Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
FLIP: Special Summon 1 "Poisonous Snake Token" (Reptile-Type/EARTH/Level 3/ATK 1200/DEF 1200). When the "Poisonous Snake Token" is destroyed as a result of battle, inflict 500 points of damage to your opponent's Life Points.
--スネークポット
--Cobra Jar
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_FLIP)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
s.listed_names={86801872}
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TOKEN,nil,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)>0 
		and Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,1200,1200,3,RACE_REPTILE,ATTRIBUTE_EARTH) then
		local token=Duel.CreateToken(tp,id+1)
		if Duel.SpecialSummonStep(token,0,tp,tp,false,false,POS_FACEUP) then
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
			e1:SetCode(EVENT_BATTLE_DESTROYED)
			e1:SetLabelObject(token)
			e1:SetCondition(s.damcon)
			e1:SetOperation(s.damop)
			Duel.RegisterEffect(e1,tp)
		end
		Duel.SpecialSummonComplete()
	end
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	local tok=e:GetLabelObject()
	if eg:IsContains(tok) then
		return true
	else
		if not tok:IsLocation(LOCATION_MZONE) then e:Reset() end
		return false
	end
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Damage(1-tp,500,REASON_EFFECT)
end