boomerang.dm

///The cooldown period between last_boomerang_throw and it's methods of implementing a rebound proc.
#define BOOMERANG_REBOUND_INTERVAL (1 SECONDS)
/**
 * If an ojvect is given the boomerang component, it should be thrown back to the thrower after either hitting it's target, or landing on the thrown tile.
 * Thrown objects should be thrown back to the original thrower with this component, a number of tiles defined by boomerang_throw_range.
 */
/datum/component/boomerang
	///How far should the boomerang try to travel to return to the thrower?
	var/boomerang_throw_range = 3
	///If this boomerang is thrown, does it re-enable the throwers throw mode?
	var/thrower_easy_catch_enabled = FALSE
	///This cooldown prevents our 2 throwing signals from firing too often based on how we implement those signals within thrown impacts.
	COOLDOWN_DECLARE(last_boomerang_throw)

/datum/component/boomerang/Initialize(boomerang_throw_range, thrower_easy_catch_enabled)
	. = ..()
	if(!isitem(parent)) //Only items support being thrown around like a boomerang, feel free to make this apply to humans later on.
		return COMPONENT_INCOMPATIBLE

	//Assignments
	if(boomerang_throw_range)
		src.boomerang_throw_range = boomerang_throw_range
	if(thrower_easy_catch_enabled)
		src.thrower_easy_catch_enabled = thrower_easy_catch_enabled

/datum/component/boomerang/RegisterWithParent()
	RegisterSignal(parent, COMSIG_MOVABLE_POST_THROW, PROC_REF(prepare_throw)) //Collect data on current thrower and the throwing datum
	RegisterSignal(parent, COMSIG_MOVABLE_THROW_LANDED, PROC_REF(return_missed_throw))
	RegisterSignal(parent, COMSIG_MOVABLE_IMPACT, PROC_REF(return_hit_throw))

/datum/component/boomerang/UnregisterFromParent()
	UnregisterSignal(parent, list(COMSIG_MOVABLE_POST_THROW, COMSIG_MOVABLE_THROW_LANDED, COMSIG_MOVABLE_IMPACT))

/**
 * Proc'd before the first thrown is performed in order to gather information regarding each throw as well as handle throw_mode as necessary.
 * * source: Datum src from original signal call.
 * * thrown_thing: The thrownthing datum from the parent object's latest throw. Updates thrown_boomerang.
 * * spin: Carry over from POST_THROW, the speed of rotation on the boomerang when thrown.
 */
/datum/component/boomerang/proc/prepare_throw(datum/source, datum/thrownthing/throwingdatum, spin)
	SIGNAL_HANDLER
	var/mob/thrower = throwingdatum?.get_thrower()
	if(thrower_easy_catch_enabled && thrower)
		if(iscarbon(thrower))
			var/mob/living/carbon/carbon_mob = thrower
			carbon_mob.throw_mode_on(THROW_MODE_TOGGLE)
	return

/**
 * Proc that triggers when the thrown boomerang hits an object.
 * * source: Datum src from original signal call.
 * * hit_atom: The atom that has been hit by the boomerang component.
 * * init_throwing_datum: The thrownthing datum that originally impacted the object, that we use to build the new throwing datum for the rebound.
 */
/datum/component/boomerang/proc/return_hit_throw(datum/source, atom/hit_atom, datum/thrownthing/init_throwing_datum)
	SIGNAL_HANDLER
	if (!COOLDOWN_FINISHED(src, last_boomerang_throw))
		return
	var/obj/item/true_parent = parent
	aerodynamic_swing(init_throwing_datum, true_parent)

/**
 * Proc that triggers when the thrown boomerang does not hit a target.
 * * source: Datum src from original signal call.
 * * throwing_datum: The thrownthing datum that originally impacted the object, that we use to build the new throwing datum for the rebound.
 */
/datum/component/boomerang/proc/return_missed_throw(datum/source, datum/thrownthing/throwingdatum)
	SIGNAL_HANDLER
	if(!COOLDOWN_FINISHED(src, last_boomerang_throw))
		return
	var/obj/item/true_parent = parent
	aerodynamic_swing(throwingdatum, true_parent)

/**
 * Proc that triggers when the thrown boomerang has been fully thrown, rethrowing the boomerang back to the thrower, and producing visible feedback.
 * * throwing_datum: The thrownthing datum that originally impacted the object, that we use to build the new throwing datum for the rebound.
 * * hit_atom: The atom that has been hit by the boomerang'd object.
 */
/datum/component/boomerang/proc/aerodynamic_swing(datum/thrownthing/throwingdatum, obj/item/true_parent)
	var/mob/thrown_by = true_parent.thrownby?.resolve()
	if(thrown_by)
		addtimer(CALLBACK(true_parent, TYPE_PROC_REF(/atom/movable, throw_at), thrown_by, boomerang_throw_range, throwingdatum.speed, null, TRUE), 0.1 SECONDS)
		COOLDOWN_START(src, last_boomerang_throw, BOOMERANG_REBOUND_INTERVAL)
	var/mob/thrower = throwingdatum?.get_thrower()
	true_parent.visible_message(span_danger("[true_parent] is flying back at [thrower]!"), \
						span_danger("You see [true_parent] fly back at you!"), \
						span_hear("You hear an aerodynamic woosh!"))

#undef BOOMERANG_REBOUND_INTERVAL