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#ifndef MOZC_UNIX_IBUS_PROPERTY_HANDLER_INTERFACE_H_
#define MOZC_UNIX_IBUS_PROPERTY_HANDLER_INTERFACE_H_

#include "base/port.h"
// TODO(nona): remove this header.
#include "session/commands.pb.h"  // For CompositionMode

namespace mozc {
namespace ibus {

class PropertyHandlerInterface {
 public:
  PropertyHandlerInterface() {}
  virtual ~PropertyHandlerInterface() {}

  // Registers current properties into engine.
  virtual void Register(IBusEngine *engine) = 0;

  virtual void ResetContentType(IBusEngine *engine) = 0;
  virtual void UpdateContentType(IBusEngine *engine) = 0;

  // Update properties.
  virtual void Update(IBusEngine *engine,
                      const commands::Output &output) = 0;

  virtual void ProcessPropertyActivate(IBusEngine *engine,
                                       const gchar *property_name,
                                       guint property_state) = 0;

  // Following two methods represent two aspects of an IME state.
  // * (activated, disabled) == (false, false)
  //     This is the state so-called "IME is off". However, an IME is expected
  //     to monitor keyevents that are assigned to DirectMode. A user should be
  //     able to turn on the IME by using shortcut or GUI menu.
  // * (activated, disabled) == (false, true)
  //     This is a state where an IME is expected to do nothing. A user should
  //     be unable to turn on the IME by using shortcut nor GUI menu. This state
  //     is used mainly on the password field. IME becomes to be "turned-off"
  //     once |disabled| state is flipped to false.
  // * (activated, disabled) == (true, false)
  //     This is the state so-called "IME is on". A user should be able to turn
  //     off the IME by using shortcut or GUI menu.
  // * (activated, disabled) == (true, true)
  //     This is the state where an IME is expected to do nothing. A user should
  //     be unable to turn on the IME by using shortcut nor GUI menu. This state
  //     is used mainly on the password field. IME becomes to be "turned-on"
  //     once |disabled| state is flipped to false.
  virtual bool IsActivated() const = 0;
  virtual bool IsDisabled() const = 0;

  // Returns original composition mode before.
  virtual commands::CompositionMode GetOriginalCompositionMode() const = 0;
};

}  // namespace ibus
}  // namespace mozc
#endif  // MOZC_UNIX_IBUS_PROPERTY_HANDLER_INTERFACE_H_