Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When a Defense Position monster you control is targeted for an attack: Change that Defense Position monster to face-up Attack Position. Then, if the attacking monster is destroyed by that battle and sent to the Graveyard: Inflict damage to your opponent equal to that monster's original ATK in the Graveyard.
--ガムシャラ
--Gamushara
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_BE_BATTLE_TARGET)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local d=Duel.GetAttackTarget()
	if chk==0 then return d:IsDefensePos() and d:IsControler(tp) end
	Duel.SetTargetCard(d)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsDefensePos() then
		Duel.ChangePosition(tc,POS_FACEUP_ATTACK)
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(aux.Stringid(id,0))
		e1:SetCategory(CATEGORY_DAMAGE)
		e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
		e1:SetCode(EVENT_BATTLE_DESTROYED)
		e1:SetCondition(s.damcon)
		e1:SetTarget(s.damtg)
		e1:SetOperation(s.damop)
		e1:SetReset(RESET_PHASE|PHASE_DAMAGE)
		Duel.RegisterEffect(e1,tp)
	end
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetAttacker()
	return eg:IsContains(tc) and tc:IsLocation(LOCATION_GRAVE) and tc:IsReason(REASON_BATTLE)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local atk=Duel.GetAttacker():GetBaseAttack()
	if atk<0 then atk=0 end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(atk)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,atk)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end