Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card attacks, it is changed to Defense Position at the end of the Battle Phase. Once per turn: You can target 1 face-up Defense Position monster your opponent controls; discard 1 card, and if you do, equip that opponent's monster to this card (max. 1). This card gains ATK equal to that equipped monster's. Once per turn, during the End Phase: Special Summon that equipped monster to your opponent's field in Defense Position. * The above text is unofficial and describes the card's functionality in the OCG.
--トランスフォーム・スフィア
--Transforming Sphere
local s,id=GetID()
function s.initial_effect(c)
	--equip
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_HANDES+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)
	--to defense
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_PHASE|PHASE_BATTLE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(s.poscon)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
	--spsummon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_PHASE+PHASE_END)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetCondition(s.spcon)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
end
function s.eqval(ec,c,tp)
	return ec:IsControler(1-tp) and ec:IsPosition(POS_FACEUP_DEFENSE)
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:IsPosition(POS_FACEUP_DEFENSE) and c:IsAbleToChangeControler()
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(1-tp) and s.filter(chkc) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_SZONE)>0 and Duel.GetFieldGroup(tp,LOCATION_HAND,0)~=0
		and Duel.IsExistingTarget(s.filter,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	local g=Duel.SelectTarget(tp,s.filter,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,g,1,0,0)
end
function s.equipop(c,e,tp,tc)
	local atk=tc:GetTextAttack()
	if atk<0 then atk=0 end
	if not c:EquipByEffectAndLimitRegister(e,tp,tc,id) then return end
	if atk>0 then
		local e2=Effect.CreateEffect(c)
		e2:SetType(EFFECT_TYPE_EQUIP)
		e2:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE+EFFECT_FLAG_OWNER_RELATE+EFFECT_FLAG_SET_AVAILABLE)
		e2:SetCode(EFFECT_UPDATE_ATTACK)
		e2:SetReset(RESET_EVENT|RESETS_STANDARD)
		e2:SetValue(atk)
		tc:RegisterEffect(e2)
	end
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if Duel.GetFieldGroup(tp,LOCATION_HAND,0)==0 then return end
	Duel.DiscardHand(tp,nil,1,1,REASON_EFFECT|REASON_DISCARD)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		s.equipop(c,e,tp,tc)
	end
end
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetAttackedCount()>0
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsAttackPos() then
		Duel.ChangePosition(c,POS_FACEUP_DEFENSE)
	end
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	local g=e:GetHandler():GetEquipGroup():Filter(s.eqfilter,nil)
	return #g==1
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local tc=e:GetHandler():GetEquipGroup():Filter(s.eqfilter,nil):GetFirst()
	Duel.SetTargetCard(tc)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,tc,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and Duel.IsPlayerCanSpecialSummon(tp) then
		if Duel.SpecialSummon(tc,0,tp,1-tp,false,false,POS_FACEUP_DEFENSE)==0 then
			Duel.SendtoGrave(tc,REASON_EFFECT)
		end
	end
end