os.loadAPI("turtle2")
turtle2:reloadConfigs()

local function comeOutOfHole()
   turtle2:up()
   turtle2:forward()
   turtle2:up()
   turtle2:turnLeft()
end

local slot = 4

local function farmSquare()
   turtle2.select(1)
   if turtle2:digDown() then
      if turtle2.getItemCount(slot) == 0 then
         slot = slot < 16 and slot + 1
         if turtle2.getItemCount(slot) == 0 then
            print("out of seed.... ;-(")
            turtle2.returnHome()
            return false
         end
      end
      turtle2.select(slot)
      if not turtle2:placeDown() then turtle2:digDown() turtle2:placeDown() end

   end
   return true
end

while true do
   if turtle2:getFuelLevel() < 190 then
      error("Not enough fuel to make full trip. Please refuel")
   end
   comeOutOfHole()
   turn = true
   for i=1,5 do
   while turtle2:forward() do
      if not farmSquare() then return end
   end
   turnFunc=turn and turtle2.turnRight or turtle2.turnLeft()
   turnFunc(turtle2) turtle2:forward() farmSquare() turnFunc(turtle2)
   end
   turtle2.returnHome()
   for j=1,16 do
      itemCount = turtle2.getItemCount(j)
      if itemCount > 1 then
         turtle2.select(j)
         turtle2.dropDown(itemCount-1)
      end
   end
   sleep(4200) --70 min
end