-- Dialogable: a mixin that makes any Entity subclass talkable. `include` it and
-- give the entity a `self.book` (an Ink book); bumping the entity then opens the
-- modal Dialogue. npcs, signs, artifacts — anything you can talk to — are just
-- Dialogables. For now an entity carries one book; later it can swap books as it
-- progresses. All it does is route a bump to the dialogue manager.
Dialogable = {}

function Dialogable:onBump()
	if self.book then
		local wasOpen = Dialogue.isOpen()
		Dialogue.open(self.book, self:dialogueBindings())
		if Sound and not wasOpen then Sound.jabber() end
	end
	return true
end

-- Ink external functions exposed to this talker's book. A walking NPC (one that
-- includes Walker) can be sent to a named Mark with `~ walk_to("mark_name")`,
-- e.g. to leave after a conversation.
function Dialogable:dialogueBindings()
	local talker = self
	return {
		walk_to = function(markName)
			if talker.sendTo then talker:sendTo(markName) end
		end,
	}
end