Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 "Shaddoll" monster you control; send 1 "Shaddoll" card from your hand to the GY, and if you do, the targeted monster gains 1000 ATK/DEF, but is changed to face-down Defense Position during the End Phase.
--魂源への影劫回帰
--Purushaddoll Aeon
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_TOGRAVE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_SHADDOLL}
function s.filter(c)
	return c:IsSetCard(SET_SHADDOLL) and c:IsFaceup()
end
function s.tgfilter(c)
	return c:IsSetCard(SET_SHADDOLL) and c:IsAbleToGrave()
end
function s.target(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) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil)
		and Duel.IsExistingMatchingCard(s.tgfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,tp,LOCATION_HAND)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.tgfilter,tp,LOCATION_HAND,0,1,1,nil)
	if #g>0 and Duel.SendtoGrave(g,REASON_EFFECT)>0 and g:IsExists(Card.IsLocation,1,nil,LOCATION_GRAVE) then
		local tc=Duel.GetFirstTarget()
		if tc:IsRelateToEffect(e) and tc:IsFaceup() then
			local e1=Effect.CreateEffect(c)
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_UPDATE_ATTACK)
			e1:SetReset(RESET_EVENT|RESETS_STANDARD)
			e1:SetValue(1000)
			tc:RegisterEffect(e1)
			local e2=e1:Clone()
			e2:SetCode(EFFECT_UPDATE_DEFENSE)
			tc:RegisterEffect(e2)
			local fid=c:GetFieldID()
			tc:RegisterFlagEffect(id,RESET_EVENT|RESETS_STANDARD,0,1,fid)
			local e3=Effect.CreateEffect(c)
			e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
			e3:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
			e3:SetCode(EVENT_PHASE+PHASE_END)
			e3:SetCountLimit(1)
			e3:SetLabel(fid)
			e3:SetLabelObject(tc)
			e3:SetCondition(s.flipcon)
			e3:SetOperation(s.flipop)
			Duel.RegisterEffect(e3,tp)
		end
	end
end
function s.flipcon(e,tp,eg,ep,ev,re,r,rp)
	if e:GetLabelObject():GetFlagEffectLabel(id)~=e:GetLabel() then
		e:Reset()
		return false
	else return true end
end
function s.flipop(e,tp,eg,ep,ev,re,r,rp)
	Duel.ChangePosition(e:GetLabelObject(),POS_FACEDOWN_DEFENSE)
end