Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If there is no face-up "Kozaky" on the field, destroy this card. If this face-up card is destroyed, inflict damage equal to the original ATK of this card to its current controller.
--G・コザッキー
--Giant Kozaky
local s,id=GetID()
function s.initial_effect(c)
	--self destroy
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_SELF_DESTROY)
	e1:SetCondition(s.sdcon)
	c:RegisterEffect(e1)
	--damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DAMAGE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_LEAVE_FIELD)
	e2:SetCondition(s.dmcon)
	e2:SetTarget(s.dmtg)
	e2:SetOperation(s.dmop)
	c:RegisterEffect(e2)
end
s.listed_names={99171160}
function s.sdfilter(c)
	return c:IsFaceup() and c:IsCode(99171160)
end
function s.sdcon(e)
	return not e:GetHandler():IsStatus(STATUS_BATTLE_DESTROYED)
		and not Duel.IsExistingMatchingCard(s.sdfilter,0,LOCATION_ONFIELD,LOCATION_ONFIELD,1,nil)
end
function s.dmcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsReason(REASON_DESTROY) and c:IsPreviousPosition(POS_FACEUP)
end
function s.dmtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local c=e:GetHandler()
	Duel.SetTargetPlayer(c:GetPreviousControler())
	Duel.SetTargetParam(2500)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,c:GetPreviousControler(),2500)
end
function s.dmop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end