Polaris/code/modules/projectiles/projectile/pellets.dm

//For projectiles that actually represent clouds of projectiles
/obj/item/projectile/bullet/pellet
	name = "shrapnel" //'shrapnel' sounds more dangerous (i.e. cooler) than 'pellet'
	damage = 20
	//icon_state = "bullet" //TODO: would be nice to have it's own icon state
	var/pellets = 4			//number of pellets
	var/range_step = 2		//projectile will lose a fragment each time it travels this distance. Can be a non-integer.
	var/base_spread = 90	//lower means the pellets spread more across body parts. If zero then this is considered a shrapnel explosion instead of a shrapnel cone
	var/spread_step = 10	//higher means the pellets spread more across body parts with distance

/obj/item/projectile/bullet/pellet/Bumped()
	. = ..()
	bumped = 0 //can hit all mobs in a tile. pellets is decremented inside attack_mob so this should be fine.

/obj/item/projectile/bullet/pellet/proc/get_pellets(var/distance)
	var/pellet_loss = round((distance - 1)/range_step) //pellets lost due to distance
	return max(pellets - pellet_loss, 1)

/obj/item/projectile/bullet/pellet/attack_mob(var/mob/living/target_mob, var/distance, var/miss_modifier)
	if (pellets < 0) return 1

	var/total_pellets = get_pellets(distance)
	var/spread = max(base_spread - (spread_step*distance), 0)

	//shrapnel explosions miss prone mobs with a chance that increases with distance
	var/prone_chance = 0
	if(!base_spread)
		prone_chance = max(spread_step*(distance - 2), 0)

	var/hits = 0
	for (var/i in 1 to total_pellets)
		if(target_mob.lying && target_mob != original && prob(prone_chance))
			continue

		//pellet hits spread out across different zones, but 'aim at' the targeted zone with higher probability
		//whether the pellet actually hits the def_zone or a different zone should still be determined by the parent using get_zone_with_miss_chance().
		var/old_zone = def_zone
		def_zone = ran_zone(def_zone, spread)
		if (..()) hits++
		def_zone = old_zone //restore the original zone the projectile was aimed at

	pellets -= hits //each hit reduces the number of pellets left
	if (hits >= total_pellets || pellets <= 0)
		return 1
	return 0

/obj/item/projectile/bullet/pellet/get_structure_damage()
	var/distance = get_dist(loc, starting)
	return ..() * get_pellets(distance)

/obj/item/projectile/bullet/pellet/Move()
	. = ..()

	//If this is a shrapnel explosion, allow mobs that are prone to get hit, too
	if(. && !base_spread && isturf(loc))
		for(var/mob/living/M in loc)
			if(M.lying || !M.CanPass(src, loc)) //Bump if lying or if we would normally Bump.
				if(Bump(M)) //Bump will make sure we don't hit a mob multiple times
					return

//Explosive grenade projectile, borrowed from fragmentation grenade code.
/obj/item/projectile/bullet/pellet/fragment
	damage = 10
	armor_penetration = 30
	range_step = 2 //projectiles lose a fragment each time they travel this distance. Can be a non-integer.

	base_spread = 0 //causes it to be treated as a shrapnel explosion instead of cone
	spread_step = 20

	silenced = 1 //embedding messages are still produced so it's kind of weird when enabled.
	no_attack_log = 1
	muzzle_type = null

/obj/item/projectile/bullet/pellet/fragment/strong
	damage = 15
	armor_penetration = 20

/obj/item/projectile/bullet/pellet/fragment/weak
	damage = 4
	armor_penetration = 40

// Tank rupture fragments
/obj/item/projectile/bullet/pellet/fragment/tank
	name = "metal fragment"
	damage = 9  //Big chunks flying off.
	range_step = 2 //controls damage falloff with distance. projectiles lose a "pellet" each time they travel this distance. Can be a non-integer.

	base_spread = 0 //causes it to be treated as a shrapnel explosion instead of cone
	spread_step = 20

	armor_penetration = 20

	silenced = 1
	no_attack_log = 1
	muzzle_type = null
	pellets = 3

/obj/item/projectile/bullet/pellet/fragment/tank/small
	name = "small metal fragment"
	damage = 6
	armor_penetration = 5
	pellets = 5

/obj/item/projectile/bullet/pellet/fragment/tank/big
	name = "large metal fragment"
	damage = 17
	armor_penetration = 10
	range_step = 5 //controls damage falloff with distance. projectiles lose a "pellet" each time they travel this distance. Can be a non-integer.
	pellets = 1