【Lua实战】定价建议器：参考价的滚动统计实现

local samples = {}
local function addSample(price)
    table.insert(samples, { p = price, t = os.time() })
    if #samples > 30 then
        table.remove(samples, 1)
    end
end
local function suggestPrice()
    local sum, wsum = 0, 0
    local now = os.time()
    for _, s in ipairs(samples) do
        local w = 3 - math.floor((now - s.t) / 3600)
        if w < 1 then w = 1 end
        sum = sum + s.p * w
        wsum = wsum + w
    end
    if wsum == 0 then return 0 end
    return math.floor(sum / wsum)
end

local function feedPrice(price)
    local base = suggestPrice()
    if base > 0 and (price > base * 5 or price < base / 5) then
        setsysvar("PRICE_OUTLIER", price)
        return
    end
    addSample(price)
end