Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Your opponent cannot target face-down Defense Position monsters you control with card effects. Monsters you control that were flipped face-up while this card was face-up on the field gain 1500 ATK/DEF. If this card in its owner's Spell & Trap Zone is destroyed by an opponent's card effect: You can target 1 monster in your GY; Special Summon it in face-down Defense Position.
--地中界の厄災
--Terrors in the Hidden City
--Scripted by DyXel
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--Opponent cannot target your face-down Defense Position monsters
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE+EFFECT_FLAG_SET_AVAILABLE)
	e2:SetCode(EFFECT_CANNOT_BE_EFFECT_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetTarget(function(_,c) return c:IsPosition(POS_FACEDOWN_DEFENSE) end)
	e2:SetValue(aux.tgoval)
	c:RegisterEffect(e2)
	--Register a flag to monsters that are flipped face-up
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e3:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e3:SetCode(EVENT_FLIP)
	e3:SetRange(LOCATION_SZONE)
	e3:SetOperation(s.flipop)
	c:RegisterEffect(e3)
	--Increase the ATK/DEF of flipped monsters by 1500
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_FIELD)
	e4:SetCode(EFFECT_UPDATE_ATTACK)
	e4:SetRange(LOCATION_SZONE)
	e4:SetTargetRange(LOCATION_MZONE,0)
	e4:SetTarget(function(e,c) return c:GetFlagEffect(e:GetHandler():GetFieldID())>0 end)
	e4:SetValue(1500)
	c:RegisterEffect(e4)
	local e5=e4:Clone()
	e5:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e5)
	--Special Summon 1 monster from GY in face-down Defense Position
	local e6=Effect.CreateEffect(c)
	e6:SetDescription(aux.Stringid(id,0))
	e6:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e6:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e6:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e6:SetCode(EVENT_DESTROYED)
	e6:SetCondition(s.spcon)
	e6:SetTarget(s.sptg)
	e6:SetOperation(s.spop)
	c:RegisterEffect(e6)
end
function s.flipop(e,tp,eg,ep,ev,re,r,rp)
	local fid=e:GetHandler():GetFieldID() --in case we have multiples, the id will not be enough
	for tc in eg:Iter() do
		tc:RegisterFlagEffect(fid,RESET_EVENT|RESETS_STANDARD,0,1)
	end
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return rp==1-tp and c:IsReason(REASON_EFFECT) and c:IsPreviousControler(tp) and c:IsPreviousLocation(LOCATION_SZONE)
end
function s.spfilter(c,e,tp)
	return c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEDOWN_DEFENSE)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,tp,LOCATION_GRAVE)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEDOWN_DEFENSE)>0 then
		Duel.ConfirmCards(1-tp,tc)
	end
end