Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 WATER Tuner + 1+ non-Tuner monsters Once per Chain, if your opponent Special Summons a monster(s) (except during the Damage Step): You can Special Summon 1 "Ice Barrier" monster from your hand, Deck, Extra Deck, or GY, then you can change 1 Attack Position monster your opponent controls to Defense Position. You can only use this effect of "Lancea, Ancestral Dragon of the Ice Mountain" twice per turn. If this face-up Synchro Summoned card in its owner's control leaves the field because of an opponent's card: You can Special Summon 1 "Ice Barrier" Synchro Monster from your Extra Deck. (This is treated as a Synchro Summon.)
--氷霊山の龍祖 ランセア
--Lancea, Ancestral Dragon of the Ice Mountain
--Scripted by fiftyfour
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--Synchro Summon procedure
	Synchro.AddProcedure(c,aux.FilterBoolFunctionEx(Card.IsAttribute,ATTRIBUTE_WATER),1,1,Synchro.NonTuner(nil),1,99)
	--Special Summon 1 "Ice Barrier" monster from your hand, Deck, Extra Deck, or GY
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(2,id)
	e1:SetCondition(function(e,tp,eg) return eg:IsExists(Card.IsSummonPlayer,1,nil,1-tp) end)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--Special Summon 1 "Ice Barrier" Synchro Monster from your Extra Deck
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_LEAVE_FIELD)
	e2:SetCondition(s.exspcon)
	e2:SetTarget(s.exsptg)
	e2:SetOperation(s.exspop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_ICE_BARRIER}
local LOCATION_HAND_DECK_EXTRA_GRAVE=LOCATION_HAND|LOCATION_DECK|LOCATION_EXTRA|LOCATION_GRAVE
function s.spfilter(c,e,tp)
	if not (c:IsSetCard(SET_ICE_BARRIER) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)) then return false end
	if c:IsLocation(LOCATION_EXTRA) then
		return Duel.GetLocationCountFromEx(tp,tp,nil,c)>0
	else
		return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
	end
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return not c:HasFlagEffect(id) and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_HAND_DECK_EXTRA_GRAVE,0,1,nil,e,tp) end
	c:RegisterFlagEffect(id,RESET_EVENT|RESETS_STANDARD|RESET_CHAIN,0,1)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND_DECK_EXTRA_GRAVE)
	Duel.SetPossibleOperationInfo(0,CATEGORY_POSITION,nil,1,1-tp,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.spfilter),tp,LOCATION_HAND_DECK_EXTRA_GRAVE,0,1,1,nil,e,tp)
	if #g==0 or Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)==0 then return end
	if Duel.IsExistingMatchingCard(aux.AND(Card.IsAttackPos,Card.IsCanChangePosition),tp,0,LOCATION_MZONE,1,nil)
		and Duel.SelectYesNo(tp,aux.Stringid(id,2)) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_POSCHANGE)
		local posg=Duel.SelectMatchingCard(tp,aux.AND(Card.IsAttackPos,Card.IsCanChangePosition),tp,0,LOCATION_MZONE,1,1,nil)
		if #posg==0 then return end
		Duel.HintSelection(posg,true)
		Duel.BreakEffect()
		Duel.ChangePosition(posg,POS_FACEUP_DEFENSE,POS_FACEDOWN_DEFENSE)
	end
end
function s.exspcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return rp==1-tp and c:IsPreviousPosition(POS_FACEUP) and c:IsPreviousLocation(LOCATION_MZONE) and c:IsPreviousControler(tp)
		and c:IsSynchroSummoned()
end
function s.exspfilter(c,e,tp)
	return c:IsSetCard(SET_ICE_BARRIER) and c:IsType(TYPE_SYNCHRO) and Duel.GetLocationCountFromEx(tp,tp,nil,c)>0
		and c:IsCanBeSpecialSummoned(e,SUMMON_TYPE_SYNCHRO,tp,false,false)
end
function s.exsptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.exspfilter,tp,LOCATION_EXTRA,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.exspop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local tc=Duel.SelectMatchingCard(tp,s.exspfilter,tp,LOCATION_EXTRA,0,1,1,nil,e,tp):GetFirst()
	if tc and Duel.SpecialSummon(tc,SUMMON_TYPE_SYNCHRO,tp,tp,false,false,POS_FACEUP)>0 then
		tc:CompleteProcedure()
	end
end