Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When there are 3 face-up "7" cards on your side of the field, draw 3 cards from your Deck. Then destroy all "7" cards. When this card is sent directly from the field to your Graveyard, increase your Life Points by 700 points.
--７
--7
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
	--draw
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DRAW+CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_CUSTOM+id)
	e2:SetTarget(s.drtg)
	e2:SetOperation(s.drop)
	c:RegisterEffect(e2)
	--recover
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_RECOVER)
	e3:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetCondition(s.reccon)
	e3:SetTarget(s.rectg)
	e3:SetOperation(s.recop)
	c:RegisterEffect(e3)
end
s.listed_names={id}
function s.filter(c)
	return c:IsFaceup() and c:IsCode(id)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	if Duel.GetMatchingGroupCount(s.filter,tp,LOCATION_SZONE,0,nil)==3 then
		Duel.RaiseSingleEvent(e:GetHandler(),EVENT_CUSTOM+id,e,0,0,0,0)
	end
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,3)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	if Duel.GetMatchingGroupCount(s.filter,tp,LOCATION_SZONE,0,nil)==3 then
		Duel.Draw(tp,3,REASON_EFFECT)
	end
	Duel.BreakEffect()
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.Destroy(g,REASON_EFFECT)
end
function s.reccon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsPreviousLocation(LOCATION_ONFIELD)
end
function s.rectg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(700)
	Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,0,tp,700)
end
function s.recop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Recover(p,d,REASON_EFFECT)
end