【引擎触发】召唤神兽：神兽 AI 的跟随、攻击与重生

-- 召唤物 AI 心跳：每 500 毫秒一次
function PetAI.tick(pet)
    local owner = pet:GetOwner()
    local dist = pet:DistTo(owner)
    if pet.target and pet.target:IsDead() then pet.target = nil end
    if not pet.target then
        pet.target = PetAI.findEnemy(pet, owner)
    end
    if pet.target then
        pet:ChaseAndAttack(pet.target)
    elseif dist > 4 then
        pet:FollowOwner(owner, 2)
    end
end

function PetAI.findEnemy(pet, owner)
    if owner.lastAttacker and not owner.lastAttacker:IsDead() then
        return owner.lastAttacker
    end
    return QF_FindNearMonster(pet, 5)
end

function QF.PetDead(pet)
    local owner = pet:GetOwner()
    owner:SetCooldown("summon_beast", 60)
    owner:SendMsg("神兽阵亡，60 秒后可重新召唤")
end