2

function fuelLevel()
  if turtle.getFuelLevel() < 1000 then
    turtle.select(1)
    turtle.refuel(8)
    print("Refueled")
  else
    print("Enough Fuel")
  end
end

-- Function to move coal to slot 1 if below 40
local function moveCoalToSlot1()
  local coalSlot = 1
  local currentCoalCount = turtle.getItemCount(coalSlot)
  local maxCoalCount = 40  -- Adjust this value as needed

  if currentCoalCount < maxCoalCount then
    for slot = 2, 16 do  -- Start from slot 2 to avoid interfering with other items
      local item = turtle.getItemDetail(slot)

      if item and item.name == "minecraft:coal" then
        turtle.select(slot)
        turtle.transferTo(coalSlot)
        return true
      end
    end
  end

  return false
end

function mine()
  while turtle.detect() do
    turtle.dig()
    sleep(0.5)
  end
  turtle.forward()
  while turtle.detectUp() do
    turtle.digUp()
    sleep(0.5)
  end
  turtle.digDown()
end

function checkFull()
  if turtle.getItemCount(16) > 0 then
    -- Move to the designated chest drop-off point
    turtle.back()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()

    -- Place a chest if there's no chest below already
    turtle.select(3)
    if not turtle.detectDown() then
      turtle.placeDown()
    end

    -- Drop items from slots 4 to 16 into the chest
    for i = 4, 16 do
      turtle.select(i)
      turtle.dropDown()
    end

    -- Move back to the mining position
    turtle.select(2)  -- Select torches again
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
  end
end

print("Place fuel in slot 1, torches in slot 2, and chests in slot 3!")
print("How wide will the tunnel be?")
local x = tonumber(read())

turtle.select(2)
turtle.placeDown()

while true do
  for i = 1, 9 do
    turtle.select(2)
    fuelLevel()
    moveCoalToSlot1()  -- Check and move coal to slot 1 if needed
    checkFull()
    mine()
    turtle.turnLeft()
    for j = 1, ((x / 2) - 0.5) do
      mine()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for j = 1, (x - 1) do
      mine()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for j = 1, ((x / 2) - 0.5) do
      turtle.forward()
    end
    turtle.turnRight()
  end
  turtle.select(2)
  turtle.placeDown()
end