package DamageDetection
import MapBounds
import OnUnitEnterLeave

constant SWAP_TIMEOUT = 600.

boolexpr array func
integer funcNext = 0
trigger current = null
trigger toDestroy = null

/** CONFIGURATION: Add any conditions before the Register-Call
	to keep units from being registered to the damage event. */
function unit.detectAddFilter()
	TriggerRegisterUnitEvent(current, this, EVENT_UNIT_DAMAGED)

/** Add a Condition(Action) to the damage Event. */
public function addOnDamageFunc(boolexpr cf)
	current.addCondition(cf)
	func[funcNext] = cf
	funcNext++

/** Disables the damage events */
public function disableDamageDetect()
	DisableTrigger(current)

/** Enables the damage events */
public function enableDamageDetect()
	EnableTrigger(current)


/** Periodic Cleanup-Function */
function swap()
	boolean b = IsTriggerEnabled(current)

	current.disable()
	if toDestroy != null
		DestroyTrigger(toDestroy)

	toDestroy = current
	current = CreateTrigger()

	if not(b)
		DisableTrigger(current)


	GroupEnumUnitsInRect(ENUM_GROUP, boundRect, Filter(() -> GetFilterUnit().detectAddFilter()))

	for i = 0 to funcNext-1
		current.addCondition(func[i])


init
	current = CreateTrigger()
	for i = 0 to funcNext-1
		current.addCondition(func[i])
	onEnter(() -> getEnterLeaveUnit().detectAddFilter())
	GroupEnumUnitsInRect(ENUM_GROUP, boundRect, Filter(() -> GetFilterUnit().detectAddFilter()))
	CreateTimer().startPeriodic(SWAP_TIMEOUT, function swap)