// Copyright 2015 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 "cc/input/scroll_state.h"

#include "cc/layers/layer_impl.h"
#include "cc/test/fake_impl_task_runner_provider.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/test_shared_bitmap_manager.h"
#include "cc/test/test_task_graph_runner.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {

class ScrollStateTest : public testing::Test {};

TEST_F(ScrollStateTest, ConsumeDeltaNative) {
  const float delta_x = 12.3f;
  const float delta_y = 3.9f;

  const float delta_x_to_consume = 1.2f;
  const float delta_y_to_consume = 2.3f;

  ScrollState scrollState(delta_x, delta_y, 0, 0, false /* should_propagate */,
                          false /* delta_consumed_for_scroll_sequence */,
                          false /* is_direct_manipulation */);
  EXPECT_FLOAT_EQ(delta_x, scrollState.delta_x());
  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
  EXPECT_FALSE(scrollState.delta_consumed_for_scroll_sequence());
  EXPECT_FALSE(scrollState.FullyConsumed());

  scrollState.ConsumeDelta(0, 0);
  EXPECT_FLOAT_EQ(delta_x, scrollState.delta_x());
  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
  EXPECT_FALSE(scrollState.delta_consumed_for_scroll_sequence());
  EXPECT_FALSE(scrollState.FullyConsumed());

  scrollState.ConsumeDelta(delta_x_to_consume, 0);
  EXPECT_FLOAT_EQ(delta_x - delta_x_to_consume, scrollState.delta_x());
  EXPECT_FLOAT_EQ(delta_y, scrollState.delta_y());
  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
  EXPECT_FALSE(scrollState.FullyConsumed());

  scrollState.ConsumeDelta(0, delta_y_to_consume);
  EXPECT_FLOAT_EQ(delta_x - delta_x_to_consume, scrollState.delta_x());
  EXPECT_FLOAT_EQ(delta_y - delta_y_to_consume, scrollState.delta_y());
  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
  EXPECT_FALSE(scrollState.FullyConsumed());

  scrollState.ConsumeDelta(scrollState.delta_x(), scrollState.delta_y());
  EXPECT_TRUE(scrollState.delta_consumed_for_scroll_sequence());
  EXPECT_TRUE(scrollState.FullyConsumed());
}

TEST_F(ScrollStateTest, CurrentNativeScrollingScrollable) {
  ScrollState scrollState(0, 0, 0, 0, false, false, false);

  FakeImplTaskRunnerProvider task_runner_provider;
  TestSharedBitmapManager shared_bitmap_manager;
  TestTaskGraphRunner task_graph_runner;
  FakeLayerTreeHostImpl host_impl(&task_runner_provider, &shared_bitmap_manager,
                                  &task_graph_runner);

  scoped_ptr<LayerImpl> layer_impl =
      LayerImpl::Create(host_impl.active_tree(), 1);
  scrollState.set_current_native_scrolling_layer(layer_impl.get());
  EXPECT_EQ(layer_impl.get(), scrollState.current_native_scrolling_layer());
}

TEST_F(ScrollStateTest, FullyConsumed) {
  ScrollState scrollState(1, 3, 0, 0, 0, false, false);
  EXPECT_FALSE(scrollState.FullyConsumed());

  scrollState.ConsumeDelta(1, 3);
  EXPECT_TRUE(scrollState.FullyConsumed());
}
}  // namespace cc