# Copyright (C) 2012-2021 Zammad Foundation, http://zammad-foundation.org/

class Auth
  class Backend

    attr_reader :auth

    def initialize(auth)
      @auth = auth
    end

    def valid?
      instances.any? do |instance|
        next if !instance.valid?

        Rails.logger.info "Authentication against #{instance.class.name} for user #{auth.user.login} ok."

        true
      end
    end

    private

    def instances
      configs.filter_map do |config|
        config[:adapter].constantize.new(config, auth)
      rescue => e
        Rails.logger.error "Failed to load Auth::Backend from Setting '#{config}'"
        Rails.logger.error e
        nil
      end
    end

    def configs
      Setting.where(area: 'Security::Authentication')
      .map { |setting| setting.state_current[:value] } # extract current Setting value as config
      .reject(&:blank?)
      .sort { |a, b| a.fetch(:priority, 999) <=> b.fetch(:priority, 999) } # sort by priority and fallback to append if not set
    end
  end
end