RandomUtil = {}


--根据权重随机词条数量
function RandomUtil.random_weighted(weight_str, count)

    local result = {}
    if count <= 0 then
        return result
    end

    local num = string.split(weight_str, "|")
    local weight_total = 0

    for _, value in pairs(num) do
        local sum = string.split(value, "#")
        weight_total = weight_total + tonumber(sum[2])
    end

    local random_weight = math.random(1, weight_total)
    local cumulative_weight = 0
    for _, value in pairs(num) do
        local sum = string.split(value, "#")
        local weight = tonumber(sum[2])
        cumulative_weight = cumulative_weight + weight
        if cumulative_weight >= random_weight then
            table.insert(result, tonumber(sum[1]))
            if table.count(result) == count then
                return result
            end
        end
    end
end

-- 示例："1#80|2#10|3#10"
-- 80%的概率选中1
-- 10%的概率选中2
-- 80%的概率选中3
function RandomUtil.selectKey(configStr)
    local results = RandomUtil.random_weighted(configStr, 1)
    local num = results[1]
    return num;
end