Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 "Melodious Maestra" monster + 1 "Melodious" monster Cannot be destroyed by battle or card effects, also you take no battle damage from attacks involving this card. If this card battles a Special Summoned monster, after damage calculation: You can inflict damage to your opponent equal to the difference between the original ATK of that opponent's monster and this card, and if you do, destroy that opponent's monster.
--幻奏の華歌聖ブルーム・ディーヴァ
--Bloom Diva the Melodious Choir
local s,id=GetID()
function s.initial_effect(c)
	--fusion material
	c:EnableReviveLimit()
	Fusion.AddProcMix(c,true,true,aux.FilterBoolFunctionEx(Card.IsSetCard,SET_MELODIOUS_MAESTRA),aux.FilterBoolFunctionEx(Card.IsSetCard,SET_MELODIOUS))
	--indes
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	c:RegisterEffect(e2)
	--avoid battle damage
	local e3=e1:Clone()
	e3:SetCode(EFFECT_AVOID_BATTLE_DAMAGE)
	c:RegisterEffect(e3)
	--destroy
	local e4=Effect.CreateEffect(c)
	e4:SetCategory(CATEGORY_DESTROY+CATEGORY_DAMAGE)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_BATTLED)
	e4:SetCondition(s.condition)
	e4:SetTarget(s.target)
	e4:SetOperation(s.operation)
	c:RegisterEffect(e4)
end
s.listed_series={SET_MELODIOUS_MAESTRA,SET_MELODIOUS}
s.material_setcode={SET_MELODIOUS,SET_MELODIOUS_MAESTRA}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return bc and (bc:GetSummonType()&SUMMON_TYPE_SPECIAL)==SUMMON_TYPE_SPECIAL and c:GetBaseAttack()~=bc:GetBaseAttack()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local bc=e:GetHandler():GetBattleTarget()
	if chk==0 then return bc:IsRelateToBattle() end
	local atk=math.abs(e:GetHandler():GetBaseAttack()-bc:GetBaseAttack())
	Duel.SetTargetCard(bc)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,atk)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,bc,1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local bc=Duel.GetFirstTarget()
	if not bc then return false end
	local atk=math.abs(e:GetHandler():GetBaseAttack()-bc:GetBaseAttack())
	if bc:IsRelateToEffect(e) and bc:IsFaceup() and Duel.Damage(1-tp,atk,REASON_EFFECT)~=0 then
		Duel.Destroy(bc,REASON_EFFECT)
	end
end