Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Change all face-up monsters on the field to face-down Defense Position. During the End Phase of this turn, change as many face-down Defense Position monsters your opponent controls as possible to face-up Defense Position, then your opponent draws cards equal to the number of monsters changed face-up by this effect.
--皆既日蝕の書
--Book of Eclipse
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_POSITION+CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER_E)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsCanTurnSet,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsCanTurnSet,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if #g>0 then
		Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)
	end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e1:SetCode(EVENT_PHASE+PHASE_END)
	e1:SetCountLimit(1)
	e1:SetReset(RESET_PHASE|PHASE_END)
	e1:SetCondition(s.flipcon)
	e1:SetOperation(s.flipop)
	Duel.RegisterEffect(e1,tp)
end
function s.flipcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(Card.IsFacedown,tp,0,LOCATION_MZONE,1,nil)
end
function s.flipop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsFacedown,tp,0,LOCATION_MZONE,nil)
	local ct=Duel.ChangePosition(g,POS_FACEUP_DEFENSE)
	Duel.Draw(1-tp,ct,REASON_EFFECT)
end