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#include "win32/tip/tip_thread_context.h"

#include <limits>
#include <memory>

#include "base/win_util.h"
#include "win32/base/focus_hierarchy_observer.h"
#include "win32/tip/tip_input_mode_manager.h"

using std::unique_ptr;

namespace mozc {
namespace win32 {
namespace tsf {

namespace {

TipInputModeManager::Config GetConfig() {
  TipInputModeManager::Config config;
  config.use_global_mode = WinUtil::IsPerUserInputSettingsEnabled();
  return config;
}

}  // namespace

class TipThreadContext::InternalState {
 public:
  InternalState() : input_mode_manager(GetConfig()), focus_revision(0) {}
  TipInputModeManager input_mode_manager;
  unique_ptr<FocusHierarchyObserver> focus_hierarchy_observer;
  int32 focus_revision;
};

TipThreadContext::TipThreadContext() : state_(new InternalState) {}

TipThreadContext::~TipThreadContext() {}

TipInputModeManager *TipThreadContext::GetInputModeManager() {
  return &state_->input_mode_manager;
}

const FocusHierarchyObserver *TipThreadContext::GetFocusHierarchyObserver()
    const {
  return state_->focus_hierarchy_observer.get();
}

void TipThreadContext::InitializeFocusHierarchyObserver() {
  if (state_->focus_hierarchy_observer.get() == nullptr) {
    state_->focus_hierarchy_observer.reset(FocusHierarchyObserver::Create());
    state_->focus_hierarchy_observer->SyncFocusHierarchy();
  }
}

int32 TipThreadContext::GetFocusRevision() const {
  return state_->focus_revision;
}

void TipThreadContext::IncrementFocusRevision() {
  if (state_->focus_revision < std::numeric_limits<int32>::max()) {
    state_->focus_revision++;
  } else {
    state_->focus_revision = 0;
  }
}

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