/* This is an attempt to make some easily reusable "particle" type effect, to stop the code
constantly having to be rewritten. An item like the jetpack that uses the ion_trail_follow system, just has one
defined, then set up when it is created with New(). Then this same system can just be reused each time
it needs to create more trails.A beaker could have a steam_trail_follow system set up, then the steam
would spawn and follow the beaker, even if it is carried or thrown.
*/


/obj/effect/effect
	name = "effect"
	icon = 'icons/effects/effects.dmi'
	mouse_opacity = 0
	unacidable = 1//So effect are not targeted by alien acid.
	flags = TABLEPASS

/obj/effect/effect/water
	name = "water"
	icon = 'icons/effects/effects.dmi'
	icon_state = "extinguish"
	var/life = 15.0
	flags = TABLEPASS
	mouse_opacity = 0

/obj/effect/effect/smoke
	name = "smoke"
	icon = 'icons/effects/water.dmi'
	icon_state = "smoke"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 8.0


/obj/effect/effect/water/New()
	..()
	//var/turf/T = src.loc
	//if (istype(T, /turf))
	//	T.firelevel = 0 //TODO: FIX
	spawn( 70 )
		del(src)
		return
	return

/obj/effect/effect/water/Del()
	//var/turf/T = src.loc
	//if (istype(T, /turf))
	//	T.firelevel = 0 //TODO: FIX
	..()
	return

/obj/effect/effect/water/Move(turf/newloc)
	//var/turf/T = src.loc
	//if (istype(T, /turf))
	//	T.firelevel = 0 //TODO: FIX
	if (--src.life < 1)
		//SN src = null
		del(src)
	if(newloc.density)
		return 0
	.=..()

/obj/effect/effect/water/Bump(atom/A)
	if(reagents)
		reagents.reaction(A)
	return ..()


/datum/effect/effect/system
	var/number = 3
	var/cardinals = 0
	var/turf/location
	var/atom/holder
	var/setup = 0

	proc/set_up(n = 3, c = 0, turf/loc)
		if(n > 10)
			n = 10
		number = n
		cardinals = c
		location = loc
		setup = 1

	proc/attach(atom/atom)
		holder = atom

	proc/start()


/////////////////////////////////////////////
// GENERIC STEAM SPREAD SYSTEM

//Usage: set_up(number of bits of steam, use North/South/East/West only, spawn location)
// The attach(atom/atom) proc is optional, and can be called to attach the effect
// to something, like a smoking beaker, so then you can just call start() and the steam
// will always spawn at the items location, even if it's moved.

/* Example:
var/datum/effect/system/steam_spread/steam = new /datum/effect/system/steam_spread() -- creates new system
steam.set_up(5, 0, mob.loc) -- sets up variables
OPTIONAL: steam.attach(mob)
steam.start() -- spawns the effect
*/
/////////////////////////////////////////////
/obj/effect/effect/steam
	name = "steam"
	icon = 'icons/effects/effects.dmi'
	icon_state = "extinguish"
	density = 0

/datum/effect/effect/system/steam_spread

	set_up(n = 3, c = 0, turf/loc)
		if(n > 10)
			n = 10
		number = n
		cardinals = c
		location = loc

	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/steam/steam = new /obj/effect/effect/steam(src.location)
				var/direction
				if(src.cardinals)
					direction = pick(cardinal)
				else
					direction = pick(alldirs)
				for(i=0, i<pick(1,2,3), i++)
					sleep(5)
					step(steam,direction)
				spawn(20)
					del(steam)

/////////////////////////////////////////////
//SPARK SYSTEM (like steam system)
// The attach(atom/atom) proc is optional, and can be called to attach the effect
// to something, like the RCD, so then you can just call start() and the sparks
// will always spawn at the items location.
/////////////////////////////////////////////

/obj/effect/effect/sparks
	name = "sparks"
	icon_state = "sparks"
	var/amount = 6.0
	anchored = 1.0
	mouse_opacity = 0

/obj/effect/effect/sparks/New()
	..()
	playsound(src.loc, "sparks", 100, 1)
	var/turf/T = src.loc
	if (istype(T, /turf))
		T.hotspot_expose(1000,100)
	spawn (100)
		del(src)
	return

/obj/effect/effect/sparks/Del()
	var/turf/T = src.loc
	if (istype(T, /turf))
		T.hotspot_expose(1000,100)
	..()
	return

/obj/effect/effect/sparks/Move()
	..()
	var/turf/T = src.loc
	if (istype(T, /turf))
		T.hotspot_expose(1000,100)
	return

/datum/effect/effect/system/spark_spread
	var/total_sparks = 0 // To stop it being spammed and lagging!

	set_up(n = 3, c = 0, loca)
		if(n > 10)
			n = 10
		number = n
		cardinals = c
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)

	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			if(src.total_sparks > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/sparks/sparks = new /obj/effect/effect/sparks(src.location)
				src.total_sparks++
				var/direction
				if(src.cardinals)
					direction = pick(cardinal)
				else
					direction = pick(alldirs)
				for(i=0, i<pick(1,2,3), i++)
					sleep(5)
					step(sparks,direction)
				spawn(20)
					del(sparks)
					src.total_sparks--



/////////////////////////////////////////////
//// SMOKE SYSTEMS
// direct can be optinally added when set_up, to make the smoke always travel in one direction
// in case you wanted a vent to always smoke north for example
/////////////////////////////////////////////


/obj/effect/effect/harmless_smoke
	name = "smoke"
	icon_state = "smoke"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 6.0
	//Remove this bit to use the old smoke
	icon = 'icons/effects/96x96.dmi'
	pixel_x = -32
	pixel_y = -32

/obj/effect/effect/harmless_smoke/New()
	..()
	spawn (100)
		del(src)
	return

/obj/effect/effect/harmless_smoke/Move()
	..()
	return

/datum/effect/effect/system/harmless_smoke_spread
	var/total_smoke = 0 // To stop it being spammed and lagging!
	var/direction

	set_up(n = 5, c = 0, loca, direct)
		if(n > 10)
			n = 10
		number = n
		cardinals = c
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)
		if(direct)
			direction = direct


	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			if(src.total_smoke > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/harmless_smoke/smoke = new /obj/effect/effect/harmless_smoke(src.location)
				src.total_smoke++
				var/direction = src.direction
				if(!direction)
					if(src.cardinals)
						direction = pick(cardinal)
					else
						direction = pick(alldirs)
				for(i=0, i<pick(0,1,1,1,2,2,2,3), i++)
					sleep(10)
					step(smoke,direction)
				spawn(75+rand(10,30))
					del(smoke)
					src.total_smoke--


/////////////////////////////////////////////
// Bad smoke
/////////////////////////////////////////////

/obj/effect/effect/bad_smoke
	name = "smoke"
	icon_state = "smoke"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 6.0
	//Remove this bit to use the old smoke
	icon = 'icons/effects/96x96.dmi'
	pixel_x = -32
	pixel_y = -32

/obj/effect/effect/bad_smoke/New()
	..()
	spawn (200+rand(10,30))
		del(src)
	return

/obj/effect/effect/bad_smoke/Move()
	..()
	for(var/mob/living/carbon/M in get_turf(src))
		if (M.internal != null && M.wear_mask && (M.wear_mask.flags & MASKINTERNALS))
		else
			M.drop_item()
			M.adjustOxyLoss(1)
			if (M.coughedtime != 1)
				M.coughedtime = 1
				M.emote("cough")
				spawn ( 20 )
					M.coughedtime = 0
	return


/obj/effect/effect/bad_smoke/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
	if(air_group || (height==0)) return 1
	if(istype(mover, /obj/item/projectile/beam))
		var/obj/item/projectile/beam/B = mover
		B.damage = (B.damage/2)
	return 1


/obj/effect/effect/bad_smoke/HasEntered(mob/living/carbon/M as mob )
	..()
	if(istype(M, /mob/living/carbon))
		if (M.internal != null && M.wear_mask && (M.wear_mask.flags & MASKINTERNALS))
			return
		else
			M.drop_item()
			M.adjustOxyLoss(1)
			if (M.coughedtime != 1)
				M.coughedtime = 1
				M.emote("cough")
				spawn ( 20 )
					M.coughedtime = 0
	return

/datum/effect/effect/system/bad_smoke_spread
	var/total_smoke = 0 // To stop it being spammed and lagging!
	var/direction

	set_up(n = 5, c = 0, loca, direct)
		if(n > 20)
			n = 20
		number = n
		cardinals = c
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)
		if(direct)
			direction = direct

	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			if(src.total_smoke > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/bad_smoke/smoke = new /obj/effect/effect/bad_smoke(src.location)
				src.total_smoke++
				var/direction = src.direction
				if(!direction)
					if(src.cardinals)
						direction = pick(cardinal)
					else
						direction = pick(alldirs)
				for(i=0, i<pick(0,1,1,1,2,2,2,3), i++)
					sleep(10)
					step(smoke,direction)
				spawn(150+rand(10,30))
					del(smoke)
					src.total_smoke--


/////////////////////////////////////////////
// Chem smoke
/////////////////////////////////////////////


/obj/effect/effect/chem_smoke
	name = "smoke"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 6.0

	icon = 'icons/effects/chemsmoke.dmi'
	pixel_x = -32
	pixel_y = -32

/obj/effect/effect/chem_smoke/New()
	..()
	var/datum/reagents/R = new/datum/reagents(500)
	reagents = R
	R.my_atom = src

	spawn (200+rand(10,30))
		del(src)
	return

/obj/effect/effect/chem_smoke/Move()
	..()
	for(var/atom/A in view(1, src))
		if(reagents.has_reagent("radium")||reagents.has_reagent("uranium")||reagents.has_reagent("carbon")||reagents.has_reagent("thermite"))//Prevents unholy radium spam by reducing the number of 'greenglows' down to something reasonable -Sieve
			if(prob(5))
				reagents.reaction(A)
		else
			reagents.reaction(A)

	return

/obj/effect/effect/chem_smoke/HasEntered(mob/living/carbon/M as mob )
	..()
	reagents.reaction(M)

	return

/datum/effect/effect/system/chem_smoke_spread
	var/total_smoke = 0 // To stop it being spammed and lagging!
	var/direction
	var/obj/chemholder

	New()
		..()
		chemholder = new/obj()
		var/datum/reagents/R = new/datum/reagents(500)
		chemholder.reagents = R
		R.my_atom = chemholder

	set_up(var/datum/reagents/carry = null, n = 5, c = 0, loca, direct)
		if(n > 20)
			n = 20
		number = n
		cardinals = c
		carry.copy_to(chemholder, carry.total_volume)

		/*
		if((src.reagents.has_reagent("pacid")) || (src.reagents.has_reagent("lube"))) 	   				// Messages admins if someone sprays polyacid or space lube from a Cleaner bottle.
		message_admins("[key_name_admin(user)] fired Polyacid/Space lube from a Cleaner bottle.")			// Polymorph
		log_game("[key_name(user)] fired Polyacid/Space lube from a Cleaner bottle.")
*/

		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)
		if(direct)
			direction = direct

		if(carry.my_atom.fingerprintslast)
			message_admins("A chemical smoke reaction has taken place in ([location.x], [location.y]). Last associated key is [carry.my_atom.fingerprintslast].")
			log_game("A chemical smoke reaction has taken place in ([location.x], [location.y]). Last associated key is [carry.my_atom.fingerprintslast].")
		else
			message_admins("A chemical smoke reaction has taken place in ([location.x], [location.y]). No associated key.")
			log_game("A chemical smoke reaction has taken place in ([location.x], [location.y]). No associated key.")

	start()
		var/i = 0

		var/color = mix_color_from_reagents(chemholder.reagents.reagent_list)

		for(i=0, i<src.number, i++)
			if(src.total_smoke > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/chem_smoke/smoke = new /obj/effect/effect/chem_smoke(src.location)
				src.total_smoke++
				var/direction = src.direction
				if(!direction)
					if(src.cardinals)
						direction = pick(cardinal)
					else
						direction = pick(alldirs)

				if(chemholder.reagents.total_volume != 1) // can't split 1 very well
					chemholder.reagents.copy_to(smoke, chemholder.reagents.total_volume / number) // copy reagents to each smoke, divide evenly

				if(color)
					smoke.icon += color // give the smoke color, if it has any to begin with
				else
					// if no color, just use the old smoke icon
					smoke.icon = 'icons/effects/96x96.dmi'
					smoke.icon_state = "smoke"

				for(i=0, i<pick(0,1,1,1,2,2,2,3), i++)
					sleep(10)
					step(smoke,direction)
				spawn(150+rand(10,30))
					del(smoke)
					src.total_smoke--



/////////////////////////////////////////////
// Sleep smoke
/////////////////////////////////////////////

/obj/effect/effect/sleep_smoke
	name = "smoke"
	icon_state = "smoke"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 6.0
	//Remove this bit to use the old smoke
	icon = 'icons/effects/96x96.dmi'
	pixel_x = -32
	pixel_y = -32

/obj/effect/effect/sleep_smoke/New()
	..()
	spawn (200+rand(10,30))
		del(src)
	return

/obj/effect/effect/sleep_smoke/Move()
	..()
	for(var/mob/living/carbon/M in get_turf(src))
		if (M.internal != null && M.wear_mask && (M.wear_mask.flags & MASKINTERNALS))
//		if (M.wear_suit, /obj/item/clothing/suit/wizrobe && (M.hat, /obj/item/clothing/head/wizard) && (M.shoes, /obj/item/clothing/shoes/sandal))  // I'll work on it later
		else
			M.drop_item()
			M:sleeping += 1
			if (M.coughedtime != 1)
				M.coughedtime = 1
				M.emote("cough")
				spawn ( 20 )
					M.coughedtime = 0
	return

/obj/effect/effect/sleep_smoke/HasEntered(mob/living/carbon/M as mob )
	..()
	if(istype(M, /mob/living/carbon))
		if (M.internal != null && M.wear_mask && (M.wear_mask.flags & MASKINTERNALS))
//		if (M.wear_suit, /obj/item/clothing/suit/wizrobe && (M.hat, /obj/item/clothing/head/wizard) && (M.shoes, /obj/item/clothing/shoes/sandal)) // Work on it later
			return
		else
			M.drop_item()
			M:sleeping += 1
			if (M.coughedtime != 1)
				M.coughedtime = 1
				M.emote("cough")
				spawn ( 20 )
					M.coughedtime = 0
	return

/datum/effect/effect/system/sleep_smoke_spread
	var/total_smoke = 0 // To stop it being spammed and lagging!
	var/direction

	set_up(n = 5, c = 0, loca, direct)
		if(n > 20)
			n = 20
		number = n
		cardinals = c
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)
		if(direct)
			direction = direct


	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			if(src.total_smoke > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/sleep_smoke/smoke = new /obj/effect/effect/sleep_smoke(src.location)
				src.total_smoke++
				var/direction = src.direction
				if(!direction)
					if(src.cardinals)
						direction = pick(cardinal)
					else
						direction = pick(alldirs)
				for(i=0, i<pick(0,1,1,1,2,2,2,3), i++)
					sleep(10)
					step(smoke,direction)
				spawn(150+rand(10,30))
					del(smoke)
					src.total_smoke--

/////////////////////////////////////////////
// Mustard Gas
/////////////////////////////////////////////


/obj/effect/effect/mustard_gas
	name = "mustard gas"
	icon_state = "mustard"
	opacity = 1
	anchored = 0.0
	mouse_opacity = 0
	var/amount = 6.0

/obj/effect/effect/mustard_gas/New()
	..()
	spawn (100)
		del(src)
	return

/obj/effect/effect/mustard_gas/Move()
	..()
	for(var/mob/living/carbon/human/R in get_turf(src))
		if (R.internal != null && usr.wear_mask && (R.wear_mask.flags & MASKINTERNALS) && R.wear_suit != null && !istype(R.wear_suit, /obj/item/clothing/suit/labcoat) && !istype(R.wear_suit, /obj/item/clothing/suit/straight_jacket) && !istype(R.wear_suit, /obj/item/clothing/suit/straight_jacket && !istype(R.wear_suit, /obj/item/clothing/suit/armor)))
		else
			R.burn_skin(0.75)
			if (R.coughedtime != 1)
				R.coughedtime = 1
				R.emote("gasp")
				spawn (20)
					R.coughedtime = 0
			R.updatehealth()
	return

/obj/effect/effect/mustard_gas/HasEntered(mob/living/carbon/human/R as mob )
	..()
	if (istype(R, /mob/living/carbon/human))
		if (R.internal != null && usr.wear_mask && (R.wear_mask.flags & MASKINTERNALS) && R.wear_suit != null && !istype(R.wear_suit, /obj/item/clothing/suit/labcoat) && !istype(R.wear_suit, /obj/item/clothing/suit/straight_jacket) && !istype(R.wear_suit, /obj/item/clothing/suit/straight_jacket && !istype(R.wear_suit, /obj/item/clothing/suit/armor)))
			return
		R.burn_skin(0.75)
		if (R.coughedtime != 1)
			R.coughedtime = 1
			R.emote("gasp")
			spawn (20)
				R.coughedtime = 0
		R.updatehealth()
	return

/datum/effect/effect/system/mustard_gas_spread
	var/total_smoke = 0 // To stop it being spammed and lagging!
	var/direction

	set_up(n = 5, c = 0, loca, direct)
		if(n > 20)
			n = 20
		number = n
		cardinals = c
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)
		if(direct)
			direction = direct

	start()
		var/i = 0
		for(i=0, i<src.number, i++)
			if(src.total_smoke > 20)
				return
			spawn(0)
				if(holder)
					src.location = get_turf(holder)
				var/obj/effect/effect/mustard_gas/smoke = new /obj/effect/effect/mustard_gas(src.location)
				src.total_smoke++
				var/direction = src.direction
				if(!direction)
					if(src.cardinals)
						direction = pick(cardinal)
					else
						direction = pick(alldirs)
				for(i=0, i<pick(0,1,1,1,2,2,2,3), i++)
					sleep(10)
					step(smoke,direction)
				spawn(100)
					del(smoke)
					src.total_smoke--



/////////////////////////////////////////////
//////// Attach an Ion trail to any object, that spawns when it moves (like for the jetpack)
/// just pass in the object to attach it to in set_up
/// Then do start() to start it and stop() to stop it, obviously
/// and don't call start() in a loop that will be repeated otherwise it'll get spammed!
/////////////////////////////////////////////

/obj/effect/effect/ion_trails
	name = "ion trails"
	icon_state = "ion_trails"
	anchored = 1.0

/datum/effect/effect/system/ion_trail_follow
	var/turf/oldposition
	var/processing = 1
	var/on = 1

	set_up(atom/atom)
		attach(atom)
		oldposition = get_turf(atom)

	start()
		if(!src.on)
			src.on = 1
			src.processing = 1
		if(src.processing)
			src.processing = 0
			spawn(0)
				var/turf/T = get_turf(src.holder)
				if(T != src.oldposition)
					if(istype(T, /turf/space))
						var/obj/effect/effect/ion_trails/I = new /obj/effect/effect/ion_trails(src.oldposition)
						src.oldposition = T
						I.dir = src.holder.dir
						flick("ion_fade", I)
						I.icon_state = "blank"
						spawn( 20 )
							del(I)
					spawn(2)
						if(src.on)
							src.processing = 1
							src.start()
				else
					spawn(2)
						if(src.on)
							src.processing = 1
							src.start()

	proc/stop()
		src.processing = 0
		src.on = 0




/////////////////////////////////////////////
//////// Attach a steam trail to an object (eg. a reacting beaker) that will follow it
// even if it's carried of thrown.
/////////////////////////////////////////////

/datum/effect/effect/system/steam_trail_follow
	var/turf/oldposition
	var/processing = 1
	var/on = 1

	set_up(atom/atom)
		attach(atom)
		oldposition = get_turf(atom)

	start()
		if(!src.on)
			src.on = 1
			src.processing = 1
		if(src.processing)
			src.processing = 0
			spawn(0)
				if(src.number < 3)
					var/obj/effect/effect/steam/I = new /obj/effect/effect/steam(src.oldposition)
					src.number++
					src.oldposition = get_turf(holder)
					I.dir = src.holder.dir
					spawn(10)
						del(I)
						src.number--
					spawn(2)
						if(src.on)
							src.processing = 1
							src.start()
				else
					spawn(2)
						if(src.on)
							src.processing = 1
							src.start()

	proc/stop()
		src.processing = 0
		src.on = 0



// Foam
// Similar to smoke, but spreads out more
// metal foams leave behind a foamed metal wall

/obj/effect/effect/foam
	name = "foam"
	icon_state = "foam"
	opacity = 0
	anchored = 1
	density = 0
	layer = OBJ_LAYER + 0.9
	mouse_opacity = 0
	var/amount = 3
	var/expand = 1
	animate_movement = 0
	var/metal = 0


/obj/effect/effect/foam/New(loc, var/ismetal=0)
	..(loc)
	icon_state = "[ismetal ? "m":""]foam"
	metal = ismetal
	playsound(src, 'sound/effects/bubbles2.ogg', 80, 1, -3)
	spawn(3 + metal*3)
		process()
	spawn(120)
		processing_objects.Remove(src)
		sleep(30)

		if(metal)
			var/obj/structure/foamedmetal/M = new(src.loc)
			M.metal = metal
			M.updateicon()

		flick("[icon_state]-disolve", src)
		sleep(5)
		del(src)
	return

// on delete, transfer any reagents to the floor
/obj/effect/effect/foam/Del()
	if(!metal && reagents)
		for(var/atom/A in oview(0,src))
			if(A == src)
				continue
			reagents.reaction(A, 1, 1)
	..()

/obj/effect/effect/foam/process()
	if(--amount < 0)
		return


	for(var/direction in cardinal)


		var/turf/T = get_step(src,direction)
		if(!T)
			continue

		if(!T.Enter(src))
			continue

		var/obj/effect/effect/foam/F = locate() in T
		if(F)
			continue

		F = new(T, metal)
		F.amount = amount
		if(!metal)
			F.create_reagents(10)
			if (reagents)
				for(var/datum/reagent/R in reagents.reagent_list)
					F.reagents.add_reagent(R.id,1)

// foam disolves when heated
// except metal foams
/obj/effect/effect/foam/temperature_expose(datum/gas_mixture/air, exposed_temperature, exposed_volume)
	if(!metal && prob(max(0, exposed_temperature - 475)))
		flick("[icon_state]-disolve", src)

		spawn(5)
			del(src)


/obj/effect/effect/foam/HasEntered(var/atom/movable/AM)
	if(metal)
		return

	if (istype(AM, /mob/living/carbon))
		var/mob/M =	AM
		if (istype(M, /mob/living/carbon/human) && (istype(M:shoes, /obj/item/clothing/shoes) && M:shoes.flags&NOSLIP))
			return

		M.stop_pulling()
		M << "\blue You slipped on the foam!"
		playsound(src.loc, 'sound/misc/slip.ogg', 50, 1, -3)
		M.Stun(5)
		M.Weaken(2)


/datum/effect/effect/system/foam_spread
	var/amount = 5				// the size of the foam spread.
	var/list/carried_reagents	// the IDs of reagents present when the foam was mixed
	var/metal = 0				// 0=foam, 1=metalfoam, 2=ironfoam




	set_up(amt=5, loca, var/datum/reagents/carry = null, var/metalfoam = 0)
		amount = round(sqrt(amt / 3), 1)
		if(istype(loca, /turf/))
			location = loca
		else
			location = get_turf(loca)

		carried_reagents = list()
		metal = metalfoam


		// bit of a hack here. Foam carries along any reagent also present in the glass it is mixed
		// with (defaults to water if none is present). Rather than actually transfer the reagents,
		// this makes a list of the reagent ids and spawns 1 unit of that reagent when the foam disolves.


		if(carry && !metal)
			for(var/datum/reagent/R in carry.reagent_list)
				carried_reagents += R.id

	start()
		spawn(0)
			var/obj/effect/effect/foam/F = locate() in location
			if(F)
				F.amount += amount
				return

			F = new(src.location, metal)
			F.amount = amount

			if(!metal)			// don't carry other chemicals if a metal foam
				F.create_reagents(10)

				if(carried_reagents)
					for(var/id in carried_reagents)
						F.reagents.add_reagent(id,1)
				else
					F.reagents.add_reagent("water", 1)

// wall formed by metal foams
// dense and opaque, but easy to break

/obj/structure/foamedmetal
	icon = 'icons/effects/effects.dmi'
	icon_state = "metalfoam"
	density = 1
	opacity = 1 	// changed in New()
	anchored = 1
	name = "foamed metal"
	desc = "A lightweight foamed metal wall."
	var/metal = 1		// 1=aluminum, 2=iron

	New()
		..()
		update_nearby_tiles(1)



	Del()

		density = 0
		update_nearby_tiles(1)
		..()

	proc/updateicon()
		if(metal == 1)
			icon_state = "metalfoam"
		else
			icon_state = "ironfoam"


	ex_act(severity)
		del(src)

	blob_act()
		del(src)

	bullet_act()
		if(metal==1 || prob(50))
			del(src)

	attack_paw(var/mob/user)
		attack_hand(user)
		return

	attack_hand(var/mob/user)
		if ((HULK in user.mutations) || (prob(75 - metal*25)) || (SUPRSTR in user.augmentations))
			user << "\blue You smash through the metal foam wall."
			for(var/mob/O in oviewers(user))
				if ((O.client && !( O.blinded )))
					O << "\red [user] smashes through the foamed metal."

			del(src)
		else
			user << "\blue You hit the metal foam but bounce off it."
		return


	attackby(var/obj/item/I, var/mob/user)

		if (istype(I, /obj/item/weapon/grab))
			var/obj/item/weapon/grab/G = I
			G.affecting.loc = src.loc
			for(var/mob/O in viewers(src))
				if (O.client)
					O << "\red [G.assailant] smashes [G.affecting] through the foamed metal wall."
			del(I)
			del(src)
			return

		if(prob(I.force*20 - metal*25))
			user << "\blue You smash through the foamed metal with \the [I]."
			for(var/mob/O in oviewers(user))
				if ((O.client && !( O.blinded )))
					O << "\red [user] smashes through the foamed metal."
			del(src)
		else
			user << "\blue You hit the metal foam to no effect."

	CanPass(atom/movable/mover, turf/target, height=1.5, air_group = 0)
		if(air_group) return 0
		return !density


	// shouldn't this be a general procedure?
	// not sure if this neccessary or overkill
	proc/update_nearby_tiles(need_rebuild)
		if(!air_master) return 0

		var/turf/simulated/source = loc
		var/turf/simulated/north = get_step(source,NORTH)
		var/turf/simulated/south = get_step(source,SOUTH)
		var/turf/simulated/east = get_step(source,EAST)
		var/turf/simulated/west = get_step(source,WEST)

		if(need_rebuild)
			if(istype(source)) //Rebuild/update nearby group geometry
				if(source.parent)
					air_master.groups_to_rebuild += source.parent
				else
					air_master.tiles_to_update += source
			if(istype(north))
				if(north.parent)
					air_master.groups_to_rebuild += north.parent
				else
					air_master.tiles_to_update += north
			if(istype(south))
				if(south.parent)
					air_master.groups_to_rebuild += south.parent
				else
					air_master.tiles_to_update += south
			if(istype(east))
				if(east.parent)
					air_master.groups_to_rebuild += east.parent
				else
					air_master.tiles_to_update += east
			if(istype(west))
				if(west.parent)
					air_master.groups_to_rebuild += west.parent
				else
					air_master.tiles_to_update += west
		else
			if(istype(source)) air_master.tiles_to_update += source
			if(istype(north)) air_master.tiles_to_update += north
			if(istype(south)) air_master.tiles_to_update += south
			if(istype(east)) air_master.tiles_to_update += east
			if(istype(west)) air_master.tiles_to_update += west

		return 1

/datum/effect/effect/system/reagents_explosion
	var/amount 						// TNT equivalent
	var/flashing = 0			// does explosion creates flash effect?
	var/flashing_factor = 0		// factor of how powerful the flash effect relatively to the explosion

	set_up (amt, loc, flash = 0, flash_fact = 0)
		amount = amt
		if(istype(loc, /turf/))
			location = loc
		else
			location = get_turf(loc)

		flashing = flash
		flashing_factor = flash_fact

		return

	start()
		if (amount <= 2)
			var/datum/effect/effect/system/spark_spread/s = new /datum/effect/effect/system/spark_spread
			s.set_up(2, 1, location)
			s.start()

			for(var/mob/M in viewers(5, location))
				M << "\red The solution violently explodes."
			for(var/mob/M in viewers(1, location))
				if (prob (50 * amount))
					M << "\red The explosion knocks you down."
					M.Weaken(rand(1,5))
			return
		else
			var/devastation = -1
			var/heavy = -1
			var/light = -1
			var/flash = -1

			// Clamp all values to MAX_EXPLOSION_RANGE
			if (round(amount/12) > 0)
				devastation = min (MAX_EXPLOSION_RANGE, devastation + round(amount/12))

			if (round(amount/6) > 0)
				heavy = min (MAX_EXPLOSION_RANGE, heavy + round(amount/6))

			if (round(amount/3) > 0)
				light = min (MAX_EXPLOSION_RANGE, light + round(amount/3))

			if (flash && flashing_factor)
				flash += (round(amount/4) * flashing_factor)

			for(var/mob/M in viewers(8, location))
				M << "\red The solution violently explodes."

			explosion(location, devastation, heavy, light, flash)