Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, when a Level 4 or lower Thunder-Type monster(s) is Normal or Special Summoned to the field, inflict 600 damage to your opponent.
--エレキャノン
--Wattcannon
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)
	--damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DAMAGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCountLimit(1,0,EFFECT_COUNT_CODE_SINGLE)
	e2:SetCondition(s.damcon)
	e2:SetTarget(s.damtg)
	e2:SetOperation(s.damop)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
end
function s.filter(c)
	return c:IsFaceup() and c:IsLevelBelow(4) and c:IsRace(RACE_THUNDER)
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.filter,1,nil)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(600)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,600)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end