mastodon/app/helpers/application_helper.rb

# frozen_string_literal: true

module ApplicationHelper
  DANGEROUS_SCOPES = %w(
    read
    write
    follow
  ).freeze

  RTL_LOCALES = %i(
    ar
    ckb
    fa
    he
  ).freeze

  def friendly_number_to_human(number, **options)
    # By default, the number of precision digits used by number_to_human
    # is looked up from the locales definition, and rails-i18n comes with
    # values that don't seem to make much sense for many languages, so
    # override these values with a default of 3 digits of precision.
    options = options.merge(
      precision: 3,
      strip_insignificant_zeros: true,
      significant: true
    )

    number_to_human(number, **options)
  end

  def open_registrations?
    Setting.registrations_mode == 'open'
  end

  def approved_registrations?
    Setting.registrations_mode == 'approved'
  end

  def closed_registrations?
    Setting.registrations_mode == 'none'
  end

  def available_sign_up_path
    if closed_registrations? || omniauth_only?
      'https://joinmastodon.org/#getting-started'
    else
      ENV.fetch('SSO_ACCOUNT_SIGN_UP', new_user_registration_path)
    end
  end

  def omniauth_only?
    ENV['OMNIAUTH_ONLY'] == 'true'
  end

  def link_to_login(name = nil, html_options = nil, &block)
    target = new_user_session_path

    html_options = name if block

    if omniauth_only? && Devise.mappings[:user].omniauthable? && User.omniauth_providers.size == 1
      target = omniauth_authorize_path(:user, User.omniauth_providers[0])
      html_options ||= {}
      html_options[:method] = :post
    end

    if block
      link_to(target, html_options, &block)
    else
      link_to(name, target, html_options)
    end
  end

  def provider_sign_in_link(provider)
    label = Devise.omniauth_configs[provider]&.strategy&.display_name.presence || I18n.t("auth.providers.#{provider}", default: provider.to_s.chomp('_oauth2').capitalize)
    link_to label, omniauth_authorize_path(:user, provider), class: "button button-#{provider}", method: :post
  end

  def locale_direction
    if RTL_LOCALES.include?(I18n.locale)
      'rtl'
    else
      'ltr'
    end
  end

  def html_title
    safe_join(
      [content_for(:page_title).to_s.chomp, title]
      .select(&:present?),
      ' - '
    )
  end

  def title
    Rails.env.production? ? site_title : "#{site_title} (Dev)"
  end

  def class_for_scope(scope)
    'scope-danger' if DANGEROUS_SCOPES.include?(scope.to_s)
  end

  def can?(action, record)
    return false if record.nil?

    policy(record).public_send(:"#{action}?")
  end

  def fa_icon(icon, attributes = {})
    class_names = attributes[:class]&.split || []
    class_names << 'fa'
    class_names += icon.split.map { |cl| "fa-#{cl}" }

    content_tag(:i, nil, attributes.merge(class: class_names.join(' ')))
  end

  def check_icon
    inline_svg_tag 'check.svg'
  end

  def visibility_icon(status)
    if status.public_visibility?
      fa_icon('globe', title: I18n.t('statuses.visibilities.public'))
    elsif status.unlisted_visibility?
      fa_icon('unlock', title: I18n.t('statuses.visibilities.unlisted'))
    elsif status.private_visibility? || status.limited_visibility?
      fa_icon('lock', title: I18n.t('statuses.visibilities.private'))
    elsif status.direct_visibility?
      fa_icon('at', title: I18n.t('statuses.visibilities.direct'))
    end
  end

  def interrelationships_icon(relationships, account_id)
    if relationships.following[account_id] && relationships.followed_by[account_id]
      fa_icon('exchange', title: I18n.t('relationships.mutual'), class: 'fa-fw active passive')
    elsif relationships.following[account_id]
      fa_icon(locale_direction == 'ltr' ? 'arrow-right' : 'arrow-left', title: I18n.t('relationships.following'), class: 'fa-fw active')
    elsif relationships.followed_by[account_id]
      fa_icon(locale_direction == 'ltr' ? 'arrow-left' : 'arrow-right', title: I18n.t('relationships.followers'), class: 'fa-fw passive')
    end
  end

  def custom_emoji_tag(custom_emoji)
    if prefers_autoplay?
      image_tag(custom_emoji.image.url, class: 'emojione', alt: ":#{custom_emoji.shortcode}:")
    else
      image_tag(custom_emoji.image.url(:static), :class => 'emojione custom-emoji', :alt => ":#{custom_emoji.shortcode}", 'data-original' => full_asset_url(custom_emoji.image.url), 'data-static' => full_asset_url(custom_emoji.image.url(:static)))
    end
  end

  def opengraph(property, content)
    tag.meta(content: content, property: property)
  end

  def body_classes
    output = body_class_string.split
    output << "theme-#{current_theme.parameterize}"
    output << 'system-font' if current_account&.user&.setting_system_font_ui
    output << (current_account&.user&.setting_reduce_motion ? 'reduce-motion' : 'no-reduce-motion')
    output << 'rtl' if locale_direction == 'rtl'
    output.compact_blank.join(' ')
  end

  def theme_style_tags(theme)
    if theme == 'system'
      concat stylesheet_pack_tag('mastodon-light', media: 'not all and (prefers-color-scheme: dark)', crossorigin: 'anonymous')
      concat stylesheet_pack_tag('default', media: '(prefers-color-scheme: dark)', crossorigin: 'anonymous')
      concat tag.meta name: 'theme-color', content: Themes::MASTODON_DARK_THEME_COLOR, media: '(prefers-color-scheme: dark)'
      concat tag.meta name: 'theme-color', content: Themes::MASTODON_LIGHT_THEME_COLOR, media: '(prefers-color-scheme: light)'
    else
      concat stylesheet_pack_tag theme, media: 'all', crossorigin: 'anonymous'
      concat tag.meta name: 'theme-color', content: theme == 'mastodon-light' ? Themes::MASTODON_LIGHT_THEME_COLOR : Themes::MASTODON_DARK_THEME_COLOR
    end
  end

  def cdn_host
    Rails.configuration.action_controller.asset_host
  end

  def cdn_host?
    cdn_host.present?
  end

  def storage_host
    "https://#{storage_host_var}"
  end

  def storage_host?
    storage_host_var.present?
  end

  def quote_wrap(text, line_width: 80, break_sequence: "\n")
    text = word_wrap(text, line_width: line_width - 2, break_sequence: break_sequence)
    text.split("\n").map { |line| "> #{line}" }.join("\n")
  end

  def render_initial_state
    state_params = {
      settings: {},
      text: [params[:title], params[:text], params[:url]].compact.join(' '),
    }

    permit_visibilities = %w(public unlisted private direct)
    default_privacy     = current_account&.user&.setting_default_privacy
    permit_visibilities.shift(permit_visibilities.index(default_privacy) + 1) if default_privacy.present?
    state_params[:visibility] = params[:visibility] if permit_visibilities.include? params[:visibility]

    if user_signed_in? && current_user.functional?
      state_params[:settings]          = state_params[:settings].merge(Web::Setting.find_by(user: current_user)&.data || {})
      state_params[:push_subscription] = current_account.user.web_push_subscription(current_session)
      state_params[:current_account]   = current_account
      state_params[:token]             = current_session.token
      state_params[:admin]             = Account.find_local(Setting.site_contact_username.strip.gsub(/\A@/, ''))
    end

    if user_signed_in? && !current_user.functional?
      state_params[:disabled_account] = current_account
      state_params[:moved_to_account] = current_account.moved_to_account
    end

    state_params[:owner] = Account.local.without_suspended.without_internal.first if single_user_mode?

    json = ActiveModelSerializers::SerializableResource.new(InitialStatePresenter.new(state_params), serializer: InitialStateSerializer).to_json
    # rubocop:disable Rails/OutputSafety
    content_tag(:script, json_escape(json).html_safe, id: 'initial-state', type: 'application/json')
    # rubocop:enable Rails/OutputSafety
  end

  def grouped_scopes(scopes)
    scope_parser      = ScopeParser.new
    scope_transformer = ScopeTransformer.new

    scopes.each_with_object({}) do |str, h|
      scope = scope_transformer.apply(scope_parser.parse(str))

      if h[scope.key]
        h[scope.key].merge!(scope)
      else
        h[scope.key] = scope
      end
    end.values
  end

  def prerender_custom_emojis(html, custom_emojis, other_options = {})
    EmojiFormatter.new(html, custom_emojis, other_options.merge(animate: prefers_autoplay?)).to_s
  end

  private

  def storage_host_var
    ENV.fetch('S3_ALIAS_HOST', nil) || ENV.fetch('S3_CLOUDFRONT_HOST', nil) || ENV.fetch('AZURE_ALIAS_HOST', nil)
  end
end