--ボム・ガード
--Guard Mines
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_NEGATE+CATEGORY_DESTROY+CATEGORY_DAMAGE)
	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DAMAGE_CAL)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_CHAINING)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	if not (re:IsHasType(EFFECT_TYPE_ACTIVATE) or re:IsMonsterEffect()) or
		not Duel.IsChainNegatable(ev) then return false end
	local g=Duel.GetChainInfo(ev,CHAININFO_TARGET_CARDS)
	if not g or #g~=1 then return false end
	local gc=g:GetFirst()
	if not gc:IsControler(tp) or not gc:IsLocation(LOCATION_MZONE) then return false end
	local ex,tg,tc=Duel.GetOperationInfo(ev,CATEGORY_DESTROY)
	return ex and tg~=nil and #tg==1 and tg:GetFirst()==gc
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_NEGATE,eg,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,500)
	if re:GetHandler():IsDestructable() and re:GetHandler():IsRelateToEffect(re) then
		Duel.SetOperationInfo(0,CATEGORY_DESTROY,eg,1,0,0)
	end
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if Duel.NegateActivation(ev) and re:GetHandler():IsRelateToEffect(re)
		and Duel.Destroy(eg,REASON_EFFECT)>0 then
		Duel.BreakEffect()
		Duel.Damage(1-tp,500,REASON_EFFECT)
	end
end