module Locomotive
  class Page

    include Locomotive::Mongoid::Document

    MINIMAL_ATTRIBUTES = %w(_id title slug fullpath position depth published templatized target_klass_name redirect listed response_type parent_id parent_ids site_id created_at updated_at)

    ## Extensions ##
    include Extensions::Page::Tree
    include Extensions::Page::EditableElements
    include Extensions::Page::Layout
    include Extensions::Page::Parse
    include Extensions::Page::Render
    include Extensions::Page::Templatized
    include Extensions::Page::Redirect
    include Extensions::Page::Listed
    include Extensions::Shared::Slug
    include Extensions::Shared::Seo

    ## fields ##
    field :title,               localize: true
    field :slug,                localize: true
    field :fullpath,            localize: true
    field :handle
    field :raw_template,        localize: true
    field :locales,             type: Array
    field :published,           type: Boolean, default: false
    field :cache_strategy,      default: 'none'
    field :response_type,       default: 'text/html'

    ## associations ##
    belongs_to :site, class_name: 'Locomotive::Site', validate: false, autosave: false

    ## indexes ##
    index site_id:    1
    index parent_id:  1
    index fullpath:   1, site_id: 1

    ## behaviours ##
    slugify_from        :title

    ## callbacks ##
    after_initialize    :set_default_raw_template
    before_save         :build_fullpath
    before_save         :record_current_locale
    before_destroy      :do_not_remove_index_and_404_pages
    after_save          :update_children

    ## validations ##
    validates_presence_of     :site,    :title, :slug
    validates_uniqueness_of   :slug,    scope: [:site_id, :parent_id], allow_blank: true
    validates_uniqueness_of   :handle,  scope: :site_id, allow_blank: true
    validates_exclusion_of    :slug,    in: Locomotive.config.reserved_slugs, if: Proc.new { |p| p.depth <= 1 }

    ## named scopes ##
    scope :latest_updated,      order_by(updated_at: :desc).limit(Locomotive.config.ui[:latest_entries_nb])
    scope :root,                -> { where(slug: 'index', depth: 0) }
    scope :not_found,           -> { where(slug: '404', depth: 0) }
    scope :published,           where(published: true)
    scope :fullpath,            ->(fullpath){ where(fullpath: fullpath) }
    scope :handle,              ->(handle){ where(handle: handle) }
    scope :minimal_attributes,  ->(attrs = []) { without(self.fields.keys - MINIMAL_ATTRIBUTES) }
    scope :dependent_from,      ->(id) { where(:template_dependencies.in => [id]) }

    ## methods ##

    def index?
      self.slug == 'index' && self.depth.to_i == 0
    end

    def not_found?
      self.slug == '404' && self.depth.to_i == 0
    end

    def unpublished?
      !self.published?
    end

    def index_or_not_found?
      self.index? || self.not_found?
    end

    def with_cache?
      self.cache_strategy != 'none'
    end

    def default_response_type?
      self.response_type == 'text/html'
    end

    def translated?
      self.title_translations.key?(::Mongoid::Fields::I18n.locale.to_s) rescue false
    end

    def translated_in
      self.title_translations.try(:keys)
    end

    protected

    def do_not_remove_index_and_404_pages
      return if self.site.nil? || self.site.destroyed?

      if self.index? || self.not_found?
        self.errors[:base] << ::I18n.t('errors.messages.protected_page')
      end

      self.errors.empty?
    end

    def set_default_raw_template
      self.raw_template ||= ::I18n.t('attributes.defaults.pages.other.body')
    end

    def build_fullpath
      if self.index? || self.not_found?
        self.fullpath = self.slug
      else
        slugs = self.ancestors_and_self.map(&:slug)
        slugs.shift unless slugs.size == 1
        self.fullpath = File.join slugs.compact
      end
    end

    def update_children
      self.children.map(&:save) if self.slug_changed? or self.fullpath_changed?
    end

    def record_current_locale
      self.locales ||= []
      self.locales << ::Mongoid::Fields::I18n.locale
      self.locales.uniq!
    end

  end
end