--幾星霜
--Ages of Stars and Frost
--scripted by pyrQ
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE)
	e1:SetCondition(function(e,tp) return Duel.HasFlagEffect(tp,id) and not Duel.HasFlagEffect(tp,id+1) end)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--Add this card to your hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY,EFFECT_FLAG2_CHECK_SIMULTANEOUS)
	e2:SetCode(EVENT_TO_DECK)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,id)
	e2:SetCondition(s.thcon)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	--Register if the card's condition is met
	aux.GlobalCheck(s,function()
		local ge1=Effect.CreateEffect(c)
		ge1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_TO_GRAVE)
		ge1:SetOperation(s.checkop)
		Duel.RegisterEffect(ge1,0)
	end)
end
function s.checkop(e,tp,eg,ep,ev,re,r,rp)
	for tc in eg:Iter() do
		local prev_p=tc:GetPreviousControler()
		if tc:IsPreviousLocation(LOCATION_MZONE) and tc:IsReason(REASON_DESTROY) and tc:IsReason(REASON_EFFECT)
			and ((re:IsSpellEffect() and rp==prev_p) or rp==1-prev_p) then
			Duel.RegisterFlagEffect(prev_p,id,RESET_PHASE|PHASE_END,0,1)
		end
	end
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if Duel.HasFlagEffect(tp,id+1) then return end
	Duel.RegisterFlagEffect(tp,id+1,RESET_PHASE|PHASE_END,0,1)
	local turn_ct=Duel.GetTurnCount()
	local ct=Duel.IsTurnPlayer(tp) and Duel.IsBattlePhase() and 2 or 1
	--Can conduct your next Battle Phase twice
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetDescription(aux.Stringid(id,2))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_CLIENT_HINT)
	e1:SetCode(EFFECT_BP_TWICE)
	e1:SetTargetRange(1,0)
	e1:SetValue(1)
	e1:SetCondition(function() return ct==1 or Duel.GetTurnCount()~=turn_ct end)
	e1:SetReset(RESET_PHASE|PHASE_BATTLE|RESET_SELF_TURN,ct)
	Duel.RegisterEffect(e1,tp)
end
function s.cfilter(c,tp)
	return c:IsPreviousControler(tp) and c:IsPreviousLocation(LOCATION_MZONE) and (c:IsLocation(LOCATION_DECK) or c:IsFacedown())
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.cfilter,1,nil,tp)
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsAbleToHand() end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,c,1,tp,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then
		Duel.SendtoHand(c,nil,REASON_EFFECT)
	end
end