Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card is sent from the Spell & Trap Zone to the GY: You can target 1 monster on the field; destroy it. You cannot activate the following effects of "True Draco Apocalypse" in the same Chain. ● You can target 1 other "True Draco" or "True King" card you control; destroy it, and if you do, the ATK/DEF of all face-up monsters your opponent controls become half their current ATK/DEF (even if this card leaves the field). ● During your opponent's Main Phase, you can: Immediately after this effect resolves, Tribute Summon 1 "True Draco" or "True King" monster face-up. You can only use each effect of "True Draco Apocalypse" once per turn.
--真竜の黙示録
--True Draco Apocalypse
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_ACTIVATE)
	e0:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e0)
	--Destroy and halve ATK/DEF
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY+CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE)
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetRange(LOCATION_SZONE)
	e1:SetHintTiming(TIMING_DAMAGE_STEP,TIMING_DAMAGE_STEP|TIMING_END_PHASE)
	e1:SetCountLimit(1,{id,0})
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetCost(s.opccost)
	e1:SetTarget(s.atktg)
	e1:SetOperation(s.atkop)
	c:RegisterEffect(e1)
	--Tribute Summon 1 "True Draco" or "True King" monster face-up
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_SUMMON)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_SZONE)
	e2:SetHintTiming(0,TIMING_MAIN_END)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(function(_,tp) return Duel.IsTurnPlayer(1-tp) and Duel.IsMainPhase() end)
	e2:SetCost(s.opccost)
	e2:SetTarget(s.sumtg)
	e2:SetOperation(s.sumop)
	c:RegisterEffect(e2)
	--Destroy 1 monster on the field
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,2))
	e3:SetCategory(CATEGORY_DESTROY)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetCountLimit(1,{id,2})
	e3:SetCondition(function(e) return e:GetHandler():IsPreviousLocation(LOCATION_SZONE) end)
	e3:SetTarget(s.destg)
	e3:SetOperation(s.desop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_TRUE_DRACO_KING}
function s.opccost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetFlagEffect(tp,id)==0 end
	Duel.RegisterFlagEffect(tp,id,RESET_CHAIN,0,1)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local c=e:GetHandler()
	if chkc then return chkc:IsOnField() and chkc:IsControler(tp) and chkc~=c and chkc:IsFaceup() and chkc:IsSetCard(SET_TRUE_DRACO_KING) end
	if chk==0 then return Duel.IsExistingTarget(aux.FaceupFilter(Card.IsSetCard,SET_TRUE_DRACO_KING),tp,LOCATION_ONFIELD,0,1,c)
		and Duel.IsExistingMatchingCard(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,aux.FaceupFilter(Card.IsSetCard,SET_TRUE_DRACO_KING),tp,LOCATION_ONFIELD,0,1,1,c)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.Destroy(tc,REASON_EFFECT)>0 then
		local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,0,LOCATION_MZONE,nil)
		local c=e:GetHandler()
		for oc in g:Iter() do
			--Their ATK/DEF becomes half
			local e1=Effect.CreateEffect(c)
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_SET_ATTACK_FINAL)
			e1:SetValue(math.ceil(oc:GetAttack()/2))
			e1:SetReset(RESET_EVENT|RESETS_STANDARD)
			oc:RegisterEffect(e1)
			local e2=e1:Clone()
			e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
			e2:SetValue(math.ceil(oc:GetDefense()/2))
			oc:RegisterEffect(e2)
		end
	end
end
function s.sumfilter(c)
	return c:IsSetCard(SET_TRUE_DRACO_KING) and c:IsSummonable(true,nil,1)
end
function s.sumtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.sumfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_SUMMON,nil,1,tp,LOCATION_HAND)
end
function s.sumop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SUMMON)
	local tc=Duel.SelectMatchingCard(tp,s.sumfilter,tp,LOCATION_HAND,0,1,1,nil):GetFirst()
	if tc then
		Duel.Summon(tp,tc,true,nil,1)
	end
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) end
	if chk==0 then return Duel.IsExistingTarget(nil,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,nil,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end