class ChefCLI::Policyfile::UndoRecord

def load(data)
  reset!
  unless data.is_a?(Hash)
    raise InvalidUndoRecord, "Undo data is incorrectly formatted. Must be a Hash, got '#{data}'."
  end
  missing_fields = %w{ format_version description backup_data }.select { |key| !data.key?(key) }
  unless missing_fields.empty?
    raise InvalidUndoRecord, "Undo data is missing mandatory field(s) #{missing_fields.join(", ")}. Undo data: '#{data}'"
  end
  @description = data["description"]
  policy_data = data["backup_data"]
  unless policy_data.is_a?(Hash)
    raise InvalidUndoRecord, "'backup_data' in the undo record is incorrectly formatted. Must be a Hash, got '#{policy_data}'"
  end
  missing_policy_data_fields = %w{ policy_groups policy_revisions }.select { |key| !policy_data.key?(key) }
  unless missing_policy_data_fields.empty?
    raise InvalidUndoRecord,
      "'backup_data' in the undo record is missing mandatory field(s) #{missing_policy_data_fields.join(", ")}. Backup data: #{policy_data}"
  end
  policy_groups = policy_data["policy_groups"]
  unless policy_groups.is_a?(Array)
    raise InvalidUndoRecord,
      "'policy_groups' data in the undo record is incorrectly formatted. Must be an Array, got '#{policy_groups}'"
  end
  @policy_groups = policy_groups
  policy_revisions = policy_data["policy_revisions"]
  unless policy_revisions.is_a?(Array)
    raise InvalidUndoRecord,
      "'policy_revisions' data in the undo record is incorrectly formatted. Must be an Array, got '#{policy_revisions}'"
  end
  policy_revisions.each do |revision|
    unless revision.is_a?(Hash)
      raise InvalidUndoRecord,
        "Invalid item in 'policy_revisions' in the undo record. Must be a Hash, got '#{revision}'"
    end
    @policy_revisions << PolicyGroupRestoreData.new.load(revision)
  end
  self
end