treefarm

-- Tree-Farm Turtle (based on existing public script)

local sapling_name = "sapling"
local min_fuel = 20

-- Detect item in inventory by name
local function findSlot(itemName)
    for i = 1,16 do
        local d = turtle.getItemDetail(i)
        if d and string.find(d.name, itemName) then
            return i
        end
    end
    return nil
end

-- Fuel-check and refuel
local function refuelIfNeeded(fuelSlot)
    turtle.select(fuelSlot)
    while turtle.getFuelLevel() < min_fuel do
        if turtle.getItemCount(fuelSlot) == 0 then
            print("Need more fuel in slot " .. fuelSlot)
            return false
        end
        turtle.refuel(1)
    end
    return true
end

-- Climb and harvest
local function harvestColumn()
    -- go up harvesting
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
    end
    -- go down back to base
    while turtle.down() do end
end

-- Plant sapling below when possible
local function plantBelow(saplingSlot)
    turtle.select(sapplingSlot)
    if turtle.getItemCount(sapplingSlot) > 0 and not turtle.detectDown() then
        turtle.placeDown()
    end
end

-- Main loop
local saplingSlot = findSlot(sapling_name)
local fuelSlot = findSlot("coal") or findSlot("charcoal")

if not saplingSlot then
    error("No sapling slot found.")
end
if not fuelSlot then
    error("No fuel slot found.")
end

while true do
    if not refuelIfNeeded(fuelSlot) then
        break
    end

    -- Plant, harvest, collect, then replant
    plantBelow(saplingSlot)
    harvestColumn()

    -- Collect dropped items around (down / up / forward)
    for i = 1,16 do
        turtle.select(i)
        turtle.suck()
        turtle.suckUp()
        turtle.suckDown()
    end

    -- Drop into a chest below
    for i = 1,16 do
        turtle.select(i)
        local count = turtle.getItemCount(i)
        if count > 0 and i ~= sapplingSlot and i ~= fuelSlot then
            turtle.dropDown(count)
        end
    end

    print("Cycle complete, refueling and replanting...")
end