GLOBAL_VAR_INIT(meteor_wave_delay, 625) //minimum wait between waves in tenths of seconds
//set to at least 100 unless you want evarr ruining every round

//Meteors probability of spawning during a given wave

//for space dust event
/var/list/meteors_dust = list(/obj/effect/meteor/dust)

//for normal meteor event
/var/list/meteors_normal = list(
	/obj/effect/meteor/dust=3,
	/obj/effect/meteor/medium=8,
	/obj/effect/meteor/big=3,
	/obj/effect/meteor/flaming=1,
	/obj/effect/meteor/irradiated=3
	)

//for threatening meteor event
/var/list/meteors_threatening = list(
	/obj/effect/meteor/medium=5,
	/obj/effect/meteor/big=10,
	/obj/effect/meteor/flaming=3,
	/obj/effect/meteor/irradiated=3,
	/obj/effect/meteor/emp=3)

//for catastrophic meteor event
/var/list/meteors_catastrophic = list(
	/obj/effect/meteor/medium=5,
	/obj/effect/meteor/big=75,
	/obj/effect/meteor/flaming=10,
	/obj/effect/meteor/irradiated=10,
	/obj/effect/meteor/emp=10)



///////////////////////////////
//Meteor spawning global procs
///////////////////////////////

/proc/spawn_meteors(var/number = 10, var/list/meteortypes, var/startSide, var/zlevel)
	log_debug("Spawning [number] meteors on the [dir2text(startSide)] of [zlevel]")
	for(var/i = 0; i < number; i++)
		spawn_meteor(meteortypes, startSide, zlevel)

/proc/spawn_meteor(var/list/meteortypes, var/startSide, var/startLevel)
	if(isnull(startSide))
		startSide = pick(GLOB.cardinal)
	if(isnull(startLevel))
		startLevel = pick(using_map.station_levels - using_map.sealed_levels)

	var/turf/pickedstart = spaceDebrisStartLoc(startSide, startLevel)
	var/turf/pickedgoal = spaceDebrisFinishLoc(startSide, startLevel)

	var/Me = pickweight(meteortypes)
	var/obj/effect/meteor/M = new Me(pickedstart)
	M.dest = pickedgoal
	spawn(0)
		walk_towards(M, M.dest, 3) //VOREStation Edit - Slower Meteors
	return

/proc/spaceDebrisStartLoc(startSide, Z)
	var/starty
	var/startx
	switch(startSide)
		if(NORTH)
			starty = world.maxy-(TRANSITIONEDGE+1)
			startx = rand((TRANSITIONEDGE+1), world.maxx-(TRANSITIONEDGE+1))
		if(EAST)
			starty = rand((TRANSITIONEDGE+1),world.maxy-(TRANSITIONEDGE+1))
			startx = world.maxx-(TRANSITIONEDGE+1)
		if(SOUTH)
			starty = (TRANSITIONEDGE+1)
			startx = rand((TRANSITIONEDGE+1), world.maxx-(TRANSITIONEDGE+1))
		if(WEST)
			starty = rand((TRANSITIONEDGE+1), world.maxy-(TRANSITIONEDGE+1))
			startx = (TRANSITIONEDGE+1)
	var/turf/T = locate(startx, starty, Z)
	return T

/proc/spaceDebrisFinishLoc(startSide, Z)
	var/endy
	var/endx
	switch(startSide)
		if(NORTH)
			endy = TRANSITIONEDGE
			endx = rand(TRANSITIONEDGE, world.maxx-TRANSITIONEDGE)
		if(EAST)
			endy = rand(TRANSITIONEDGE, world.maxy-TRANSITIONEDGE)
			endx = TRANSITIONEDGE
		if(SOUTH)
			endy = world.maxy-TRANSITIONEDGE
			endx = rand(TRANSITIONEDGE, world.maxx-TRANSITIONEDGE)
		if(WEST)
			endy = rand(TRANSITIONEDGE,world.maxy-TRANSITIONEDGE)
			endx = world.maxx-TRANSITIONEDGE
	var/turf/T = locate(endx, endy, Z)
	return T

// Override for special behavior when getting hit by meteors, and only meteors.  Return one if the meteor hasn't been 'stopped'.
/atom/proc/handle_meteor_impact(var/obj/effect/meteor/meteor)
	return TRUE

///////////////////////
//The meteor effect
//////////////////////

/obj/effect/meteor
	name = "the concept of meteor"
	desc = "You should probably run instead of gawking at this."
	icon = 'icons/obj/meteor.dmi'
	icon_state = "small"
	density = TRUE
	anchored = TRUE
	var/hits = 4
	var/hitpwr = 2 //Level of ex_act to be called on hit.
	var/dest
	pass_flags = PASSTABLE
	var/heavy = FALSE
	var/z_original

	var/meteordrop = /obj/item/ore/iron
	var/dropamt = 2

	// How much damage it does to walls, using take_damage().
	// Normal walls will die to 150 or more, where as reinforced walls need 800 to penetrate.  Durasteel walls need 1200 damage to go through.
	// Multiply this and the hits var to get a rough idea of how penetrating a meteor is.
	var/wall_power = 100

/obj/effect/meteor/Initialize(mapload)
	. = ..()
	z_original = z
	GLOB.meteor_list += src

/obj/effect/meteor/Move()
	if(z != z_original || loc == dest)
		qdel(src)
		return

	. = ..() //process movement...

/obj/effect/meteor/Moved(atom/old_loc, direction, forced = FALSE)
	. = ..()
	var/turf/T = get_turf(loc)
	ram_turf(T)

	if(prob(10) && !istype(T, /turf/space)) //randomly takes a 'hit' from ramming
		get_hit()

/obj/effect/meteor/Destroy()
	walk(src,FALSE) //this cancels the walk_towards() proc
	GLOB.meteor_list -= src
	return ..()

/obj/effect/meteor/Initialize(mapload)
	. = ..()
	SpinAnimation()

/obj/effect/meteor/Bump(atom/A)
	if(attempt_vr(src,"Bump_vr",list(A))) return //VOREStation Edit - allows meteors to be deflected by baseball bats
	if(A)
		if(A.handle_meteor_impact(src)) // Used for special behaviour when getting hit specifically by a meteor, like a shield.
			ram_turf(get_turf(A))
			get_hit()
		else
			die(FALSE)

/obj/effect/meteor/CanPass(atom/movable/mover, turf/target)
	return istype(mover, /obj/effect/meteor) ? TRUE : ..()

/obj/effect/meteor/proc/ram_turf(var/turf/T)
	//first bust whatever is in the turf
	for(var/atom/A in T)
		if(A == src) // Don't hit ourselves.
			continue
		if(isturf(A)) // Don't hit floors. We'll deal with walls later.
			continue
		A.ex_act(hitpwr)

	//then, ram the turf if it still exists
	if(T)
		if(istype(T, /turf/simulated/wall))
			var/turf/simulated/wall/W = T
			W.take_damage(wall_power) // Stronger walls can halt asteroids.

/obj/effect/meteor/proc/get_shield_damage()
	return max(((max(hits, 2)) * (heavy + 1) * rand(6, 12)) / hitpwr , 0)

//process getting 'hit' by colliding with a dense object
//or randomly when ramming turfs
/obj/effect/meteor/proc/get_hit()
	hits--
	if(hits <= 0)
		die(TRUE)

/obj/effect/meteor/proc/die(var/explode = TRUE)
	make_debris()
	meteor_effect(explode)
	qdel(src)

/obj/effect/meteor/ex_act()
	return

/obj/effect/meteor/attackby(obj/item/W as obj, mob/user as mob, params)
	if(istype(W, /obj/item/pickaxe))
		qdel(src)
		return
	..()

/obj/effect/meteor/bullet_act(var/obj/item/projectile/Proj)
	if(Proj.excavation_amount)
		get_hit()

	if(!QDELETED(src))
		wall_power -= Proj.excavation_amount + Proj.damage + (Proj.hitscan * 25)	// Instant-impact projectiles are inherently better at dealing with meteors.

		if(wall_power <= 0)
			die(FALSE) // If you kill the meteor, then it dies.
			return
	return

/obj/effect/meteor/proc/make_debris()
	for(var/throws = dropamt, throws > 0, throws--)
		var/obj/item/O = new meteordrop(get_turf(src))
		O.throw_at(dest, 5, 10)

/obj/effect/meteor/proc/shake_players()
	for(var/mob/M in player_list)
		var/turf/T = get_turf(M)
		if(!T || T.z != src.z)
			continue
		var/dist = get_dist(M.loc, src.loc)
		shake_camera(M, dist > 20 ? 3 : 5, dist > 20 ? 1 : 3)

/obj/effect/meteor/proc/meteor_effect(var/explode)
	if(heavy)
		shake_players()


///////////////////////
//Meteor types
///////////////////////

// Dust breaks windows and hurts normal walls, generally more of an annoyance than a danger unless two happen to hit the same spot.
/obj/effect/meteor/dust
	name = "space dust"
	icon_state = "dust"
	pass_flags = PASSTABLE | PASSGRILLE
	hits = 1
	hitpwr = 3
	meteordrop = /obj/item/ore/glass
	wall_power = 50

// Medium-sized meteors aren't very special and can be stopped easily by r-walls.
/obj/effect/meteor/medium
	name = "meteor"
	dropamt = 3
	wall_power = 200

/obj/effect/meteor/medium/meteor_effect(var/explode)
	..()
	if(explode)
		explosion(src.loc, 0, 1, 2, 3, 0)

// Large-sized meteors generally pack the most punch, but are more concentrated towards the epicenter.
/obj/effect/meteor/big
	name = "large meteor"
	icon_state = "large"
	hits = 8
	heavy = 1
	dropamt = 4
	wall_power = 400

/obj/effect/meteor/big/meteor_effect(var/explode)
	..()
	if(explode)
		explosion(src.loc, 1, 2, 3, 4, 0)

// 'Flaming' meteors do less overall damage but are spread out more due to a larger but weaker explosion at the end.
/obj/effect/meteor/flaming
	name = "flaming meteor"
	icon_state = "flaming"
	hits = 5
	heavy = 1
	meteordrop = /obj/item/ore/phoron
	wall_power = 100

/obj/effect/meteor/flaming/meteor_effect(var/explode)
	..()
	if(explode)
		explosion(src.loc, 1, 2, 3, 4, 0, 0, 5)

// Irradiated meteors do less physical damage but project a ten-tile ranged pulse of radiation upon exploding.
/obj/effect/meteor/irradiated
	name = "glowing meteor"
	icon_state = "glowing"
	heavy = 1
	meteordrop = /obj/item/ore/uranium
	wall_power = 75


/obj/effect/meteor/irradiated/meteor_effect(var/explode)
	..()
	if(explode)
		explosion(src.loc, 0, 0, 4, 3, 0)
	new /obj/effect/decal/cleanable/greenglow(get_turf(src))
	SSradiation.radiate(src, 50)

// This meteor fries toasters.
/obj/effect/meteor/emp
	name = "conducting meteor"
	icon_state = "glowing_blue"
	desc = "Hide your floppies!"
	meteordrop = /obj/item/ore/osmium
	dropamt = 3
	wall_power = 80

/obj/effect/meteor/emp/meteor_effect(var/explode)
	..()
	// Best case scenario: Comparable to a low-yield EMP grenade.
	// Worst case scenario: Comparable to a standard yield EMP grenade.
	empulse(src, rand(1, 3), rand(2, 4), rand(3, 7), rand(5, 10))

/obj/effect/meteor/emp/get_shield_damage()
	return ..() * rand(2,4)

//Station buster Tunguska
/obj/effect/meteor/tunguska
	name = "tunguska meteor"
	icon_state = "flaming"
	desc = "Your life briefly passes before your eyes the moment you lay them on this monstruosity"
	hits = 30
	hitpwr = 1
	heavy = 1
	meteordrop = /obj/item/ore/phoron
	wall_power = 150

/obj/effect/meteor/tunguska/meteor_effect(var/explode)
	..()
	if(explode)
		explosion(src.loc, 3, 6, 9, 20, 0)

/obj/effect/meteor/tunguska/Bump()
	..()
	if(prob(20))
		explosion(src.loc,2,4,6,8)