// Copyright 2014 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 CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_
#define CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_

#include <list>
#include <string>

#include "base/time/time.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/device_event_log.h"

namespace chromeos {

namespace device_event_log {

class CHROMEOS_EXPORT DeviceEventLogImpl {
 public:
  struct LogEntry {
    LogEntry(const char* filedesc,
             int file_line,
             LogType log_type,
             LogLevel log_level,
             const std::string& event);

    std::string file;
    int file_line;
    LogType log_type;
    LogLevel log_level;
    std::string event;
    base::Time time;
    int count;
  };

  explicit DeviceEventLogImpl(size_t max_entries);
  ~DeviceEventLogImpl();

  // Implements device_event_log::AddEntry.
  void AddEntry(const char* file,
                int file_line,
                LogType type,
                LogLevel level,
                const std::string& event);

  // Implements device_event_log::GetAsString.
  std::string GetAsString(StringOrder order,
                          const std::string& format,
                          const std::string& types,
                          LogLevel max_level,
                          size_t max_events);

  // Called from device_event_log::AddEntry if the global instance has not been
  // created (or has already been destroyed). Logs to LOG(ERROR) or VLOG(1).
  static void SendToVLogOrErrorLog(const char* file,
                                   int file_line,
                                   LogType type,
                                   LogLevel log_level,
                                   const std::string& event);

 private:
  friend class DeviceEventLogTest;

  typedef std::list<LogEntry> LogEntryList;

  void AddLogEntry(const LogEntry& entry);

  // For testing
  size_t max_entries() const { return max_entries_; }
  void set_max_entries_for_test(size_t entries) { max_entries_ = entries; }

  size_t max_entries_;
  LogEntryList entries_;

  DISALLOW_COPY_AND_ASSIGN(DeviceEventLogImpl);
};

}  // namespace device_event_log

}  // namespace chromeos

#endif  // CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_