--Dracosis Errantail
local s,id=GetID()
function s.initial_effect(c)
	--negate attack
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_POSITION|CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_SINGLE|EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_BE_BATTLE_TARGET)
	e1:SetCountLimit(1)
	e1:SetCondition(aux.BattlePhaseCond(1))
	e1:SetCost(s.nacost)
	e1:SetTarget(s.natg)
	e1:SetOperation(s.naop)
	c:RegisterEffect(e1)
	--special summon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_SINGLE|EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_DESTROYED)
	e3:SetCondition(s.spcon)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
	local e4=e3:Clone()
	e4:SetCode(EVENT_RELEASE)
	c:RegisterEffect(e4)
end
function s.spfilter(c,e,tp,pos)
	return c:IsSetCard(0x300) and c:IsRace(RACE_DRAGON) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,pos)
end
function s.sfilter(c)
	return c:IsSetCard(0x300) and c:IsMonster() and c:IsAbleToDeck()
end
function s.nacost(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsCanChangePosition() end
	Duel.ChangePosition(c,POS_FACEUP_DEFENSE,POS_FACEDOWN_DEFENSE,POS_FACEUP_ATTACK,POS_FACEUP_ATTACK)
end
function s.natg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,1,nil,e,tp) and Duel.IsExistingMatchingCard(s.sfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TODECK,nil,1,tp,LOCATION_HAND)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,0,tp,LOCATION_DECK)
end
function s.naop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.NegateAttack() then
		if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
		local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp)
		if #g>0 then
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
			local sg=Duel.SelectMatchingCard(tp,s.sfilter,tp,LOCATION_HAND,0,1,1,nil)
			if #sg>0 then
				Duel.ConfirmCards(1-tp,sg)
				if Duel.ShuffleIntoDeck(sg)>0 then
					g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp)
					if #g<=0 then return end
					Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
					local g1=g:Select(tp,1,1,nil)
					if #g1>0 then
						Duel.SpecialSummon(g1,0,tp,tp,false,false,POS_FACEUP)
					end
				end
			end
		end
	end
end

function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsReason(REASON_EFFECT) and rp==1-tp
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,1,nil,e,tp,POS_FACEUP_ATTACK) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_DECK,0,1,1,nil,e,tp,POS_FACEUP_ATTACK)
	if g:GetCount()>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP_ATTACK)
	end
end