登录累计奖励：连登天数的阶梯礼包

local GIFTS = {1, 2, 3, 5, 8, 12, 20}   -- 7 天阶梯
local function onLoginDay(actor)
    local today = os.date("%Y%m%d")
    if getplayvar(actor, "loginDay") == today then
        return   -- 同一天只结算一次
    end
    local yesterday = os.date("%Y%m%d", os.time() - 86400)
    local streak = (getplayvar(actor, "loginDay") == yesterday)
        and (getplayvar(actor, "loginStreak") or 0) + 1 or 1
    setplayvar(actor, "loginStreak", streak)
    setplayvar(actor, "loginDay", today)
    local tier = math.min(streak, 7)
    giveitem(actor, 3100 + tier, GIFTS[tier])
    sendmsg(actor, 1, "连登 " .. streak .. " 天，领第 " .. tier .. " 档")
end

local function queryGift(actor)
    local streak = getplayvar(actor, "loginStreak") or 0
    sendmsg(actor, 1, "当前连登 " .. streak .. " 天，明日第 "
        .. math.min(streak + 1, 7) .. " 档")
end