Lumberjack

do
  local reserve = turtle.getItemCount(16)
  local fuel = turtle.getFuelLevel()
  write("Checking Resources...\nIf available, place bone meals at slot 14.\n IMPORTANT\nDon't get the item slots mixed up, it's 1 - 16:top-left-right-bottom.\n At least 1 wood of the tree to farm at slot 1.\n Saplings go in slot 15 and source of fuel at slot 16.\n\n\n\n")

  function lackResource()
    write("Lacking Resources\n")
    write("[[Resource Placement]]\nItem\t\t\t\t\t\t\t\t:\tSlot Number\n")
    write("Wood\t\t\t\t\t\t\t\t:\tSlot 1\nBone Meal\t\t\t:\tSlot 14\nSapling\t\t\t\t\t:\tSlot 15\nFuel Source\t:\tSlot 16\n")
    write("Placing other items in these slots will cause unusual turtle behaviour.\n")
    do
      error()
    end
  end

  local sapling = turtle.getItemCount(15)
  local wood = turtle.getItemCount(1)
  if sapling >= 1 and wood >= 1 then

  local function down()
    while not turtle.down() do
      if turtle.detectDown() then
          --#there's a block
          --#we should mine it
      turtle.digDown()
      else
         --#we can assume it's an entity
         --#we should attack it
      turtle.attackDown()
      end
    end
  end

    function reposition()
      turtle.turnRight()
      turtle.turnRight()
      turtle.forward()
      turtle.forward()
      turtle.forward()
      turtle.turnRight()
      turtle.turnRight()
      turtle.select(1)
    end

    function repositionbone()
      turtle.turnRight()
      turtle.turnRight()
      turtle.forward()
      turtle.forward()
      turtle.turnRight()
      turtle.turnRight()
      turtle.select(1)
    end

    function surplus()
     surp = turtle.getItemCount(2)
     if surp >= 2 then
       turtle.turnLeft()
       turtle.select(2)
       turtle.drop()
       turtle.turnRight()
     end
    end

    function plantSap()
      if not turtle.detect() then
        turtle.forward()
      end
      if not turtle.detect() then
        turtle.forward()
      end
      if turtle.detect() then
        turtle.select(1)
        fellOrwait()
      end
      if not turtle.detect() then
        sapling = turtle.getItemCount(15)
        if sapling >= 1 then
          turtle.select(15)
          turtle.place()
          turtle.select(1)
          checkBone()
        end
        reposition()
        lackResource()
      end
    end

    function checkBone()
      bone = turtle.getItemCount(14)
      if bone >= 1 then
        turtle.select(1)
        if not turtle.compare() then
          bone = turtle.getItemCount(14)
          if bone >= 1 then
            turtle.select(14)
            turtle.place()
            turtle.select(1)
          end
          fellOrwait()
        end
        if turtle.compare() then
          fellOrwait()
        end
      end
      turtle.select(1)
      fellOrwait()
    end

    function fellOrwait()
      fuel = turtle.getFuelLevel()
      if fuel <= 78 then
        reserve = turtle.getItemCount(16)
        if reserve == 0 then
          write("Out of fuel reserve\n")
          repositionbone()
          lackResource()
        end
        turtle.select(16)
        turtle.refuel(1)
        turtle.select(1)
      end
      if turtle.compare() then
        turtle.dig()
        turtle.forward()
        while turtle.compareUp() do
          turtle.digUp()
          turtle.up()
        end
        while not turtle.detectDown() do
          down()
        end
        sapling = turtle.getItemCount(15)
        if sapling >= 1 then
          turtle.turnLeft()
          turtle.suck()
          turtle.turnRight()
          turtle.turnRight()
          turtle.suck()
          surplus()
          turtle.turnRight()
          turtle.forward()
          turtle.turnRight()
          turtle.turnRight()
          turtle.select(15)
          turtle.place()
          turtle.select(1)
          bone = turtle.getItemCount(14)
          if bone >= 1 then
            checkBone()
          end
          repositionbone()
          sleep(180)
          plantSap()
        end
        reposition()
        lackResource()
      end
      if not turtle.compare() then
        bone = turtle.getItemCount(14)
        if bone >= 1 then
            checkBone()
        end
        repositionbone()
        sleep(180)
        print("Waiting for growth!")
        plantSap()
      end
    end


    print("Number of Saplings: " ..sapling.. "\nWood reference checked! OK!\n")
    fuel = turtle.getFuelLevel()
    reserve = turtle.getItemCount(16)
    if fuel <= 79 then
      if reserve == 0 then
        write("NOT ENOUGH FUEL FOR OPERATION\nPLACE FUEL ITEM IN SLOT 16\n")
        lackResource()
      end
      do
        turtle.select(16)
        turtle.refuel(1)
        turtle.select(1)
        fuel = turtle.getFuelLevel()
        print("Fuel Level:" ..fuel.."~\nAll Clear!\nCommencing Automated Logging\n")
      end
    end
  plantSap()
  end
lackResource()
end