class_name IVInsertion
extends Node3D
## IV insertion sequence. Presents an IV arm in front of the seated player,
## plays a short needle-approach + tape-press animation, then emits
## `iv_completed` which starts the treatment timer.

signal iv_completed

@export var auto_hide_on_complete: bool = true
@export var needle_approach_time: float = 1.2
@export var tape_press_time: float = 0.6
@export var hold_time: float = 0.5

@onready var needle: Node3D = $Arm/Needle
@onready var tape: Node3D = $Arm/Tape

var _needle_start: Vector3
var _needle_end: Vector3
var _tape_hidden_scale: Vector3 = Vector3(1, 0.01, 1)
var _tape_shown_scale: Vector3 = Vector3.ONE
var _running: bool = false


func _ready() -> void:
	visible = false
	if needle:
		_needle_start = needle.position
		# Needle ends pressed into the arm (move toward the arm along +Z/-Y a touch).
		_needle_end = needle.position + Vector3(0, -0.04, -0.08)
	if tape:
		tape.scale = _tape_hidden_scale


## Begin the IV insertion sequence. Safe to wire directly to `player_seated`.
func begin_sequence() -> void:
	if _running:
		return
	_running = true
	visible = true
	if needle:
		needle.position = _needle_start
	if tape:
		tape.scale = _tape_hidden_scale

	var tween := create_tween()
	tween.set_trans(Tween.TRANS_SINE).set_ease(Tween.EASE_IN_OUT)
	# Needle approaches and presses in.
	if needle:
		tween.tween_property(needle, "position", _needle_end, needle_approach_time)
	# Tape presses on.
	if tape:
		tween.tween_property(tape, "scale", _tape_shown_scale, tape_press_time)
	# Brief hold, then finish.
	tween.tween_interval(hold_time)
	tween.tween_callback(_on_sequence_finished)


func _on_sequence_finished() -> void:
	_running = false
	if auto_hide_on_complete:
		visible = false
	iv_completed.emit()