Makes playing cards playable -- significantly reworks card interactions (#26585)

* Basic card interactions

* initial interactions sorted

* nails down some interactions, radial menu

* Some more qol and keybind changes

* improves card interactions

* Unum decks can be flipped, showing the top card

* Decks can now be split and recombined

* minor tweaks to multi-deck stuff

* Clean up a bunch of interactions

* more cleanups

* more cleanups and documentation

* remote attacking looks pretty good

* minor cleanups

* ci

* parser errs

* Remove some debug things, re-add signal after merge

* Adds a whole bunch more qol.

* Improves examine messages

* ci

* concealed cards will now show properly in radial

* Fixes some weird proximity monitor and control issues

* Address reviews, clean up examine a bit more

* radial fixes

* remove todos

* Apply suggestions from code review

Co-authored-by: Burzah <116982774+Burzah@users.noreply.github.com>
Signed-off-by: Luc <89928798+lewcc@users.noreply.github.com>

* better documentation, adds label of who did what

* b etter grammar

* augh

* missing icon state

* Update code/game/gamemodes/wizard/magic_tarot.dm

Co-authored-by: Burzah <116982774+Burzah@users.noreply.github.com>
Signed-off-by: Luc <89928798+lewcc@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: DGamerL <108773801+DGamerL@users.noreply.github.com>
Signed-off-by: Luc <89928798+lewcc@users.noreply.github.com>

* Add sleep on proximity monitor setup to hopefully avoid mapload issues

* been writing too much c lately

* Try late initialize

* late init

* 🧌

* map load

---------

Signed-off-by: Luc <89928798+lewcc@users.noreply.github.com>
Co-authored-by: Burzah <116982774+Burzah@users.noreply.github.com>
Co-authored-by: DGamerL <108773801+DGamerL@users.noreply.github.com>

code/modules/games/tarot.dm

@@ -15,7 +15,7 @@
 
 /obj/item/deck/tarot/deckshuffle()
 	var/mob/living/user = usr
-	if(cooldown < world.time - 1 SECONDS)
+	if(shuffle_cooldown < world.time - 1 SECONDS)
 		var/list/newcards = list()
 		while(length(cards))
 			var/datum/playingcard/P = pick(cards)
@@ -27,9 +27,9 @@
 		cards = newcards
 		playsound(user, 'sound/items/cardshuffle.ogg', 50, TRUE)
 		user.visible_message(
-			"<span class='notice'>[user] shuffles [src].</span>", 
+			"<span class='notice'>[user] shuffles [src].</span>",
 			"<span class='notice'>You shuffle [src].</span>",
 			"<span class='notice'>You hear cards being shuffled.</span>"
 		)
-		cooldown = world.time
+		shuffle_cooldown = world.time
 

code/modules/games/unum.dm

@@ -4,6 +4,19 @@
 	desc = "A deck of UNUM! cards. House rules to argue over not included."
 	icon_state = "deck_unum_full"
 	card_style = "unum"
+	/// Whether or not this deck should show the backs or fronts of its cards.
+	var/show_front = FALSE
+
+/obj/item/deck/unum/examine(mob/user)
+	. = ..()
+	. += "<span class='notice'>When held in hand, <b>Alt-Shift-Click</b> to flip [src].</span>"
+
+/obj/item/deck/unum/AltShiftClick(mob/user)
+	if(!Adjacent(user) || (user.get_active_hand() != src) && (user.get_inactive_hand() != src))
+		return
+	show_front = !show_front
+	visible_message("<span class='notice'>[user] flips over [src].</span>")
+	update_appearance(UPDATE_ICON_STATE|UPDATE_OVERLAYS)
 
 /obj/item/deck/unum/build_deck()
 	for(var/color in list("Red", "Yellow", "Green", "Blue"))
@@ -21,6 +34,7 @@
 /obj/item/deck/unum/update_icon_state()
 	if(!length(cards))
 		icon_state = "deck_[card_style]_empty"
+		show_front = FALSE
 		return
 	var/percent = round((length(cards) / deck_total) * 100)
 	switch(percent)
@@ -31,3 +45,20 @@
 		else
 			icon_state = "deck_[deck_style ? "[deck_style]_" : ""][card_style]_full"
 
+/obj/item/deck/unum/update_overlays()
+	. = ..()
+	if(!length(cards) || !show_front)
+		return
+	var/percent = round((length(cards) / deck_total) * 100)
+	var/datum/playingcard/P = cards[1]
+	var/image/I = new(icon, P.card_icon)
+	switch(percent)
+		if(0 to 20)
+			I.pixel_y = 1
+		if(21 to 50)
+			I.pixel_y = 2
+		else
+			I.pixel_y = 4
+	. += I
+
+

code/modules/mob/living/carbon/human/human_inventory.dm

@@ -11,7 +11,6 @@
 		return l_hand
 	if(istype(r_hand,typepath))
 		return r_hand
-	return 0
 
 
 /mob/living/carbon/human/proc/has_organ(name)