grunk/src/game/game_manager.gd

class_name GameManagerType extends Node
## Autoloaded singleton encapsulating game state.

## Emitted just after `delta` is added to the player's grunk tank.
signal grunk_collected(delta: float)

## Emitted just before the alert level is raised to `new_value`.
signal alert_raised(new_value: int)

## Emitted just before the alert level is reset to zero.
signal alert_cleared

const MAX_ALERT := 6

var grunk_tank := 0.0

var alert_level := 0


## Add to the player's grunk tank.
func collect_grunk(delta: float) -> void:
	grunk_tank += delta
	grunk_collected.emit(delta)


## Raise the alert level, if possible.
func raise_alert(delta: int) -> void:
	var new_value := clampi(alert_level + delta, 0, MAX_ALERT)
	if new_value != alert_level:
		alert_raised.emit(new_value)
	alert_level = new_value


## Reset the alert level to zero.
func clear_alert() -> void:
	alert_cleared.emit()
	alert_level = 0