class_name RegionTransform
extends Node

@export var offset: Vector3
@export var region: Vector3i
@export var target: Node3D

func _enter_tree() -> void:
    if not target:
        target = get_parent()
    RegionOrigin.add_node(target)

func _exit_tree() -> void:
    RegionOrigin.remove_node(target)

func move_offset(delta_offset: Vector3) -> void:
    set_offset(offset + delta_offset)

func set_offset(new_offset: Vector3) -> void:
    offset = new_offset
    var delta_sector: Vector3i = _floor_ftoi(new_offset / 1000.0)
    region += delta_sector
    offset -= Vector3(delta_sector) * 1000.0
    sync_to_transform()

func altitude() -> float:
    return offset.y + float(region.y) * 1000.0

func sync_to_transform() -> void:
    target.transform.origin = offset + Vector3(region - RegionOrigin.origin)

func sync_from_transform() -> void:
    set_offset(target.transform.origin)

static func _floor_ftoi(vec: Vector3) -> Vector3i:
    return Vector3i(int(floorf(vec.x)), int(floorf(vec.y)), int(floorf(vec.z)))