# frozen_string_literal: true
require 'fancy_searchable/searchable'
require 'booru/config'

# == Schema Information
#
# Table name: galleries
#
#  id                 :integer          not null, primary key
#  description        :string           default(""), not null
#  image_count        :integer          default(0), not null
#  order_position_asc :boolean          default(FALSE), not null
#  spoiler_warning    :string           default(""), not null
#  title              :string           not null
#  watcher_count      :integer          default(0), not null
#  created_at         :datetime         not null
#  updated_at         :datetime         not null
#  creator_id         :integer          not null
#  thumbnail_id       :integer          not null
#
# Indexes
#
#  index_galleries_on_creator_id    (creator_id)
#  index_galleries_on_thumbnail_id  (thumbnail_id)
#
# Foreign Keys
#
#  fk_rails_...  (creator_id => users.id) ON DELETE => cascade ON UPDATE => cascade
#
class Gallery < ApplicationRecord
  include FancySearchable::Searchable
  include Indexable
  include Reportable
  resourcify

  belongs_to :creator, class_name: 'User', optional: true
  belongs_to :thumbnail, class_name: 'Post'

  has_many :gallery_interactions
  has_many :posts, through: :gallery_interactions
  has_many :subscriptions, dependent: :delete_all
  has_many :subscribers, through: :subscriptions, source: :user

  validates :title, presence: true
  validates :spoiler_warning, length: { maximum: 20 }
  validates :description, length: { maximum: Booru::CONFIG.settings[:max_comment_length] }
  validate :thumbnail_id_is_an_image, if: ->(g) { g.thumbnail_id.present? }

  after_save :update_index

  before_destroy :removal_clean_up

  def after_subscription_change
    update_index
  end

  def position_order
    order_position_asc ? :asc : :desc
  end

  def add(post)
    gallery_interactions.create(post: post, position: last_position + 1)
    reindex post
    update_index
    Notification.async_notify(self, 'added posts to')
    self
  end

  def remove(post)
    gallery_interactions.find_by(post: post).destroy
    reindex post
    update_index
    self
  end

  private

  def removal_clean_up
    to_reindex = posts.map(&:id)
    gallery_interactions.destroy_all
    BulkIndexUpdateJob.perform_later('Post', to_reindex)
  end

  def reindex(post)
    post.update_index
  end

  def last_position
    gallery_interactions&.maximum(:position) || -1
  end

  def thumbnail_id_is_an_image
    errors[:base] << 'Thumbnail ID must be a valid image Post ID' unless Post.find_by_id(thumbnail_id)&.media_type == 'image'
  end
end