Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card in your possession is destroyed by your opponent's attack or card effect and sent to your Graveyard: Target 1 face-up Spell/Trap Card your opponent controls; destroy that target. If this card attacks, it is changed to Defense Position at the end of the Damage Step.
--パワー・ブレイカー
--Power Breaker
local s,id=GetID()
function s.initial_effect(c)
	--destroy
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_TO_GRAVE)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
	--to defense
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_DAMAGE_STEP_END)
	e2:SetCondition(s.poscon)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsPreviousControler(tp) and c:IsReason(REASON_DESTROY) and rp~=tp
		and (not c:IsReason(REASON_BATTLE) or c==Duel.GetAttackTarget())
end
function s.dfilter(c)
	return c:IsFaceup() and c:IsSpellTrap()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsOnField() and chkc:IsControler(1-tp) and s.dfilter(chkc) end
	if chk==0 then return true end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,s.dfilter,tp,0,LOCATION_ONFIELD,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler()==Duel.GetAttacker() and e:GetHandler():IsRelateToBattle()
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsAttackPos() and c:IsRelateToBattle() then
		Duel.ChangePosition(c,POS_FACEUP_DEFENSE)
	end
end