require "shellwords"

module NexusSW
  module LXD
    class Transport
      module Mixins
        module Helpers
          module UsersMixin
            def user(user_nameorid, options = {})
              return unless user_nameorid
              passwd = read_file options[:passwd_file] || "/etc/passwd"

              # rework into .split(':') if this gets more complicated
              @uid = user_nameorid.is_a?(String) ? passwd[/^#{user_nameorid}:[^:]*:([^:]*):/, 1] : user_nameorid
              @username = user_nameorid.is_a?(String) ? user_nameorid : passwd[/^([^:]*):[^:]*:#{user_nameorid}:/, 1]
              raise "User not found (#{user_nameorid}) while attempting to set transport identity" unless @uid && @username

              # gotcha: we're always setting the default group here, but it's changeable by the user, afterwards
              # so if `user` gets called again, and the caller wants an alternative gid, the caller will need to re-set the gid
              @gid = passwd[/^[^:]*:[^:]*:#{uid}:([^:]*):/, 1]
            end

            attr_accessor :file_mode, :gid
            attr_reader :uid, :username

            def reset_user
              @username = @uid = @gid = nil
            end

            private

            def runas_command(command, options = {})
              uname = options[:runas] || username
              return command unless uname
              command = command.shelljoin if command.is_a? Array
              ["su", uname, "-c", command]
            end
          end
        end
      end
    end
  end
end