/proc/dopage(src,target)
	var/href_list
	var/href
	href_list = params2list("src=\ref[src]&[target]=1")
	href = "src=\ref[src];[target]=1"
	src:temphtml = null
	src:Topic(href, href_list)
	return null

/proc/get_area_master(const/O)
	var/area/A = get_area(O)

	if(isarea(A))
		return A

/proc/get_area(atom/A)
	if(!istype(A))
		return
	for(A, A && !isarea(A), A=A.loc); //semicolon is for the empty statement
	return A

/proc/get_area_name(N) //get area by its name
	for(var/area/A in world)
		if(A.name == N)
			return A
	return 0

/proc/get_areas_in_range(dist=0, atom/center=usr)
	if(!dist)
		var/turf/T = get_turf(center)
		return T ? list(T.loc) : list()
	if(!center)
		return list()

	var/list/turfs = RANGE_TURFS(dist, center)
	var/list/areas = list()
	for(var/V in turfs)
		var/turf/T = V
		areas |= T.loc
	return areas

// Like view but bypasses luminosity check

/proc/hear(var/range, var/atom/source)
	var/lum = source.luminosity
	source.luminosity = 6

	var/list/heard = view(range, source)
	source.luminosity = lum

	return heard

/proc/circlerange(center=usr,radius=3)

	var/turf/centerturf = get_turf(center)
	var/list/turfs = new/list()
	var/rsq = radius * (radius+0.5)

	for(var/atom/T in range(radius, centerturf))
		var/dx = T.x - centerturf.x
		var/dy = T.y - centerturf.y
		if(dx*dx + dy*dy <= rsq)
			turfs += T

	//turfs += centerturf
	return turfs

/proc/circleview(center=usr,radius=3)

	var/turf/centerturf = get_turf(center)
	var/list/atoms = new/list()
	var/rsq = radius * (radius+0.5)

	for(var/atom/A in view(radius, centerturf))
		var/dx = A.x - centerturf.x
		var/dy = A.y - centerturf.y
		if(dx*dx + dy*dy <= rsq)
			atoms += A

	//turfs += centerturf
	return atoms

/proc/get_dist_euclidian(atom/Loc1 as turf|mob|obj,atom/Loc2 as turf|mob|obj)
	var/dx = Loc1.x - Loc2.x
	var/dy = Loc1.y - Loc2.y

	var/dist = sqrt(dx**2 + dy**2)

	return dist

/proc/circlerangeturfs(center=usr,radius=3)

	var/turf/centerturf = get_turf(center)
	var/list/turfs = new/list()
	var/rsq = radius * (radius+0.5)

	for(var/turf/T in range(radius, centerturf))
		var/dx = T.x - centerturf.x
		var/dy = T.y - centerturf.y
		if(dx*dx + dy*dy <= rsq)
			turfs += T
	return turfs

/proc/circleviewturfs(center=usr,radius=3)		//Is there even a diffrence between this proc and circlerangeturfs()?

	var/turf/centerturf = get_turf(center)
	var/list/turfs = new/list()
	var/rsq = radius * (radius+0.5)

	for(var/turf/T in view(radius, centerturf))
		var/dx = T.x - centerturf.x
		var/dy = T.y - centerturf.y
		if(dx*dx + dy*dy <= rsq)
			turfs += T
	return turfs



//var/debug_mob = 0

// Will recursively loop through an atom's contents and check for mobs, then it will loop through every atom in that atom's contents.
// It will keep doing this until it checks every content possible. This will fix any problems with mobs, that are inside objects,
// being unable to hear people due to being in a box within a bag.

/proc/recursive_mob_check(var/atom/O,  var/list/L = list(), var/recursion_limit = 3, var/client_check = 1, var/sight_check = 1, var/include_radio = 1)

	//debug_mob += O.contents.len
	if(!recursion_limit)
		return L
	for(var/atom/A in O.contents)

		if(ismob(A))
			var/mob/M = A
			if(client_check && !M.client)
				L |= recursive_mob_check(A, L, recursion_limit - 1, client_check, sight_check, include_radio)
				continue
			if(sight_check && !isInSight(A, O))
				continue
			L |= M
			//log_to_dd("[recursion_limit] = [M] - [get_turf(M)] - ([M.x], [M.y], [M.z])")

		else if(include_radio && istype(A, /obj/item/device/radio))
			if(sight_check && !isInSight(A, O))
				continue
			L |= A

		if(isobj(A) || ismob(A))
			L |= recursive_mob_check(A, L, recursion_limit - 1, client_check, sight_check, include_radio)
	return L

// The old system would loop through lists for a total of 5000 per function call, in an empty server.
// This new system will loop at around 1000 in an empty server.

/proc/get_mobs_in_view(var/R, var/atom/source)
	// Returns a list of mobs in range of R from source. Used in radio and say code.

	var/turf/T = get_turf(source)
	var/list/hear = list()

	if(!T)
		return hear

	var/list/range = hear(R, T)

	for(var/atom/A in range)
		if(ismob(A))
			var/mob/M = A
			if(M.client)
				hear += M
			//log_to_dd("Start = [M] - [get_turf(M)] - ([M.x], [M.y], [M.z])")
		else if(istype(A, /obj/item/device/radio))
			hear += A

		if(isobj(A) || ismob(A))
			hear |= recursive_mob_check(A, hear, 3, 1, 0, 1)

	return hear


/proc/get_mobs_in_radio_ranges(var/list/obj/item/device/radio/radios)

	set background = 1

	. = list()
	// Returns a list of mobs who can hear any of the radios given in @radios
	var/list/speaker_coverage = list()
	for(var/obj/item/device/radio/R in radios)
		if(R)
			//Cyborg checks. Receiving message uses a bit of cyborg's charge.
			var/obj/item/device/radio/borg/BR = R
			if(istype(BR) && BR.myborg)
				var/mob/living/silicon/robot/borg = BR.myborg
				var/datum/robot_component/CO = borg.get_component("radio")
				if(!CO)
					continue //No radio component (Shouldn't happen)
				if(!borg.is_component_functioning("radio"))
					continue //No power.

			var/turf/speaker = get_turf(R)
			if(speaker)
				for(var/turf/T in hear(R.canhear_range,speaker))
					speaker_coverage[T] = T


	// Try to find all the players who can hear the message
	for(var/A in player_list + hear_radio_list)
		var/mob/M = A
		if(M)
			var/turf/ear = get_turf(M)
			if(ear)
				// Ghostship is magic: Ghosts can hear radio chatter from anywhere
				if(speaker_coverage[ear] || (istype(M, /mob/dead/observer) && (M.client) && (M.client.prefs.toggles & CHAT_GHOSTRADIO)))
					. |= M		// Since we're already looping through mobs, why bother using |= ? This only slows things down.
	return .

/proc/inLineOfSight(X1,Y1,X2,Y2,Z=1,PX1=16.5,PY1=16.5,PX2=16.5,PY2=16.5)
	var/turf/T
	if(X1==X2)
		if(Y1==Y2)
			return 1 //Light cannot be blocked on same tile
		else
			var/s = SIMPLE_SIGN(Y2-Y1)
			Y1+=s
			while(Y1!=Y2)
				T=locate(X1,Y1,Z)
				if(T.opacity)
					return 0
				Y1+=s
	else
		var/m=(32*(Y2-Y1)+(PY2-PY1))/(32*(X2-X1)+(PX2-PX1))
		var/b=(Y1+PY1/32-0.015625)-m*(X1+PX1/32-0.015625) //In tiles
		var/signX = SIMPLE_SIGN(X2-X1)
		var/signY = SIMPLE_SIGN(Y2-Y1)
		if(X1<X2)
			b+=m
		while(X1!=X2 || Y1!=Y2)
			if(round(m*X1+b-Y1))
				Y1+=signY //Line exits tile vertically
			else
				X1+=signX //Line exits tile horizontally
			T=locate(X1,Y1,Z)
			if(T.opacity)
				return 0
	return 1

/proc/isInSight(var/atom/A, var/atom/B)
	var/turf/Aturf = get_turf(A)
	var/turf/Bturf = get_turf(B)

	if(!Aturf || !Bturf)
		return 0

	return inLineOfSight(Aturf.x, Aturf.y, Bturf.x, Bturf.y, Aturf.z)

/proc/get_cardinal_step_away(atom/start, atom/finish) //returns the position of a step from start away from finish, in one of the cardinal directions
	//returns only NORTH, SOUTH, EAST, or WEST
	var/dx = finish.x - start.x
	var/dy = finish.y - start.y
	if(abs(dy) > abs (dx)) //slope is above 1:1 (move horizontally in a tie)
		if(dy > 0)
			return get_step(start, SOUTH)
		else
			return get_step(start, NORTH)
	else
		if(dx > 0)
			return get_step(start, WEST)
		else
			return get_step(start, EAST)

/proc/try_move_adjacent(atom/movable/AM)
	var/turf/T = get_turf(AM)
	for(var/direction in cardinal)
		if(AM.Move(get_step(T, direction)))
			break

/proc/get_mob_by_key(var/key)
	for(var/mob/M in mob_list)
		if(M.ckey == lowertext(key))
			return M
	return null

/proc/get_candidates(be_special_type, afk_bracket=3000, override_age=0, override_jobban=0)
	var/roletext = get_roletext(be_special_type)
	var/list/candidates = list()
	// Keep looping until we find a non-afk candidate within the time bracket (we limit the bracket to 10 minutes (6000))
	while(!candidates.len && afk_bracket < 6000)
		for(var/mob/dead/observer/G in player_list)
			if(G.client != null)
				if(!(G.mind && G.mind.current && G.mind.current.stat != DEAD))
					if(!G.client.is_afk(afk_bracket) && (be_special_type in G.client.prefs.be_special))
						if(!override_jobban || (!jobban_isbanned(G, roletext) && !jobban_isbanned(G,"Syndicate")))
							if(override_age || player_old_enough_antag(G.client,be_special_type))
								candidates += G.client
		afk_bracket += 600 // Add a minute to the bracket, for every attempt

	return candidates

/proc/get_candidate_ghosts(be_special_type, afk_bracket=3000, override_age=0, override_jobban=0)
	var/roletext = get_roletext(be_special_type)
	var/list/candidates = list()
	// Keep looping until we find a non-afk candidate within the time bracket (we limit the bracket to 10 minutes (6000))
	while(!candidates.len && afk_bracket < 6000)
		for(var/mob/dead/observer/G in player_list)
			if(G.client != null)
				if(!(G.mind && G.mind.current && G.mind.current.stat != DEAD))
					if(!G.client.is_afk(afk_bracket) && (be_special_type in G.client.prefs.be_special))
						if(!override_jobban || (!jobban_isbanned(G, roletext) && !jobban_isbanned(G,"Syndicate")))
							if(override_age || player_old_enough_antag(G.client,be_special_type))
								candidates += G
		afk_bracket += 600 // Add a minute to the bracket, for every attempt

	return candidates

/proc/ScreenText(obj/O, maptext="", screen_loc="CENTER-7,CENTER-7", maptext_height=480, maptext_width=480)
	if(!isobj(O))	O = new /obj/screen/text()
	O.maptext = maptext
	O.maptext_height = maptext_height
	O.maptext_width = maptext_width
	O.screen_loc = screen_loc
	return O

/proc/Show2Group4Delay(obj/O, list/group, delay=0)
	if(!isobj(O))	return
	if(!group)	group = clients
	for(var/client/C in group)
		C.screen += O
	if(delay)
		spawn(delay)
			for(var/client/C in group)
				C.screen -= O

/proc/flick_overlay(image/I, list/show_to, duration)
	for(var/client/C in show_to)
		C.images += I
	spawn(duration)
		for(var/client/C in show_to)
			C.images -= I

/proc/get_active_player_count()
	// Get active players who are playing in the round
	var/active_players = 0
	for(var/i = 1; i <= player_list.len; i++)
		var/mob/M = player_list[i]
		if(M && M.client)
			if(istype(M, /mob/new_player)) // exclude people in the lobby
				continue
			else if(isobserver(M)) // Ghosts are fine if they were playing once (didn't start as observers)
				var/mob/dead/observer/O = M
				if(O.started_as_observer) // Exclude people who started as observers
					continue
			active_players++
	return active_players

/datum/projectile_data
	var/src_x
	var/src_y
	var/time
	var/distance
	var/power_x
	var/power_y
	var/dest_x
	var/dest_y

/datum/projectile_data/New(var/src_x, var/src_y, var/time, var/distance, \
						   var/power_x, var/power_y, var/dest_x, var/dest_y)
	src.src_x = src_x
	src.src_y = src_y
	src.time = time
	src.distance = distance
	src.power_x = power_x
	src.power_y = power_y
	src.dest_x = dest_x
	src.dest_y = dest_y

/proc/projectile_trajectory(var/src_x, var/src_y, var/rotation, var/angle, var/power)

	// returns the destination (Vx,y) that a projectile shot at [src_x], [src_y], with an angle of [angle],
	// rotated at [rotation] and with the power of [power]
	// Thanks to VistaPOWA for this function

	var/power_x = power * cos(angle)
	var/power_y = power * sin(angle)
	var/time = 2* power_y / 10 //10 = g

	var/distance = time * power_x

	var/dest_x = src_x + distance*sin(rotation);
	var/dest_y = src_y + distance*cos(rotation);

	return new /datum/projectile_data(src_x, src_y, time, distance, power_x, power_y, dest_x, dest_y)


/proc/mobs_in_area(var/area/the_area, var/client_needed=0, var/moblist=mob_list)
	var/list/mobs_found[0]
	var/area/our_area = get_area_master(the_area)
	for(var/mob/M in moblist)
		if(client_needed && !M.client)
			continue
		if(our_area != get_area_master(M))
			continue
		mobs_found += M
	return mobs_found

/proc/GetRedPart(const/hexa)
	return hex2num(copytext(hexa,2,4))

/proc/GetGreenPart(const/hexa)
	return hex2num(copytext(hexa,4,6))

/proc/GetBluePart(const/hexa)
	return hex2num(copytext(hexa,6,8))

/proc/GetHexColors(const/hexa)
	return list(
			GetRedPart(hexa),
			GetGreenPart(hexa),
			GetBluePart(hexa)
		)


/proc/alone_in_area(var/area/the_area, var/mob/must_be_alone, var/check_type = /mob/living/carbon)
	var/area/our_area = get_area_master(the_area)
	for(var/C in living_mob_list)
		if(!istype(C, check_type))
			continue
		if(C == must_be_alone)
			continue
		if(our_area == get_area_master(C))
			return 0
	return 1

/proc/MinutesToTicks(var/minutes as num)
	return minutes * 60 * 10

/proc/SecondsToTicks(var/seconds)
	return seconds * 10

proc/pollCandidates(var/Question, var/be_special_type, var/antag_age_check = 0, var/poll_time = 300)
	var/roletext = be_special_type ? get_roletext(be_special_type) : null
	var/list/mob/dead/observer/candidates = list()
	var/time_passed = world.time
	if(!Question)
		Question = "Would you like to be a special role?"

	for(var/mob/dead/observer/G in player_list)
		if(!G.key || !G.client)
			continue
		if(be_special_type)
			if(!(be_special_type in G.client.prefs.be_special))
				continue
			if(antag_age_check)
				if(!player_old_enough_antag(G.client, be_special_type))
					continue
		if(roletext)
			if(jobban_isbanned(G, roletext) || jobban_isbanned(G, "Syndicate"))
				continue
		if(G.has_enabled_antagHUD)
			continue
		spawn(0)
			G << 'sound/misc/notice2.ogg'//Alerting them to their consideration

			switch(alert(G,Question,"Please answer in [poll_time/10] seconds!","Yes","No"))
				if("Yes")
					to_chat(G, "<span class='notice'>Choice registered: Yes.</span>")
					if((world.time-time_passed)>poll_time)//If more than 30 game seconds passed.
						to_chat(G, "<span class='danger'>Sorry, you were too late for the consideration!</span>")
						G << 'sound/machines/buzz-sigh.ogg'
						return
					candidates += G
				if("No")
					to_chat(G, "<span class='danger'>Choice registered: No.</span>")
					return
				else
					return
	sleep(poll_time)

	//Check all our candidates, to make sure they didn't log off during the 30 second wait period.
	for(var/mob/dead/observer/G in candidates)
		if(!G.key || !G.client)
			candidates.Remove(G)

	return candidates