Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Ritual Summon this card with a "Megalith" card. You can discard this card; Ritual Summon 1 "Megalith" Ritual Monster from your hand, by Tributing monsters from your hand or field whose total Levels equal or exceed its Level. If this card is Ritual Summoned: You can target cards your opponent controls, up to the number of Ritual Monsters with different names in your GY; destroy them. You can only use each effect of "Megalith Bethor" once per turn.
--メガリス・ベトール
--Megalith Bethor
--Scripted by AlphaKretin
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	local ritual_target_params={handler=c,lvtype=RITPROC_GREATER,filter=function(ritual_c) return ritual_c:IsSetCard(SET_MEGALITH) and ritual_c~=c end,forcedselection=s.forcedselection}
	local ritual_operation_params={handler=c,lvtype=RITPROC_GREATER,filter=function(ritual_c) return ritual_c:IsSetCard(SET_MEGALITH) end}
	--Ritual Summon 1 "Megalith" Ritual Monster from your hand, by Tributing monsters from your hand or field whose total Levels equal or exceed its Level
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_RELEASE+CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCost(Cost.SelfDiscard)
	e1:SetTarget(Ritual.Target(ritual_target_params))
	e1:SetOperation(Ritual.Operation(ritual_operation_params))
	c:RegisterEffect(e1)
	--Destroy cards your opponent controls, up to the number of Ritual Monsters with different names in your GY
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(function(e) return e:GetHandler():IsRitualSummoned() end)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_MEGALITH}
function s.forcedselection(e,tp,g,sc)
	local c=e:GetHandler()
	return not g:IsContains(c),g:IsContains(c)
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsOnField() end
	local ct=Duel.GetMatchingGroup(Card.IsRitualMonster,tp,LOCATION_GRAVE,0,nil):GetClassCount(Card.GetCode)
	if chk==0 then return ct>0 and Duel.IsExistingTarget(nil,tp,0,LOCATION_ONFIELD,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,nil,tp,0,LOCATION_ONFIELD,1,ct,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,tp,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tg=Duel.GetTargetCards(e)
	if #tg>0 then
		Duel.Destroy(tg,REASON_EFFECT)
	end
end