Minecraft ComputerCraft Room Mining Program

function PlaceTorch()
  for a = 1, 16 do
    turtle.select(a)
    c = turtle.getItemCount(a)
    if c == 0 then

    else
      s = turtle.getItemDetail(a)

      if s.name == "minecraft:torch" then
        turtle.placeDown()
        return
      end
    end
  end
end

local tArgs = {...}
if #tArgs ~= 3 then
  print("Requires length, width & height!")
  return
end

local x = tonumber(tArgs[1]) - 1
local y = tonumber(tArgs[2])
local z = tonumber(tArgs[3])
local x2 = 0
local y2 = 0
local startingtorch = false
local distance = 0
local countdown = false

if x == nil or y == nil or z == nil then
  print("Invalid dimensions!")
  return
end

if x < 0 or y < 0 or z < 0 then
  print("Invalid (negative) dimensions!")
  return
end

local fuel = turtle.getFuelLevel()
local roomSize = x * y * z
while fuel < roomSize do
  if not turtle.refuel(1) then
    print("Not enough fuel!")
    return
  end
end

local xTimes = x + 1
local yTimes = y
local xTorches = 0
local yTorches = 0
local t = true
local tt = true

while t == true do
  if xTimes >= 4 then
    xTimes = xTimes - 4
    xTorches = xTorches + 1
  elseif xTimes < 4 and xTimes > 0 then
    xTorches = xTorches + 1
    t = false
  elseif xTimes == 1 then
    xTorches = xTorches + 1
    t = false
  else
    t = false
    if xTimes == 0 then
      xTimes = 4
    end
  end
end

while tt == true do
  if yTimes >= 4 then
    yTimes = yTimes - 4
    yTorches = yTorches + 1
  elseif yTimes < 4 and yTimes > 0 then
    yTorches = yTorches + 1
    tt = false
  elseif yTimes == 1 then
    yTorches = yTorches + 1
    tt = false
  else
    tt = false
    if yTimes == 0 then
      yTimes = 4
    end
  end
end

local RequiredTorches = xTorches * yTorches
local Torches = 0

for a = 1, 16 do
  turtle.select(a)
  c = turtle.getItemCount(a)
  if c == 0 then

  else
    s = turtle.getItemDetail(a)
    if s.name == "minecraft:torch" then
      Torches = Torches + c
    end
  end
end

if RequiredTorches > Torches and z > 1 then
    print("Not enough Torches! You require a total of " .. RequiredTorches .. " Torches!")
    return
else
    print("Good to go!")
end

local direction = true
for i = 1, z do
  for j = 1, y do
    for k = 1, x do
      if i == 2 and j == yTimes and k == xTimes then
        PlaceTorch()
        startingtorch = true
      end
      if turtle.forward() == false then
        repeat
          turtle.dig()
          sleep(0.25)
        until turtle.forward() == true
      end
      if i == 2 and startingtorch == true then
        if countdown == false then
          x2 = x2 + 1
          if x2 == 4 then
            PlaceTorch()
            x2 = 0
          end
        elseif countdown == true then
          distance = distance + 1
          if xTimes == 1 then
            if distance == (x + 1) * 3 + 1 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 2 then
            if distance == (x + 1) * 3 + 2 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 3 then
            if distance == (x + 1) * 3 + 3 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 4 then
            if distance == (x + 1) * 3 + 4 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          end
        end
      end
    end
    if j < y then
      if direction then
        if i == 2 and countdown == false and startingtorch == true then
          countdown = true
        end
        turtle.turnRight()
        if turtle.forward() == false then
          repeat
            turtle.dig()
            sleep(0.25)
          until turtle.forward() == true
        end
        if i == 2 and startingtorch == true and countdown == true then
          distance = distance + 1
        end
        turtle.turnRight()
        direction = false
      else
        turtle.turnLeft()
        if turtle.forward() == false then
          repeat
            turtle.dig()
            sleep(0.25)
          until turtle.forward() == true
        end
        if i == 2 and startingtorch == true and countdown == true then
          distance = distance + 1
          if xTimes == 1 then
            if distance == (x + 1) * 3 + 1 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 2 then
            if distance == (x + 1) * 3 + 2 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 3 then
            if distance == (x + 1) * 3 + 3 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          elseif xTimes == 4 then
            if distance == (x + 1) * 3 + 4 then
              distance = 0
              PlaceTorch()
              countdown = false
            end
          end
        end
        turtle.turnLeft()
        direction = true
      end
    end
  end
  if i < z then
    turtle.digUp()
    turtle.up()
    turtle.turnRight()
    turtle.turnRight()
  end
end

if y % 2 == 0 then
  turtle.turnRight()
  for i = 1, y do
    turtle.forward()
  end
  turtle.turnRight()
else
  turtle.turnLeft()
  for i = 1, y do
    turtle.forward()
  end
  turtle.turnLeft()
  for i = 1, x do
    turtle.forward()
  end
  turtle.turnRight()
  turtle.turnRight()
end
for i = 1, z do
  turtle.down()
end