Turtle Flax Farm

--[[
1-4 - flax seeds
5-11 - string
12 - cobble
13 - planks
14 - other planks
15 - chest
16 - charcoal
]]--
seedSlot = 1
coalSlot = 13
while true do
outOfSeeds = 0
refuel = 1
while turtle.getFuelLevel() <= 500 do
  turtle.select(16)
  drop = turtle.getItemCount(16)
  drop = drop - 1
  turtle.refuel(drop)
  refuel = refuel + 1
  if refuel >= 5 then
   print("I am out of fuel")
   error()
  end
end
if turtle.detectDown()then
  turtle.select(seedSlot)
  while turtle.getItemCount(seedSlot) <= 1 do
   seedSlot = seedSlot + 1
   if seedSlot > 4 then
    seedSlot = 1
   end
   turtle.select(seedSlot)
   outOfSeeds = outOfSeeds + 1
   if outOfSeeds >= 6 then
    print("I am out of seeds")
    error()
   end
  end
  turtle.digDown()
  turtle.down()
  turtle.digDown()
  turtle.suckDown()
  turtle.placeDown()
  turtle.up()
  turtle.forward()
end
turtle.select(14)
if turtle.compare() then
  turtle.turnLeft()
  if not turtle.detect() then
   turtle.forward()
  end
  turtle.turnLeft()
end
turtle.select(13)
if turtle.compare() then
  turtle.turnRight()
  if turtle.detect() then
   turtle.turnLeft()
   turtle.turnLeft()
   while not turtle.detect() do
    turtle.forward()
   end
   turtle.turnLeft()
  else
   turtle.forward()
   turtle.turnRight()
  end
end
turtle.select(15)
if turtle.compare() then
  for slot = 5, 12 do
   turtle.select(slot)
   drop = turtle.getItemCount(slot)
   drop = drop - 1
   turtle.drop(drop)
  end
  for slot = 3, 4 do
   turtle.select(slot)
   drop = turtle.getItemCount(slot)
   drop = drop - 1
   turtle.drop(drop)
  end
  turtle.select(16)
  if turtle.getItemCount(16) <= 1 then
   turtle.suckUp()
  end
  turtle.turnRight()
  turtle.forward()
  turtle.turnRight()
end
turtle.select(12)
if turtle.compare() then
  turtle.turnLeft()
end
if not turtle.detectDown() then
  turtle.forward()
end

end