Turtle Rampage!

while true do
local s = 1
if turtle.getFuelLevel() < 20 then
while true do
turtle.select(s)
turtle.refuel(1)
if turtle.getFuelLevel() > 20 then
break
end
if s == 16 then
s = 1
else
s = s+1
end
end
end
s = 1
turtle.select(1)
print("RAMPAGGEEEE!!!!!!")
if turtle.detect() == true then
turtle.dig()
end
if turtle.detectUp() == true then
turtle.digUp()
end
if turtle.detectDown() == true then
turtle.digDown()
end
num = math.random(1,7)
num = math.ceil(num)
if num == 2 then
turtle.forward()
elseif num == 3 then
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
elseif num == 4 then
turtle.up()
elseif num == 5 then
turtle.down()
elseif num == 6 then
turtle.turnLeft()
if turtle.detect() == true then
turtle.dig()
end
turtle.forward()
elseif num == 7 then
turtle.turnRight()
if turtle.detect() == true then
turtle.dig()
end
turtle.forward()
end
end