Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card gains effects based on the number of "Harpie" monsters you control, except "Harpie's Pet Baby Dragon". ● 1 or more: Your opponent cannot target "Harpie" monsters you control for attacks, except "Harpie's Pet Baby Dragon". ● 2 or more: Double the original ATK and DEF of this card. ● 3 or more: Once per turn: You can target 1 card your opponent controls; destroy that target.
--ハーピィズペット仔竜
--Harpie's Pet Baby Dragon
local s,id=GetID()
function s.initial_effect(c)
	--at limit
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_SELECT_BATTLE_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(0,LOCATION_MZONE)
	e1:SetValue(s.atlimit)
	c:RegisterEffect(e1)
	--atk/def
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EFFECT_SET_BASE_ATTACK)
	e2:SetCondition(s.adcon)
	e2:SetValue(s.atkval)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_SET_BASE_DEFENSE)
	e3:SetValue(s.defval)
	c:RegisterEffect(e3)
	--destroy
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_DESTROY)
	e4:SetType(EFFECT_TYPE_IGNITION)
	e4:SetRange(LOCATION_MZONE)
	e4:SetCountLimit(1)
	e4:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e4:SetCondition(s.descon)
	e4:SetTarget(s.destg)
	e4:SetOperation(s.desop)
	c:RegisterEffect(e4)
end
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_HARPIE) and c:GetCode()~=id
end
function s.atlimit(e,c)
	return c:IsFaceup() and c:IsSetCard(SET_HARPIE) and c:GetCode()~=id
end
function s.adcon(e)
	return Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_MZONE,0,2,nil)
end
function s.atkval(e,c)
	return c:GetBaseAttack()*2
end
function s.defval(e,c)
	return c:GetBaseDefense()*2
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_MZONE,0,3,nil)
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsOnField() and chkc:IsControler(1-tp) end
	if chk==0 then return Duel.IsExistingTarget(aux.TRUE,tp,0,LOCATION_ONFIELD,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,aux.TRUE,tp,0,LOCATION_ONFIELD,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end