--スタッド・ヘッジペッグ
--Stud Hedgepeg
--scripted by YoshiDuels
local s,id=GetID()
function s.initial_effect(c)
	--ATK increase
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DECKDES+CATEGORY_ATKCHANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetCountLimit(1)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDiscardDeck(tp,1) end
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DECKDES,nil,0,tp,1)
	Duel.SetPossibleOperationInfo(0,CATEGORY_ATKCHANGE,nil,0,1-tp,-500)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	Duel.DiscardDeck(tp,1,REASON_EFFECT)
	local g=Duel.GetOperatedGroup()
	local ct=g:GetFirst()
	--If it was a monster, reduce ATK
	if ct and ct:IsMonster() and ct:IsLocation(LOCATION_GRAVE) and Duel.IsExistingMatchingCard(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil)
		and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
		local dg=Duel.SelectMatchingCard(tp,aux.FilterMaximumSideFunctionEx(Card.IsFaceup),tp,0,LOCATION_MZONE,1,1,nil)
		if #dg>0 then
			Duel.HintSelection(dg)
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_UPDATE_ATTACK)
			e1:SetValue(-500)
			e1:SetReset(RESETS_STANDARD_PHASE_END)
			dg:GetFirst():RegisterEffect(e1)
		end
	end
end

