room

local ar = {...}
if #ar ~= 3 then
  print("Usage: <width> <length> <height>")
  return
end

local w = tonumber(ar[1])
local l = tonumber(ar[2])
local h = tonumber(ar[3])

if w < 3 then
  print("width must be greater than 2")
  return
elseif l < 3 then
  print("length must be greater than 2")
  return
elseif h < 3 then
  print("height must be greater than 2")
  return
end

if turtle.getItemCount(1) == 0 then
  print("Insert items into turtle")
  return
end

local function go()
  while not turtle.forward() do
    turtle.dig()
  end
end

local function back()
  while not turtle.back() do
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.dig()
    turtle.turnLeft()
    turtle.turnLeft()
  end
end

local function up()
  while not turtle.up() do
    turtle.digUp()
  end
end

local function down()
  while not turtle.down() do
    turtle.digDown()
  end
end

local function put(p)
  turtle.select(1)
  while turtle.getItemCount(1) < 2 do
    for x = 2, 16 do
      turtle.select(x)
      if turtle.compareTo(1) then
        turtle.transferTo(1)
      end
    end
    sleep(1)
    turtle.select(1)
  end
  if p == nil then
    while not turtle.place() do
      turtle.dig()
    end
  elseif p == up then
    while not turtle.placeUp() do
      turtle.digUp()
    end
  elseif p == down then
    while not turtle.placeDown() do
      turtle.digDown()
    end
  end
end

local function wside()
  put(down)
  for x = 1, ar[1]-1 do
    go()
    put(down)
  end
  for x = 1, ar[1]-1 do
    back()
  end
end

local function lside()
  for x = 1, ar[2]-1 do
    wside()
    turtle.turnRight()
    go()
    turtle.turnLeft()
  end
  put(down)
  for x = 1, ar[1]-1 do
    go()
    put(down)
  end
end

local function wall()
  turtle.turnLeft()
  for x = 1, ar[2]-1 do
    for i = 1, ar[3]-2 do
      up()
      put(down)
    end
    go()
    for j = 1, ar[3]-2 do
      down()
    end
  end
  for x = 1, ar[3]-2 do
    up()
    put(down)
  end
  turtle.turnLeft() -- at top left
  go()
  for x = 1, ar[3]-2 do
    down()
  end
  for x = 1, ar[1]-2 do
    for i = 1, ar[3]-2 do
      up()
      put(down)
    end
    go()
    for j = 1, ar[3]-2 do
      down()
    end
  end
  turtle.turnLeft() -- at bottom left
  for x = 1, ar[2]-1 do
    for i = 1, ar[3]-2 do
      up()
      put(down)
    end
    go()
    for j = 1, ar[3]-2 do
      down()
    end
  end
  turtle.turnLeft() -- at bottom right
  for x = 1, ar[1]-2 do
    for i = 1, ar[3]-2 do
      up()
      put(down)
    end
    go()
    for j = 1, ar[3]-2 do
      down()
    end
  end
  for x = 1, ar[3]-2 do
    up()
    put(down)
  end -- wall completed
  turtle.turnLeft()
  for x = 1, ar[2]-1 do
    go()
  end
  turtle.turnLeft()
  for x = 1, ar[1]-2 do
    go()
  end
  turtle.turnLeft()
  turtle.turnLeft()
end -- position in S facing N

lside()
wall()
up()
lside()

back()
turtle.turnLeft()
down()
down()
put(up)
go()
turtle.turnLeft()
turtle.turnLeft()
put()
turtle.turnLeft()
turtle.turnLeft()

local function lclear()
  for x = 1, ar[2]-3 do
    go()
  end
  for x = 1, ar[2]-3 do
    back()
  end
end

local function hclear()
  for x = 1, ar[3]-3 do
    lcear()
    down()
  end
  lclear()
  for x = 1, ar[3]-3 do
    up()
  end
end

local function empty()
  for x = 1, ar[1]-3 do
    hclear()
    turtle.turnLeft()
    go()
    turtle.turnLeft()
  end
  hclear()
end

empty()
for x = 1, ar[3]-4 do
  down()
end
turtle.turnLeft()
go()