Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card destroys an opponent's monster by battle: You can banish 1 DARK monster from your Graveyard; draw 1 card. This card gains 100 ATK for each DARK monster in your Graveyard.
--ダーク・パーシアス
--Darknight Parshath
local s,id=GetID()
function s.initial_effect(c)
	--atk
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(s.atkval)
	c:RegisterEffect(e1)
	--draw
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetCode(EVENT_BATTLE_DESTROYING)
	e2:SetCondition(s.drcon)
	e2:SetCost(s.drcost)
	e2:SetTarget(s.drtg)
	e2:SetOperation(s.drop)
	c:RegisterEffect(e2)
end
function s.atkval(e,c)
	return Duel.GetMatchingGroupCount(Card.IsAttribute,c:GetControler(),LOCATION_GRAVE,0,nil,ATTRIBUTE_DARK)*100
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsRelateToBattle() and c:GetBattleTarget():IsMonster()
end
function s.rfilter(c)
	return c:IsAttribute(ATTRIBUTE_DARK) and c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c,true)
end
function s.drcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.rfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,s.rfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,1,nil)
	Duel.Remove(g,POS_FACEUP,REASON_COST)
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDraw(tp,1) end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end