-- based off of NVZRR code, specifically mutant randomization
-- thanx to sickie for providing the formula and chances

local MutantTable = {
	-- T1
	{"Crawler", 1},
	{"Puncher", 3},
	{"Twohead", 5},
	{"Spitter", 8},
	-- T2
	{"Exploder", 10},
	{"Mindflayer", 12},
	{"Imitator", 14},
	{"Armzooka", 19},
	{"Plague", 20},
	-- T3
	{"Stalker", 50},
	{"Abominable", 80},
	{"Freak", 90},
	{"Demolisher", 100},
	{"Puker", 110},
	{"Crusher", 120},
	{"Spewer", 140},
	-- T4
	{"Nest", 200},
	{"Sprayer", 250},
	{"Juggernaut", 400},
	-- T5 / Mold
	{"Mold", 500},
	-- mold is 800 on maps w/o dedicated spawns

}

-- added for simplicity
local VictimAlive = true
local VictimIsPlayer = true
local VictimMaxHealth = 100
local VictimAttacking = false
local PlayerRank = 25

function CheckRoll(RollValue) -- formula as stated on the nvzrr wiki
	if VictimAlive == true then
		RollValue = RollValue * 0.75
	end

	if VictimIsPlayer == true then
		RollValue = RollValue * (1 - (PlayerRank * 0.008)) 
	end

	RollValue = RollValue * math.clamp(((1500 - VictimMaxHealth) * 0.008), 0.35, 1)

	if VictimIsPlayer == false and VictimAlive == true and VictimAttacking == false then
		RollValue = RollValue * 1.1
	end

	if VictimIsPlayer == false then
		RollValue = RollValue * 1.15
	end

	return RollValue
end

function RandomizeValues() -- ignore this i'm lazy 
	local Randomizer = math.random(1,2)
	if Randomizer == 2 then
		VictimAlive = true
	else
		VictimAlive = false
	end
	Randomizer = math.random(1,2)
	if Randomizer == 2 then
		VictimIsPlayer = true
	else
		VictimIsPlayer = false
	end
	Randomizer = math.random(1,2)
	if Randomizer == 2 then
		VictimIsPlayer = true
	else
		VictimIsPlayer = false
	end
	Randomizer = math.random(1, 25)
	PlayerRank = Randomizer
	if VictimIsPlayer == false then
		PlayerRank = 1
	end
	Randomizer = math.random(1,2)
	if Randomizer == 2 then
		VictimAttacking = true
	else
		VictimAttacking = false
	end
	Randomizer = math.random(1,1500)
	VictimMaxHealth = Randomizer
end

for count = 1, 250 do
	for i, MutantRoll in pairs(MutantTable) do
		RandomizeValues()
		local DiceRoll = CheckRoll(math.random(1, MutantRoll[2]) * MutantRoll[2])
		if DiceRoll <= MutantRoll[2] then
			print("Spawning in " .. MutantRoll[1] .. " mutant of rarity " .. MutantRoll[2])
			break
		end
	end
	task.wait()
end

-- works in roblox studio