--First attempt at excavation program
function dumpInv() --Dumps inventory into ender chest located in slot 1
  turtle.digUp()
  turtle.select(1)
  turtle.placeUp()
  for i = 1,15 do
    i = i + 1
    turtle.dropUp()
  end
  turtle.select(1)
  turtle.digUp()
end

function checkInv()
  if turtle.getItemCount(16) ~= 0 then
    dumpInv()
  end
end
  
function digFwd()
  while turtle.forward() == false do
    turtle.dig()
  end
end  

function digRow()
  turtle.select(1)
  for l = 1,(x-1) do
	checkInv()
	digFwd()
  end
end

--Main function
print("Enter even length")
x = io.read()
x = tonumber(x)
print("Enter even width")
y = io.read()
y = tonumber(y)
print("Enter even depth")
z = io.read()
z = tonumber(z)
fuelreq = x * y * z --Checking fuel level
if turtle.getFuelLevel() < fuelreq then
  print("Not enough fuel...rebooting")
  os.sleep(10)
  os.reboot()
end
for h = 1,z do
  for w = 1,((y/2)-1) do
    digRow()
	turtle.turnRight()
	digFwd()
	turtle.turnRight()
	digRow()
	turtle.turnLeft()
	digFwd()
	turtle.turnLeft()
  end
  digRow()
  turtle.turnRight()
  digFwd()
  turtle.turnRight()
  digRow()
  while turtle.down == false do
    turtle.digDown()
  end
  turtle.turnRight()
end
dumpInv()