--created by Jake, coded by Keddy, updated by Lyris
--Steinitz's Castling
local s,id,o=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:HOPT(true)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_PHASE+PHASE_END)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCategory(CATEGORY_TODECK)
	e2:SetTarget(s.tdtg)
	e2:SetOperation(s.tdop)
	c:RegisterEffect(e2)
end
function s.colfilter(c,tp)
	return (c:IsType(TYPE_MONSTER) or c:IsLocation(LOCATION_MZONE)) and c:IsControler(1-tp)
end
function s.cfilter(c,e)
	return c:IsFaceup() and c:IsSetCard(0x63d0) and c:GetSequence()<5 and c:IsCanBeEffectTarget(e)
end
function s.gchk(g,tp)
	return g:IsExists(s.cfilter2,1,nil,tp)
end
function s.cfilter2(c,tp)
	return c:GetColumnGroup():FilterCount(s.colfilter,nil,tp)==0
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local g=Duel.GetMatchingGroup(s.cfilter,tp,LOCATION_MZONE,0,nil,e)
	if chk==0 then return g:CheckSubGroup(s.gchk,2,2,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_CONTROL)
	Duel.SetTargetCard(g:SelectSubGroup(tp,s.gchk,false,2,2,tp))
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetTargetsRelateToChain()
	local tc1=g:GetFirst()
	local tc2=g:GetNext()
	if not (tc1 and tc2) then return end
	local c=e:GetHandler()
	local seq1=tc1:GetSequence()
	local seq2=tc2:GetSequence()
	Duel.SwapSequence(tc1,tc2)
	for _,tc in ipairs{tc1,tc2} do
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_IMMUNE_EFFECT)
		e1:SetOwnerPlayer(tp)
		e1:SetReset(RESET_EVENT+RESETS_STANDARD)
		e1:SetValue(s.efilter)
		tc:RegisterEffect(e1)
		local e2=Effect.CreateEffect(c)
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
		e2:SetReset(RESET_EVENT+RESETS_STANDARD+RESET_PHASE+PHASE_END)
		e2:SetValue(1)
		tc:RegisterEffect(e2)
	end
end
function s.efilter(e,re)
	return e:GetOwnerPlayer()~=re:GetOwnerPlayer()
end
function s.tdtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsAbleToDeck() and Duel.GetFlagEffect(tp,id)<1 end
	Duel.SetOperationInfo(0,CATEGORY_TODECK,c,1,0,0)
end
function s.tdop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToChain() or Duel.SendtoDeck(c,nil,SEQ_DECKSHUFFLE,REASON_EFFECT)<1
		or not c:IsLocation(LOCATION_DECK) then return end
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CANNOT_TO_HAND)
	e1:SetTargetRange(LOCATION_MZONE,0)
	e1:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,0x63d0))
	e1:SetReset(RESET_PHASE+PHASE_END)
	Duel.RegisterEffect(e1,tp)
	Duel.RegisterFlagEffect(tp,id,RESET_PHASE+PHASE_END,0,1)
end