package DamageDetection
import OnUnitEnterLeave

/**
	Use `addOnDamageFunc` to add a listener to any damage event that happens on the map.
	Example:

		init
			addOnDamageFunc() ->
				print("Damage Event with dmg: " + GetEventDamage().toString())
*/

@configurable constant SWAP_TIMEOUT = 600.

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

constant filter = Filter(() -> addUnit(GetFilterUnit()))

function addUnit(unit u)
	current.registerUnitEvent(u, EVENT_UNIT_DAMAGED)

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

/** 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()
	let isEnabled = IsTriggerEnabled(current)

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

	toDestroy = current
	current = CreateTrigger()

	if not isEnabled
		current.disable()

	ENUM_GROUP.enumUnitsAll(filter)

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

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

	onEnter(() -> addUnit(getEnterLeaveUnit()))
	CreateTimer().startPeriodic(SWAP_TIMEOUT, function swap)