Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During your Main Phase 1, FIRE Dragon monsters you control are unaffected by your opponent's activated effects. During your Main Phase: You can add 1 "Tenpai Dragon" monster from your Deck to your hand, then discard 1 card. You can only use this effect of "Sangen Summoning" once per turn. If this card is destroyed during the Battle Phase: You can target 1 Dragon Synchro Monster you control; double its ATK.
--盃満ちる燦幻荘
--Sangen Summoning
--scripted by Naim
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)
	--FIRE Dragon monsters you control are unaffected by your opponent's activated effects during your Main Phase 1
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_IMMUNE_EFFECT)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetRange(LOCATION_FZONE)
	e2:SetCondition(function(e) return Duel.IsTurnPlayer(e:GetHandlerPlayer()) and Duel.IsPhase(PHASE_MAIN1) end)
	e2:SetTarget(function(e,c) return c:IsAttribute(ATTRIBUTE_FIRE) and c:IsRace(RACE_DRAGON) end)
	e2:SetValue(s.immval)
	c:RegisterEffect(e2)
	--Search 1 "Tenpai Dragon" monster from your Deck to your hand, then discard 1 card
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_HANDES)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetRange(LOCATION_FZONE)
	e3:SetCountLimit(1,id)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
	--Double the ATK of 1 Dragon Synchro Monster you control
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_ATKCHANGE)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e4:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e4:SetCode(EVENT_DESTROYED)
	e4:SetCondition(function() return Duel.IsBattlePhase() end)
	e4:SetTarget(s.atktg)
	e4:SetOperation(s.atkop)
	c:RegisterEffect(e4)
end
s.listed_series={SET_TENPAI_DRAGON}
function s.immval(e,te)
	return te:GetOwnerPlayer()==1-e:GetHandlerPlayer() and te:IsActivated()
end
function s.thfilter(c)
	return c:IsSetCard(SET_TENPAI_DRAGON) and c:IsMonster() and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,1,tp,1)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 and Duel.SendtoHand(g,nil,REASON_EFFECT)>0 then
		Duel.ConfirmCards(1-tp,g)
		Duel.ShuffleHand(tp)
		Duel.BreakEffect()
		Duel.DiscardHand(tp,nil,1,1,REASON_EFFECT|REASON_DISCARD,nil)
	end
end
function s.atkfilter(c)
	return c:IsFaceup() and c:IsRace(RACE_DRAGON) and c:IsType(TYPE_SYNCHRO)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.atkfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.atkfilter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATKDEF)
	local tc=Duel.SelectTarget(tp,s.atkfilter,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_ATKCHANGE,tc,1,tp,tc:GetFirst():GetAttack())
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() then
		--Its ATK becomes doubled
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(tc:GetAttack()*2)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
	end
end