// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/animation/slide_animation.h"

#include <memory>

#include "base/macros.h"
#include "base/test/scoped_task_environment.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/animation/test_animation_delegate.h"

namespace gfx {

// Class to provide access to SlideAnimation internals for testing.
class SlideAnimation::TestApi {
 public:
  explicit TestApi(SlideAnimation* animation) : animation_(animation) {}

  void SetStartTime(base::TimeTicks ticks) {
    animation_->SetStartTime(ticks);
  }

  void Step(base::TimeTicks ticks) {
    animation_->Step(ticks);
  }

 private:
  SlideAnimation* animation_;

  DISALLOW_COPY_AND_ASSIGN(TestApi);
};

////////////////////////////////////////////////////////////////////////////////
// SlideAnimationTest
class SlideAnimationTest: public testing::Test {
 protected:
  SlideAnimationTest()
      : scoped_task_environment_(
            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}

 private:
  base::test::ScopedTaskEnvironment scoped_task_environment_;
};

// Tests animation construction.
TEST_F(SlideAnimationTest, InitialState) {
  SlideAnimation animation(nullptr);
  // By default, slide animations are 60 Hz, so the timer interval should be
  // 1/60th of a second.
  EXPECT_EQ(1000 / 60, animation.timer_interval().InMilliseconds());
  // Duration defaults to 120 ms.
  EXPECT_EQ(120, animation.GetSlideDuration());
  // Slide is neither showing nor closing.
  EXPECT_FALSE(animation.IsShowing());
  EXPECT_FALSE(animation.IsClosing());
  // Starts at 0.
  EXPECT_EQ(0.0, animation.GetCurrentValue());
}

TEST_F(SlideAnimationTest, Basics) {
  SlideAnimation animation(nullptr);
  SlideAnimation::TestApi test_api(&animation);

  // Use linear tweening to make the math easier below.
  animation.SetTweenType(Tween::LINEAR);

  // Duration can be set after construction.
  animation.SetSlideDuration(100);
  EXPECT_EQ(100, animation.GetSlideDuration());

  // Show toggles the appropriate state.
  animation.Show();
  EXPECT_TRUE(animation.IsShowing());
  EXPECT_FALSE(animation.IsClosing());

  // Simulate running the animation.
  test_api.SetStartTime(base::TimeTicks());
  test_api.Step(base::TimeTicks() + base::TimeDelta::FromMilliseconds(50));
  EXPECT_EQ(0.5, animation.GetCurrentValue());

  // We can start hiding mid-way through the animation.
  animation.Hide();
  EXPECT_FALSE(animation.IsShowing());
  EXPECT_TRUE(animation.IsClosing());

  // Reset stops the animation.
  animation.Reset();
  EXPECT_EQ(0.0, animation.GetCurrentValue());
  EXPECT_FALSE(animation.IsShowing());
  EXPECT_FALSE(animation.IsClosing());
}

// Tests that delegate is not notified when animation is running and is deleted.
// (Such a scenario would cause problems for BoundsAnimator).
TEST_F(SlideAnimationTest, DontNotifyOnDelete) {
  TestAnimationDelegate delegate;
  std::unique_ptr<SlideAnimation> animation(new SlideAnimation(&delegate));

  // Start the animation.
  animation->Show();

  // Delete the animation.
  animation.reset();

  // Make sure the delegate wasn't notified.
  EXPECT_FALSE(delegate.finished());
  EXPECT_FALSE(delegate.canceled());
}

}  // namespace gfx