Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by returning 1 "U.A." monster you control to the hand, except "U.A. Playmaker". You can only Special Summon "U.A. Playmaker" once per turn this way. When another "U.A." monster you control declares an attack: You can have this card lose exactly 800 ATK, and if you do, your attacking monster gains 800 ATK.
--U.A.フィールドゼネラル
--U.A. Playmaker
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--atk
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.atkcon)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_UA}
s.listed_names={id}
function s.spfilter(c,ft)
	return c:IsFaceup() and c:IsSetCard(SET_UA) and not c:IsCode(id) and c:IsAbleToHandAsCost()
		and (ft>0 or c:GetSequence()<5)
end
function s.spcon(e,c)
	if c==nil then return true end
	local tp=e:GetHandlerPlayer()
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	local rg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_MZONE,0,nil,ft)
	return ft>-1 and #rg>0 and aux.SelectUnselectGroup(rg,e,tp,1,1,nil,0)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,c)
	local c=e:GetHandler()
	local g=nil
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	local rg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_MZONE,0,nil,ft)
	local g=aux.SelectUnselectGroup(rg,e,tp,1,1,nil,1,tp,HINTMSG_RTOHAND,nil,nil,true)
	if #g>0 then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.SendtoHand(g,nil,REASON_COST)
	g:DeleteGroup()
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	local at=Duel.GetAttacker()
	return at:IsSetCard(SET_UA) and at:IsControler(tp) and at~=e:GetHandler() and e:GetHandler():IsAttackAbove(800)
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local at=Duel.GetAttacker()
	if c:IsFaceup() and c:IsRelateToEffect(e) and c:IsAttackAbove(800) then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
		e1:SetValue(-800)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		c:RegisterEffect(e1)
		if at:IsFaceup() and at:IsRelateToBattle() then
			local e2=e1:Clone()
			e2:SetValue(800)
			at:RegisterEffect(e2)
		end
	end
end