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#ifndef MOZC_SESSION_SESSION_USAGE_OBSERVER_H_
#define MOZC_SESSION_SESSION_USAGE_OBSERVER_H_

#include <map>
#include <vector>
#include "base/base.h"
#include "session/session_observer_interface.h"
#include "session/state.pb.h"

namespace mozc {
namespace commands {
class Command;
}  // namespace mozc::commands

namespace session {

class SessionUsageObserver : public SessionObserverInterface {
 public:
  SessionUsageObserver();
  virtual ~SessionUsageObserver();

  void EvalCommandHandler(const commands::Command &command);
  void Reload();
  // Sets interval times for cache flash
  void SetInterval(uint32 val);

 private:
  // Save cached stats.
  void SaveStats();
  void EvalCreateSession(const commands::Input &input,
                        const commands::Output &output,
                        map<uint64, SessionState> *states);
  void EvalSendKey(const commands::Input &input,
                   const commands::Output &output,
                   SessionState *state);
  void UpdateState(const commands::Output &output,
                   SessionState *state);
  void CheckOutput(const commands::Input &input,
                   const commands::Output &output,
                   SessionState *state);
  // Update stats. Values are cached.
  void IncrementCount(const string &name);
  void UpdateTiming(const string &name, uint64 val);
  void SetInteger(const string &name, int val);
  void SetBoolean(const string &name, bool val);

  uint32 update_count_;
  uint32 save_interval_;
  map<uint64, SessionState> states_;
  map<string, uint32> count_cache_;
  map<string, vector<uint32> > timing_cache_;
  map<string, int> integer_cache_;
  map<string, bool> boolean_cache_;
  DISALLOW_COPY_AND_ASSIGN(SessionUsageObserver);
};
}  // namespace mozc::session
}  // namespace mozc

#endif  // MOZC_SESSION_SESSION_USAGE_OBSERVER_H_