Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no monsters in your Main Monster Zone: Target 1 face-up Effect Monster on the field; negate that face-up monster's effects until the end of this turn, then, if you have 3 or more Spells in your GY, you can take control of that monster until the End Phase.
--閃刀機－ウィドウアンカー
--Sky Striker Mecha - Widow Anchor
--Scripted by ahtelel
local s,id=GetID()
function s.initial_effect(c)
	--Negate the effects of a face-up monster on the field
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DISABLE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return not Duel.IsExistingMatchingCard(Card.IsInMainMZone,tp,LOCATION_MZONE,0,1,nil)
end
function s.filter(c)
	return c:IsFaceup() and c:IsType(TYPE_EFFECT) and not c:IsDisabled()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	if Duel.GetMatchingGroupCount(Card.IsSpell,tp,LOCATION_GRAVE,0,nil)>=3 then
		e:SetCategory(CATEGORY_DISABLE|CATEGORY_CONTROL)
	end
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) and not tc:IsDisabled() then
		tc:NegateEffects(c,RESET_PHASE|PHASE_END)
		Duel.AdjustInstantly(tc)
		if Duel.GetMatchingGroupCount(Card.IsSpell,tp,LOCATION_GRAVE,0,nil)>=3 and tc:IsControlerCanBeChanged()
			and tc:IsControler(1-tp) and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
			Duel.BreakEffect()
			Duel.GetControl(tc,tp,PHASE_END,1)
		end
	end
end