Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target a number of monsters on the field and/or in the GYs, equal to the difference between your banished cards and your opponent's; banish them, then your opponent can Special Summon 1 monster from their Deck. You can only activate 1 "Gigantic Thundercross" per turn.
--ギガンティック・サンダークロス
--Gigantic Thundercross
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Banish monster on the field/GY
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_REMOVE+CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER_E)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsMonster() and c:IsAbleToRemove()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE|LOCATION_GRAVE) and s.filter(chkc) end
	local ct=math.abs(Duel.GetFieldGroupCount(tp,LOCATION_REMOVED,0)-Duel.GetFieldGroupCount(tp,0,LOCATION_REMOVED))
	if chk==0 then return ct>0 and Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE|LOCATION_GRAVE,LOCATION_MZONE|LOCATION_GRAVE,ct,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE|LOCATION_GRAVE,LOCATION_MZONE|LOCATION_GRAVE,ct,ct,nil)
	Duel.SetOperationInfo(0,CATEGORY_REMOVE,g,1,0,0)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,1-tp,LOCATION_DECK)
end
function s.spfilter(c,e,tp)
	return c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local rg=Duel.GetTargetCards(e)
	if #rg==0 then return end
	if Duel.Remove(rg,POS_FACEUP,REASON_EFFECT)>0 and Duel.GetLocationCount(1-tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,1-tp,LOCATION_DECK,0,1,nil,e,1-tp)
		and Duel.SelectYesNo(1-tp,aux.Stringid(id,1)) then
		Duel.Hint(HINT_SELECTMSG,1-tp,HINTMSG_SPSUMMON)
		local sg=Duel.SelectMatchingCard(1-tp,s.spfilter,1-tp,LOCATION_DECK,0,1,1,nil,e,1-tp)
		if #sg>0 then
			Duel.BreakEffect()
			Duel.SpecialSummon(sg,0,1-tp,1-tp,false,false,POS_FACEUP)
		end
	end
end