movements_filter.rb

class MovementsFilter
  attr_writer :accountancy_movement, :pending_accountancy

  def initialize(params = {})
    @descriptor = params.fetch(:descriptor) { raise ArgumentError, "You must supply a :descriptor param" }
    @month = params[:month] || Date.current.month
    @year = params[:year] || Date.current.year
  end

  def filter()
    period.map do |date|
      {
        date: date,
        movements: movements.fetch(date, 0),
        pendings: pendings.fetch(date, 0)
      }
    end.reject { |item| item[:movements].zero? && item[:pendings].zero? }
  end

  private

  attr_reader :descriptor, :month, :year

  def date
    @date ||= Date.new(year.to_i, month.to_i)
  end

  def period
    @period ||= date.beginning_of_month..date.end_of_month
  end

  def movements
    @accountancy_movements ||= accountancy_movement.with_descriptor(descriptor)
                                                   .by_date(period)
                                                   .count(:group => :date)
  end

  def pendings
    @pending_accountancies ||= pending_accountancy.with_descriptor(descriptor)
                                                  .unprocessed(true)
                                                  .by_date(period)
                                                  .count(:group => :date)
      require 'pry'; binding.pry
  end

  def accountancy_movement
    @accountancy_movement ||= AccountancyMovement
  end

  def pending_accountancy
    @pending_accountancy ||= PendingAccountancy
  end
end