--急雷の泥沼
--Sudden Thunder Swamp
--scripted by pyrQ
local s,id=GetID()
function s.initial_effect(c)
	--When this card is activated: You can discard 1 card, and if you do, Set 1 Continuous Trap from your Deck or GY, with an effect that Special Summons itself as a monster, except the discarded card
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_HANDES)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--Add 1 card with the same name as 1 of your destroyed cards from your Deck to your hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCode(EVENT_CUSTOM+id)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	local g=Group.CreateGroup()
	g:KeepAlive()
	e2:SetLabelObject(g)
	--Keep track of cards destroyed on your field
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e3:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e3:SetCode(EVENT_DESTROYED)
	e3:SetRange(LOCATION_SZONE)
	e3:SetLabelObject(e2)
	e3:SetOperation(s.regop)
	c:RegisterEffect(e3)
end
function s.setfilter(c)
	return c:IsContinuousTrap() and c:IsTrapMonster() and c:IsSSetable()
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil,REASON_EFFECT)
		and Duel.IsExistingMatchingCard(aux.NecroValleyFilter(s.setfilter),tp,LOCATION_DECK|LOCATION_GRAVE,0,1,nil)
		and Duel.SelectYesNo(tp,aux.Stringid(id,2))
		and Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_DISCARD|REASON_EFFECT)>0 then
		local og=Duel.GetOperatedGroup()
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SET)
		local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.setfilter),tp,LOCATION_DECK|LOCATION_GRAVE,0,1,1,og)
		if #g>0 then
			Duel.SSet(tp,g)
		end
	end
end
function s.tgfilter(c,e,tp)
	return c:IsPreviousControler(tp) and c:IsPreviousLocation(LOCATION_ONFIELD) and c:IsCanBeEffectTarget(e) and c:IsReason(REASON_BATTLE|REASON_EFFECT)
		and Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil,c:GetCode())
end
function s.thfilter(c,code)
	return c:IsCode(code) and c:IsAbleToHand()
end
function s.regop(e,tp,eg,ep,ev,re,r,rp)
	local tg=eg:Filter(s.tgfilter,nil,e,tp)
	if #tg>0 then
		for tc in tg:Iter() do
			tc:RegisterFlagEffect(id,RESET_CHAIN,0,1)
		end
		local g=e:GetLabelObject():GetLabelObject()
		if Duel.GetCurrentChain()==0 then g:Clear() end
		g:Merge(tg)
		g:Remove(function(c) return c:GetFlagEffect(id)==0 end,nil)
		e:GetLabelObject():SetLabelObject(g)
		Duel.RaiseSingleEvent(e:GetHandler(),EVENT_CUSTOM+id,e,0,tp,tp,0)
	end
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local g=e:GetLabelObject():Filter(s.tgfilter,nil,e,tp)
	if chkc then return g:IsContains(chkc) and s.tgfilter(chkc,e,tp) end
	if chk==0 then return #g>0 end
	local tc=nil
	if #g>1 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
		tc=g:Select(tp,1,1,nil):GetFirst()
	else
		tc=g:GetFirst()
	end
	Duel.SetTargetCard(tc)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
		local g=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil,tc:GetCode())
		if #g>0 then
			Duel.SendtoHand(g,nil,REASON_EFFECT)
			Duel.ConfirmCards(1-tp,g)
		end
	end
end