// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_POLICY_POLICY_LOAD_STATUS_H_
#define CHROME_BROWSER_POLICY_POLICY_LOAD_STATUS_H_

#include <bitset>

#include "base/basictypes.h"

namespace base {
class HistogramBase;
}

namespace policy {

// UMA histogram enum for policy load status. Don't change existing constants,
// append additional constants to the end if needed.
enum PolicyLoadStatus {
  // Policy load attempt started. This gets logged for each policy load attempt
  // to get a baseline on the number of requests, and an arbitrary number of
  // the below status codes may get added in addition.
  POLICY_LOAD_STATUS_STARTED,
  // System failed to determine whether there's policy.
  POLICY_LOAD_STATUS_QUERY_FAILED,
  // No policy present.
  POLICY_LOAD_STATUS_NO_POLICY,
  // Data inaccessible, such as non-local policy file.
  POLICY_LOAD_STATUS_INACCCESSIBLE,
  // Data missing, such as policy file not present.
  POLICY_LOAD_STATUS_MISSING,
  // Trying with Wow64 redirection disabled.
  POLICY_LOAD_STATUS_WOW64_REDIRECTION_DISABLED,
  // Data read error, for example file reading errors.
  POLICY_LOAD_STATUS_READ_ERROR,
  // Data too large to process.
  POLICY_LOAD_STATUS_TOO_BIG,
  // Parse error.
  POLICY_LOAD_STATUS_PARSE_ERROR,

  // This must stay last.
  POLICY_LOAD_STATUS_SIZE
};

// A helper for generating policy load status UMA statistics that'll collect
// histogram samples for a policy load operation and records histogram samples
// for the status codes that were seen on destruction.
class PolicyLoadStatusSample {
 public:
  PolicyLoadStatusSample();
  ~PolicyLoadStatusSample();

  // Adds a status code.
  void Add(PolicyLoadStatus status);

 private:
  std::bitset<POLICY_LOAD_STATUS_SIZE> status_bits_;
  base::HistogramBase* histogram_;

  DISALLOW_COPY_AND_ASSIGN(PolicyLoadStatusSample);
};

}  // namespace policy

#endif  // CHROME_BROWSER_POLICY_POLICY_LOAD_STATUS_H_