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#include "win32/base/indicator_visibility_tracker.h"

#include "absl/time/time.h"
#include "base/clock.h"
#include "base/clock_mock.h"
#include "testing/gunit.h"
#include "win32/base/keyboard.h"

namespace mozc {
namespace win32 {
namespace {

constexpr absl::Duration kWaitDuration = absl::Milliseconds(500);
constexpr VirtualKey kAKey = VirtualKey::FromVirtualKey('A');

class IndicatorVisibilityTrackerTest : public testing::Test {
 protected:
  IndicatorVisibilityTrackerTest() : clock_mock_(absl::UnixEpoch()) {
    Clock::SetClockForUnitTest(&clock_mock_);
  }

  virtual void TearDown() { Clock::SetClockForUnitTest(nullptr); }

  void Advance(absl::Duration d) { clock_mock_.Advance(d); }

 private:
  ClockMock clock_mock_;
};

TEST_F(IndicatorVisibilityTrackerTest, BasicTest) {
  IndicatorVisibilityTracker tracker;

  EXPECT_FALSE(tracker.IsVisible()) << "Should be hidden by default.";

  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible
  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kNothing);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible
  EXPECT_EQ(tracker.OnDissociateContext(),
            IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_FALSE(tracker.IsVisible());  // KillFocus -> Invisible
  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible

  // 0 msec later -> WindowMove -> Visible
  EXPECT_EQ(tracker.OnMoveFocusedWindow(),
            IndicatorVisibilityTracker::kNothing);
  EXPECT_TRUE(tracker.IsVisible());

  // |kWaitDuration/2| later -> WindowMove -> Visible
  Advance(kWaitDuration / 2);
  EXPECT_EQ(tracker.OnMoveFocusedWindow(),
            IndicatorVisibilityTracker::kNothing);
  EXPECT_TRUE(tracker.IsVisible());

  // |kWaitDuration*2| later -> WindowMove -> Invisible
  Advance(kWaitDuration * 2);
  EXPECT_EQ(tracker.OnMoveFocusedWindow(),
            IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_FALSE(tracker.IsVisible());

  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible
  EXPECT_EQ(tracker.OnTestKey(kAKey, true, false),
            IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_FALSE(tracker.IsVisible());  // TestKeyDown -> Invisible
  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible
  EXPECT_EQ(tracker.OnKey(kAKey, true, false),
            IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_FALSE(tracker.IsVisible());  // KeyDown -> Invisible
  EXPECT_EQ(tracker.OnChangeInputMode(), IndicatorVisibilityTracker::kUpdateUI);
  EXPECT_TRUE(tracker.IsVisible());  // ChangeInputMode -> Visible
  EXPECT_EQ(tracker.OnTestKey(kAKey, false, false),
            IndicatorVisibilityTracker::kNothing);
  EXPECT_TRUE(tracker.IsVisible());  // TestKeyUp -> Visible
  EXPECT_EQ(tracker.OnKey(kAKey, false, false),
            IndicatorVisibilityTracker::kNothing);
  EXPECT_TRUE(tracker.IsVisible());  // KeyUp -> Visible
}

}  // namespace

}  // namespace win32
}  // namespace mozc
