Recursive Tree Miner

local acceptedItems = {
    "Natura:Dark Tree",
    "Natura:Dark Leaves",
    "minecraft:log",
    "minecraft:leaves"
}

local plantItem = "minecraft:sapling"
local fuelItem = "minecraft:log"

function checkData(d)
    for _, v in ipairs(acceptedItems) do
        if d.name == v then
            return true
        end
    end
    return false
end

function checkRefuel()
    if turtle.getFuelLevel() < 100 then
        reorganize()
        turtle.select(16)
        turtle.refuel(turtle.getItemCount(16))
    end
end

function breakTree()
    checkRefuel()
    local block, data = turtle.inspect()
    if block and checkData(data) then
        turtle.dig()
        turtle.suck()
        turtle.forward()
        breakTree()
        turtle.back()
    end
    local block, data = turtle.inspectUp()
    if block and checkData(data) then
        turtle.digUp()
        turtle.suckUp()
        turtle.up()
        breakTree()
        turtle.down()
    end
    local block, data = turtle.inspectDown()
    if block and checkData(data) then
        turtle.digDown()
        turtle.suckDown()
        turtle.down()
        breakTree()
        turtle.up()
    end
    turtle.turnLeft()
    local block, data = turtle.inspect()
    if block and checkData(data) then
        turtle.dig()
        turtle.suck()
        turtle.forward()
        breakTree()
        turtle.back()
    end
    turtle.turnRight()
    turtle.turnRight()
    local block, data = turtle.inspect()
    if block and checkData(data) then
        turtle.dig()
        turtle.suck()
        turtle.forward()
        breakTree()
        turtle.back()
    end
    turtle.turnLeft()
end

function plantSapling()
    turtle.select(1)
    turtle.place()
end

function reorganize()
    for i = 1, 16 do
        turtle.select(i)
        local data = turtle.getItemDetail()
        if data and data.name == plantItem then
            turtle.transferTo(1)
        elseif data and data.name == fuelItem then
            turtle.transferTo(16)
        end
    end
end

while true do
    local block, data = turtle.inspect()
    if block and checkData(data) then
        breakTree()
        reorganize()
        plantSapling()
    end
end