# FacadeパターンはControllerとViewからプレゼンテーションロジックを抽出したPlain Ruby Objectのインターフェイス
# 参考↓
# https://refactoring.guru/ja/design-patterns/facade/ruby/example
# https://blog.appsignal.com/2020/03/18/facade-pattern-in-rails-for-performance-and-maintainability.html

## Facade未使用
class BooksController < ApplicationController
  def index
    @books  = if params[:query].present?
                current_user.books.where('name ILIKE ?', "%#{params[:query]}%")
              elsif params[:isbn].present?
                current_user.books.where(isbn: params[:isbn])
              else
                current_user.books
              end

    @books.order(created_at: :desc).page(params[:page])
    @recommended = @books.where(some_complex_query: true)
  end
end

## Facade使用
class BooksController < ApplicationController
  def index
    @index_facade = Books::IndexFacade.new(user: current_user, params: params)
  end
end