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#ifndef MOZC_WIN32_TIP_TIP_INPUT_MODE_MANAGER_H_
#define MOZC_WIN32_TIP_TIP_INPUT_MODE_MANAGER_H_

#include <Windows.h>
#include <InputScope.h>

#include <memory>
#include <vector>

#include "base/port.h"
#include "win32/base/input_state.h"
#include "win32/base/keyboard.h"

namespace mozc {
namespace win32 {
namespace tsf {

// Exposed for unit testing.
class TipInputModeManagerImpl {
 public:
  enum ConversionMode {
    kDirect,
    kHiragana,
    kFullKatakana,
    kHalfAscii,
    kFullAscii,
    kHalfKatakana,
  };
  class StatePair {
   public:
    StatePair();
    StatePair(bool open_close, ConversionMode conversion_mode);
    bool open_close;
    ConversionMode conversion_mode;
  };

 protected:
  static StatePair GetOverriddenState(const StatePair &base_state,
                                      const vector<InputScope> &input_scopes);
};

// In TSF, IME open/close mode and conversion mode are managed per thread not
// per context. This class is designed to be instantiated per thread so that it
// can manage such IME status.
// Another design goal of this class is to manage two IME status separately: one
// is for Mozc (effective status) and the other is for TSF (TSF status). Note
// that TSF status is now shared in all the applications by default starting
// with Windows 8, while Mozc status is context local and valid only in the
// Mozc session. For example, if InputScope that is associated with a local
// context represents that IME should be turned off, its status can be Mozc
// local because so that the behavior can be the same to password field.
// This class is a composition of input mode manager itself and
// IndicatorVisibilityTracker.
class TipInputModeManager : public TipInputModeManagerImpl {
 public:
  enum Action {
    kDoNothing = 0,
    kUpdateUI  = 1,
  };
  enum NotifyAction {
    kNotifyNothing              = 0,
    kNotifySystemOpenClose      = (1 << 0),
    kNotifySystemConversionMode = (1 << 1),
  };
  class Config {
   public:
    Config();
    bool use_global_mode;
  };
  typedef uint32 NotifyActionSet;

  explicit TipInputModeManager(const Config &config);
  ~TipInputModeManager();

  // Functions to access embedded IndicatorVisibilityTracker.
  Action OnDissociateContext();
  Action OnTestKey(const VirtualKey &key, bool is_down, bool eaten);
  Action OnKey(const VirtualKey &key, bool is_down, bool eaten);
  Action OnMoveFocusedWindow();
  bool IsIndicatorVisible() const;

  void OnInitialize(bool system_open_close_mode,
                    DWORD system_conversion_mode);
  NotifyActionSet OnReceiveCommand(bool mozc_open_close_mode,
                                   DWORD mozc_logical_mode,
                                   DWORD mozc_visible_mode);
  Action OnSetFocus(bool system_open_close_mode,
                    DWORD system_conversion_mode,
                    const vector<InputScope> &input_scopes);
  Action OnChangeOpenClose(bool new_open_close_mode);
  Action OnChangeConversionMode(DWORD new_conversion_mode);
  Action OnChangeInputScope(const vector<InputScope> &input_scopes);

  // Returns IME open/close state that is visible from Mozc session.
  bool GetEffectiveOpenClose() const;
  // Returns IME open/close state that is visible from TSF.
  bool GetTsfOpenClose() const;
  // Returns IME conversion mode that is visible from Mozc session.
  ConversionMode GetEffectiveConversionMode() const;
  // Returns IME conversion mode that is visible from TSF.
  ConversionMode GetTsfConversionMode() const;

 private:
  class InternalState;
  std::unique_ptr<InternalState> state_;

  DISALLOW_COPY_AND_ASSIGN(TipInputModeManager);
};

}  // namespace tsf
}  // namespace win32
}  // namespace mozc

#endif  // MOZC_WIN32_TIP_TIP_INPUT_MODE_MANAGER_H_