Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Pay any number of Life Points in multiples of 500; reduce the Level of 1 monster you control or that is in your hand by 1 for each 500 Life Points you paid, until the End Phase.
--スター・ブラスト
--Star Blast
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)
	e1:SetCondition(s.con)
	e1:SetCost(s.cost)
	e1:SetTarget(s.tg)
	e1:SetOperation(s.op)
	c:RegisterEffect(e1)
end
function s.con(e,tp,eg,ep,ev,re,r,rp)
	for _,te in ipairs({Duel.GetPlayerEffect(tp,EFFECT_LPCOST_CHANGE)}) do
		local val=te:GetValue()
		if val(te,e,tp,500)~=500 then return false end
	end
	return true
end
function s.filter(c,lv)
	return c:GetLevel()>lv
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	e:SetLabel(1)
	if chk==0 then return true end
end
function s.tg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		if e:GetLabel()~=1 then return false end
		e:SetLabel(0)
		return Duel.CheckLPCost(tp,500) and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_HAND|LOCATION_MZONE,0,1,nil,1)
	end
	local lp=Duel.GetLP(tp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_HAND|LOCATION_MZONE,0,nil,1)
	local tg=g:GetMaxGroup(Card.GetLevel)
	local maxlv=tg:GetFirst():GetLevel()
	local t={}
	local l=1
	while l<maxlv and l*500<=lp do
		t[l]=l*500
		l=l+1
	end
	Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,0))
	local announce=Duel.AnnounceNumber(tp,table.unpack(t))
	Duel.PayLPCost(tp,announce)
	Duel.SetTargetParam(announce/500)
end
function s.op(e,tp,eg,ep,ev,re,r,rp)
	local ct=Duel.GetChainInfo(0,CHAININFO_TARGET_PARAM)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_HAND|LOCATION_MZONE,0,nil,ct)
	if #g>0 then
		Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,1))
		local sg=g:Select(tp,1,1,nil)
		local tc=sg:GetFirst()
		if tc:IsLocation(LOCATION_MZONE) then
			Duel.HintSelection(sg)
		end
		Duel.ConfirmCards(1-tp,sg)
		if tc:IsLocation(LOCATION_HAND) then Duel.ShuffleHand(tp) end
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_LEVEL)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TOFIELD))
		e1:SetValue(-ct)
		tc:RegisterEffect(e1)
	end
end