controller

-- turtle must be initialized facing positive X axis

-- variables
local x = 0
local y = 0
local z = 0
local r = 0

-- local ws, err = http.websocket("ws://localhost:12703")

-- useful methods

--function confirm()
--    ws.send("t")
--end

--function aborted()
--    ws.send("f")
--end

function up()
    if turtle.up() then
        y = y + 1
        --confirm()
    else
        --aborted()
    end
end

function down()
    if turtle.down() then
        y = y - 1
        --confirm()
    else
        --aborted()
    end
end

function normalized(int)
    local t = int
    while (t < 0) do
        t = t + 4
    end
    while(t > 3) do
        t = t - 4
    end
    return r - int
end

function rotate(nr)
    local norm = normalized(nr)
    while nr ~= 0 do
        if nr > 0 then
            nr = nr - 1
            r = r - 1
            turtle.turnLeft()
        else
            nr = nr + 1
            r = r + 1
            turtle.turnRight()
        end
    end
end

-- actual turtle loop
up()
down()
rotate(2)
rotate(5)
rotate(3)
rotate(0)