--黒板消しの罠
--Trap of Board Eraser
local s,id=GetID()
function s.initial_effect(c)
	--reflect
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCategory(CATEGORY_HANDES)
	e1:SetCode(EVENT_CHAINING)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	if re:IsSpellTrapEffect() and not re:IsHasType(EFFECT_TYPE_ACTIVATE) then return false end
	local ex,cg,ct,cp,cv=Duel.GetOperationInfo(ev,CATEGORY_DAMAGE)
	if ex then return true end
	ex,cg,ct,cp,cv=Duel.GetOperationInfo(ev,CATEGORY_RECOVER)
	if not ex then return false end
	if cp~=PLAYER_ALL then return Duel.IsPlayerAffectedByEffect(cp,EFFECT_REVERSE_RECOVER)
	else return Duel.IsPlayerAffectedByEffect(0,EFFECT_REVERSE_RECOVER)
		or Duel.IsPlayerAffectedByEffect(1,EFFECT_REVERSE_RECOVER)
	end
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetFieldGroupCount(tp,0,LOCATION_HAND)>0 end
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,1-tp,1)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	Duel.DiscardHand(1-tp,nil,1,1,REASON_EFFECT|REASON_DISCARD)
	local cid=Duel.GetChainInfo(ev,CHAININFO_CHAIN_ID)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CHANGE_DAMAGE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetTargetRange(1,0)
	e1:SetLabel(cid)
	e1:SetValue(s.refcon)
	e1:SetReset(RESET_CHAIN)
	Duel.RegisterEffect(e1,tp)
end
function s.refcon(e,re,val,r,rp,rc)
	local cc=Duel.GetCurrentChain()
	if cc==0 or (r&REASON_EFFECT)==0 then return end
	local cid=Duel.GetChainInfo(0,CHAININFO_CHAIN_ID)
	if cid==e:GetLabel() then return 0
	else return val end
end