# Gitlab::VisibilityLevel module
#
# Define allowed public modes that can be used for
# GitLab projects to determine project public mode
#
module Gitlab
  module VisibilityLevel
    extend CurrentSettings
    extend ActiveSupport::Concern

    included do
      scope :public_only,               -> { where(visibility_level: PUBLIC) }
      scope :public_and_internal_only,  -> { where(visibility_level: [PUBLIC, INTERNAL] ) }
      scope :non_public_only,           -> { where.not(visibility_level: PUBLIC) }

      scope :public_to_user, -> (user) do
        if user
          if user.admin?
            all
          elsif !user.external?
            public_and_internal_only
          else
            public_only
          end
        else
          public_only
        end
      end
    end

    PRIVATE  = 0 unless const_defined?(:PRIVATE)
    INTERNAL = 10 unless const_defined?(:INTERNAL)
    PUBLIC   = 20 unless const_defined?(:PUBLIC)

    class << self
      delegate :values, to: :options

      def string_values
        string_options.keys
      end

      def options
        {
          'Private'  => PRIVATE,
          'Internal' => INTERNAL,
          'Public'   => PUBLIC
        }
      end

      def string_options
        {
          'private'  => PRIVATE,
          'internal' => INTERNAL,
          'public'   => PUBLIC
        }
      end

      def highest_allowed_level
        restricted_levels = current_application_settings.restricted_visibility_levels

        allowed_levels = self.values - restricted_levels
        allowed_levels.max || PRIVATE
      end

      def allowed_for?(user, level)
        user.is_admin? || allowed_level?(level.to_i)
      end

      # Return true if the specified level is allowed for the current user.
      # Level should be a numeric value, e.g. `20`.
      def allowed_level?(level)
        valid_level?(level) && non_restricted_level?(level)
      end

      def non_restricted_level?(level)
        restricted_levels = current_application_settings.restricted_visibility_levels

        if restricted_levels.nil?
          true
        else
          !restricted_levels.include?(level)
        end
      end

      def valid_level?(level)
        options.has_value?(level)
      end

      def level_name(level)
        level_name = 'Unknown'
        options.each do |name, lvl|
          level_name = name if lvl == level.to_i
        end

        level_name
      end

      def level_value(level)
        return string_options[level] if level.is_a? String
        level
      end

      def string_level(level)
        string_options.key(level)
      end
    end

    def private?
      visibility_level_value == PRIVATE
    end

    def internal?
      visibility_level_value == INTERNAL
    end

    def public?
      visibility_level_value == PUBLIC
    end

    def visibility_level_value
      self[visibility_level_field]
    end

    def visibility
      Gitlab::VisibilityLevel.string_level(visibility_level_value)
    end

    def visibility=(level)
      self[visibility_level_field] = Gitlab::VisibilityLevel.level_value(level)
    end
  end
end
