【框架设计】疲劳值系统：产出节奏与限购的框架

---疲劳值：每日 500 点的额度
function Fatigue.consume(actor, cost)
    local player = class(actor)
    if not player then return end
    local today = os.date("%Y%m%d")
    local dayKey = "Fatigue_" .. today
    local used = tonumber(getplayvar(actor, 2, dayKey)) or 0
    if used >= 500 then
        -- 枯竭：收益减半而非归零
        return "exhausted"
    end
    setplayvar(actor, 2, dayKey, math.min(used + cost, 500), 0)
    return used + cost <= 500 and "normal" or "exhausted"
end

---击杀的疲劳结算：收益的衰减
function killmon(actor, monName)
    local state = Fatigue.consume(actor, 2)
    local exp = MON_EXP[monName] or 100
    if state == "exhausted" then
        exp = math.floor(exp * 0.3)
        sendmsg(actor, 1, "疲劳值已满，收益降低至 30%")
    end
    Group.addExp(actor, exp)
end

---枯竭的引导：疲劳的恢复途径
function Fatigue.recoverTips(actor)
    local player = class(actor)
    if not player then return end
    sendmsg(actor, 1, "恢复途径：每日 6 点重置，" ..
        "或使用疲劳恢复药剂（每日限 2 瓶）")
end

---疲劳药剂：付费与活动的补充
function Fatigue.usePotion(actor)
    local player = class(actor)
    if not player then return false end
    local used = tonumber(getplayvar(actor, 2,
        "FatiguePotion_" .. os.date("%Y%m%d"))) or 0
    if used >= 2 then
        sendmsg(actor, 1, "今日药剂已用完（每日限 2 瓶）")
        return false
    end
    if not checkitemw(actor, "疲劳恢复药剂", 1) then
        sendmsg(actor, 1, "缺少疲劳恢复药剂")
        return false
    end
    takeitem(actor, "疲劳恢复药剂", 1, 0, "疲劳恢复")
    setplayvar(actor, "HUMAN",
        "FatiguePotion_" .. os.date("%Y%m%d"), used + 1, 1)
    setplayvar(actor, 2, "Fatigue_" .. os.date("%Y%m%d"), 0, 0)
    sendmsg(actor, 1, "疲劳值已恢复")
    return true
end