Flywheel Fuel Facilitator

furn = peripheral.wrap("bottom")
chest = peripheral.wrap("top")
args = {...}

function formatTime(s)
    totalTime = s
    hours = math.floor(totalTime/3600)
    totalTime = totalTime % 3600
    minutes = math.floor(totalTime/60)
    seconds = totalTime % 60

    output = ""
    if hours > 0 then
        output = output .. tostring(hours) .. " h "
    end
    if minutes > 0 then
        output = output .. tostring(minutes) .. " m "
    end
    output = output .. tostring(seconds) .. " s"
    return output
end

function showTime(s)
    term.clear()
    term.setCursorPos(1,1)
    print("Powering Flywheel...")
    if s then
        print("Time remaining: " .. formatTime(s))
    else
        print("Time remaining: 'till we run out of fuel or the server crashes!")
    end
end

function loop()
    furn.pullItems("top", 1, 1)
    sleep(0.5)
    chest.pullItems("bottom", 1, 1)
    sleep(0.5)
end

function parse(targs)
    if #targs == 0 then
        return -1
    elseif #targs == 1 then
        return tonumber(targs[1])
    else
        if targs[2] == 'h' then
            return tonumber(targs[1]) * 3600
        elseif targs[2] == 'm' then
            return tonumber(targs[1]) * 60
        elseif targs[2] == 's' then
            return tonumber(targs[1])
        end
    end
end

loops = parse(args)
if loops >= 0 then
    for i = 1, loops do
        showTime(loops - i + 1)
        loop()
    end
else
    while true do
        showTime()
        loop()
    end
end