module AuthHelper
  PROVIDERS_WITH_ICONS = %w(twitter github gitlab bitbucket google_oauth2).freeze
  FORM_BASED_PROVIDERS = [/\Aldap/, 'kerberos'].freeze

  def ldap_enabled?
    Gitlab.config.ldap.enabled
  end

  def provider_has_icon?(name)
    PROVIDERS_WITH_ICONS.include?(name.to_s)
  end

  def auth_providers
    Gitlab::OAuth::Provider.providers
  end

  def label_for_provider(name)
    Gitlab::OAuth::Provider.label_for(name)
  end

  def form_based_provider?(name)
    FORM_BASED_PROVIDERS.any? { |pattern| pattern === name.to_s }
  end

  def form_based_providers
    auth_providers.select { |provider| form_based_provider?(provider) }
  end

  def button_based_providers
    auth_providers.reject { |provider| form_based_provider?(provider) }
  end

  def provider_image_tag(provider, size = 64)
    label = label_for_provider(provider)

    if provider_has_icon?(provider)
      file_name = "#{provider.to_s.split('_').first}_#{size}.png"

      image_tag(image_path("auth_buttons/#{file_name}"), alt: label, title: "Sign in with #{label}")
    else
      label
    end
  end

  def auth_active?(provider)
    current_user.identities.exists?(provider: provider.to_s)
  end

  extend self
end