Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card is Summoned: Take 1000 damage, then change this card to Defense Position. During the End Phase, if you did not take effect damage this turn: You can either add to your hand or Special Summon 1 Rock monster with 0 ATK from your Deck. You can only use this effect of "Crystal Skull" once per turn.
--水晶ドクロ
--Crystal Skull
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Take 1000 damage
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DAMAGE+CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_SUMMON_SUCCESS)
	e1:SetTarget(s.damtg)
	e1:SetOperation(s.damop)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e2)
	local e3=e1:Clone()
	e3:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
	c:RegisterEffect(e3)
	--Add to hand or Special Summon 1 Rock monster
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_PHASE+PHASE_END)
	e4:SetRange(LOCATION_MZONE)
	e4:SetCountLimit(1,id)
	e4:SetCondition(s.thcon)
	e4:SetTarget(s.thtg)
	e4:SetOperation(s.thop)
	c:RegisterEffect(e4)
	--Register damage events
	aux.GlobalCheck(s,function()
		local ge1=Effect.CreateEffect(c)
		ge1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_DAMAGE)
		ge1:SetOperation(s.checkop)
		Duel.RegisterEffect(ge1,0)
	end)
end
function s.checkop(e,tp,eg,ep,ev,re,r,rp)
	if r&REASON_EFFECT==REASON_EFFECT then
		Duel.RegisterFlagEffect(ep,id,RESET_PHASE|PHASE_END,0,1)
	end
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,0,0,tp,1000)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,e:GetHandler(),1,0,0)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.Damage(tp,1000,REASON_EFFECT)<=0 then return end
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsAttackPos() then
		Duel.BreakEffect()
		Duel.ChangePosition(c,POS_FACEUP_DEFENSE)
	end
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFlagEffect(tp,id)==0
end
function s.thfilter(c,ft,e,tp)
	return c:IsRace(RACE_ROCK) and c:IsAttack(0)
		and (c:IsAbleToHand() or (ft>0 and c:IsCanBeSpecialSummoned(e,0,tp,false,false)))
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
		return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil,ft,e,tp)
	end
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local sc=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil,ft,e,tp):GetFirst()
	if not sc then return end
	aux.ToHandOrElse(sc,tp,
		function(sc)
			return ft>0 and sc:IsCanBeSpecialSummoned(e,0,tp,false,false)
		end,
		function(sc)
			return Duel.SpecialSummon(sc,0,tp,tp,false,false,POS_FACEUP)
		end,
		aux.Stringid(id,2))
end