/datum/nanite_program
	var/name = "Generic Nanite Program"
	var/desc = "Warn a coder if you can read this."

	var/datum/component/nanites/nanites
	var/mob/living/host_mob

	var/use_rate = 0 			//Amount of nanites used while active
	var/unique = TRUE			//If there can be more than one copy in the same nanites
	var/can_trigger = FALSE		//If the nanites have a trigger function (used for the programming UI)
	var/trigger_cost = 0		//Amount of nanites required to trigger
	var/trigger_cooldown = 50	//Deciseconds required between each trigger activation
	var/next_trigger = 0		//World time required for the next trigger activation

	var/program_flags = NONE
	var/passive_enabled = FALSE //If the nanites have an on/off-style effect, it's tracked by this var

	var/list/rogue_types = list(/datum/nanite_program/glitch) //What this can turn into if it glitches.
	//As a rule of thumb, these should be:
	//A: simpler
	//B: negative
	//C: affecting the same parts of the body, roughly
	//B is mostly a consequence of A: it's always going to be simpler to cause damage than to repair it, so a software bug will not randomly make the flesh eating
	//nanites learn how to repair cells.
	//Given enough glitch-swapping you'll end up with stuff like necrotic or toxic nanites, which are very simple as they just try to eat what's in front of them
	//or just lie around polluting the blood


	//The following vars are customizable
	var/activated = TRUE 			//If FALSE, the program won't process, disables passive effects, can't trigger and doesn't consume nanites

	var/timer_restart = 0 			//When deactivated, the program will wait X deciseconds before self-reactivating. Also works if the program begins deactivated.
	var/timer_shutdown = 0 			//When activated, the program will wait X deciseconds before self-deactivating. Also works if the program begins activated.
	var/timer_trigger = 0			//[Trigger only] While active, the program will attempt to trigger once every x deciseconds.
	var/timer_trigger_delay = 0				//[Trigger only] While active, the program will delay trigger signals by X deciseconds.

	//Indicates the next world.time tick where these timers will act
	var/timer_restart_next = 0
	var/timer_shutdown_next = 0
	var/timer_trigger_next = 0
	var/timer_trigger_delay_next = 0

	//Signal codes, these handle remote input to the nanites. If set to 0 they'll ignore signals.
	var/activation_code 	= 0 	//Code that activates the program [1-9999]
	var/deactivation_code 	= 0 	//Code that deactivates the program [1-9999]
	var/kill_code 			= 0		//Code that permanently removes the program [1-9999]
	var/trigger_code 		= 0 	//Code that triggers the program (if available) [1-9999]

	//Extra settings
	///Don't ever override this or I will come to your house and stand menacingly behind a bush
	VAR_FINAL/list/extra_settings = list()

	//Rules
	//Rules that automatically manage if the program's active without requiring separate sensor programs
	var/list/datum/nanite_rule/rules = list()
	var/all_rules_required = TRUE			//Whether all rules are required for positive condition or any of specified

	/// Corruptable - able to have code/configuration changed
	var/corruptable = TRUE
	/// error flicking - able to be randomly toggled by errors
	var/error_flicking = TRUE
	/// immutable - cannot be overwritten by other programs
	var/immutable = FALSE

/datum/nanite_program/New()
	. = ..()
	register_extra_settings()

/datum/nanite_program/Destroy()
	extra_settings = null
	if(host_mob)
		if(activated)
			deactivate()
		if(passive_enabled)
			disable_passive_effect()
		on_mob_remove()
	if(nanites)
		nanites.programs -= src
		nanites.permanent_programs -= src
	for(var/datum/nanite_rule/rule as anything in rules)
		rule.remove()
	rules.Cut()
	return ..()

/**
  * Checks if we're a permanent program
  */
/datum/nanite_program/proc/is_permanent()
	return nanites && (src in nanites.permanent_programs)

/datum/nanite_program/proc/copy()
	var/datum/nanite_program/new_program = new type()
	copy_programming(new_program, TRUE)

	return new_program

/datum/nanite_program/proc/copy_programming(datum/nanite_program/target, copy_activated = TRUE)
	if(target.immutable)
		return
	if(copy_activated)
		target.activated = activated
	target.timer_restart = timer_restart
	target.timer_shutdown = timer_shutdown
	target.timer_trigger = timer_trigger
	target.timer_trigger_delay = timer_trigger_delay
	target.activation_code = activation_code
	target.deactivation_code = deactivation_code
	target.kill_code = kill_code
	target.trigger_code = trigger_code

	target.rules = list()
	for(var/R in rules)
		var/datum/nanite_rule/rule = R
		rule.copy_to(target)
	target.all_rules_required = all_rules_required

	if(istype(target,src))
		copy_extra_settings_to(target)

///Register extra settings by overriding this.
///extra_settings[name] = new typepath() for each extra setting
/datum/nanite_program/proc/register_extra_settings()
	return

///You can override this if you need to have special behavior after setting certain settings.
/datum/nanite_program/proc/set_extra_setting(setting, value)
	var/datum/nanite_extra_setting/ES = extra_settings[setting]
	return ES.set_value(value)

///You probably shouldn't be overriding this one, but I'm not a cop.
/datum/nanite_program/proc/get_extra_setting_value(setting)
	var/datum/nanite_extra_setting/ES = extra_settings[setting]
	return ES.get_value()

///Used for getting information about the extra settings to the frontend
/datum/nanite_program/proc/get_extra_settings_frontend()
	var/list/out = list()
	for(var/name in extra_settings)
		var/datum/nanite_extra_setting/ES = extra_settings[name]
		out += ES.get_frontend_list(name)
	return out

///Copy of the list instead of direct reference for obvious reasons
/datum/nanite_program/proc/copy_extra_settings_to(datum/nanite_program/target)
	var/list/copy_list = list()
	for(var/ns_name in extra_settings)
		var/datum/nanite_extra_setting/extra_setting = extra_settings[ns_name]
		copy_list[ns_name] = extra_setting.get_copy()
	target.extra_settings = copy_list

/datum/nanite_program/proc/on_add(datum/component/nanites/_nanites)
	nanites = _nanites
	if(nanites.host_mob)
		on_mob_add()

/datum/nanite_program/proc/on_mob_add()
	host_mob = nanites.host_mob
	if(activated) //apply activation effects depending on initial status; starts the restart and shutdown timers
		activate()
	else
		deactivate()

/datum/nanite_program/proc/on_mob_remove()
	return

/datum/nanite_program/proc/toggle()
	if(!activated)
		activate()
	else
		deactivate()

/datum/nanite_program/proc/activate()
	activated = TRUE
	if(timer_shutdown)
		timer_shutdown_next = world.time + timer_shutdown

/datum/nanite_program/proc/deactivate()
	if(passive_enabled)
		disable_passive_effect()
	activated = FALSE
	if(timer_restart)
		timer_restart_next = world.time + timer_restart

/datum/nanite_program/proc/on_process()
	if(!activated)
		if(timer_restart_next && world.time > timer_restart_next)
			activate()
			timer_restart_next = 0
		return

	if(timer_shutdown_next && world.time > timer_shutdown_next)
		deactivate()
		timer_shutdown_next = 0
		return

	if(timer_trigger && world.time > timer_trigger_next)
		trigger()
		timer_trigger_next = world.time + timer_trigger
		return

	if(timer_trigger_delay_next && world.time > timer_trigger_delay_next)
		trigger(delayed = TRUE)
		timer_trigger_delay_next = 0
		return

	if(check_conditions() && consume_nanites(use_rate))
		if(!passive_enabled)
			enable_passive_effect()
		active_effect()
	else
		if(passive_enabled)
			disable_passive_effect()

//If false, disables active, passive effects, and triggers without consuming nanites
//Can be used to avoid consuming nanites for nothing
/datum/nanite_program/proc/check_conditions()
	if (!LAZYLEN(rules))
		return TRUE
	for(var/R in rules)
		var/datum/nanite_rule/rule = R
		if(!all_rules_required && rule.check_rule())
			return TRUE
		if(all_rules_required && !rule.check_rule())
			return FALSE
	return all_rules_required ? TRUE : FALSE

//Constantly procs as long as the program is active
/datum/nanite_program/proc/active_effect()
	return

//Procs once when the program activates
/datum/nanite_program/proc/enable_passive_effect()
	passive_enabled = TRUE

//Procs once when the program deactivates
/datum/nanite_program/proc/disable_passive_effect()
	passive_enabled = FALSE

//Checks conditions then fires the nanite trigger effect
/datum/nanite_program/proc/trigger(delayed = FALSE, comm_message)
	if(!can_trigger)
		return
	if(!activated)
		return
	if(timer_trigger_delay && !delayed)
		timer_trigger_delay_next = world.time + timer_trigger_delay
		return
	if(world.time < next_trigger)
		return
	if(!check_conditions())
		return
	if(!consume_nanites(trigger_cost))
		return
	next_trigger = world.time + trigger_cooldown
	on_trigger(comm_message)

//Nanite trigger effect, requires can_trigger to be used
/datum/nanite_program/proc/on_trigger(comm_message)
	return

/datum/nanite_program/proc/consume_nanites(amount, force = FALSE)
	return nanites.consume_nanites(amount, force)

/datum/nanite_program/proc/on_emp(severity)
	if(program_flags & NANITE_EMP_IMMUNE)
		return
	if(prob(severity / 2))
		host_mob.investigate_log("[src] nanite program received a software error due to emp.", INVESTIGATE_NANITES)
		software_error()

/datum/nanite_program/proc/on_shock(shock_damage)
	if(!(program_flags & NANITE_SHOCK_IMMUNE))
		if(prob(10))
			host_mob.investigate_log("[src] nanite program received a software error due to shock.", INVESTIGATE_NANITES)
			software_error()
		else if(prob(33))
			host_mob.investigate_log("[src] nanite program was deleted due to shock.", INVESTIGATE_NANITES)
			self_destruct()

/datum/nanite_program/proc/on_minor_shock()
	if(!(program_flags & NANITE_SHOCK_IMMUNE))
		if(prob(10))
			host_mob.investigate_log("[src] nanite program received a software error due to minor shock.", INVESTIGATE_NANITES)
			software_error()

/datum/nanite_program/proc/on_death()
	return

/datum/nanite_program/proc/software_error(type)
	if(!type)
		type = rand(1,is_permanent()? 4 : 5)
	switch(type)
		if(1)
			host_mob.investigate_log("[src] nanite program was deleted by software error.", INVESTIGATE_NANITES)
			self_destruct() //kill switch
			return
		if(2) //deprogram codes
			if(corruptable)
				host_mob.investigate_log("[src] nanite program was de-programmed by software error.", INVESTIGATE_NANITES)
				activation_code = 0
				deactivation_code = 0
				kill_code = 0
				trigger_code = 0
		if(3)
			if(error_flicking)
				toggle() //enable/disable
				host_mob.investigate_log("[src] nanite program was toggled by software error.", INVESTIGATE_NANITES)
		if(4)
			if(error_flicking && can_trigger)
				host_mob.investigate_log("[src] nanite program was triggered by software error.", INVESTIGATE_NANITES)
				trigger()
		if(5) //Program is scrambled and does something different
			if(corruptable)
				var/rogue_type = pick(rogue_types)
				var/datum/nanite_program/rogue = new rogue_type
				host_mob.investigate_log("[src] nanite program was converted into [rogue.name] by software error.", INVESTIGATE_NANITES)
				nanites.add_program(null, rogue, src)
				self_destruct()

/datum/nanite_program/proc/receive_signal(code, source)
	if(activation_code && code == activation_code && !activated)
		activate()
		host_mob.investigate_log("'s [name] nanite program was activated by [source] with code [code].", INVESTIGATE_NANITES)
	else if(deactivation_code && code == deactivation_code && activated)
		deactivate()
		host_mob.investigate_log("'s [name] nanite program was deactivated by [source] with code [code].", INVESTIGATE_NANITES)
	if(can_trigger && trigger_code && code == trigger_code)
		trigger()
		host_mob.investigate_log("'s [name] nanite program was triggered by [source] with code [code].", INVESTIGATE_NANITES)
	if((kill_code && code == kill_code) && !is_permanent())
		host_mob.investigate_log("'s [name] nanite program was deleted by [source] with code [code].", INVESTIGATE_NANITES)
		qdel(src)

/**
  * Attempts to destroy ourselves
  */
/datum/nanite_program/proc/self_destruct()
	if(is_permanent())
		return
	qdel(src)
///A nanite program containing a behaviour protocol. Only one protocol of each class can be active at once.
/datum/nanite_program/protocol
	name = "Nanite Protocol"
	var/protocol_class = NONE

/datum/nanite_program/protocol/check_conditions()
	. = ..()
	for(var/protocol in nanites.protocols)
		var/datum/nanite_program/protocol/P = protocol
		if(P != src && P.activated && P.protocol_class == protocol_class)
			return FALSE

/datum/nanite_program/protocol/on_add(datum/component/nanites/_nanites)
	..()
	nanites.protocols += src

/datum/nanite_program/protocol/Destroy()
	if(nanites)
		nanites.protocols -= src
	return ..()