【网络通信】心跳分级：前台后台的心跳间隔切换

-- 心跳分级：档位判定
local INTERVALS = {combat = 15, foreground = 60, background = 300}
local player = class(actor)
local function applyHeartbeatLevel(player, state)
    local sec = INTERVALS[state]
    if sec == nil then
        sec = INTERVALS.foreground
    end
    setplayvar(player, "HUMAN", "HbLevel", state, true)
    setplayvar(player, "HUMAN", "HbInterval", sec, true)
    sendmsg(player, 1, 0, "心跳间隔已调整为 " .. sec .. " 秒。")
    return sec
end

-- 掉线判定：超时容忍
local player = class(actor)
local function checkAlive(player, lastBeatTs, nowTs, inCombat)
    local level = getplayvar(player, "HUMAN", "HbLevel")
    local limit = INTERVALS[level] or 60
    if inCombat then
        limit = INTERVALS.combat * 3
    end
    if nowTs - lastBeatTs > limit * 2 then
        sendmsg(player, 1, 0, "连接已断开，正在保存数据。")
        return false
    end
    return true
end