Turtle Mining

args = {...}
distance = args[1]

function CheckFuel()
    if turtle.getFuelLevel() < 10 then
        for i=1, 16 do
            turtle.select(i)
            if turtle.refuel(0) == true then
                turtel.refuel(1)
                return;
            end
        end
    end
    turtle.select(1)
end

function CheckForStorage()
    if turtle.getItemCount(16) > 0 then
        print("Full! Attempting unloading.")
        turtle.turnLeft()
        turtle.turnLeft()
        turtle.select(1)
        turtle.place()
        turtle.select(2)
        if turtle.drop() == true then
            for i=3, 16 do
                turtle.select(i)
                turtle.drop()
            end
        end
        if turtle.getItemCount(16) > 0 then
            print("Can't unload. First slot was not a chest!")
            turtle.dig()
            print("Waiting for inventory to be empty")
            while turtle.getItemCount(16) > 0 do
                sleep(1)
            end
        end
        turtle.turnLeft()
        turtle.turnLeft()
    end
end


function MineAboveBelow()
    while turtle.detectUp() do
        CheckForStorage()
        turtle.digUp()
    end
    while turtle.detectDown() do
        CheckForStorage()
        turtle.digDown()
    end
end

function MineInFront()
    while turtle.detect() do
        CheckForStorage()
        turtle.dig()
    end
end

function MineLayer()
    MineAboveBelow()
    turtle.turnLeft()
    MineInFront()
    turtle.forward()
    MineAboveBelow()
    turtle.back()
    turtle.turnRight()
    turtle.turnRight()
    MineInFront()
    turtle.forward()
    MineAboveBelow()
    turtle.back()
    turtle.turnLeft()
end

for i=1, distance do
    CheckForStorage()
    CheckFuel()
    if turtle.getFuelLevel() < 10 then
        print("Waiting for fuel...")
        while turtle.getFuelLevel < 10 do
            CheckFuel()
        end
        print("Resuming.")
    end
    MineInFront()
    turtle.forward()
    MineLayer()
end
print("Mining complete!")