Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn: You can target 1 face-up Level 3 or lower monster you control; equip that target to this card. (You can only equip 1 monster at a time to this card with this effect.) While equipped with a monster by this effect, this card gains 800 ATK. If this card would be destroyed, you can destroy the monster equipped to it with this effect, instead.
--シー・アーチャー
--Mermaid Archer
local s,id=GetID()
function s.initial_effect(c)
	--equip
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_EQUIP)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCondition(s.eqcon)
	e1:SetTarget(s.eqtg)
	e1:SetOperation(s.eqop)
	c:RegisterEffect(e1)
	aux.AddEREquipLimit(c,s.eqcon,s.eqval,s.equipop,e1)
	--Destroy replace
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EFFECT_DESTROY_REPLACE)
	e2:SetTarget(s.desreptg)
	e2:SetOperation(s.desrepop)
	c:RegisterEffect(e2)
end
function s.eqval(ec,c,tp)
	return ec:IsControler(tp) and ec:IsLevelBelow(3)
end
function s.eqcon(e,tp,eg,ep,ev,re,r,rp)
	local g=e:GetHandler():GetEquipGroup():Filter(s.eqfilter,nil)
	return #g==0
end
function s.eqfilter(c)
	return c:GetFlagEffect(id)~=0 
end
function s.filter(c)
	return c:IsFaceup() and c:IsLevelBelow(3)
end
function s.eqtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) and chkc~=e:GetHandler() end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_SZONE)>0
		and Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,e:GetHandler())
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,g,1,0,0)
end
function s.equipop(c,e,tp,tc)
	if not c:EquipByEffectAndLimitRegister(e,tp,tc,id) then return end
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_EQUIP)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetReset(RESET_EVENT|RESETS_STANDARD)
	e2:SetValue(800)
	tc:RegisterEffect(e2)
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsFaceup() and tc:IsRelateToEffect(e) and tc:IsMonster() then
		s.equipop(c,e,tp,tc)
	end
end
function s.desreptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	local ec=c:GetEquipGroup():Filter(s.eqfilter,nil):GetFirst()
	if chk==0 then return ec and ec:IsHasCardTarget(c) and ec:IsDestructable(e) and not ec:IsStatus(STATUS_DESTROY_CONFIRMED) 
		and not c:IsReason(REASON_REPLACE) end
	return Duel.SelectEffectYesNo(tp,c,96)
end
function s.desrepop(e,tp,eg,ep,ev,re,r,rp)
	local ec=e:GetHandler():GetEquipGroup():Filter(s.eqfilter,nil):GetFirst()
	Duel.Destroy(ec,REASON_EFFECT|REASON_REPLACE)
end