/**
 * Defines a firing mode for a gun.
 *
 * A firemode is created from a list of fire mode settings. Each setting modifies the value of the gun var with the same name.
 * If the fire mode value for a setting is null, it will be replaced with the initial value of that gun's variable when the firemode is created.
 * Obviously not compatible with variables that take a null value. If a setting is not present, then the corresponding var will not be modified.
 */
/datum/firemode
	var/name = "default"
	var/list/settings = list()
	var/list/original_settings

/datum/firemode/New(obj/item/gun/gun, list/properties = null)
	..()
	if(!properties) return

	for(var/propname in properties)
		var/propvalue = properties[propname]

		if(propname == "mode_name")
			name = propvalue
		else if(isnull(propvalue))
			settings[propname] = gun.vars[propname] //better than initial() as it handles list vars like burst_accuracy
		else
			settings[propname] = propvalue

/datum/firemode/proc/apply_to(obj/item/gun/gun)
	LAZYINITLIST(original_settings)

	for(var/propname in settings)
		original_settings[propname] = gun.vars[propname]
		gun.vars[propname] = settings[propname]

/datum/firemode/proc/unapply_to(obj/item/gun/gun)
	if (LAZYLEN(original_settings))
		for (var/propname in original_settings)
			gun.vars[propname] = original_settings[propname]

		LAZYCLEARLIST(original_settings)
		original_settings = null

/// Parent gun type. Guns are weapons that can be aimed at mobs and act over a distance.
/obj/item/gun
	name = "gun"
	desc = "It's a gun. It's pretty terrible, though."
	icon = 'icons/obj/guns/pistol.dmi'
	var/gun_gui_icons = 'icons/obj/guns/gun_gui.dmi'
	icon_state = "pistol"
	item_state = "pistol"
	contained_sprite = TRUE
	obj_flags = OBJ_FLAG_CONDUCTABLE
	slot_flags = SLOT_BELT|SLOT_HOLSTER
	matter = list(DEFAULT_WALL_MATERIAL = 2000)
	w_class = WEIGHT_CLASS_NORMAL
	throwforce = 5
	throw_speed = 4
	throw_range = 5
	force = 11
	origin_tech = list(TECH_COMBAT = 1)
	attack_verb = list("struck", "hit", "bashed")
	zoomdevicename = "scope"
	light_system = DIRECTIONAL_LIGHT

/*
 * Suppression vars
 */

	/// Does the gun have a suppressor attached, or should it be suppressed? This will modify firing messages to obscure their source, and change the firing sound to use suppressed_sound
	var/suppressed = FALSE
	/// The suppressor item currently attached to the gun
	var/obj/item/suppressor/suppressor
	/// Whether the weapon can have a suppressor attached
	var/can_suppress = FALSE
	/// Whether the weapon can have a suppressor unattached
	var/can_unsuppress = TRUE

/*
 * Sound vars
 */

	/// Sound of the gun firing.
	var/fire_sound = 'sound/weapons/gunshot/gunshot1.ogg'
	/// Whether to vary the frequency of the firing sound.
	var/vary_fire_sound = TRUE
	/// The volume of the firing sound.
	var/fire_sound_volume = 50
	///Sound of the gun firing when empty (dryfiring).
	var/empty_sound = SFX_OUT_OF_AMMO
	///Determines what a player should hear in audible_message when the gun is fired. e.g gunshot, blast.
	var/fire_sound_text = "gunshot"
	/// The firing sound to play when suppressed = TRUE.
	var/suppressed_sound = 'sound/weapons/gunshot/gunshot_suppressed.ogg'
	/// The volume of the suppressed sound.
	var/suppressed_volume = 60
	/// The sound of the safety being turned on.
	var/safetyon_sound = 'sound/weapons/blade_open.ogg'
	/// The sound of the safety being turned off.
	var/safetyoff_sound = 'sound/weapons/blade_close.ogg'
	drop_sound = 'sound/items/drop/gun.ogg'
	pickup_sound = 'sound/items/pickup/gun.ogg'

	var/burst = 1
	var/can_autofire = FALSE
	/// Delay after shooting before the gun can be used again
	var/fire_delay = 6
	/// Delay between shots, if firing in bursts
	var/burst_delay = 1
	var/move_delay = 0

	/// Screen shake.
	var/recoil = 0
	var/muzzle_flash = 3
	/// Accuracy is measured in tiles. +1 accuracy means that everything is effectively one tile closer for the purpose of miss chance, -1 means the opposite. launchers are not supported, at the moment.
	var/accuracy = 0
	/// The higher this number, the more accurate this weapon is when fired from the off-hand.
	var/offhand_accuracy = 0
	var/scoped_accuracy = null
	/// Allows for different accuracies for each shot in a burst. Applied on top of accuracy.
	var/list/burst_accuracy = list(0)
	var/list/dispersion = list(0)
	/// The weapon's reliability; impacts probability rolls for misfires/failures of different sorts. As of 2025/11, only implemented for science modular weapons.
	var/reliability = 100

	/// Standard firing pin for most guns.
	var/obj/item/firing_pin/pin = /obj/item/firing_pin

	var/cyborg_maptext_override
	var/displays_maptext = FALSE
	/// If this weapon can have an ammo display attached.
	var/can_ammo_display = TRUE
	/// The ammo display attached to this weapon.
	var/obj/item/ammo_display
	maptext_x = 22
	maptext_y = 2

	/// If this weapon can have a bayonet attached.
	var/can_bayonet = FALSE
	/// The bayonet attached to this weapon.
	var/obj/item/material/knife/bayonet/bayonet
	var/knife_x_offset = 0
	var/knife_y_offset = 0

	var/next_fire_time = 0

	/// Index of the currently selected mode.
	var/sel_mode = 1
	var/list/firemodes = list()

	/// For marking kills with a knife.
	var/markings = 0

	// Wielding information
	var/fire_delay_wielded
	var/recoil_wielded
	var/accuracy_wielded
	var/wielded = 0
	var/needspin = TRUE
	/// Can this weapon be dual-wielded?
	var/is_wieldable = FALSE
	var/wield_sound = SFX_WIELD
	var/unwield_sound = null
	/// Additional accuracy/dispersion penalty for using full auto one-handed
	var/one_hand_fa_penalty = 0

	// Aiming system stuff
	/// Can this gun target multiple people?
	var/multi_aim = 0
	/// List of who is being targeted.
	var/tmp/list/mob/living/aim_targets
	/// Used to fire faster at more than one person.
	var/tmp/mob/living/last_moved_mob
	var/tmp/lock_time = -100

	/// Whether or not the gun has a safety.
	var/has_safety = TRUE
	/// Whether the gun's safety is currently engaged.
	var/safety_state = TRUE
	var/image/safety_overlay

	/// If TRUE, applies the user's ID iff_faction to the projectile. As of 2025/11, code making use of this is not currently implemented.
	var/iff_capable = FALSE

/obj/item/gun/mechanics_hints(mob/user, distance, is_adjacent)
	. += ..()
	if(has_safety)
		. += "To fire, toggle the safety with CTRL-click (or enable HARM intent), then click where you want to shoot."
	else
		. += "To fire, because this weapon has no safety, just click where you want to shoot."
	if(is_wieldable)
		. += "This weapon can be wielded with two hands to improve firing stability; use it on yourself while your inactive hand is empty to wield it."
	. += "Use an object with a sharp edge, like a knife, to carve a notch into this."

/obj/item/gun/assembly_hints(mob/user, distance, is_adjacent)
	. += ..()
	if(can_bayonet && !bayonet)
		. += "This weapon can support the attachment of a bayonet."
	if(can_ammo_display && !ammo_display)
		. += "This weapon can support the attachment of an ammo display."

/obj/item/gun/disassembly_hints(mob/user, distance, is_adjacent)
	. += ..()
	if(bayonet)
		. += "The bayonet can be removed from this weapon with a crowbar."
	if(ammo_display)
		. += "The ammo display can be removed from this weapon with a wrench."
	if(pin)
		. += "The firing pin can be removed from this weapon with a screwdriver. Most firing pins are rather fragile, and this has a chance of breaking it!"

/obj/item/gun/feedback_hints(mob/user, distance, is_adjacent)
	. += ..()
	if(distance > 1)
		return
	if(markings)
		. += SPAN_NOTICE("It has [markings] [markings == 1 ? "notch" : "notches"] carved into the stock.")
	if(needspin)
		if(pin)
			. += "\The [pin] is installed in the trigger mechanism."
			pin.examine_info(user) // Allows people to check the current firemode of their wireless-control firing pin. Returns nothing if there's no wireless-control firing pin.
		else
			. += "It doesn't have a firing pin installed, and won't fire."
	if(firemodes.len > 1)
		var/datum/firemode/current_mode = firemodes[sel_mode]
		. += "The fire selector is set to [current_mode.name]."
	if(has_safety)
		. += "The safety is [safety() ? "on" : "off"]."

/obj/item/gun/Initialize(mapload)
	. = ..()
	for(var/i in 1 to firemodes.len)
		firemodes[i] = new /datum/firemode(src, firemodes[i])

	if(isnull(scoped_accuracy))
		scoped_accuracy = accuracy

	if (needspin)
		if(!pin)
			pin = /obj/item/firing_pin
		pin = new pin(src)
	else
		pin = null

	if(istype(loc, /obj/item/robot_module))
		has_safety = FALSE
		if(!cyborg_maptext_override)
			displays_maptext = TRUE
		update_maptext()

	if(istype(loc, /obj/item/rig_module))
		has_safety = FALSE

	queue_icon_update()

/obj/item/gun/should_equip()
	return TRUE

/obj/item/gun/update_icon()
	..()
	underlays.Cut()
	if(bayonet)
		var/image/I
		I = image(icon = 'icons/obj/guns/bayonet.dmi', icon_state = "bayonet")
		I.pixel_x = knife_x_offset
		I.pixel_y = knife_y_offset
		underlays += I

	if(has_safety)
		CutOverlays(safety_overlay, ATOM_ICON_CACHE_PROTECTED)
		safety_overlay = null
		if(!isturf(loc)) // In a mob, holster or bag or something
			safety_overlay = image(gun_gui_icons,"[safety()]")
			AddOverlays(safety_overlay, ATOM_ICON_CACHE_PROTECTED)

	if(is_wieldable)
		if(wielded)
			var/list/gun_states = icon_states(icon)
			if(("[item_state]-wielded_lh" in gun_states) || ("[item_state]-wielded_rh" in gun_states))
				item_state = "[item_state]-wielded"
		else
			item_state = replacetext(item_state,"-wielded","")

	update_held_icon()

/obj/item/gun/can_swap_hands(mob/user)
	if(wielded)
		unwield()
		var/obj/item/offhand/O = user.get_inactive_hand()
		if(istype(O))
			O.unwield()
	return ..()

/obj/item/gun/proc/unique_action(var/mob/user)
	return

/obj/item/gun/proc/toggle_firing_mode(var/mob/user, var/list/message_mobs)
	var/datum/firemode/new_mode = switch_firemodes(user)
	if(new_mode)
		playsound(user, safetyoff_sound, 25)
		to_chat(user, SPAN_NOTICE("\The [src] is now set to [new_mode.name]."))
		update_firing_delays()
	for(var/M in message_mobs)
		to_chat(M, SPAN_NOTICE("[user] has set \the [src] to [new_mode.name]."))

//Checks whether a given mob can use the gun
//Any checks that shouldn't result in handle_click_empty() being called if they fail should go here.
//Otherwise, if you want handle_click_empty() to be called, check in consume_next_projectile() and return null there.
/obj/item/gun/proc/special_check(var/mob/user)
	if(!isliving(user))
		return FALSE
	if(!user.IsAdvancedToolUser())
		return FALSE

	if(user.is_pacified())
		to_chat(user, SPAN_NOTICE("You don't want to risk harming anyone!"))
		return FALSE

	var/mob/living/M = user

	if((M.mutations & HULK))
		to_chat(M, SPAN_DANGER("Your fingers are much too large for the trigger guard!"))
		return FALSE

	if(ishuman(M))
		var/mob/living/carbon/human/A = M
		var/no_guns_check = A.check_no_guns()
		if(no_guns_check)
			to_chat(A, SPAN_WARNING("[no_guns_check]")) // the proc returns the no_guns_message
			return FALSE
		if(A.species && !A.species.can_use_guns())
			return FALSE
	if((M.is_clumsy()) && prob(40)) //Clumsy handling
		var/obj/P = consume_next_projectile()
		if(P)
			if(process_projectile(P, user, user, pick(BP_L_FOOT, BP_R_FOOT)))
				handle_post_fire(user, user)
				user.visible_message(
					SPAN_DANGER("\The [user] shoots [user.get_pronoun("himself")] in the foot with \the [src]!"),
					SPAN_DANGER("You shoot yourself in the foot with \the [src]!")
					)
				M.drop_item()
		else
			handle_click_empty(user)
		return FALSE

	if(pin && needspin)
		if(pin.pin_auth(user) || pin.emagged)
			return TRUE
		else
			pin.auth_fail(user)
			handle_click_empty(user)
			return FALSE
	else
		if(needspin)
			to_chat(user, SPAN_WARNING("\The [src]'s trigger is locked. This weapon doesn't have a firing pin installed!"))
			balloon_alert(user, "trigger locked, firing pin needed!")
			return FALSE
		else
			return TRUE

/obj/item/gun/afterattack(atom/A, mob/living/user, adjacent, params)
	if(adjacent) return //A is adjacent, is the user, or is on the user's person

	if(!user.aiming)
		user.aiming = new(user)

	if(user?.client && user.aiming?.active && user.aiming.aiming_at != A)
		PreFire(A,user,params) //They're using the new gun system, locate what they're aiming at.
		return
	else
		Fire(A,user,params) //Otherwise, fire normally.

/obj/item/gun/attack(mob/living/target_mob, mob/living/user, target_zone)
	if (target_mob == user && user.zone_sel.selecting == BP_MOUTH && !mouthshoot)
		handle_suicide(user)
	else if(user.a_intent != I_HURT && user.aiming && user.aiming.active) //if aim mode, don't pistol whip
		if (user.aiming.aiming_at != target_mob)
			PreFire(target_mob, user)
		else
			Fire(target_mob, user, pointblank=1)
	else if(user.a_intent == I_HURT) //point blank shooting
		Fire(target_mob, user, pointblank=1)
	else if(bayonet)
		bayonet.attack(target_mob, user, target_zone)
	else
		return ..() //Pistolwhippin'

/obj/item/gun/proc/get_appropriate_delay()
	var/fire_time = burst > 1 ? ((burst - 1) * burst_delay) : fire_delay
	var/appropriate_delay = burst > 1 ? burst_delay : fire_delay
	var/shoot_time = max(fire_time, appropriate_delay)
	return shoot_time

/**
 * Attempts to fire the weapon. This does several things, namely:
 * * Adds fingerprints to the weapon.
 * * Checks for the safety's engagement.
 * * Runs reliability checks, and executes any custom-coded failure events.
 * * Fire time checks to avoid spam, as well as handling shoot delay.
 * * Makes the user face their target (duh).
 */
/obj/item/gun/proc/fire_checks(atom/target, mob/living/user, clickparams, pointblank=0, reflex=0)
	if(!user || !target)
		return FALSE

	add_fingerprint(user)

	if(safety())
		if(user.a_intent == I_HURT)
			toggle_safety(user)
		else
			handle_click_empty(user)
			return FALSE

	if(!special_check(user))
		return FALSE

	var/failure_chance = 100 - reliability
	if(prob(failure_chance))
		handle_reliability_fail(user)
		return FALSE

	if(world.time < next_fire_time)
		if(world.time % 3 && !can_autofire) //to prevent spam
			to_chat(user, SPAN_WARNING("\The [src] is not ready to fire again!"))
		return FALSE

	var/shoot_time = get_appropriate_delay()
	user.setClickCooldown(shoot_time)
	next_fire_time = world.time + shoot_time

	user.face_atom(target, TRUE)

	return TRUE

/obj/item/gun/proc/Fire(atom/target, mob/living/user, clickparams, pointblank=0, reflex=0, accuracy_decrease=0, is_offhand=0)
	if(!fire_checks(target,user,clickparams,pointblank,reflex))
		return FALSE

	if(!is_offhand && user.a_intent == I_HURT) // no recursion
		var/obj/item/gun/SG = user.get_inactive_hand()
		if(istype(SG) && SG.w_class <= w_class)
			var/decreased_accuracy = SG.w_class - SG.offhand_accuracy
			addtimer(CALLBACK(SG, PROC_REF(Fire), target, user, clickparams, pointblank, reflex, decreased_accuracy, TRUE), 1)

	//actually attempt to shoot
	var/turf/targloc = get_turf(target) //cache this in case target gets deleted during shooting, e.g. if it was a securitron that got destroyed.
	for(var/i in 1 to burst)
		var/obj/projectile = consume_next_projectile(user)
		if(!projectile)
			handle_click_empty(user)
			break

		var/acc = burst_accuracy[min(i, burst_accuracy.len)] - accuracy_decrease
		var/disp = dispersion[min(i, dispersion.len)]
		process_accuracy(projectile, user, target, acc, disp)

		if(pointblank)
			process_point_blank(projectile, user, target)

		var/selected_zone = user.zone_sel ? user.zone_sel.selecting : BP_CHEST
		if(process_projectile(projectile, user, target, selected_zone, clickparams))
			var/show_emote = TRUE
			if(i > 1 && burst_delay < 3 && burst < 5)
				show_emote = FALSE
			handle_post_fire(user, target, pointblank, reflex, show_emote)
			update_icon()

		if(i < burst)
			sleep(burst_delay)

		if(!(target && target.loc))
			target = targloc
			pointblank = 0

	update_held_icon()

	// Custom formula here because otherwise you can fire bursts within the burst.
	var/shoot_time = burst > 1 ? burst_delay + 1 : fire_delay
	user.setClickCooldown(shoot_time)

/// Similar to the Fire() proc, but does not require a user, which is ideal for things like turrets.
/obj/item/gun/proc/Fire_userless(atom/target)
	if(!target)
		return FALSE

	if(world.time < next_fire_time)
		return FALSE

	var/shoot_time = get_appropriate_delay()
	next_fire_time = world.time + shoot_time

	var/turf/targloc = get_turf(target) //cache this in case target gets deleted during shooting, e.g. if it was a securitron that got destroyed.
	for(var/i in 1 to burst)
		var/obj/projectile = consume_next_projectile()
		if(!projectile)
			handle_click_empty()
			break

		if(isprojectile(projectile))
			var/obj/projectile/P = projectile

			var/acc = burst_accuracy[min(i, burst_accuracy.len)]
			var/disp = dispersion[min(i, dispersion.len)]

			P.accuracy = accuracy + acc
			P.spread += disp

			P.suppressed =  suppressed

			P.preparePixelProjectile(target, get_turf(src))
			P.fired_from = src
			P.fire()

			handle_post_fire() // should be safe to not include arguments here, as there are failsafes in effect (?)

			var/prev_light = light_range
			if (muzzle_flash)
				set_light_range(muzzle_flash)
				set_light_on(TRUE)
				addtimer(CALLBACK(src, PROC_REF(reset_light_range), prev_light), 0.5 SECONDS)
			update_icon()

		if(i < burst)
			sleep(burst_delay)

		if(!target?.loc)
			target = targloc

	//update timing
	next_fire_time = world.time + shoot_time

	accuracy = initial(accuracy)	//Reset the gun's accuracy

/// called by a timer to remove the light range from muzzle flash
/obj/item/gun/proc/reset_light_range(lightrange)
	set_light_range(lightrange)
	if(lightrange <= 0)
		set_light_on(FALSE)

//obtains the next projectile to fire
/obj/item/gun/proc/consume_next_projectile()
	return null

//used by aiming code
/obj/item/gun/proc/can_hit(atom/target, var/mob/living/user)
	if(!special_check(user))
		return 2
	//just assume we can shoot through glass and stuff. No big deal, the player can just choose to not target someone
	//on the other side of a window if it makes a difference. Or if they run behind a window, too bad.
	return (target in check_trajectory(target, user))

//called if there was no projectile to shoot
/obj/item/gun/proc/handle_click_empty(mob/user)
	balloon_alert_to_viewers("*click*")
	playsound(loc, empty_sound, 30, TRUE)
	if(user)
		SEND_SIGNAL(user, COMSIG_EMPTIED_MAGAZINE, src)

//called after successfully firing
/obj/item/gun/proc/handle_post_fire(mob/user, atom/target, var/pointblank = FALSE, var/reflex = FALSE, var/playemote = TRUE)
	play_fire_sound()
	if(!suppressed)
		if(playemote)
			if(reflex)
				user.visible_message(
					SPAN_DANGER("<b>\The [user] fires \the [src][pointblank ? " point blank at [target]" : ""] by reflex!</b>"),
					SPAN_DANGER("You fire \the [src][pointblank ? " point blank at [target]" : ""] by reflex!"),
					"You hear a [fire_sound_text]!"
				)
			else
				user.visible_message(
					SPAN_DANGER("\The [user] fires \the [src][pointblank ? " point blank at [target]" : ""]!"),
					SPAN_DANGER("You fire \the [src][pointblank ? " point blank at [target]" : ""]!"),
					"You hear a [fire_sound_text]!"
				)

		if(muzzle_flash)
			var/prev_light = light_range
			if (muzzle_flash)
				set_light_range(muzzle_flash)
				set_light_on(TRUE)
				addtimer(CALLBACK(src, PROC_REF(reset_light_range), prev_light), 0.5 SECONDS)

	if(recoil)
		shake_camera(user, recoil + 1, recoil)

	if(ishuman(user) && user.invisibility == INVISIBILITY_LEVEL_TWO) //shooting will disable a rig cloaking device
		var/mob/living/carbon/human/H = user
		if(istype(H.back, /obj/item/rig))
			var/obj/item/rig/R = H.back
			for(var/obj/item/rig_module/stealth_field/S in R.installed_modules)
				S.deactivate()
	update_icon()

/obj/item/gun/proc/play_fire_sound()
	if(suppressed)
		playsound(loc, suppressed_sound, suppressed_volume, vary_fire_sound)
	else
		playsound(loc, fire_sound, fire_sound_volume, vary_fire_sound, falloff_distance  = 0.5)

/obj/item/gun/proc/process_point_blank(obj/projectile, mob/user, atom/target)
	var/obj/projectile/P = projectile
	if(!istype(P))
		return //default behaviour only applies to true projectiles

	if(!ismob(target))
		return

	var/mob/M = target
	var/damage_mult = 1
	if(M.incapacitated(INCAPACITATION_ALL))
		damage_mult = 1.3

	//determine multiplier due to the target being grabbed
	if(M.grabbed_by.len)
		var/grabstate = 0
		for(var/obj/item/grab/G in M.grabbed_by)
			grabstate = max(grabstate, G.state)
		if(grabstate >= GRAB_NECK)
			damage_mult = 2.5
	P.damage *= damage_mult
	P.point_blank = TRUE

/obj/item/gun/proc/process_accuracy(obj/projectile, mob/user, atom/target, acc_mod, dispersion)
	var/obj/projectile/P = projectile
	if(!istype(P))
		return //default behaviour only applies to true projectiles

	//Accuracy modifiers
	P.accuracy = accuracy + acc_mod
	P.spread += dispersion

	//Increasing accuracy across the board, ever so slightly
	P.accuracy += 1

	//accuracy bonus from aiming
	if (aim_targets && (target in aim_targets))
		//If you aim at someone beforehead, it'll hit more often.
		//Kinda balanced by fact you need like 2 seconds to aim
		//As opposed to no-delay pew pew
		P.accuracy += 2

	var/datum/firemode/F
	if(length(firemodes))
		F = firemodes[sel_mode]
	if(one_hand_fa_penalty > 2 && !wielded && F?.name == "full auto") // todo: make firemode names defines
		P.accuracy -= one_hand_fa_penalty * 0.5
		P.spread -= one_hand_fa_penalty * 0.5

//does the actual launching of the projectile
/obj/item/gun/proc/process_projectile(obj/projectile, mob/user, atom/target, target_zone, params)
	var/obj/projectile/P = projectile
	if(!istype(P))
		return FALSE //default behaviour only applies to true projectiles

	//shooting while in shock
	var/added_spread = 0
	if(iscarbon(user))
		var/mob/living/carbon/mob = user
		if(mob.shock_stage > 120)
			added_spread = 30
		else if(mob.shock_stage > 70)
			added_spread = 15

	P.preparePixelProjectile(target, src, deviation = added_spread)
	P.firer = user
	P.fired_from = src
	P.def_zone = target_zone

	return !P.fire()

//Suicide handling.
/obj/item/gun/var/mouthshoot = FALSE //To stop people from suiciding twice... >.>
/obj/item/gun/proc/handle_suicide(mob/living/user)
	if(!ishuman(user))
		return
	var/mob/living/carbon/human/M = user

	mouthshoot = TRUE
	M.visible_message(SPAN_DANGER("\The [user] sticks \the [src] in their mouth, their finger ready to pull the trigger..."))
	if(!do_after(user, 4 SECONDS))
		M.visible_message(SPAN_GOOD("\The [user] takes \the [src] out of their mouth."))
		mouthshoot = FALSE
		return
	var/obj/projectile/in_chamber = consume_next_projectile()
	if(istype(in_chamber))
		user.visible_message(SPAN_DANGER("\The [user] pulls the trigger."))
		if (!pin && needspin) // Checks the pin of the gun.
			handle_click_empty(user)
			mouthshoot = FALSE
			return
		if (!pin.pin_auth() && needspin)
			handle_click_empty(user)
			mouthshoot = FALSE
			return
		if(safety() && user.a_intent != I_HURT)
			handle_click_empty(user)
			mouthshoot = FALSE
			return
		play_fire_sound()

		in_chamber.on_hit(M)

		if(in_chamber.damage == 0)
			user.show_message(SPAN_WARNING("You feel rather silly, trying to commit suicide with a toy."))
			mouthshoot = FALSE
			return
		else if(in_chamber.damage_type == DAMAGE_PAIN)
			user.apply_damage(in_chamber.damage * 2, DAMAGE_PAIN, BP_HEAD)
		else
			log_and_message_admins("[key_name(user)] commited suicide using \a [src].")
			user.apply_damage(in_chamber.damage * 20, in_chamber.damage_type, BP_HEAD, used_weapon = "Point blank shot in the mouth with \a [in_chamber]", damage_flags = DAMAGE_FLAG_SHARP)
			user.death()

		handle_post_fire(user, user, FALSE, FALSE, FALSE)
		mouthshoot = FALSE
		return
	else
		handle_click_empty(user)
		mouthshoot = FALSE
		return

/obj/item/gun/proc/toggle_scope(var/zoom_amount=2.0, var/mob/user)
	//looking through a scope limits your periphereal vision
	//still, increase the view size by a tiny amount so that sniping isn't too restricted to NSEW
	var/zoom_offset = round(world.view * zoom_amount)
	var/view_size = round(world.view + zoom_amount)
	var/scoped_accuracy_mod = zoom_offset

	zoom(user, zoom_offset, view_size)
	if(zoom)
		accuracy = scoped_accuracy + scoped_accuracy_mod
		if(recoil)
			recoil = round(recoil*zoom_amount+1) //recoil is worse when looking through a scope

//make sure accuracy and recoil are reset regardless of how the item is unzoomed.
/obj/item/gun/zoom()
	..()
	if(!zoom)
		update_firing_delays()

///Handles removing the suppressor from the gun
/obj/item/gun/proc/clear_suppressor()
	if(!can_unsuppress)
		return
	suppressed = FALSE
	suppressor = null
	update_icon()

/obj/item/gun/proc/switch_firemodes()
	if(!firemodes.len)
		return null

	var/datum/firemode/old_mode = firemodes[sel_mode]
	old_mode.unapply_to(src)

	sel_mode++
	if(sel_mode > firemodes.len)
		sel_mode = 1
	var/datum/firemode/new_mode = firemodes[sel_mode]
	new_mode.apply_to(src)

	return new_mode

/obj/item/gun/attack_self(mob/user)
	if(is_wieldable)
		toggle_wield(usr)
		update_held_icon()
	else
		to_chat(usr, SPAN_WARNING("You can't wield \the [src]!"))

// Safety Procs

/obj/item/gun/proc/toggle_safety(var/mob/user)
	safety_state = !safety_state
	update_icon()
	if(user)
		balloon_alert(user, "safety [safety_state ? "on" : "off"].")
		if(!safety_state)
			playsound(src, safetyon_sound, 30, 1)
		else
			playsound(src, safetyoff_sound, 30, 1)

/obj/item/gun/verb/toggle_safety_verb()
	set src in usr
	set category = "Object.Held"
	set desc = "Shortcut is Ctrl-click."
	set name = "Toggle Gun Safety"
	if(has_safety && usr == loc)
		toggle_safety(usr)

/obj/item/gun/CtrlClick(var/mob/user)
	if(has_safety && !use_check(user, USE_FORCE_SRC_IN_USER))
		toggle_safety(user)
		return TRUE

	. = ..()

/obj/item/gun/proc/safety()
	return has_safety && safety_state

//Handling of rifles and two-handed weapons.
/obj/item/gun/proc/can_wield()
	return FALSE

/obj/item/gun/proc/toggle_wield(mob/user as mob)
	if(!is_wieldable)
		return
	if(!istype(user.get_active_hand(), /obj/item/gun))
		to_chat(user, SPAN_WARNING("You need to be holding \the [name] in your active hand."))
		return
	if(!ishuman(user))
		to_chat(user, SPAN_WARNING("It's too heavy for you to stabilize properly."))
		return

	var/mob/living/carbon/human/M = user
	if(M.isMonkey())
		to_chat(user, SPAN_WARNING("It's too heavy for you to stabilize properly."))
		return

	if(wielded)
		unwield()
		to_chat(user, SPAN_NOTICE("You are no longer stabilizing \the [name] with both hands."))

		var/obj/item/offhand/O = user.get_inactive_hand()
		if(istype(O))
			O.unwield()
	else
		var/obj/item/offhand_item = user.get_inactive_hand()
		if(offhand_item)
			user.unEquip(offhand_item, FALSE, user.loc)
		if(user.get_inactive_hand())
			to_chat(user, SPAN_WARNING("You need your other hand to be empty."))
			return
		wield()
		to_chat(user, SPAN_NOTICE("You stabilize \the [initial(name)] with both hands."))

		var/obj/item/offhand/O = new(user)
		O.name = "[initial(name)] - offhand"
		O.desc = "Your second grip on \the [initial(name)]."
		user.put_in_inactive_hand(O)

	return

/obj/item/gun/proc/unwield()
	wielded = FALSE
	update_firing_delays()

	if(unwield_sound)
		playsound(src.loc, unwield_sound, 50, 1)

	update_icon()
	update_held_icon()


/obj/item/gun/proc/wield()
	wielded = TRUE
	update_firing_delays()

	if(wield_sound)
		playsound(src.loc, wield_sound, 50, 1)

	update_icon()
	update_held_icon()

#define LYING_DOWN_FIRE_DELAY_AND_RECOIL_STAT_MULTIPLIER 0.9 //If the mob is intentionally lying down, apply this as a bonus to the fire delay and recoil
#define LYING_DOWN_ACCURACY_STAT_MULTIPLIER 1.1 //If the mob is intentionally lying down, apply this as a bonus to accuracy

/obj/item/gun/proc/update_firing_delays()
	if(wielded)
		if(!isnull(fire_delay_wielded))
			fire_delay = usr.lying_is_intentional ? (fire_delay_wielded * LYING_DOWN_FIRE_DELAY_AND_RECOIL_STAT_MULTIPLIER) : fire_delay_wielded
		if(!isnull(recoil_wielded))
			recoil = usr.lying_is_intentional ? (recoil_wielded * LYING_DOWN_FIRE_DELAY_AND_RECOIL_STAT_MULTIPLIER) : recoil_wielded
		if(!isnull(accuracy_wielded))
			accuracy = usr.lying_is_intentional ? (accuracy_wielded * LYING_DOWN_ACCURACY_STAT_MULTIPLIER) : accuracy_wielded
	else
		if(!isnull(fire_delay_wielded))
			fire_delay = initial(fire_delay)
		if(!isnull(recoil_wielded))
			recoil = initial(recoil)
		if(!isnull(accuracy_wielded))
			accuracy = initial(accuracy)

#undef LYING_DOWN_FIRE_DELAY_AND_RECOIL_STAT_MULTIPLIER
#undef LYING_DOWN_ACCURACY_STAT_MULTIPLIER

/obj/item/gun/mob_can_equip(mob/user, slot, disable_warning, ignore_blocked)
	//Cannot equip wielded items.
	if(wielded)
		unwield()
		var/obj/item/offhand/O = user.get_inactive_hand()
		if(istype(O))
			O.unwield()
	return ..()

/obj/item/gun/throw_at()
	..()
	update_maptext()

/obj/item/gun/on_give()
	update_maptext()

/obj/item/gun/dropped(mob/user)
	..()

	//Removing the lock and the buttons.
	if(istype(user, /mob/living))
		var/mob/living/living_user = user
		living_user.stop_aiming(src)

	queue_icon_update()
	//Unwields the item when dropped, deletes the offhand
	update_maptext()
	if(is_wieldable)
		if(user)
			var/obj/item/offhand/O = user.get_inactive_hand()
			if(istype(O))
				O.unwield()
		return unwield()

/obj/item/gun/pickup(mob/user)
	..()
	queue_icon_update()
	addtimer(CALLBACK(src, PROC_REF(update_maptext)), 1)
	if(is_wieldable)
		unwield()

///////////OFFHAND///////////////
/obj/item/offhand
	w_class = WEIGHT_CLASS_HUGE
	icon = 'icons/obj/weapons.dmi'
	icon_state = "offhand"
	item_state = "nothing"
	name = "offhand"
	drop_sound = null
	pickup_sound = null
	equip_sound = null

/obj/item/offhand/proc/unwield()
	if(ismob(loc))
		var/mob/the_mob = loc
		the_mob.drop_from_inventory(src)
	else
		qdel(src)

/obj/item/offhand/proc/wield()
	if(ismob(loc))
		var/mob/the_mob = loc
		the_mob.drop_from_inventory(src)
	else
		qdel(src)

/obj/item/offhand/dropped(mob/user)
	. = ..()
	if(user)
		var/obj/item/gun/O = user.get_inactive_hand()
		if(istype(O))
			to_chat(user, SPAN_NOTICE("You are no longer stabilizing \the [O] with both hands."))
			O.unwield()
			unwield()

	if (!QDELETED(src))
		qdel(src)

/obj/item/offhand/mob_can_equip(var/mob/M, slot, disable_warning = FALSE)
	var/static/list/equippable_slots = list(slot_l_hand, slot_r_hand)
	if(slot in equippable_slots)
		return TRUE
	return FALSE

/obj/item/gun/Destroy()
	if (istype(pin))
		QDEL_NULL(pin)
	if(bayonet)
		QDEL_NULL(bayonet)
	if(istype(suppressor))
		QDEL_NULL(suppressor)
	return ..()

/**
 * This proc is only called when a weapon has already hit a failure chance, based on prob(100-reliability) during the fire_checks proc.
 * Based on the weapon's relability value, this proc checks if the severity of the failure exceeds the default (1). It then executes
 * either small_*, medium_*, or critical_fail procs. These are empty returns by default, and must be coded for each weapon/component.
 *
 * As of 2025/11, reliability failures are only implemented for Science's modular weaponry system.
 */
/obj/item/gun/proc/handle_reliability_fail(var/mob/user)
	var/severity = 1
	if(prob(100-reliability))
		severity = 2
		if(prob(100-reliability))
			severity = 3
	switch(severity)
		if(1)
			small_fail(user)
		if(2)
			medium_fail(user)
		else
			critical_fail(user)

/obj/item/gun/proc/small_fail(var/mob/user)
	return

/obj/item/gun/proc/medium_fail(var/mob/user)
	return

/obj/item/gun/proc/critical_fail(var/mob/user)
	return

/obj/item/gun/attackby(obj/item/attacking_item, mob/user)
	if(istype(attacking_item, /obj/item/material/knife/bayonet))
		if(!can_bayonet)
			balloon_alert(user, "doesn't fit!")
			return ..()

		if(bayonet)
			balloon_alert(user, "already has a bayonet!")
			return TRUE

		if(user.l_hand != attacking_item && user.r_hand != attacking_item)
			balloon_alert(user, "not in hand!")
			return

		user.drop_from_inventory(attacking_item,src)
		bayonet = attacking_item
		balloon_alert(user, "[attacking_item.name] attached")
		w_class += attacking_item.w_class
		update_icon()
		return TRUE

	if(istype(pin) && pin.attackby(attacking_item, user)) //Allows users to use their ID on a gun with a wireless-control firing pin to register their identity.
		return TRUE

	if(istype(attacking_item, /obj/item/ammo_display))
		if(!can_ammo_display)
			balloon_alert(user, "doesn't fit!")
			return TRUE

		if(ammo_display)
			balloon_alert(user, "already has an ammo display!")
			return TRUE

		if(user.l_hand != attacking_item && user.r_hand != attacking_item)
			balloon_alert(user, "not in hand!")
			return

		if(displays_maptext)
			balloon_alert(user, "already displaying its ammo count!")
			return TRUE

		user.drop_from_inventory(attacking_item, src)
		ammo_display = attacking_item
		displays_maptext = TRUE
		balloon_alert(user, "[attacking_item.name] attached")
		w_class += attacking_item.w_class
		return TRUE

	if(attacking_item.tool_behaviour == TOOL_CROWBAR && bayonet)
		to_chat(user, SPAN_NOTICE("You detach \the [bayonet] from \the [src]."))
		bayonet.forceMove(get_turf(src))
		user.put_in_hands(bayonet)
		w_class -= bayonet.w_class
		bayonet = null
		update_icon()
		return TRUE

	if(attacking_item.tool_behaviour == TOOL_WRENCH && ammo_display)
		to_chat(user, SPAN_NOTICE("You wrench the ammo display loose from \the [src]."))
		ammo_display.forceMove(get_turf(src))
		user.put_in_hands(ammo_display)
		w_class -= ammo_display.w_class
		ammo_display = null
		displays_maptext = FALSE
		maptext = ""
		return TRUE

	if(pin && attacking_item.tool_behaviour == TOOL_SCREWDRIVER)
		visible_message(SPAN_WARNING("\The [user] begins to try and pry out \the [src]'s firing pin!"))
		if(attacking_item.use_tool(src, user, 45, volume = 50))
			if(pin.durable || prob(50))
				visible_message(SPAN_NOTICE("\The [user] pops \the [pin] out of \the [src]!"))
				pin.forceMove(get_turf(src))
				user.put_in_hands(pin)
				pin = null//clear it out.
			else
				user.visible_message(
				SPAN_WARNING("\The [user] breaks some electronics free from \the [src] with a crack."),
				SPAN_ALERT("You apply a bit too much force to \the [pin], and it breaks in two. Oops."),
				"You hear a metallic crack.")
				qdel(pin)
				pin = null
		return TRUE

	if(is_sharp(attacking_item))
		user.visible_message("<b>[user]</b> carves a notched mark into \the [src].", SPAN_NOTICE("You carve a notched mark into \the [src]."))
		markings++
		return TRUE

	return ..()

/obj/item/gun/proc/get_ammo()
	return 0

//Autofire
/obj/item/gun/proc/can_autofire(object, location, params)
	return (can_autofire && world.time >= next_fire_time)

/// Called when the gun's ammo state changes, checks if it's being held by a mob or in a mob's bag, and then updates the maptext
/obj/item/gun/proc/update_maptext()
	if(displays_maptext)
		if(!ismob(loc) && !ismob(loc.loc))
			maptext = ""
			return
		handle_maptext()


/// Updates the maptext for the gun when a holographic ammo display is attached. Called in update_maptext() in gun.dm
/obj/item/gun/proc/handle_maptext()
	SHOULD_NOT_SLEEP(TRUE)
	var/ammo = get_ammo()
	if(ammo > 9)
		if(ammo < 20)
			maptext_x = 20
		else
			maptext_x = 18
	else
		maptext_x = 22
	maptext = "<span style=\"font-family: 'Small Fonts'; -dm-text-outline: 1 black; font-size: 7px;\">[ammo]</span>"

/obj/item/gun/get_print_info(var/no_clear = TRUE)
	if(no_clear)
		. = ""
	. += "Burst: [burst]<br>"
	. += "Reliability: [reliability]<br>"