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#include "win32/base/indicator_visibility_tracker.h"

#include "absl/time/time.h"
#include "base/stopwatch.h"

namespace mozc {
namespace win32 {
namespace {

constexpr absl::Duration kIgnoreMoveWindowDuration = absl::Milliseconds(500);

IndicatorVisibilityTracker::Action GetDefaultAction(bool previously_visible,
                                                    bool now_visible) {
  if (previously_visible == now_visible) {
    return IndicatorVisibilityTracker::kNothing;
  }
  return IndicatorVisibilityTracker::kUpdateUI;
}

}  // namespace


IndicatorVisibilityTracker::Action
IndicatorVisibilityTracker::OnDissociateContext() {
  const bool original = visible_;
  visible_ = false;
  mode_changed_.Reset();
  return GetDefaultAction(original, visible_);
}

IndicatorVisibilityTracker::Action IndicatorVisibilityTracker::OnTestKey(
    const VirtualKey &key, bool is_down, bool eaten) {
  if (!is_down) {
    return kNothing;
  }
  const bool original = visible_;
  visible_ = false;
  mode_changed_.Reset();
  return GetDefaultAction(original, visible_);
}

IndicatorVisibilityTracker::Action IndicatorVisibilityTracker::OnKey(
    const VirtualKey &key, bool is_down, bool eaten) {
  if (!is_down) {
    return kNothing;
  }
  const bool original = visible_;
  visible_ = false;
  mode_changed_.Reset();
  return GetDefaultAction(original, visible_);
}

IndicatorVisibilityTracker::Action
IndicatorVisibilityTracker::OnMoveFocusedWindow() {
  const bool original = visible_;
  if (mode_changed_.IsRunning()) {
    if (mode_changed_.GetElapsed() >= kIgnoreMoveWindowDuration) {
      mode_changed_.Reset();
      visible_ = false;
    }
  } else {
    visible_ = false;
  }
  return GetDefaultAction(original, visible_);
}

IndicatorVisibilityTracker::Action
IndicatorVisibilityTracker::OnChangeInputMode() {
  const bool original = visible_;
  visible_ = true;
  mode_changed_.Stop();
  mode_changed_.Reset();
  mode_changed_.Start();
  return GetDefaultAction(original, visible_);
}

}  // namespace win32
}  // namespace mozc
