class_name TreatmentManager
extends Node
## Drives nausea during an active treatment.
##
## When `start_ramp()` is called (wired to IV `iv_completed`), nausea ramps from
## its current value up to `ramp_target` over `ramp_duration` seconds, then holds.
## The SymptomManager autoload propagates changes to the tilt + desaturation
## effects, so this node only needs to push intensity values.

signal treatment_started
signal ramp_complete

## Target nausea intensity at the end of the initial ramp.
@export var ramp_target: float = 40.0
## How long (seconds) the initial ramp takes.
@export var ramp_duration: float = 30.0

var _ramping: bool = false
var _elapsed: float = 0.0
var _start_value: float = 0.0
var _sm: Node = null


func _ready() -> void:
	if is_inside_tree():
		_sm = get_tree().root.get_node_or_null("SymptomManager")
	if _sm == null:
		_sm = SymptomManager
	set_process(false)


## Begin the nausea ramp. Safe to wire directly to IVInsertion.iv_completed.
func start_ramp() -> void:
	if _sm == null:
		push_warning("TreatmentManager: SymptomManager not available.")
		return
	_start_value = _sm.get_intensity(_sm.NAUSEA)
	_elapsed = 0.0
	_ramping = true
	set_process(true)
	treatment_started.emit()


func _process(delta: float) -> void:
	if not _ramping:
		return
	_elapsed += delta
	var t := clampf(_elapsed / ramp_duration, 0.0, 1.0)
	var value := lerpf(_start_value, ramp_target, t)
	_sm.trigger_symptom(_sm.NAUSEA, value)
	if t >= 1.0:
		_ramping = false
		set_process(false)
		ramp_complete.emit()