Bubberstation/code/modules/projectiles/projectile.dm

/obj/item/projectile
	name = "projectile"
	icon = 'icons/obj/projectiles.dmi'
	icon_state = "bullet"
	density = FALSE
	anchored = TRUE
	flags = ABSTRACT
	pass_flags = PASSTABLE
	mouse_opacity = 0
	hitsound = 'sound/weapons/pierce.ogg'
	var/hitsound_wall = ""

	resistance_flags = LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
	var/def_zone = ""	//Aiming at
	var/mob/firer = null//Who shot it
	var/suppressed = 0	//Attack message
	var/yo = null
	var/xo = null
	var/current = null
	var/atom/original = null // the original target clicked
	var/turf/starting = null // the projectile's starting turf
	var/list/permutated = list() // we've passed through these atoms, don't try to hit them again
	var/paused = FALSE //for suspending the projectile midair
	var/p_x = 16
	var/p_y = 16			// the pixel location of the tile that the player clicked. Default is the center
	var/speed = 0.8			//Amount of deciseconds it takes for projectile to travel
	var/Angle = 0
	var/nondirectional_sprite = FALSE //Set TRUE to prevent projectiles from having their sprites rotated based on firing angle
	var/spread = 0			//amount (in degrees) of projectile spread
	var/legacy = 0			//legacy projectile system
	animate_movement = 0	//Use SLIDE_STEPS in conjunction with legacy
	var/ricochets = 0
	var/ricochets_max = 2
	var/ricochet_chance = 30
	var/ignore_source_check = FALSE

	var/damage = 10
	var/damage_type = BRUTE //BRUTE, BURN, TOX, OXY, CLONE are the only things that should be in here
	var/nodamage = 0 //Determines if the projectile will skip any damage inflictions
	var/flag = "bullet" //Defines what armor to use when it hits things.  Must be set to bullet, laser, energy,or bomb
	var/projectile_type = /obj/item/projectile
	var/range = 50 //This will de-increment every step. When 0, it will delete the projectile.
	var/is_reflectable = FALSE // Can it be reflected or not?
		//Effects
	var/stun = 0
	var/knockdown = 0
	var/unconscious = 0
	var/irradiate = 0
	var/stutter = 0
	var/slur = 0
	var/eyeblur = 0
	var/drowsy = 0
	var/stamina = 0
	var/jitter = 0
	var/forcedodge = 0 //to pass through everything
	var/dismemberment = 0 //The higher the number, the greater the bonus to dismembering. 0 will not dismember at all.
	var/impact_effect_type //what type of impact effect to show when hitting something
	var/log_override = FALSE //is this type spammed enough to not log? (KAs)

/obj/item/projectile/New()
	permutated = list()
	return ..()

/obj/item/projectile/proc/Range()
	range--
	if(range <= 0 && loc)
		on_range()

/obj/item/projectile/proc/on_range() //if we want there to be effects when they reach the end of their range
	qdel(src)

//to get the correct limb (if any) for the projectile hit message
/mob/living/proc/check_limb_hit(hit_zone)
	if(has_limbs)
		return hit_zone

/mob/living/carbon/check_limb_hit(hit_zone)
	if(get_bodypart(hit_zone))
		return hit_zone
	else //when a limb is missing the damage is actually passed to the chest
		return "chest"

/obj/item/projectile/proc/prehit(atom/target)
	return TRUE

/obj/item/projectile/proc/on_hit(atom/target, blocked = FALSE)
	var/turf/target_loca = get_turf(target)
	if(!isliving(target))
		if(impact_effect_type)
			new impact_effect_type(target_loca, target, src)
		return 0
	var/mob/living/L = target
	if(L.buckled && ismob(L.buckled))
		L = L.buckled
	if(blocked != 100) // not completely blocked
		if(damage && L.blood_volume && damage_type == BRUTE)
			var/splatter_dir = dir
			if(starting)
				splatter_dir = get_dir(starting, target_loca)
			if(isalien(L))
				new /obj/effect/temp_visual/dir_setting/bloodsplatter/xenosplatter(target_loca, splatter_dir)
			else
				new /obj/effect/temp_visual/dir_setting/bloodsplatter(target_loca, splatter_dir)
			if(prob(33))
				L.add_splatter_floor(target_loca)
		else if(impact_effect_type)
			new impact_effect_type(target_loca, target, src)

		var/organ_hit_text = ""
		var/limb_hit = L.check_limb_hit(def_zone)//to get the correct message info.
		if(limb_hit)
			organ_hit_text = " in \the [parse_zone(limb_hit)]"
		if(suppressed)
			playsound(loc, hitsound, 5, 1, -1)
			to_chat(L, "<span class='userdanger'>You're shot by \a [src][organ_hit_text]!</span>")
		else
			if(hitsound)
				var/volume = vol_by_damage()
				playsound(loc, hitsound, volume, 1, -1)
			L.visible_message("<span class='danger'>[L] is hit by \a [src][organ_hit_text]!</span>", \
					"<span class='userdanger'>[L] is hit by \a [src][organ_hit_text]!</span>", null, COMBAT_MESSAGE_RANGE)
		L.on_hit(src)

	var/reagent_note
	if(reagents && reagents.reagent_list)
		reagent_note = " REAGENTS:"
		for(var/datum/reagent/R in reagents.reagent_list)
			reagent_note += R.id + " ("
			reagent_note += num2text(R.volume) + ") "

	add_logs(firer, L, "shot", src, reagent_note)
	return L.apply_effects(stun, knockdown, unconscious, irradiate, slur, stutter, eyeblur, drowsy, blocked, stamina, jitter)

/obj/item/projectile/proc/vol_by_damage()
	if(src.damage)
		return Clamp((src.damage) * 0.67, 30, 100)// Multiply projectile damage by 0.67, then clamp the value between 30 and 100
	else
		return 50 //if the projectile doesn't do damage, play its hitsound at 50% volume

/obj/item/projectile/Collide(atom/A)
	if(check_ricochet() && check_ricochet_flag(A) && ricochets < ricochets_max)
		ricochets++
		if(A.handle_ricochet(src))
			ignore_source_check = TRUE
			return FALSE
	if(firer && !ignore_source_check)
		if(A == firer || (A == firer.loc && istype(A, /obj/mecha))) //cannot shoot yourself or your mech
			loc = A.loc
			return FALSE

	var/distance = get_dist(get_turf(A), starting) // Get the distance between the turf shot from and the mob we hit and use that for the calculations.
	def_zone = ran_zone(def_zone, max(100-(7*distance), 5)) //Lower accurancy/longer range tradeoff. 7 is a balanced number to use.

	if(isturf(A) && hitsound_wall)
		var/volume = Clamp(vol_by_damage() + 20, 0, 100)
		if(suppressed)
			volume = 5
		playsound(loc, hitsound_wall, volume, 1, -1)

	var/turf/target_turf = get_turf(A)

	if(!prehit(A))
		if(forcedodge)
			loc = target_turf
		return FALSE
	var/permutation = A.bullet_act(src, def_zone) // searches for return value, could be deleted after run so check A isn't null
	if(permutation == -1 || forcedodge)// the bullet passes through a dense object!
		loc = target_turf
		if(A)
			permutated.Add(A)
		return FALSE
	else
		if(A && A.density && !ismob(A) && !(A.flags & ON_BORDER)) //if we hit a dense non-border obj or dense turf then we also hit one of the mobs on that tile.
			var/list/mobs_list = list()
			for(var/mob/living/L in target_turf)
				mobs_list += L
			if(mobs_list.len)
				var/mob/living/picked_mob = pick(mobs_list)
				if(!prehit(picked_mob))
					return FALSE
				picked_mob.bullet_act(src, def_zone)
	qdel(src)
	return TRUE

/obj/item/projectile/proc/check_ricochet()
	if(prob(ricochet_chance))
		return TRUE
	return FALSE

/obj/item/projectile/proc/check_ricochet_flag(atom/A)
	if(A.flags & CHECK_RICOCHET)
		return TRUE
	return FALSE

/obj/item/projectile/Process_Spacemove(var/movement_dir = 0)
	return 1 //Bullets don't drift in space

/obj/item/projectile/proc/fire(setAngle, atom/direct_target)
	if(!log_override && firer && original)
		add_logs(firer, original, "fired at", src, " [get_area(src)]")
	if(direct_target)
		prehit(direct_target)
		direct_target.bullet_act(src, def_zone)
		qdel(src)
		return
	if(setAngle)
		Angle = setAngle
	var/old_pixel_x = pixel_x
	var/old_pixel_y = pixel_y
	if(!legacy) //new projectiles
		set waitfor = 0
		var/next_run = world.time
		while(loc)
			if(paused)
				next_run = world.time
				sleep(1)
				continue

			if((!( current ) || loc == current))
				current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)

			if(!Angle)
				Angle=round(Get_Angle(src,current))
			if(spread)
				Angle += (rand() - 0.5) * spread
			var/matrix/M = new
			if(!nondirectional_sprite)
				M.Turn(Angle)
			transform = M

			var/Pixel_x=round((sin(Angle)+16*sin(Angle)*2), 1)	//round() is a floor operation when only one argument is supplied, we don't want that here
			var/Pixel_y=round((cos(Angle)+16*cos(Angle)*2), 1)
			var/pixel_x_offset = old_pixel_x + Pixel_x
			var/pixel_y_offset = old_pixel_y + Pixel_y
			var/new_x = x
			var/new_y = y

			while(pixel_x_offset > 16)
				pixel_x_offset -= 32
				old_pixel_x -= 32
				new_x++// x++
			while(pixel_x_offset < -16)
				pixel_x_offset += 32
				old_pixel_x += 32
				new_x--
			while(pixel_y_offset > 16)
				pixel_y_offset -= 32
				old_pixel_y -= 32
				new_y++
			while(pixel_y_offset < -16)
				pixel_y_offset += 32
				old_pixel_y += 32
				new_y--

			pixel_x = old_pixel_x
			pixel_y = old_pixel_y
			step_towards(src, locate(new_x, new_y, z))
			next_run += max(world.tick_lag, speed)
			var/delay = next_run - world.time
			if(delay <= world.tick_lag*2)
				pixel_x = pixel_x_offset
				pixel_y = pixel_y_offset
			else
				animate(src, pixel_x = pixel_x_offset, pixel_y = pixel_y_offset, time = max(1, (delay <= 3 ? delay - 1 : delay)), flags = ANIMATION_END_NOW)
			old_pixel_x = pixel_x_offset
			old_pixel_y = pixel_y_offset

			if(original && (original.layer >= PROJECTILE_HIT_THRESHHOLD_LAYER) || ismob(original))
				if(loc == get_turf(original))
					if(!(original in permutated))
						Collide(original)
			Range()
			if (delay > 0)
				sleep(delay)

	else //old projectile system
		set waitfor = 0
		while(loc)
			if(!paused)
				if((!( current ) || loc == current))
					current = locate(Clamp(x+xo,1,world.maxx),Clamp(y+yo,1,world.maxy),z)
				step_towards(src, current)
				if(original && (original.layer >= PROJECTILE_HIT_THRESHHOLD_LAYER) || ismob(original))
					if(loc == get_turf(original))
						if(!(original in permutated))
							Collide(original)
				Range()
			sleep(config.run_speed * 0.9)

/obj/item/projectile/proc/preparePixelProjectile(atom/target, var/turf/targloc, mob/living/user, params, spread)
	var/turf/curloc = get_turf(user)
	forceMove(get_turf(user))
	starting = get_turf(user)
	current = curloc
	yo = targloc.y - curloc.y
	xo = targloc.x - curloc.x

	var/list/calculated = calculate_projectile_angle_and_pixel_offsets(user, params)
	Angle = calculated[1]
	p_x = calculated[2]
	p_y = calculated[3]

	if(spread)
		src.Angle += spread

/proc/calculate_projectile_angle_and_pixel_offsets(mob/user, params)
	var/list/mouse_control = params2list(params)
	var/p_x = 0
	var/p_y = 0
	var/angle = 0
	if(mouse_control["icon-x"])
		p_x = text2num(mouse_control["icon-x"])
	if(mouse_control["icon-y"])
		p_y = text2num(mouse_control["icon-y"])
	if(mouse_control["screen-loc"])
		//Split screen-loc up into X+Pixel_X and Y+Pixel_Y
		var/list/screen_loc_params = splittext(mouse_control["screen-loc"], ",")

		//Split X+Pixel_X up into list(X, Pixel_X)
		var/list/screen_loc_X = splittext(screen_loc_params[1],":")

		//Split Y+Pixel_Y up into list(Y, Pixel_Y)
		var/list/screen_loc_Y = splittext(screen_loc_params[2],":")
		// to_chat(world, "X: [screen_loc_X[1]] PixelX: [screen_loc_X[2]] / Y: [screen_loc_Y[1]] PixelY: [screen_loc_Y[2]]")
		var/x = text2num(screen_loc_X[1]) * 32 + text2num(screen_loc_X[2]) - 32
		var/y = text2num(screen_loc_Y[1]) * 32 + text2num(screen_loc_Y[2]) - 32

		//Calculate the "resolution" of screen based on client's view and world's icon size. This will work if the user can view more tiles than average.
		var/screenview = (user.client.view * 2 + 1) * world.icon_size //Refer to http://www.byond.com/docs/ref/info.html#/client/var/view for mad maths

		var/ox = round(screenview/2) - user.client.pixel_x //"origin" x
		var/oy = round(screenview/2) - user.client.pixel_y //"origin" y
		// to_chat(world, "Pixel position: [x] [y]")
		angle = Atan2(y - oy, x - ox)
		// to_chat(world, "Angle: [angle]")
	return list(angle, p_x, p_y)

/obj/item/projectile/Crossed(atom/movable/AM) //A mob moving on a tile with a projectile is hit by it.
	..()
	if(isliving(AM) && AM.density && !checkpass(PASSMOB))
		Collide(AM)

/obj/item/projectile/Destroy()
	return ..()

/obj/item/projectile/experience_pressure_difference()
	return