class Fandom < Tag

  NAME = ArchiveConfig.FANDOM_CATEGORY_NAME

  has_many :wrangling_assignments
  has_many :wranglers, through: :wrangling_assignments, source: :user

  has_many :parents, through: :common_taggings, source: :filterable, source_type: 'Tag', after_remove: :check_media
  has_many :medias,  -> { where(type: 'Media') }, through: :common_taggings, source: :filterable, source_type: 'Tag'
  has_many :characters, -> { where(type: 'Character') }, through: :child_taggings, source: :common_tag
  has_many :relationships, -> { where(type: 'Relationship') }, through: :child_taggings, source: :common_tag
  has_many :freeforms, -> { where(type: 'Freeform') }, through: :child_taggings, source: :common_tag


  scope :by_media, lambda {|media| where(media_id: media.id)}

  def unwrangled?
    Media.uncategorized.fandoms.include?(self)
  end

  # An association callback to add the default media if all others have been removed
  def check_media(media)
    self.add_media_for_uncategorized
  end

  after_save :add_media_for_uncategorized
  def add_media_for_uncategorized
    if self.medias.empty? && self.type == "Fandom" # type could be something else if the tag is in the process of being re-categorised (re-sorted)
      self.parents << Media.uncategorized
    end
  end

  before_update :check_wrangling_status
  def check_wrangling_status
    if self.canonical_changed? && !self.canonical?
      if !self.canonical? && self.merger_id
        self.merger.wranglers = (self.wranglers + self.merger.wranglers).uniq
      end
      self.wranglers = []
    end
  end

  # Types of tags to which a fandom tag can belong via common taggings or meta taggings
  def parent_types
    ['Media', 'MetaTag']
  end
  def child_types
    ['Character', 'Relationship', 'Freeform', 'SubTag', 'Merger']
  end
end