Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When your opponent would Normal or Special Summon a monster: Discard 1 "Watt" monster; negate the Summon and destroy it.
--エレキャンセル
--Wattcancel
local s,id=GetID()
function s.initial_effect(c)
	--Activate(summon)
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DISABLE_SUMMON+CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_SUMMON)
	e1:SetCondition(s.condition)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EVENT_SPSUMMON)
	c:RegisterEffect(e2)
end
s.listed_series={SET_WATT}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetCurrentChain(true)==0 and eg:IsExists(Card.IsControler,1,nil,1-tp)
end
function s.cfilter(c)
	return c:IsSetCard(SET_WATT) and c:IsMonster() and c:IsDiscardable()
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if Duel.IsPlayerAffectedByEffect(tp,EFFECT_DISCARD_COST_CHANGE) then return true end
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,s.cfilter,1,1,REASON_COST|REASON_DISCARD,nil)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=eg:Filter(Card.IsControler,nil,1-tp)
	Duel.SetOperationInfo(0,CATEGORY_DISABLE_SUMMON,g,#g,0,0)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=eg:Filter(Card.IsControler,nil,1-tp)
	Duel.NegateSummon(g)
	Duel.Destroy(g,REASON_EFFECT)
end