#define DEFAULT_MAP_SIZE 15

/datum/computer_file/program/secureye
	filename = "secureye"
	filedesc = "SecurEye"
	downloader_category = PROGRAM_CATEGORY_SECURITY
	ui_header = "borg_mon.gif"
	program_open_overlay = "generic"
	extended_desc = "This program allows access to standard security camera networks."
	program_flags = PROGRAM_ON_NTNET_STORE | PROGRAM_REQUIRES_NTNET
	download_access = list(ACCESS_SECURITY)
	can_run_on_flags = PROGRAM_CONSOLE | PROGRAM_LAPTOP
	size = 5
	tgui_id = "NtosSecurEye"
	program_icon = "eye"

	///Boolean on whether or not the app will make noise when flipping around the channels.
	var/spying = FALSE

	var/list/network = list("ss13")
	///List of weakrefs of all users watching the program.
	var/list/concurrent_users = list()

	/// Weakref to the active camera
	var/datum/weakref/camera_ref
	/// The turf where the camera was last updated.
	var/turf/last_camera_turf

	// Stuff needed to render the map
	var/atom/movable/screen/map_view/cam_screen
	/// All the plane masters that need to be applied.
	var/atom/movable/screen/background/cam_background

	///Internal tracker used to find a specific person and keep them on cameras.
	var/datum/trackable/internal_tracker

///Syndicate subtype that has no access restrictions and is available on Syndinet
/datum/computer_file/program/secureye/syndicate
	filename = "syndeye"
	filedesc = "SyndEye"
	extended_desc = "This program allows for illegal access to security camera networks."
	download_access = list()
	can_run_on_flags = PROGRAM_ALL
	program_flags = PROGRAM_ON_SYNDINET_STORE | PROGRAM_UNIQUE_COPY

	network = list("ss13", "mine", "rd", "labor", "ordnance", "minisat")
	spying = TRUE

/datum/computer_file/program/secureye/on_install(datum/computer_file/source, obj/item/modular_computer/computer_installing)
	. = ..()
	// Map name has to start and end with an A-Z character,
	// and definitely NOT with a square bracket or even a number.
	var/map_name = "camera_console_[REF(src)]_map"
	// Convert networks to lowercase
	for(var/i in network)
		network -= i
		network += lowertext(i)
	// Initialize map objects
	cam_screen = new
	cam_screen.generate_view(map_name)
	cam_background = new
	cam_background.assigned_map = map_name
	cam_background.del_on_map_removal = FALSE
	RegisterSignal(src, COMSIG_TRACKABLE_TRACKING_TARGET, PROC_REF(on_track_target))

/datum/computer_file/program/secureye/Destroy()
	QDEL_NULL(cam_screen)
	QDEL_NULL(cam_background)
	QDEL_NULL(internal_tracker)
	last_camera_turf = null
	return ..()

/datum/computer_file/program/secureye/kill_program(mob/user)
	if(user)
		ui_close(user)
	return ..()

/datum/computer_file/program/secureye/ui_interact(mob/user, datum/tgui/ui)
	// Update the camera, showing static if necessary and updating data if the location has moved.
	update_active_camera_screen()

	var/user_ref = REF(user)
	var/is_living = isliving(user)
	// Ghosts shouldn't count towards concurrent users, which produces
	// an audible terminal_on click.
	if(is_living)
		concurrent_users += user_ref
	// Register map objects
	cam_screen.display_to(user)
	user.client.register_map_obj(cam_background)

/datum/computer_file/program/secureye/ui_status(mob/user)
	. = ..()
	if(. == UI_DISABLED)
		return UI_CLOSE
	return .

/datum/computer_file/program/secureye/ui_data()
	var/list/data = list()
	data["activeCamera"] = null
	var/obj/machinery/camera/active_camera = camera_ref?.resolve()
	if(active_camera)
		data["activeCamera"] = list(
			name = active_camera.c_tag,
			ref = REF(active_camera),
			status = active_camera.status,
		)
	return data

/datum/computer_file/program/secureye/ui_static_data(mob/user)
	var/list/data = list()
	data["network"] = network
	data["mapRef"] = cam_screen.assigned_map
	data["can_spy"] = !!spying
	var/list/cameras = get_camera_list(network)
	data["cameras"] = list()
	for(var/i in cameras)
		var/obj/machinery/camera/C = cameras[i]
		data["cameras"] += list(list(
			name = C.c_tag,
			ref = REF(C),
		))

	return data

/datum/computer_file/program/secureye/ui_act(action, params, datum/tgui/ui, datum/ui_state/state)
	. = ..()
	if(.)
		return
	switch(action)
		if("switch_camera")
			var/obj/machinery/camera/selected_camera = locate(params["camera"]) in GLOB.cameranet.cameras
			if(selected_camera)
				camera_ref = WEAKREF(selected_camera)
			else
				camera_ref = null
			if(!spying)
				playsound(computer, get_sfx(SFX_TERMINAL_TYPE), 25, FALSE)
			if(isnull(camera_ref))
				return TRUE
			if(internal_tracker && internal_tracker.tracking)
				internal_tracker.set_tracking(FALSE)

			update_active_camera_screen()
			return TRUE

		if("start_tracking")
			if(!internal_tracker)
				internal_tracker = new(src)
			internal_tracker.set_tracked_mob(usr)
			return TRUE

/datum/computer_file/program/secureye/proc/on_track_target(datum/trackable/source, mob/living/target)
	SIGNAL_HANDLER
	var/datum/camerachunk/target_camerachunk = GLOB.cameranet.getTurfVis(get_turf(target))
	if(!target_camerachunk)
		CRASH("[src] was able to track [target] through /datum/trackable, but was not on a visible turf to cameras.")
	for(var/obj/machinery/camera/cameras as anything in target_camerachunk.cameras["[target.z]"])
		var/found_target = locate(target) in cameras.can_see()
		if(!found_target)
			continue
		var/new_camera = WEAKREF(cameras)
		if(camera_ref == new_camera)
			return
		camera_ref = new_camera
		update_active_camera_screen()
		return

/datum/computer_file/program/secureye/ui_close(mob/user)
	. = ..()
	//don't track anyone while we're shutting off.
	if(internal_tracker && internal_tracker.tracking)
		internal_tracker.set_tracking(FALSE)
	var/user_ref = REF(user)
	var/is_living = isliving(user)
	// Living creature or not, we remove you anyway.
	concurrent_users -= user_ref
	// Unregister map objects
	cam_screen.hide_from(user)
	// Turn off the console
	if(length(concurrent_users) == 0 && is_living)
		camera_ref = null
		last_camera_turf = null
		if(!spying)
			playsound(computer, 'sound/machines/terminal_off.ogg', 25, FALSE)

/datum/computer_file/program/secureye/proc/update_active_camera_screen()
	var/obj/machinery/camera/active_camera = camera_ref?.resolve()
	// Show static if can't use the camera
	if(!active_camera?.can_use())
		show_camera_static()
		return

	var/list/visible_turfs = list()

	// Get the camera's turf to correctly gather what's visible from it's turf, in case it's located in a moving object (borgs / mechs)
	var/new_cam_turf = get_turf(active_camera)

	// If we're not forcing an update for some reason and the cameras are in the same location,
	// we don't need to update anything.
	// Most security cameras will end here as they're not moving.
	if(last_camera_turf == new_cam_turf)
		return

	// Cameras that get here are moving, and are likely attached to some moving atom such as cyborgs.
	last_camera_turf = new_cam_turf

	//Here we gather what's visible from the camera's POV based on its view_range and xray modifier if present
	var/list/visible_things = active_camera.isXRay(ignore_malf_upgrades = TRUE) ? range(active_camera.view_range, new_cam_turf) : view(active_camera.view_range, new_cam_turf)

	for(var/turf/visible_turf in visible_things)
		visible_turfs += visible_turf

	//Get coordinates for a rectangle area that contains the turfs we see so we can then clear away the static in the resulting rectangle area
	var/list/bbox = get_bbox_of_atoms(visible_turfs)
	var/size_x = bbox[3] - bbox[1] + 1
	var/size_y = bbox[4] - bbox[2] + 1

	cam_screen.vis_contents = visible_turfs
	cam_background.icon_state = "clear"
	cam_background.fill_rect(1, 1, size_x, size_y)

/datum/computer_file/program/secureye/proc/show_camera_static()
	cam_screen.vis_contents.Cut()
	cam_background.icon_state = "scanline2"
	cam_background.fill_rect(1, 1, DEFAULT_MAP_SIZE, DEFAULT_MAP_SIZE)

#undef DEFAULT_MAP_SIZE