-- Digging Down to 16 by Guude

-- Vars
local tArgs = { ... }
local curh = tonumber(tArgs[1])
local cw = tArgs[2]
cw = cw or "y"
local dest = 16
local dist = curh - dest
local roomrad = 10
local roomsize = 20
local torch = 1
local stair = 2
local cobble = 3
local fuel = 4

--Functions

function tfuel(amount)
 if turtle.getFuelLevel() < 5 then
  turtle.select(fuel)
  turtle.refuel(amount)
 end
end

function turnaround()
  turtle.turnRight()
  turtle.turnRight()
end

function placefront(item)
 turtle.select(item)
 turtle.place()
end

function placedown(item)
 turtle.select(item)
 turtle.placeDown()
end

function placeup(item)
 turtle.select(item)
 turtle.placeUp()
end

function checkwalls()
 if cw == "y" then
  turtle.turnRight()
  if (turtle.detect() == false) then
   placefront(cobble)
  end
  turnaround()
  if (turtle.detect() == false) then
   placefront(cobble)
  end
  turtle.turnRight()
 end
end

function checkwallsL()
 if cw == "y" then
  turtle.turnLeft()
  if (turtle.detect() == false) then
   placefront(cobble)
  end
  tfuel(1)
  turtle.down()
  if (turtle.detect() == false) then
   placefront(cobble)
  end
  tfuel(1)
  turtle.up()
  turtle.up()
  if (turtle.detect() == false) then
   placefront(cobble)
  end
  tfuel(1)
  turtle.down()
  turtle.turnRight()
 end
end

function digfoward()
 repeat
  turtle.dig()
  sleep(0.5)
 until turtle.detect() == false
end

function digup()
 repeat
  turtle.digUp()
  sleep(0.5)
 until turtle.detectUp() == false
end


-- Main Script
for i = 1, dist do
 tfuel(1)
 turtle.digDown()
 turtle.down()
 digfoward()
 checkwalls()
 if (turtle.detectDown() == false) then
  placedown(cobble)
 end
 tfuel(1)
 turtle.forward()
 turnaround()
 placefront(stair)
 turnaround()
 for j=1, 2 do
  checkwalls()
  digfoward()
  tfuel(1)
  turtle.forward()
 end
 turnaround()
 tfuel(1)
 turtle.forward()
 turtle.forward()
 turnaround()
 if (i % 4 == 0) then
  placeup(torch)
 end
end

--Clear Room

turtle.turnLeft()
tfuel(1)
turtle.up()
pass = 0
while (roomsize >= 0) do
 for r = 1, roomrad do
  digfoward()
  tfuel(1)
  turtle.forward()
  digup()
  turtle.digDown()
  if (pass == 0) then
   checkwallsL()
  end
 end 

 for l = 1, 3 do
  turtle.turnRight()
  for r = 1, roomsize do
   digfoward()
   tfuel(1) 
   turtle.forward()
   digup()
   turtle.digDown()
  if (pass == 0) then
   checkwallsL()
  end
   if (r % 6 == 0) then
    placedown(torch)
   end
  end
 end

 turtle.turnRight()
 for r = 1, roomrad do
  digfoward()
  tfuel(1)
  turtle.forward()
  digup()
  turtle.digDown()
  if (pass == 0) then
   checkwallsL()
  end
 end
 tfuel(1)
 turtle.forward()
 turtle.turnRight()
 digfoward()
 tfuel(1)
 turtle.forward()
 turtle.turnLeft()
 pass = pass + 1
 roomrad = roomrad - 1
 roomsize = roomsize - 2
end