label.dm

/**
	The label component.

	This component is used to manage labels applied by the hand labeler.

	Atoms can only have one instance of this component, and therefore only one label at a time.
	This is to avoid having names like "Backpack (label1) (label2) (label3)". This is annoying and abnoxious to read.

	When a player clicks the atom with a hand labeler to apply a label, this component gets applied to it.
	If the labeler is off, the component will be removed from it, and the label will be removed from its name.
 */
/datum/component/label
	dupe_mode = COMPONENT_DUPE_UNIQUE_PASSARGS
	/// The name of the label the player is applying to the parent.
	var/label_name

/datum/component/label/Initialize(_label_name)
	if(!isatom(parent))
		return COMPONENT_INCOMPATIBLE

	label_name = _label_name
	apply_label()

/datum/component/label/RegisterWithParent()
	RegisterSignal(parent, COMSIG_PARENT_ATTACKBY, .proc/OnAttackby)
	RegisterSignal(parent, COMSIG_PARENT_EXAMINE, .proc/Examine)

/datum/component/label/UnregisterFromParent()
	UnregisterSignal(parent, list(COMSIG_PARENT_ATTACKBY, COMSIG_PARENT_EXAMINE))

/**
	This proc will fire after the parent is hit by a hand labeler which is trying to apply another label.
	Since the parent already has a label, it will remove the old one from the parent's name, and apply the new one.
*/
/datum/component/label/InheritComponent(datum/component/label/new_comp , i_am_original, _label_name)
	remove_label()
	if(new_comp)
		label_name = new_comp.label_name
	else
		label_name = _label_name
	apply_label()

/**
	This proc will trigger when any object is used to attack the parent.

	If the attacking object is not a hand labeler, it will return.
	If the attacking object is a hand labeler it will restore the name of the parent to what it was before this component was added to it, and the component will be deleted.

	Arguments:
	* source: The parent.
	* attacker: The object that is hitting the parent.
	* user: The mob who is wielding the attacking object.
*/
/datum/component/label/proc/OnAttackby(datum/source, obj/item/attacker, mob/user)
	SIGNAL_HANDLER

	// If the attacking object is not a hand labeler or its mode is 1 (has a label ready to apply), return.
	// The hand labeler should be off (mode is 0), in order to remove a label.
	var/obj/item/hand_labeler/labeler = attacker
	if(!istype(labeler) || labeler.mode)
		return

	remove_label()
	playsound(parent, 'sound/items/poster_ripped.ogg', 20, TRUE)
	to_chat(user, "<span class='warning'>You remove the label from [parent].</span>")
	qdel(src) // Remove the component from the object.

/**
	This proc will trigger when someone examines the parent.
	It will attach the text found in the body of the proc to the `examine_list` and display it to the player examining the parent.

	Arguments:
	* source: The parent.
	* user: The mob exmaining the parent.
	* examine_list: The current list of text getting passed from the parent's normal examine() proc.
*/
/datum/component/label/proc/Examine(datum/source, mob/user, list/examine_list)
	SIGNAL_HANDLER

	examine_list += "<span class='notice'>It has a label with some words written on it. Use a hand labeler to remove it.</span>"

/// Applies a label to the name of the parent in the format of: "parent_name (label)"
/datum/component/label/proc/apply_label()
	var/atom/owner = parent
	owner.name += " ([label_name])"

/// Removes the label from the parent's name
/datum/component/label/proc/remove_label()
	var/atom/owner = parent
	owner.name = replacetext(owner.name, "([label_name])", "") // Remove the label text from the parent's name, wherever it's located.
	owner.name = trim(owner.name) // Shave off any white space from the beginning or end of the parent's name.