roulette, Lua - rextester

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-- Получить шмотку по ID кейса и предметам в кейсе
local function getRandomItemFromCase( caseID, items )
    local chance = 0
    local dropItem = ""
    
    if caseID == 1 then
        --[[ Шансы выпадения шмоток
        8 - 1% 
        7 - 3% 
        6 - 5% 
        5 - 8% 
        4 - 13%
        3 - 18%
        2 - 23%
        1 - 29%
        ]]
        -- 8
        chance = math.random(1, 100)
        if (chance > 99) and (chance <= 100) then
            dropItem = "8"
        end
        -- 7
        if (chance > 96) and (chance <= 99) then
            dropItem = "7"
        end
        -- 6
        if (chance > 91) and (chance <= 96) then
            dropItem = "6"
        end
        -- 5
        if (chance > 83) and (chance <= 91) then
            dropItem = "5"
        end
        -- 4
        if (chance > 70) and (chance <= 83) then
            dropItem = "4"
        end
        -- 3
        if (chance > 52) and (chance <= 70) then
            dropItem = "3"
        end
        -- 2
        if (chance > 29) and (chance <= 52) then
            dropItem = "2"
        end
        -- 1
        if (chance > 0) and (chance <= 29) then
            dropItem = "1"
        end
    end
    return dropItem
end

-- Функция перемешивания таблицы
function shuffle(tbl)
    local size = #tbl
    for i = size, 1, -1 do
        local rand = math.random(size)
        tbl[i], tbl[rand] = tbl[rand], tbl[i]
    end
    return tbl
end

-- Функция перемешивания кейса с призом на 25м предмете
local function getShuffledCase(item, items)
    local items_copy = items
    while #items_copy < 30 do
        for i = 1, #items do
            table.insert(items_copy, items[i])
        end
    end
    items_copy = shuffle(items_copy)
    items_copy[25] = item
    return items_copy
end

m = {"a", "b", "c", "d", "e"}
m = getShuffledCase("SUPER", m)
for i = 1, #m do
    print(m[i] .. " " .. i)
end

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Absolute running time: 0.11 sec, cpu time: 0.06 sec, memory peak: 3 Mb, absolute service time: 0,12 sec