Turm

local strtPos={[1]=0, [2]=0, [3]=0} --x,y,z
local curPos= {[1]=strtPos[1], [2]=strtPos[2], [3]=strtPos[3]}
local opt1,opt2="<<<",""
local opt=1

function moveForw()
    local try=1
    while not turtle.forward() do
        print("I can't go forward .. try:"..try)
        sleep(1)
        try=try+1
    end
end

function moveBack()
    local try=1
    while not turtle.back() do
        print("I can't go back .. try:"..try)
        sleep(1)
        try=try+1
    end
end

function moveUp()
    local try=1
    while not turtle.up() do
        print("I can't go up .. try:"..try)
        sleep(1)
        try=try+1
    end
    curPos[2]=curPos[2]+1
end

function moveDown()
    local try=1
    while not turtle.down() do
        print("I can't go down .. try:"..try)
        sleep(1)
        try=try+1
    end
    curPos[2]=curPos[2]-1
end

function turnL()
    turtle.turnLeft()
end
function turnR()
    turtle.turnRight()
end
function turn2()
    for A=1,2 do
        turnR()
    end
end

function digForw()
    while turtle.detect() do
        turtle.dig()
    end
    moveForw()
end

function digDown()
    turtle.digDown()
    moveDown()
end

function digUp()
    while turtle.detectUp() do
        turtle.digUp()
    end
    moveUp()
end

function placeForw()
    if not turtle.detect() then
        local try=1
        while not turtle.place() do
            print("I can't place forw. a block !..Try: "..try)
            try=try+1
            sleep(1)
        end
    end
end

function placeUp()
    if not turtle.detectUp() then
        local try=1
        while not turtle.placeUp() do
            print("I can't place up. a block !..Try: "..try)
            try=try+1
            sleep(1)
        end
    end
end

function placeDown()
    if not turtle.detectDown() then
        local try=1
        while not turtle.placeDown() do
             print("I can't place down. a block !..Try: "..try)
             try=try+1
             sleep(1)
        end
    end
end

function selectSlot()
    for A=1,16 do
        if turtle.getItemCount(A)>12 then
            turtle.select(A)
            break
        end
        if A== 16 then
            gotoStrt()
        end
    end
end

function gotoStrt()
    digForw()
    turnL()
    digForw()
    while strtPos[2]~=curPos[2]+1 do
        if opt==1 then moveDown() else moveUp() end
    end
    exit()
end

function buildTower()
    if opt==1 then
        digUp()
        digUp()
        digForw()
        turnL()
        while not turtle.detectUp() do
            for A=1,4 do
                for B=1,3 do
                    digForw()
                    placeDown()
                end
                turnL()
                selectSlot()
            end
            moveUp()
        end
    else
        digDown()
        digDown()
        digForw()
        turnL()
        while not turtle.detectDown() do
            for A=1,4 do
                for B=1,3 do
                    digForw()
                    placeUp()
                end
                turnL()
                selectSlot()
            end
            moveDown()
        end
    end
    gotoStrt()
end

function prntStartScreen()
    term.clear()
    term.setCursorPos(1,1)
    print("Choose your options")
    print("A: build a tower upwards  "..opt1)
    print("B: build a tower downwards  "..opt2)
    term.setCursorPos(1,10)
    print("Enter: to start")

end

function enterOptions()
    while true do
        local check,key=os.pullEvent("key")
        if check then
            if key==keys.a then opt1="<<<" opt2="" opt=1
            elseif key==keys.b then opt1="" opt2="<<<" opt=0
            elseif key==keys.enter then
                term.clear()
                term.setCursorPos(12,5)
                print("START BUILDING")
                term.setCursorPos(12,7)
                textutils.slowPrint("..............",5)
                break
            end
            prntStartScreen()
        end
    end
end

prntStartScreen()
enterOptions()
buildTower()