Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by revealing 1 Level 7 or higher monster from your hand. You can only Special Summon "Angel O1" once per turn this way. While you control this Special Summoned card, you can Tribute Summon 1 Level 7 or higher monster in Attack Position during your Main Phase, in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)
--エンジェルＯ１
--Angel O1
--Scripted by Rundas
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--Additional Tribute Summon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_EXTRA_SUMMON_COUNT)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(LOCATION_HAND,0)
	e2:SetCondition(s.con)
	e2:SetTarget(aux.TargetBoolFunction(Card.IsLevelAbove,7))
	e2:SetValue(1)
	c:RegisterEffect(e2)
end
function s.filter(c)
	return c:IsLevelAbove(7) and c:IsMonster() and not c:IsPublic()
end
function s.spcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_HAND,0,1,nil)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,c)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_CONFIRM)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_HAND,0,1,1,true,nil)
	if g then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.ConfirmCards(1-tp,g)
	Duel.ShuffleHand(tp)
	g:DeleteGroup()
end
function s.con(e)
	return Duel.IsMainPhase() and e:GetHandler():IsSpecialSummoned()
end