Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control a "Tistina" card: You can Special Summon this card from your hand, then you can add 1 "Tistina" Spell/Trap from your Deck to your hand. During your opponent's turn, if you control "Crystal God Tistina" (Quick Effect): You can change as many monsters your opponent controls as possible to face-down Defense Position, then you can send all face-up cards your opponent controls to the GY. You can only use each effect of "Demigod of the Tistina" once per turn.
--ティスティナの半神
--Demigod of the Tistina
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon this card
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_SEARCH+CATEGORY_TOHAND)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--Flip opponent's monsters face-down
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_POSITION+CATEGORY_TOGRAVE)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetHintTiming(0,TIMINGS_CHECK_MONSTER_E|TIMING_MAIN_END)
	e2:SetCondition(s.poscon)
	e2:SetTarget(s.postg)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
end
s.listed_names={CARD_CRYSTAL_GOD_TISTINA}
s.listed_series={SET_TISTINA}
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_TISTINA),tp,LOCATION_ONFIELD,0,1,nil)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,c,1,0,0)
	Duel.SetPossibleOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thfilter(c)
	return c:IsSetCard(SET_TISTINA) and c:IsSpellTrap()
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP)>0
		and Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil)
		and Duel.SelectYesNo(tp,aux.Stringid(id,2)) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
		local g=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil)
		if #g==0 then return end
		Duel.BreakEffect()
		Duel.SendtoHand(g,tp,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(1-tp)
		and Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsCode,CARD_CRYSTAL_GOD_TISTINA),tp,LOCATION_ONFIELD,0,1,nil)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,nil)
	if chk==0 then return #g>0 end
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
	Duel.SetPossibleOperationInfo(0,CATEGORY_TOGRAVE,nil,1,1-tp,LOCATION_ONFIELD)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,nil)
	if #g==0 or Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)==0 then return end
	local gg=Duel.GetMatchingGroup(Card.IsFaceup,tp,0,LOCATION_ONFIELD,nil)
	if #gg>0 and Duel.SelectYesNo(tp,aux.Stringid(id,3)) then
		Duel.BreakEffect()
		Duel.SendtoGrave(gg,REASON_EFFECT)
	end
end