class Setting < ApplicationRecord
  THEMES = ['system', 'light', 'dark'].freeze
  DISPLAY_DENSITIES = ['comfortable', 'compact'].freeze
  FONT_SIZES = ['small', 'normal', 'large'].freeze
  POST_LIST_LIMITS = [20, 50, 100].freeze
  POST_LIST_ORDERS = [
    'title_asc',
    'title_desc',
    'url_asc',
    'url_desc',
    'original_created_at_asc',
    'original_created_at_desc',
    'created_at_asc',
    'created_at_desc',
    'updated_at_asc',
    'updated_at_desc',
  ].freeze
  VIEWED_POST_DISPLAYS = ['show', 'dim', 'hide'].freeze
  AUTO_FETCH_MODES = ['auto', 'manual', 'off'].freeze
  WIKI_EDITOR_MODES = ['split', 'write', 'preview'].freeze

  STRING_ATTRIBUTES = [
    'theme',
    'display_density',
    'font_size',
    'post_list_order',
    'viewed_post_display',
    'auto_fetch_title',
    'auto_fetch_thumbnail',
    'wiki_editor_mode',
  ].freeze
  INTEGER_ATTRIBUTES = ['post_list_limit'].freeze
  BOOLEAN_ATTRIBUTES = ['tag_autocomplete_nico'].freeze
  EDITABLE_ATTRIBUTES =
      (STRING_ATTRIBUTES + INTEGER_ATTRIBUTES + BOOLEAN_ATTRIBUTES).freeze
  TYPE_BY_ATTRIBUTE = {
    'theme' => :string,
    'display_density' => :string,
    'font_size' => :string,
    'post_list_limit' => :integer,
    'post_list_order' => :string,
    'viewed_post_display' => :string,
    'tag_autocomplete_nico' => :boolean,
    'auto_fetch_title' => :string,
    'auto_fetch_thumbnail' => :string,
    'wiki_editor_mode' => :string,
  }.freeze

  belongs_to :user

  validates :user_id, presence: true
  validates :user_id, uniqueness: true

  validates :theme, inclusion: { in: THEMES }
  validates :display_density, inclusion: { in: DISPLAY_DENSITIES }
  validates :font_size, inclusion: { in: FONT_SIZES }
  validates :post_list_limit, inclusion: { in: POST_LIST_LIMITS }
  validates :post_list_order, inclusion: { in: POST_LIST_ORDERS }
  validates :viewed_post_display, inclusion: { in: VIEWED_POST_DISPLAYS }
  validates :tag_autocomplete_nico, inclusion: { in: [true, false] }
  validates :auto_fetch_title, inclusion: { in: AUTO_FETCH_MODES }
  validates :auto_fetch_thumbnail, inclusion: { in: AUTO_FETCH_MODES }
  validates :wiki_editor_mode, inclusion: { in: WIKI_EDITOR_MODES }

  def self.defaults
    {
      theme: 'system',
      display_density: 'comfortable',
      font_size: 'normal',
      post_list_limit: 50,
      post_list_order: 'created_at_desc',
      viewed_post_display: 'show',
      tag_autocomplete_nico: true,
      auto_fetch_title: 'manual',
      auto_fetch_thumbnail: 'manual',
      wiki_editor_mode: 'split',
    }
  end

  def self.serializable_attributes
    EDITABLE_ATTRIBUTES.map(&:to_sym)
  end

  def serializable_hash(options = nil)
    super({ only: self.class.serializable_attributes }.merge(options || { }))
  end
end