Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Level 8 LIGHT Dragon monster + 1 Level 8 DARK Dragon monster Must be Fusion Summoned. While face-up on the field, this card is also DARK-Attribute. Once per Chain, if a Spell/Trap Card, or monster effect, is activated (Quick Effect): This card loses exactly 1000 ATK/DEF, and if it does, negate the activation. If this card in its owner's possession is destroyed by an opponent's card: You can target 1 Dragon monster in your GY; Special Summon it.
--光と闇の竜王
--Light and Darkness Dragonlord
--scripted by pyrQ
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--Fusion Materials
	Fusion.AddProcMix(c,true,true,s.matfilter(ATTRIBUTE_LIGHT),s.matfilter(ATTRIBUTE_DARK))
	c:AddMustBeFusionSummoned()
	--While face-up on the field, this card is also DARK-Attribute
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetCode(EFFECT_ADD_ATTRIBUTE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetValue(ATTRIBUTE_DARK)
	c:RegisterEffect(e1)
	--Make this card lose 1000 ATK/DEF and negate the activation of a Spell/Trap Card, or monster effect
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE+CATEGORY_NEGATE)
	e2:SetType(EFFECT_TYPE_QUICK_F)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DAMAGE_CAL)
	e2:SetCode(EVENT_CHAINING)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,0,EFFECT_COUNT_CODE_CHAIN)
	e2:SetCondition(function(e,tp,eg,ep,ev,re,r,rp) return re:IsHasType(EFFECT_TYPE_ACTIVATE) or re:IsMonsterEffect() end)
	e2:SetTarget(s.negtg)
	e2:SetOperation(s.negop)
	c:RegisterEffect(e2)
	--Special Summon 1 Dragon monster from your GY
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e3:SetCode(EVENT_DESTROYED)
	e3:SetCondition(function(e,tp,eg,ep,ev,re,r,rp) return rp==1-tp and e:GetHandler():IsPreviousControler(tp) end)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
end
function s.matfilter(attribute)
	return function(c,fc,sumtype,tp)
			return c:IsLevel(8) and c:IsAttribute(attribute,fc,sumtype,tp) and c:IsRace(RACE_DRAGON,fc,sumtype,tp)
		end
end
function s.negtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return not c:HasFlagEffect(id) end
	if c:IsHasEffect(EFFECT_REVERSE_UPDATE) then
		c:RegisterFlagEffect(id,RESETS_STANDARD_PHASE_END,0,1)
	end
	Duel.SetOperationInfo(0,CATEGORY_NEGATE,eg,1,tp,0)
end
function s.negop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not (c:IsRelateToEffect(e) and c:IsFaceup() and c:IsAttackAbove(1000) and c:IsDefenseAbove(1000)
		and not c:IsStatus(STATUS_BATTLE_DESTROYED)) then return end
	local prev_atk,prev_def=c:GetAttack(),c:GetDefense()
	--This card loses 1000 ATK/DEF
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_COPY_INHERIT)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(-1000)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD_DISABLE)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e2)
	if c:IsAttack(prev_atk-1000) and c:IsDefense(prev_def-1000) and Duel.GetCurrentChain()==ev+1 then
		Duel.NegateActivation(ev)
	end
end
function s.spfilter(c,e,tp)
	return c:IsRace(RACE_DRAGON) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.spfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,tp,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
	end
end