application_controller.rb

class ApplicationController < ActionController::Base
  # Clumsy rescue from fragments custom not null database errors
  rescue_from ActiveRecord::StatementInvalid, :with => :record_invalid_error
  class PageNotFound < StandardError; end;

  protect_from_forgery with: :exception
  # Required for development
  before_action :set_host_for_local_storage

  helper_method :opengraph

  before_action :load_cms_site
  before_action :load_cms_content

  before_action :set_locale
  before_action :check_for_pdf

  def admin_path?
    request.original_fullpath =~ %r{/(?:#{I18n.locale}/)?admin/?}
  end

  def opengraph
    return if admin_path?

    @opengraph ||= OpengraphBuilder.new('og': og_tags, 'twitter': twitter_tags)
  end

  def og_tags
    {
      'site_name': t('meta.site.name'),
      'title': t('meta.site.title'),
      'description': t('meta.site.description'),
      'url': request.url,
      'type': 'website',
      'image': URI.join(root_url, helpers.image_path(t('meta.image'))),
      'image:alt': t('meta.image_alt'),
      'image:height': t('meta.image_height'),
      'image:width': t('meta.image_width'),
      'locale': 'en_GB'
    }
  end

  def twitter_tags
    {
      'card': t('meta.twitter.card'),
      'site': t('meta.twitter.site'),
      'creator': t('meta.twitter.creator')
    }
  end

  def default_url_options
    { locale: I18n.locale }
  end

  def set_locale
    if params[:locale].present?
      I18n.locale = params[:locale]
    else
      I18n.locale = I18n.default_locale
    end
  end

  def raise_404
    raise PageNotFound
  end

  rescue_from PageNotFound do
    render_404
  end

  rescue_from StandardError do
    render_500
  end

  def enable_caching
    expires_in Rails.application.secrets.cache_max_age, public: true
  end

  def after_sign_in_path_for(resource)
    session[:previous_url] || root_path
  end

  private

  def load_cms_site
    return if admin_path?

    @cms_site ||= Comfy::Cms::Site.first
  end

  def load_cms_content
    return if admin_path?

    # Strips out the locale and any query params (including the query character) 
    # when attempting to find the page in the DB by its full_path
    sanitised_request = request.original_fullpath.gsub(%r{\A/#{I18n.locale}/?}, '/')[/[^?]+/]

    @cms_page ||= Comfy::Cms::Page.find_by_full_path(sanitised_request)

    return unless @cms_page

    ComfyOpengraph.new({ 'social-title': 'title', 'social-description': 'description', 'image': 'image' },
                        page: @cms_page).parse(opengraph: opengraph, type: 'og')
  end

  def record_invalid_error
    message = "We're sorry, but something went wrong"

    fragments_params = params[:page][:fragments_attributes]
    if fragments_params.present? && is_comfy_page_edit?
      null_fragments = []
      # Only get custom not null cms tags
      # Currently only works with dates but it's already more generalised to work with texts
      fragments_params.values.select { |v| v['tag'].include?('not_null') }.map do |fragment|
        if fragment['tag'].include?('date') && fragment['datetime'].blank? ||
            fragment['tag'].include?('text') && fragment['content'].blank?
          null_fragments << fragment['identifier']
        end
      end
      message = "The following fields cannot be empty: #{null_fragments.join(', ')}"
    end

    redirect_to request.referrer, alert: message
  end

  def is_comfy_page_edit?
    params[:controller] == 'comfy/admin/cms/pages' && params[:action] == 'update'
  end

  def render_404
    render file: Rails.root.join("/app/views/layouts/404.html.erb"), layout: true, status: :not_found
  end

  def render_500
    render file: Rails.root.join("/app/views/layouts/500.html.erb"), layout: true, status: :internal_server_error
  end

  def check_for_pdf
    @for_pdf = params[:for_pdf].present?
  end

  def set_host_for_local_storage
    Rails.application.routes.default_url_options[:host] = request.base_url
    # TODO Check why this is not set automatically
    # ActiveStorage::Current.host = request.base_url if Rails.application.config.active_storage.service == :local
  end
end