-- Functions

local function fwd()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function dwn() -- probably not necessary
    while not turtle.down() do
        turtle.digDown()
    end
end

local function betterDig()
    while turtle.detect() do
        turtle.dig()
    end
end

local function fwdRow()
    fwd()

    turtle.turnRight()
    
    betterDig()

    turtle.turnLeft()
    turtle.turnLeft()

    betterDig()

    turtle.turnRight()
end

local function dwnRow()
    dwn()

    turtle.turnRight()

    betterDig()

    turtle.turnLeft()
    turtle.turnLeft()

    betterDig()

    turtle.turnRight()
end

local function clearFace()
    for i = 1, 4 do
        turtle.up()
    end
    fwdRow()
    for i = 1, 5 do
        dwnRow()
    end
end

local function climb()
    turtle.up()
    fwd()
end

-- Main

print("How deep?")
local d = read()

-- TODO: Fuel check
-- Fuel per level is 36

if turtle.getFuelLevel() < d * 36 then
    print("I need at least ".. (d * 36) .. " levels of fuel for that")
end


for i = 1, d do
    clearFace()
end

turtle.turnRight()
turtle.turnRight()

for i = 1, d do
    climb()
end