Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Special Summon this card in Defense Position as an Effect Monster (Zombie/DARK/Level 4/ATK 1800/DEF 500). (This card is also still a Trap.) If this card Summoned this way is destroyed by battle: Inflict damage to your opponent equal to the ATK of the monster that destroyed it.
--死霊ゾーマ
--Zoma the Spirit
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and 
		Duel.IsPlayerCanSpecialSummonMonster(tp,id,0,TYPE_MONSTER|TYPE_EFFECT,1800,500,4,RACE_ZOMBIE,ATTRIBUTE_DARK) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToEffect(e) then return end
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0
		or not Duel.IsPlayerCanSpecialSummonMonster(tp,id,0,TYPE_MONSTER|TYPE_EFFECT,1800,500,4,RACE_ZOMBIE,ATTRIBUTE_DARK) then return end
	c:AddMonsterAttribute(TYPE_EFFECT+TYPE_TRAP)
	Duel.SpecialSummonStep(c,0,tp,tp,true,false,POS_FACEUP_DEFENSE)
	c:AddMonsterAttributeComplete()
	--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:SetCode(EVENT_LEAVE_FIELD)
	e1:SetCondition(s.damcon)
	e1:SetTarget(s.damtg)
	e1:SetOperation(s.damop)
	e1:SetReset(RESET_EVENT|RESETS_CANNOT_ACT&~(RESET_TOGRAVE|RESET_REMOVE))
	c:RegisterEffect(e1,true)
	Duel.SpecialSummonComplete()
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsReason(REASON_BATTLE)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local bc=e:GetHandler():GetBattleTarget()
	local dam=bc:GetAttack()
	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