Bubberstation/code/datums/components/explodable.dm

///Component specifically for explosion sensetive things, currently only applies to heat based explosions but can later perhaps be used for things that are dangerous to handle carelessly like nitroglycerin.
/datum/component/explodable
	/// The devastation range of the resulting explosion.
	var/devastation_range = 0
	/// The heavy impact range of the resulting explosion.
	var/heavy_impact_range = 0
	/// The light impact range of the resulting explosion.
	var/light_impact_range = 2
	/// The flame range of the resulting explosion.
	var/flame_range = 0
	/// The flash range of the resulting explosion.
	var/flash_range = 3
	/// Whether this explosion ignores the bombcap.
	var/uncapped
	/// Whether we always delete. Useful for nukes turned plasma and such, so they don't default delete and can survive
	var/delete_after
	/// For items, lets us determine where things should be hit.
	var/equipped_slot
	/// Whether this component is currently in the process of exploding.
	var/tmp/exploding = FALSE

/datum/component/explodable/Initialize(devastation_range, heavy_impact_range, light_impact_range, flame_range, flash_range, uncapped = FALSE, delete_after = EXPLODABLE_DELETE_PARENT)
	if(!isatom(parent))
		return COMPONENT_INCOMPATIBLE

	RegisterSignal(parent, COMSIG_ATOM_ATTACKBY, PROC_REF(explodable_attack))
	RegisterSignal(parent, COMSIG_ATOM_EX_ACT, PROC_REF(detonate))
	RegisterSignal(parent, COMSIG_ATOM_TOOL_ACT(TOOL_WELDER), PROC_REF(welder_react))
	RegisterSignal(parent, COMSIG_ATOM_BULLET_ACT, PROC_REF(projectile_react))
	if(ismovable(parent))
		RegisterSignal(parent, COMSIG_MOVABLE_IMPACT, PROC_REF(explodable_impact))
		RegisterSignal(parent, COMSIG_MOVABLE_BUMP, PROC_REF(explodable_bump))
		if(isitem(parent))
			RegisterSignals(parent, list(COMSIG_ITEM_ATTACK, COMSIG_ITEM_ATTACK_ATOM, COMSIG_ITEM_HIT_REACT), PROC_REF(explodable_attack))
			if(isclothing(parent))
				RegisterSignal(parent, COMSIG_ITEM_EQUIPPED, PROC_REF(on_equip))
				RegisterSignal(parent, COMSIG_ITEM_DROPPED, PROC_REF(on_drop))

	var/atom/atom_parent = parent
	if(atom_parent.atom_storage)
		RegisterSignal(parent, COMSIG_ATOM_ENTERED, PROC_REF(explodable_insert_item))

	if (devastation_range)
		src.devastation_range = devastation_range
	if (heavy_impact_range)
		src.heavy_impact_range = heavy_impact_range
	if (light_impact_range)
		src.light_impact_range = light_impact_range
	if (flame_range)
		src.flame_range = flame_range
	if (flash_range)
		src.flash_range = flash_range
	src.uncapped = uncapped
	src.delete_after = delete_after

/// Explode if our parent is a storage place and something with high heat is inserted in.
/datum/component/explodable/proc/explodable_insert_item(datum/source, obj/item/I)
	SIGNAL_HANDLER
	if(!(I.item_flags & IN_STORAGE))
		return
	check_if_detonate(I)

/datum/component/explodable/proc/explodable_impact(datum/source, atom/hit_atom, datum/thrownthing/throwing_datum, caught)
	SIGNAL_HANDLER

	if(!caught)
		check_if_detonate(hit_atom)

/datum/component/explodable/proc/explodable_bump(datum/source, atom/A)
	SIGNAL_HANDLER

	check_if_detonate(A)

///Called when you use this object to attack sopmething
/datum/component/explodable/proc/explodable_attack(datum/source, atom/movable/target, mob/living/user)
	SIGNAL_HANDLER

	check_if_detonate(target)

/// Welder check. Here because tool_act is higher priority than attackby.
/datum/component/explodable/proc/welder_react(datum/source, mob/user, obj/item/tool)
	SIGNAL_HANDLER

	if(check_if_detonate(tool))
		return ITEM_INTERACT_BLOCKING

/// Shot by something
/datum/component/explodable/proc/projectile_react(datum/source, obj/projectile/shot)
	SIGNAL_HANDLER

	if(shot.damage_type == BURN && shot.damage > 0)
		detonate()

///Called when you attack a specific body part of the thing this is equipped on. Useful for exploding pants.
/datum/component/explodable/proc/explodable_attack_zone(datum/source, damage, damagetype, def_zone, ...)
	SIGNAL_HANDLER

	if(!def_zone)
		return
	if(damagetype != BURN) //Don't bother if it's not fire.
		return
	if(isbodypart(def_zone))
		var/obj/item/bodypart/hitting = def_zone
		def_zone = hitting.body_zone
	if(!is_hitting_zone(def_zone)) //You didn't hit us! ha!
		return
	detonate()

/datum/component/explodable/proc/on_equip(datum/source, mob/equipper, slot)
	SIGNAL_HANDLER

	RegisterSignal(equipper, COMSIG_MOB_APPLY_DAMAGE,  PROC_REF(explodable_attack_zone), TRUE)

/datum/component/explodable/proc/on_drop(datum/source, mob/user)
	SIGNAL_HANDLER

	UnregisterSignal(user, COMSIG_MOB_APPLY_DAMAGE)

/// Checks if we're hitting the zone this component is covering
/datum/component/explodable/proc/is_hitting_zone(def_zone)
	var/obj/item/item = parent
	var/mob/living/carbon/wearer = item.loc //Get whoever is equipping the item currently
	if(!istype(wearer))
		return FALSE

	var/list/worn_items = wearer.get_equipped_items()

	if(!(item in worn_items))
		return FALSE

	if(item.body_parts_covered & def_zone)
		return TRUE
	return FALSE

/datum/component/explodable/proc/check_if_detonate(target)
	if(!isitem(target))
		return
	var/obj/item/I = target
	if(I.get_temperature() > FIRE_MINIMUM_TEMPERATURE_TO_EXIST)
		detonate() //If we're touching a hot item we go boom
		return TRUE

/// Explode and remove the object
/datum/component/explodable/proc/detonate()
	SIGNAL_HANDLER
	if (exploding)
		return // If we don't do this and this doesn't delete it can lock the MC into only processing Input, Timers, and Explosions.

	var/atom/bomb = parent
	var/log = TRUE
	if(light_impact_range < 1)
		log = FALSE

	exploding = TRUE
	explosion(bomb, devastation_range, heavy_impact_range, light_impact_range, flame_range, flash_range, log, uncapped) //epic explosion time

	switch(delete_after)
		if(EXPLODABLE_DELETE_SELF)
			qdel(src)
		if(EXPLODABLE_DELETE_PARENT)
			qdel(bomb)
		else
			addtimer(CALLBACK(src, PROC_REF(reset_exploding)), 0.1 SECONDS)

/**
 * Resets the expoding flag
 */
/datum/component/explodable/proc/reset_exploding()
	SIGNAL_HANDLER
	src.exploding = FALSE