【进阶实战】护盾系统：优先扣盾的伤害吸收封装

local function gainShield(actor, amount, seconds)
    local shield = tonumber(getplayvar(actor, 0, "Shield")) or 0
    setplayvar(actor, 0, "Shield", math.min(shield + amount, 3000), 0)
    setplayvar(actor, 0, "ShieldUntil", os.time() + seconds, 0)
    sendmsg(actor, 1, "获得护盾 " .. amount .. "，持续 " .. seconds .. " 秒。")
end

local function applyDamage(actor, dmg)
    local shield = tonumber(getplayvar(actor, 0, "Shield")) or 0
    if os.time() > (tonumber(getplayvar(actor, 0, "ShieldUntil")) or 0) then
        shield = 0
    end
    local toShield = math.min(shield, dmg)
    local toHp = dmg - toShield
    setplayvar(actor, 0, "Shield", shield - toShield, 0)
    local hp = tonumber(getplayvar(actor, 0, "HP")) or 0
    setplayvar(actor, 0, "HP", hp - toHp, 0)
    if toShield > 0 and toHp > 0 then
        sendmsg(actor, 1, "破盾！剩余伤害 " .. toHp .. " 由生命承担。")
    end
end