputEventKey.new()
	event.physical_keycode = keycode
	event.pressed = true
	return event


func _binding_for(adapter: ProductionInputAdapter, action_id: StringName) -> String:
	for binding in adapter.binding_snapshots():
		if binding.action_id == action_id:
			return binding.binding_text
	return ""


func _expect(condition: bool, label: String) -> void:
	if not condition:
		_failures.append(label)