Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card can only be Ritual Summoned with the Ritual Spell Card, "Shinato's Ark". You must also Tribute monsters whose total Levels equal 8 or more from the field or your hand. When this card destroys a Defense Position monster and sends it to the Graveyard as a result of battle, inflict damage to your opponent's Life Points equal to the original ATK of the destroyed monster.
--天界王 シナト
--Shinato, King of a Higher Plane
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--damage
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DAMAGE)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EVENT_BATTLE_DESTROYING)
	e1:SetCondition(s.damcon)
	e1:SetTarget(s.damtg)
	e1:SetOperation(s.damop)
	c:RegisterEffect(e1)
end
s.listed_names={60365591}
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return c:IsRelateToBattle() and bc:IsLocation(LOCATION_GRAVE) and bc:IsMonster()
		and (bc:GetBattlePosition()&POS_DEFENSE)~=0
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	local dam=bc:GetBaseAttack()
	if dam<0 then dam=0 end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(dam)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,dam)
end
function s.damop(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