=begin
  Camaleon CMS is a content management system
  Copyright (C) 2015 by Owen Peredo Diaz
  Email: owenperedo@gmail.com
  This program is free software: you can redistribute it and/or modify   it under the terms of the GNU Affero General Public License as  published by the Free Software Foundation, either version 3 of the  License, or (at your option) any later version.
  This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the  GNU Affero General Public License (GPLv3) for more details.
=end
class CamaleonCms::Category < CamaleonCms::TermTaxonomy
  alias_attribute :site_id, :term_group
  alias_attribute :post_type_id, :status
  default_scope { where(taxonomy: :category) }
  has_many :metas, ->{ where(object_class: 'Category')}, :class_name => "CamaleonCms::Meta", foreign_key: :objectid, dependent: :destroy
  has_many :posts, foreign_key: :objectid, through: :term_relationships, :source => :objects
  has_many :children, class_name: "CamaleonCms::Category", foreign_key: :parent_id, dependent: :destroy
  belongs_to :parent, class_name: "CamaleonCms::Category", foreign_key: :parent_id
  belongs_to :post_type_parent, class_name: "CamaleonCms::PostType", foreign_key: :parent_id, inverse_of: :categories
  belongs_to :site, class_name: 'CamaleonCms::Site', foreign_key: :site_id

  scope :no_empty, ->{ where("count > 0") } # return all categories that contains at least one post
  scope :empty, ->{ where(count: [0,nil]) } # return all categories that does not contain any post

  #scope :parents, -> { where("term_taxonomy.parent_id IS NULL") }

  before_save :set_site
  before_destroy :set_posts_in_default_category

  # return the post type of this category
  def post_type
    cama_fetch_cache("post_type") do
      ctg = self
      begin
        pt = ctg.post_type_parent
        ctg = ctg.parent
      end while ctg.present?
      pt
    end
  end

  private
  def set_site
    pt = self.post_type
    self.site_id = pt.site_id unless self.site_id.present?
    self.status = pt.id unless self.status.present?
  end

  # rescue all posts to assign into default category if they don't have any category assigned
  def set_posts_in_default_category
    category_default = self.post_type.default_category
    return if category_default == self
    self.posts.each do |post|
      if post.categories.where.not(id: self.id).blank?
        post.assign_category(category_default.id)
      end
    end
  end

end