extends SceneTree

## P06-03 outage recovery across a real process boundary. "-- writer" saves
## mid-outage and records its own recovery; "-- reader" restores that save in a
## new Godot process, recovers the same way and must match exactly. Recovery
## must never clear DESTROYED or RAIDED suspension.
const ManaOutage = preload("res://tests/helpers/mana_outage.gd")
const OUTAGE_SAVE := "user://saves/p06_03_recovery_new_pid"
const EXPECTED_PATH := "user://saves/p06_03_recovery_new_pid_expected.json"
const RECOVERY_MINUTES := 30
var _checks := 0
var _failures := 0


func _initialize() -> void:
	call_deferred("_run")


func _run() -> void:
	var mode := "reader" if "reader" in OS.get_cmdline_user_args() else "writer"
	print("S2: P06-03 Mana recovery new-PID %s (pid %d)" % [mode, OS.get_process_id()])
	if mode == "writer":
		_write()
	else:
		_read()
	print("%s: %d checks" % ["PASS" if _failures == 0 else "FAIL", _checks])
	quit(_failures)


func _new_runtime() -> Array:
	var clock: Variant = load("res://autoload/game_clock.gd").new()
	var state: Variant = load("res://autoload/game_state.gd").new()
	var runtime: Variant = load("res://autoload/simulation_runtime.gd").new()
	clock.reset(1, 6, 0)
	state.reset()
	runtime.initialize(clock, state, 6606)
	clock.set_paused(true)
	return [clock, state, runtime]


func _facility(runtime: Variant, definition_id: StringName) -> FacilityInstance:
	for facility: FacilityInstance in runtime.facility_service.get_instances():
		if facility.definition_id == definition_id:
			return facility
	return null


func _summary(runtime: Variant, state: Variant) -> Dictionary:
	var rows := {}
	for facility: FacilityInstance in runtime.facility_service.get_instances():
		rows[String(facility.definition_id)] = {
			"power": facility.power_available,
			"suspension": String(facility.suspension_reason),
			"operation": facility.operation_state,
		}
	return {"mana": state.get_resource(&"mana"), "facilities": rows}


func _recover(clock: Variant, state: Variant, runtime: Variant) -> void:
	ManaOutage.release(runtime, state, 0)
	clock.advance_minutes(RECOVERY_MINUTES)


func _write() -> void:
	var nodes := _new_runtime()
	var clock: Variant = nodes[0]
	var state: Variant = nodes[1]
	var runtime: Variant = nodes[2]
	_expect(runtime.submit_command(&"build_facility", {&"definition_id": &"reception", &"origin": Vector3i(-6, 0, 0)}).is_success(), "build reception")
	clock.advance_minutes(120)
	_expect(runtime.submit_command(&"build_facility", {&"definition_id": &"standard_room", &"origin": Vector3i(-6, 2, 0)}).is_success(), "build room on supported floor")
	var cafeteria_built := false
	for x: int in [-2, 2, -8, -10]:
		if runtime.submit_command(&"build_facility", {&"definition_id": &"cafeteria", &"origin": Vector3i(x, 0, 0)}).is_success():
			cafeteria_built = true
			break
	_expect(cafeteria_built, "build cafeteria on ground floor")
	clock.advance_minutes(180)
	var reception := _facility(runtime, &"reception")
	var cafeteria := _facility(runtime, &"cafeteria")
	var room := _facility(runtime, &"standard_room")
	_expect(reception != null and cafeteria != null and room != null, "facilities complete normally")
	if reception == null or cafeteria == null or room == null:
		return
	runtime.facility_service.set_operational_status(cafeteria.instance_id, {&"suspension_reason": &"DESTROYED"}, clock.absolute_minute)
	runtime.facility_service.set_operational_status(room.instance_id, {&"suspension_reason": &"RAIDED"}, clock.absolute_minute)
	ManaOutage.hold(runtime, state)
	clock.advance_minutes(15)
	_expect(not _facility(runtime, &"reception").power_available, "outage stops the tower")
	var outage: Dictionary = runtime.create_snapshot()
	_expect(SaveService.save_snapshot(OUTAGE_SAVE, outage)[&"ok"], "writer saves mid-outage")
	_recover(clock, state, runtime)
	var summary := _summary(runtime, state)
	_check_recovered(summary)
	var file := FileAccess.open(EXPECTED_PATH, FileAccess.WRITE)
	_expect(file != null, "writer records recovery")
	if file != null:
		file.store_string(JSON.stringify({
			"writer_pid": OS.get_process_id(),
			"summary": summary,
			"digest": SimulationDigest.compute(runtime.create_snapshot()),
		}))
		file.close()
	for node: Variant in nodes:
		node.free()


func _read() -> void:
	var expected: Variant = JSON.parse_string(FileAccess.get_file_as_string(EXPECTED_PATH))
	_expect(expected is Dictionary, "reader finds writer record")
	if not expected is Dictionary:
		return
	_expect(int(expected["writer_pid"]) != OS.get_process_id(), "reader runs in a different process")
	var nodes := _new_runtime()
	var clock: Variant = nodes[0]
	var state: Variant = nodes[1]
	var runtime: Variant = nodes[2]
	var loaded := SaveService.load_snapshot(OUTAGE_SAVE)
	_expect(loaded[&"ok"] and runtime.restore_snapshot(loaded[&"snapshot"]), "reader restores mid-outage save")
	_expect(state.get_resource(&"mana") == 0 and not _facility(runtime, &"reception").power_available, "restored tower is still stopped")
	_recover(clock, state, runtime)
	var summary := _summary(runtime, state)
	_check_recovered(summary)
	_expect(JSON.stringify(JSON.parse_string(JSON.stringify(summary))) == JSON.stringify(expected["summary"]), "recovered facility states match the writer")
	_expect(SimulationDigest.compute(runtime.create_snapshot()) == String(expected["digest"]), "whole recovered state digest matches the writer")
	SaveService.delete_save(OUTAGE_SAVE)
	DirAccess.remove_absolute(ProjectSettings.globalize_path(EXPECTED_PATH))
	for node: Variant in nodes:
		node.free()


func _check_recovered(summary: Dictionary) -> void:
	var rows: Dictionary = summary["facilities"]
	_expect(int(summary["mana"]) > 0, "world tree refills the reserve after the outage")
	_expect(bool(rows["reception"]["power"]) and String(rows["reception"]["suspension"]) == "", "ordinary facility power returns")
	_expect(bool(rows["cafeteria"]["power"]) and String(rows["cafeteria"]["suspension"]) == "DESTROYED" and int(rows["cafeteria"]["operation"]) == FacilityInstance.OperationState.SUSPENDED, "recovery does not clear destruction")
	_expect(bool(rows["standard_room"]["power"]) and String(rows["standard_room"]["suspension"]) == "RAIDED" and int(rows["standard_room"]["operation"]) == FacilityInstance.OperationState.SUSPENDED, "recovery does not clear raid suspension")


func _expect(condition: bool, label: String) -> void:
	_checks += 1
	if condition:
		print("  ✓ %s" % label)
	else:
		_failures += 1
		push_error("  ✗ %s" % label)