///Footstep element. Plays footsteps at parents location when it is appropriate.
/datum/element/footstep
	element_flags = ELEMENT_DETACH|ELEMENT_BESPOKE
	id_arg_index = 2
	///A list containing living mobs and the number of steps they have taken since the last time their footsteps were played.
	var/list/steps_for_living = list()
	///volume determines the extra volume of the footstep. This is multiplied by the base volume, should there be one.
	var/volume
	///e_range stands for extra range - aka how far the sound can be heard. This is added to the base value and ignored if there isn't a base value.
	var/e_range
	///footstep_type is a define which determines what kind of sounds should get chosen.
	var/footstep_type
	///This can be a list OR a soundfile OR null. Determines whatever sound gets played.
	var/footstep_sounds
	///Whether or not to add variation to the sounds played
	var/sound_vary = FALSE

/datum/element/footstep/Attach(datum/target, footstep_type = FOOTSTEP_MOB_BAREFOOT, volume = 0.5, e_range = -8, sound_vary = FALSE)
	. = ..()
	if(!ismovable(target))
		return ELEMENT_INCOMPATIBLE
	src.volume = volume
	src.e_range = e_range
	src.footstep_type = footstep_type
	src.sound_vary = sound_vary
	switch(footstep_type)
		if(FOOTSTEP_MOB_HUMAN)
			if(!ishuman(target))
				return ELEMENT_INCOMPATIBLE
			RegisterSignal(target, COMSIG_MOVABLE_MOVED, .proc/play_humanstep)
			steps_for_living[target] = 0
			return
		if(FOOTSTEP_MOB_CLAW)
			footstep_sounds = GLOB.clawfootstep
		if(FOOTSTEP_MOB_BAREFOOT)
			footstep_sounds = GLOB.barefootstep
		if(FOOTSTEP_MOB_HEAVY)
			footstep_sounds = GLOB.heavyfootstep
		if(FOOTSTEP_MOB_SHOE)
			footstep_sounds = GLOB.footstep
		if(FOOTSTEP_MOB_SLIME)
			footstep_sounds = 'sound/effects/footstep/slime1.ogg'
		if(FOOTSTEP_OBJ_MACHINE)
			footstep_sounds = 'sound/effects/bang.ogg'
			RegisterSignal(target, COMSIG_MOVABLE_MOVED, .proc/play_simplestep_machine)
			return
		if(FOOTSTEP_OBJ_ROBOT)
			footstep_sounds = 'sound/effects/tank_treads.ogg'
			RegisterSignal(target, COMSIG_MOVABLE_MOVED, .proc/play_simplestep_machine)
			return
	RegisterSignal(target, COMSIG_MOVABLE_MOVED, .proc/play_simplestep)
	steps_for_living[target] = 0

/datum/element/footstep/Detach(atom/movable/source)
	UnregisterSignal(source, COMSIG_MOVABLE_MOVED)
	steps_for_living -= source
	return ..()

///Prepares a footstep for living mobs. Determines if it should get played. Returns the turf it should get played on. Note that it is always a /turf/open
/datum/element/footstep/proc/prepare_step(mob/living/source)
	var/turf/open/turf = get_turf(source)
	if(!istype(turf))
		return

	if(!turf.footstep || source.buckled || source.throwing || source.movement_type & (VENTCRAWLING | FLYING) || HAS_TRAIT(source, TRAIT_IMMOBILIZED))
		return

	if(source.body_position == LYING_DOWN) //play crawling sound if we're lying
		playsound(turf, 'sound/effects/footstep/crawl1.ogg', 15 * volume, falloff_distance = 1, vary = sound_vary)
		return

	if(iscarbon(source))
		var/mob/living/carbon/carbon_source = source
		if(!carbon_source.get_bodypart(BODY_ZONE_L_LEG) && !carbon_source.get_bodypart(BODY_ZONE_R_LEG))
			return
		if(carbon_source.m_intent == MOVE_INTENT_WALK)
			return// stealth
	steps_for_living[source] += 1
	var/steps = steps_for_living[source]

	if(steps >= 6)
		steps_for_living[source] = 0
		steps = 0

	if(steps % 2)
		return

	if(steps != 0 && !source.has_gravity(turf)) // don't need to step as often when you hop around
		return
	return turf

/datum/element/footstep/proc/play_simplestep(mob/living/source)
	SIGNAL_HANDLER

	var/turf/open/source_loc = prepare_step(source)
	if(!source_loc)
		return
	if(isfile(footstep_sounds) || istext(footstep_sounds))
		playsound(source_loc, footstep_sounds, volume, falloff_distance = 1, vary = sound_vary)
		return
	var/turf_footstep
	switch(footstep_type)
		if(FOOTSTEP_MOB_CLAW)
			turf_footstep = source_loc.clawfootstep
		if(FOOTSTEP_MOB_BAREFOOT)
			turf_footstep = source_loc.barefootstep
		if(FOOTSTEP_MOB_HEAVY)
			turf_footstep = source_loc.heavyfootstep
		if(FOOTSTEP_MOB_SHOE)
			turf_footstep = source_loc.footstep
	if(!turf_footstep)
		return
	playsound(source_loc, pick(footstep_sounds[turf_footstep][1]), footstep_sounds[turf_footstep][2] * volume, TRUE, footstep_sounds[turf_footstep][3] + e_range, falloff_distance = 1, vary = sound_vary)

/datum/element/footstep/proc/play_humanstep(mob/living/carbon/human/source)
	SIGNAL_HANDLER

	if(HAS_TRAIT(source, TRAIT_SILENT_FOOTSTEPS))
		return

	var/volume_multiplier = 1
	var/range_adjustment = 0

	if(HAS_TRAIT(source, TRAIT_LIGHT_STEP))
		volume_multiplier = 0.6
		range_adjustment = -2

	var/turf/open/source_loc = prepare_step(source)
	if(!source_loc)
		return

	if ((source.wear_suit?.body_parts_covered | source.w_uniform?.body_parts_covered | source.shoes?.body_parts_covered) & FEET)
		// we are wearing shoes
		playsound(source_loc, pick(GLOB.footstep[source_loc.footstep][1]),
			GLOB.footstep[source_loc.footstep][2] * volume * volume_multiplier,
			TRUE,
			GLOB.footstep[source_loc.footstep][3] + e_range + range_adjustment, falloff_distance = 1, vary = sound_vary)
	else
		if(source.dna.species.special_step_sounds)
			playsound(source_loc, pick(source.dna.species.special_step_sounds), 50, TRUE, falloff_distance = 1, vary = sound_vary)
		else
			playsound(source_loc, pick(GLOB.barefootstep[source_loc.barefootstep][1]),
				GLOB.barefootstep[source_loc.barefootstep][2] * volume * volume_multiplier,
				TRUE,
				GLOB.barefootstep[source_loc.barefootstep][3] + e_range + range_adjustment, falloff_distance = 1, vary = sound_vary)


///Prepares a footstep for machine walking
/datum/element/footstep/proc/play_simplestep_machine(atom/movable/source)
	SIGNAL_HANDLER

	var/turf/open/source_loc = get_turf(source)
	if(!istype(source_loc))
		return
	playsound(source_loc, footstep_sounds, 50, falloff_distance = 1, vary = sound_vary)