extends Node
## Autoload singleton managing symptom states.
##
## Intensities are floats in the range [0, 100]. Nausea is the MVP symptom but
## the API is generic so future symptoms (fatigue, taste distortion, etc.) can
## reuse it. Register this script as an autoload named `SymptomManager`.

## Emitted whenever any symptom intensity changes.
## `symptom_id` is the changed symptom, `value` its new clamped intensity.
signal symptom_intensity_changed(symptom_id: StringName, value: float)

## Convenience signal specific to nausea (MVP visual effects subscribe to this).
signal nausea_intensity_changed(value: float)

const MIN_INTENSITY: float = 0.0
const MAX_INTENSITY: float = 100.0

## Well-known symptom ids.
const NAUSEA: StringName = &"nausea"

var _intensities: Dictionary = {}


## Set a symptom's intensity to an absolute value (clamped to [0, 100]).
func trigger_symptom(symptom_id: StringName, intensity: float) -> void:
	_set_intensity(symptom_id, intensity)


## Add (or subtract, with a negative delta) to a symptom's current intensity.
func add_intensity(symptom_id: StringName, delta: float) -> void:
	_set_intensity(symptom_id, get_intensity(symptom_id) + delta)


## Return a symptom's current intensity, or 0.0 if never set.
func get_intensity(symptom_id: StringName) -> float:
	return _intensities.get(symptom_id, 0.0)


## Reset all symptoms to 0 (e.g. between treatments / new game).
func reset_all() -> void:
	for symptom_id in _intensities.keys():
		_set_intensity(symptom_id, 0.0)


func _set_intensity(symptom_id: StringName, value: float) -> void:
	var clamped := clampf(value, MIN_INTENSITY, MAX_INTENSITY)
	if is_equal_approx(_intensities.get(symptom_id, 0.0), clamped):
		return
	_intensities[symptom_id] = clamped
	symptom_intensity_changed.emit(symptom_id, clamped)
	if symptom_id == NAUSEA:
		nausea_intensity_changed.emit(clamped)