BuildStaircase

local tArgs = { ... }

-- turtle.select(1)
-- local slot=1

local function refuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" or fuelLevel > 0 then
        return
    end

    local function tryRefuel()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                turtle.select(n)
                if turtle.refuel(1) then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    if not tryRefuel() then
        print( "Add more fuel to continue." )
        while not tryRefuel() do
            sleep(1)
        end
        print( "Resuming..." )
    end
end

function turnR(n)
    if n == nil then n=1 end
    for i = 1,n do
        turtle.turnRight()
    end
end

function turnL(n)
    if n == nil then n=1 end
    for i = 1,n do
        turtle.turnLeft()
    end
end

function go(n)
    refuel()
    if n == nil then n=1 end
    for i = 1,n do
        turtle.forward()
    end
end

function back(n)
    refuel()
    if n == nil then n=1 end
    for i = 1,n do
        turtle.back()
    end
end

function down(n)
    refuel()
    if n == nil then n=1 end
    for i = 1,n do
        if not turtle.down() then
            return false
        end
    end
    return true
end

function up(n)
    refuel()
    if n == nil then n=1 end
    for i = 1,n do
        turtle.up()
    end
end

function place(item)


    function checkRessources()
        if item == "block" then
            turtle.select(1)
            for i = 1,4 do
                if turtle.getItemCount(i) > 0 then
                    turtle.select(i)
                    return true
                end
            end
        elseif item == "stair" then
            turtle.select(5)
            for i = 5,8 do
                if turtle.getItemCount(i) > 0 then
                    turtle.select(i)
                    return true
                end
            end
        end
        return false
    end

    if not checkRessources() then
        print( "Add more Ressources to continue." )
        while not checkRessources() do
            sleep(1)
        end
        print( "Resuming..." )
    end

    turtle.place()
end

function placeDown(item)


    function checkRessources()
        if item == "block" then
            turtle.select(1)
            for i = 1,4 do
                if turtle.getItemCount(i) > 0 then
                    turtle.select(i)
                    return true
                end
            end
        elseif item == "stair" then
            turtle.select(5)
            for i = 5,8 do
                if turtle.getItemCount(i) > 0 then
                    turtle.select(i)
                    return true
                end
            end
        end
        return false
    end

    if not checkRessources() then
        print( "Add more Ressources to continue." )
        while not checkRessources() do
            sleep(1)
        end
        print( "Resuming..." )
    end

    turtle.placeDown()
end




-- find start pos
go(2)
turnR()
go()
down()
-- loop


local done=false
while not done do
    place("block")
    turnR()
    back()
    place("block")
    turnR()
    back()
    place("block")
    turnL()
    back()
    place("block")
    back()
    for i = 1,3 do
        place("stair")
        if not down() then done=true break end
        place("block")
        up()
        if i % 2 == 0 then
                turnL()
            else
                turnR()
        end
        go()
        if i % 2 == 0 then
                turnR()
            else
                turnL()
        end
        place("stair")
        if not down() then done= true break end
        place("block")
        back()
    end
end

print("finished")


--]]