extends SceneTree
## Read-only benchmark. Loads a diagnostic JSON, never invokes SaveManager.
const E = preload("res://world/owniverse/math/exact.gd")

func _initialize():
    call_deferred("run")

func restore_json_integers(value):
    # JSON parses ordinary integer tokens as float. Large integers are $exact.
    if value is float and value == floorf(value) and absf(value) <= 9007199254740991:
        return int(value)
    if value is Dictionary:
        for key in value: value[key] = restore_json_integers(value[key])
    elif value is Array:
        for i in value.size(): value[i] = restore_json_integers(value[i])
    return value

func run():
    var args = OS.get_cmdline_user_args()
    if args.is_empty():
        print("Usage: --script tests/benchmark_saved_state.gd -- /path/to/save.adventure.json [delta_seconds]")
        quit(1)
        return
    var data = JSON.parse_string(FileAccess.get_file_as_string(args[0]))
    if not data is Dictionary or data.get("format_version") != 5:
        push_error("Expected diagnostic JSON format 5")
        quit(1)
        return
    var initial: Dictionary = E.decode(restore_json_integers(data)).state
    var delta: float = args[1].to_float() if args.size() > 1 else 1.0 / 60.0
    if not is_finite(delta) or delta <= 0:
        quit(1)
        return
    for speed in [1, 4, 6]:
        var world = load("res://world/owniverse/owniverse.gd").new()
        world.catalog.load_definitions(root.get_node("Global").OwniverseEntities)
        world.state = initial.duplicate(true)
        world.speed = speed
        var elapsed: Array = []
        for cycle in 6:
            var start: int = Time.get_ticks_usec()
            world.evolute(delta)
            elapsed.append((Time.get_ticks_usec() - start) / 1000.0)
        print("Speed %d, six consecutive %s-second steps, ms: %s" % [speed, delta, elapsed])
        for entity in world.catalog.entities.values(): entity.free()
        world.free()
    quit()