/obj/structure/machinery/computer
	name = "computer"
	icon = 'icons/obj/modular_computers/modular_console.dmi'
	icon_state = "computer"
	layer = ABOVE_STRUCTURE_LAYER
	density = 1
	anchored = 1.0
	idle_power_usage = 300
	active_power_usage = 300
	clicksound = SFX_KEYBOARD
	maxhealth = OBJECT_HEALTH_MEDIUM
	/// The path to the circuit board type. If circuit==null, the computer can't be disassembled.
	var/circuit = null
	var/processing = 0

	var/icon_screen = "computer_generic"
	var/icon_scanline
	var/icon_keyboard = "green_key"
	var/icon_keyboard_emis = "green_key_mask"
	var/light_range_on = 2
	var/light_power_on = 1.3
	var/overlay_layer
	var/is_holographic = TRUE
	var/icon_broken = "broken"
	var/is_connected = FALSE
	var/has_off_keyboards = FALSE
	var/can_pass_under = TRUE

	/// The zlevel that this computer is spawned on.
	var/starting_z_level = null

	/// The access cable inserted into this computer, if any.
	var/obj/item/access_cable/inserted_cable

	/// Contains the name of the TGUI interface file opened when using this computer. If null,
	var/ui_type = ""

/obj/structure/machinery/computer/Initialize()
	. = ..()
	overlay_layer = layer
	starting_z_level = src.z
	power_change()
	update_icon()

/obj/structure/machinery/computer/Destroy()
	if(inserted_cable)
		inserted_cable.retract()
		inserted_cable = null
	return ..()

/obj/structure/machinery/computer/emp_act(severity)
	. = ..()

	if(prob(20/severity))
		set_broken()

/obj/structure/machinery/computer/ex_act(severity)
	switch(severity)
		if(1.0)
			qdel(src)
			return
		if(2.0)
			if (prob(25))
				qdel(src)
				return
			if (prob(50))
				for(var/x in verbs)
					verbs -= x
				set_broken()
		if(3.0)
			if (prob(25))
				for(var/x in verbs)
					verbs -= x
				set_broken()
	return

/obj/structure/machinery/computer/bullet_act(obj/projectile/hitting_projectile, def_zone, piercing_hit)
	. = ..()
	if(. != BULLET_ACT_HIT)
		return .

	if(prob(hitting_projectile.get_structure_damage()))
		set_broken()

/obj/structure/machinery/computer/update_icon()

	if(dir == SOUTH)
		layer = ABOVE_HUMAN_LAYER
	ClearOverlays()
	if(!interact_offline && (stat & NOPOWER)) // we only stop here if we care about power
		set_light(0)
		return
	else
		set_light(light_range_on, light_power_on, light_color)

	icon_state = initial(icon_state)

	//Connecting multiple computers in a row
	if(is_connected)
		var/append_string = ""
		var/left = turn(dir, 90)
		var/right = turn(dir, -90)
		var/turf/L = get_step(src, left)
		var/turf/R = get_step(src, right)
		var/obj/structure/machinery/computer/LC = locate() in L
		var/obj/structure/machinery/computer/RC = locate() in R
		if(LC && LC.dir == dir && initial(LC.icon_state) == "computer")
			append_string += "_L"
		if(RC && RC.dir == dir && initial(RC.icon_state) == "computer")
			append_string += "_R"
		icon_state = "computer[append_string]"

	if(stat & BROKEN)
		icon_state = "[icon_state]-broken"
		if (overlay_layer != layer)
			AddOverlays(image(icon, icon_broken, overlay_layer))
		else
			AddOverlays(icon_broken)
	else if (icon_screen)
		if (is_holographic)
			var/mutable_appearance/screen_overlay = overlay_image(src.icon, icon_screen)
			var/mutable_appearance/screen_overlay_holographic = overlay_image(src.icon, icon_screen)
			screen_overlay_holographic.filters += filter(type="color", color=list(
				0, 0, 0, 0,
				0, 0, 0, 0,
				0, 0, 0, 0,
				HOLOSCREEN_MULTIPLICATION_FACTOR, HOLOSCREEN_MULTIPLICATION_FACTOR, HOLOSCREEN_MULTIPLICATION_FACTOR, HOLOSCREEN_MULTIPLICATION_OPACITY
			))
			screen_overlay.filters += filter(type="color", color=list(
				HOLOSCREEN_ADDITION_OPACITY, 0, 0, 0,
				0, HOLOSCREEN_ADDITION_OPACITY, 0, 0,
				0, 0, HOLOSCREEN_ADDITION_OPACITY, 0,
				0, 0, 0, 1
			))
			screen_overlay.blend_mode = BLEND_ADD
			screen_overlay_holographic.blend_mode = BLEND_MULTIPLY
			var/mutable_appearance/screen_overlay_emis = emissive_appearance(src.icon, icon_screen)
			AddOverlays(screen_overlay_holographic)
			AddOverlays(screen_overlay)
			AddOverlays(screen_overlay_emis)
		if (icon_scanline)
			AddOverlays(icon_scanline)
		if (icon_keyboard)
			if((stat & NOPOWER) && has_off_keyboards)
				AddOverlays("[icon_keyboard]_off")
			else
				AddOverlays(icon_keyboard)
				if(icon_keyboard_emis)
					var/mutable_appearance/emis = emissive_appearance(icon, icon_keyboard_emis)
					AddOverlays(emis)
		else if (overlay_layer != layer)
			AddOverlays(image(icon, icon_screen, overlay_layer))
		else
			AddOverlays(icon_screen)

/obj/structure/machinery/computer/power_change()
	..()
	update_icon()
	if(stat & NOPOWER)
		set_light(0)
	else
		set_light(light_range_on, light_power_on, light_color)


/obj/structure/machinery/computer/proc/set_broken()
	stat |= BROKEN
	update_icon()

/obj/structure/machinery/computer/proc/decode(text)
	// Adds line breaks
	text = replacetext(text, "\n", "<BR>")
	return text

/obj/structure/machinery/computer/on_death(damage, damage_flags, damage_type, armor_penetration, obj/weapon)
	var/obj/structure/computerframe/A = new /obj/structure/computerframe(loc)
	A.anchored = TRUE
	if(prob(50))
		var/obj/item/circuitboard/M = new circuit(A)
		A.circuit = M
	else
		new /obj/effect/decal/cleanable/blood/oil(loc)
		new /obj/item/trash/broken_electronics(loc)
	new /obj/item/material/shard(loc)
	new /obj/effect/decal/cleanable/blood/oil(loc)
	spark(A, 5, GLOB.alldirs)
	. = ..()

/obj/structure/machinery/computer/attackby(obj/item/attacking_item, mob/user)
	if(attacking_item.tool_behaviour == TOOL_SCREWDRIVER)
		if(circuit)
			if(attacking_item.use_tool(src, user, 20, volume = 50))
				var/obj/structure/computerframe/A = new /obj/structure/computerframe( src.loc )
				var/obj/item/circuitboard/M = new circuit(A)
				A.circuit = M
				A.anchored = TRUE
				for(var/obj/C in src)
					C.forceMove(src.loc)
				if(src.stat & BROKEN)
					to_chat(user, SPAN_NOTICE("The broken glass falls out."))
					new /obj/item/material/shard( src.loc )
					A.state = 3
					A.icon_state = "3"
				else
					to_chat(user, SPAN_NOTICE("You disconnect the glass keyboard panel."))
					A.state = 4
					A.icon_state = "4"
				M.deconstruct(src)
				qdel(src)
		else if(stat & BROKEN)
			to_chat(user, SPAN_NOTICE("You start fixing \the [src]..."))
			if(attacking_item.use_tool(src, user, 5 SECONDS, volume = 50))
				to_chat(user, SPAN_NOTICE("You fix the console's screen and tie up a few loose cables."))
				stat &= ~BROKEN
				update_icon()
		return TRUE
	else
		if(istype(attacking_item, /obj/item/access_cable))
			var/obj/item/access_cable/access_cable = attacking_item
			if(inserted_cable)
				to_chat(user, SPAN_WARNING("There's already a cable in the universal port!"))
				return

			if(do_after(user, 1 SECONDS))
				visible_message(SPAN_NOTICE("[user] slots \the [access_cable] into \the [src]."))
				insert_cable(access_cable, user)
		return ..()

/obj/structure/machinery/computer/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
	if (!mover)
		return 1
	if(mover?.movement_type & PHASING)
		return TRUE
	if(istype(mover,/obj/projectile) && density && is_holographic)
		if (prob(80))
//Holoscreens are non solid, and the frames of the computers are thin. So projectiles will usually
//pass through
			return 1
		else
			return 0
	else if((mover.pass_flags & PASSTABLE) && can_pass_under)
//Animals can run under them, lots of empty space
		return 1
	return ..()

// screens have a layer above, so we can't attach here
/obj/structure/machinery/computer/can_attach_sticker(var/mob/user, var/obj/item/sticker/S)
	to_chat(user, SPAN_WARNING("\The [src]'s non-stick surface prevents you from attaching a sticker to it!"))
	return FALSE

/obj/structure/machinery/computer/insert_cable(obj/item/access_cable/cable, mob/user)
	. = ..()
	inserted_cable = cable
	cable.create_cable(src)

/obj/structure/machinery/computer/cable_interact(obj/item/access_cable/cable, mob/user)
	. = ..()
	attack_hand(user)

/obj/structure/machinery/computer/remove_cable(obj/item/access_cable/cable)
	..()
	inserted_cable = null

/obj/structure/machinery/computer/terminal
	name = "terminal"
	icon = 'icons/obj/modular_computers/modular_terminal.dmi'
	is_connected = TRUE
	has_off_keyboards = TRUE
	can_pass_under = FALSE
	light_power_on = 1

/obj/structure/machinery/computer/terminal/inactive
	name = "inactive terminal"
	light_power = 0
	light_power_on = 0
	light_range_on = 0