[MIRROR] Integrated circuits for modular computers (#26196)

Integrated circuits for modular computers (#80530)

This PR integrates circuits for modular computers and a good bits of
their programs.
The peculiarity here is that modular computers have no fixed amount of
unremovable components (except the base one with just a couple ports for
now), instead, they're added and removed along with programs. With a few
exceptions (such as the messenger and signaler), for these program
circuits to work, their associated program has to be either open or in
the background.

For a reason or another, not all programs have a circuit associated to
them, still, however the programs with a circuit are still a handful.
They are:
- Nanotrasen Pay System
- Notepad
- SiliConnect
- WireCarp
- MODsuit Control
- Spectre Meter
- Direct Messenger*
- LifeConnect
- Custodial Locator
- Fission360
- Camera
- Status Display
- SignalCommander

*By the by, sending messages has a cooldown, so it shouldn't be as
spammy. If it turns out to not be enough, I can make it so messages from
circuit will be ignored by other messenger circuits.

The PR is no longer WIP.

I believe modular computers could make for some interesting setups with
circuits, since they're fairly flexible and stocked with features unlike
many other appliances, therefore also a speck more abusable, though
limits, cooldowns, logging and sanitization have been implemented to
keep it in check.

🆑
add: Modular Computers now support integrated circuits. What can be done
with them depends on the programs installed and whether they're running
(open or background).
add: Modular Consoles (the machinery) now have a small backup cell they
draw power from if the power goes out.
/🆑

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/modules/modular_computers/file_system/program.dm

@@ -44,6 +44,40 @@
 	var/alert_pending = FALSE
 	/// How well this program will help combat detomatix viruses.
 	var/detomatix_resistance = NONE
+	/// Unremovable circuit componentn added to the physical computer while the program is installed
+	var/obj/item/circuit_component/mod_program/circuit_comp_type
+
+/datum/computer_file/program/New()
+	..()
+	///We need to ensure that different programs (subtypes mostly) won't try to load in the same circuit comps into the shell or usb port of the modpc.
+	if(circuit_comp_type && initial(circuit_comp_type.associated_program) != type)
+		stack_trace("circuit comp type mismatch: [type] has circuit comp type \[[circuit_comp_type]\], while \[[circuit_comp_type]\] has associated program \[[initial(circuit_comp_type.associated_program)]\].")
+
+/**
+ * Here we deal with peculiarity of adding unremovable components to the computer shell.
+ * It probably doesn't look badass, but it's a decent way of doing it without taining the component with
+ * oddities like this.
+ */
+/datum/computer_file/program/on_install(datum/computer_file/source, obj/item/modular_computer/computer_installing)
+	. = ..()
+	if(isnull(circuit_comp_type) || isnull(computer.shell))
+		return
+	if(!(locate(circuit_comp_type) in computer.shell.unremovable_circuit_components))
+		var/obj/item/circuit_component/mod_program/comp = new circuit_comp_type()
+		computer.shell.add_unremovable_circuit_component(comp)
+		if(computer.shell.attached_circuit)
+			comp.forceMove(computer.shell.attached_circuit)
+			computer.shell.attached_circuit.add_component(comp)
+
+///Here we deal with killing the associated components instead.
+/datum/computer_file/program/Destroy()
+	if(isnull(circuit_comp_type) || isnull(computer?.shell))
+		return ..()
+	for(var/obj/item/circuit_component/mod_program/comp in computer.shell.unremovable_circuit_components)
+		if(comp.associated_program == src)
+			computer.shell.unremovable_circuit_components -= comp
+			qdel(comp)
+	return ..()
 
 /datum/computer_file/program/clone()
 	var/datum/computer_file/program/temp = ..()
@@ -67,10 +101,6 @@
 /datum/computer_file/program/ui_interact(mob/user, datum/tgui/ui)
 	SHOULD_CALL_PARENT(FALSE)
 
-///We are not calling parent as it's handled by the computer itself, this is only called after.
-/datum/computer_file/program/ui_act(action, params, datum/tgui/ui, datum/ui_state/state)
-	SHOULD_CALL_PARENT(FALSE)
-
 // Relays icon update to the computer.
 /datum/computer_file/program/proc/update_computer_icon()
 	if(computer)
@@ -167,12 +197,13 @@
  **/
 /datum/computer_file/program/proc/on_start(mob/living/user)
 	SHOULD_CALL_PARENT(TRUE)
-	if(can_run(user, loud = TRUE))
-		if(program_flags & PROGRAM_REQUIRES_NTNET)
-			var/obj/item/card/id/ID = computer.computer_id_slot?.GetID()
-			generate_network_log("Connection opened -- Program ID:[filename] User:[ID?"[ID.registered_name]":"None"]")
-		return TRUE
-	return FALSE
+	if(!can_run(user, loud = TRUE))
+		return FALSE
+	if(program_flags & PROGRAM_REQUIRES_NTNET)
+		var/obj/item/card/id/ID = computer.computer_id_slot?.GetID()
+		generate_network_log("Connection opened -- Program ID:[filename] User:[ID?"[ID.registered_name]":"None"]")
+	SEND_SIGNAL(src, COMSIG_COMPUTER_PROGRAM_START, user)
+	return TRUE
 
 /**
  * Kills the running program
@@ -189,25 +220,29 @@
 		computer.active_program = null
 		if(!QDELETED(computer) && computer.enabled)
 			INVOKE_ASYNC(computer, TYPE_PROC_REF(/obj/item/modular_computer, update_tablet_open_uis), user)
-	if(src in computer.idle_threads)
+	else if(src in computer.idle_threads)
 		computer.idle_threads.Remove(src)
+	else //The program wasn't running to begin with.
+		return FALSE
 
 	if(program_flags & PROGRAM_REQUIRES_NTNET)
 		var/obj/item/card/id/ID = computer.computer_id_slot?.GetID()
 		generate_network_log("Connection closed -- Program ID: [filename] User:[ID ? "[ID.registered_name]" : "None"]")
 
 	computer.update_appearance(UPDATE_ICON)
+	SEND_SIGNAL(src, COMSIG_COMPUTER_PROGRAM_KILL, user)
 	return TRUE
 
 ///Sends the running program to the background/idle threads. Header programs can't be minimized and will kill instead.
-/datum/computer_file/program/proc/background_program()
+/datum/computer_file/program/proc/background_program(mob/user)
 	SHOULD_CALL_PARENT(TRUE)
-	if(program_flags & PROGRAM_HEADER)
+	if(program_flags & PROGRAM_HEADER || length(computer.idle_threads) > computer.max_idle_programs)
 		return kill_program()
 
 	computer.idle_threads.Add(src)
 	computer.active_program = null
 
-	computer.update_tablet_open_uis(usr)
+	if(user)
+		INVOKE_ASYNC(computer, TYPE_PROC_REF(/obj/item/modular_computer, update_tablet_open_uis), user)
 	computer.update_appearance(UPDATE_ICON)
 	return TRUE