class_name NetPickable
extends Node

## Networks an XRToolsPickable (RigidBody3D). Default authority is the server,
## which simulates free items and syncs their transform. Grabbing an item with a
## hand transfers authority to the grabbing client (its local kinematic grab
## driver then drives the synced transform); releasing returns authority and the
## throw velocity to the server. Non-authority peers keep the body frozen and
## follow the synced transform, so only one machine ever simulates an item.

@onready var _item: XRToolsPickable = get_parent() as XRToolsPickable

var net_held_by := 0  # peer id currently holding (0 = free); kept consistent via NetworkManager
var _was_authority := true


func _ready() -> void:
	if not _item:
		push_error("NetPickable must be a child of an XRToolsPickable")
		return
	_item.grabbed.connect(_on_grabbed)
	_item.released.connect(_on_released)
	_was_authority = _item.is_multiplayer_authority()
	_apply_authority_state()


func _physics_process(_delta: float) -> void:
	if not NetworkManager.is_online():
		return
	var mine := _item.is_multiplayer_authority()
	if mine != _was_authority:
		_was_authority = mine
		_apply_authority_state()


# Configure physics for whether we own this item or merely mirror it.
func _apply_authority_state() -> void:
	if not _item:
		return
	if _item.is_multiplayer_authority():
		# We own physics: simulate the item whenever it is not held.
		if not _item.is_picked_up():
			_item.freeze = false
	else:
		# Someone else owns it: follow the synced transform kinematically.
		_item.freeze = true
		_item.freeze_mode = RigidBody3D.FREEZE_MODE_KINEMATIC


func _on_grabbed(_pickable: Node3D, by: Node3D) -> void:
	if not NetworkManager.is_online():
		return
	# Only hand grabs transfer authority; snap-zone grabs are server-driven.
	if not (by is XRToolsFunctionPickup):
		return
	NetworkManager.request_item_authority.rpc_id(1, _item.get_path())


func _on_released(_pickable: Node3D, by: Node3D) -> void:
	if not NetworkManager.is_online():
		return
	if not (by is XRToolsFunctionPickup):
		return
	NetworkManager.release_item_authority.rpc_id(1, _item.get_path(), _item.linear_velocity, _item.angular_velocity)