【框架设计】回流召回：判定条件与礼包补发

local RETURN_GAP = 86400 * 30
function Return.check(plr)
    local gap = os.time() - (plr.lastLogoutAt or 0)
    if gap < RETURN_GAP then return false end
    if plr.level < 40 then return false end
    plr.returnUntil = os.time() + 86400 * 7
    QF_SetTitle(plr, "荣归玛法")
    QF_MailItems(plr.id, RETURN_PACK, "回流专属礼包")
    return true
end

function Return.invite(plr, friendId)
    local friend = QF_GetPlayer(friendId)
    if not friend or friend.online then return false, "好友在线" end
    local gap = os.time() - (friend.lastLogoutAt or 0)
    if gap < RETURN_GAP then return false, "好友未流失" end
    if plr.invitedToday >= 3 then return false, "今日邀请已满" end
    plr.invitedToday = plr.invitedToday + 1
    QF_SendOfflineMail(friendId, {
        from = plr.id, kind = "return_invite", at = os.time(),
    })
    return true
end