/*
 * Copyright (c) 2020 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

// EXTERNAL INCLUDES
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/table-view/table-view.h>
#include <iostream>

// INTERNAL INCLUDES
#include "emoji-strings.h"

using namespace Dali;
using namespace Dali::Toolkit;
using namespace EmojiStrings;

// TODO Need to expose Text::RENDER.....
const int ATLAS_RENDERER = 0;

// This example shows how to create and display Hello World! using a simple TextActor
//
class EmojiExample : public ConnectionTracker
{
public:
  typedef uint32_t SizeType;

  EmojiExample(Application& application)
  : mApplication(application),
    mLastPoint(0.0f)
  {
    std::cout << "EmoticonController::EmoticonController" << std::endl;

    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &EmojiExample::Create);
  }

  ~EmojiExample()
  {
    // Nothing to do here;
  }

  // The Init signal is received once (only) during the Application lifetime
  void Create(Application& application)
  {
    Window window = application.GetWindow();
    window.SetBackgroundColor(Color::WHITE);
    window.KeyEventSignal().Connect(this, &EmojiExample::OnKeyEvent);

    mTableView = Toolkit::TableView::New(NUMBER_OF_EMOJIS, 1);
    mTableView.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    mTableView.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
    mTableView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
    mTableView.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    mTableView.TouchedSignal().Connect(this, &EmojiExample::OnTouch);
    window.Add(mTableView);

    for(unsigned int index = 0u; index < NUMBER_OF_EMOJIS; ++index)
    {
      const Emoji&      emoji = EMOJIS[index];
      const std::string text  = emoji.mUTF8 + " " + emoji.mDescription;

      TextLabel label = TextLabel::New(text);
      label.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER);
      label.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
      label.SetProperty(TextLabel::Property::MULTI_LINE, true);

      mTableView.SetFitHeight(index);
      mTableView.AddChild(label, Toolkit::TableView::CellPosition(index, 0));
    }
  }

  bool OnTouch(Actor actor, const TouchEvent& event)
  {
    if(1u == event.GetPointCount())
    {
      const PointState::Type state = event.GetState(0);

      // Clamp to integer values; this is to reduce flicking due to pixel misalignment
      const float localPoint = static_cast<float>(static_cast<int>(event.GetLocalPosition(0).y));

      if(PointState::DOWN == state)
      {
        mLastPoint = localPoint;
        mAnimation = Animation::New(0.25f);
      }
      else if(PointState::MOTION == state)
      {
        if(mAnimation)
        {
          mAnimation.AnimateBy(Property(mTableView, Actor::Property::POSITION), Vector3(0.f, localPoint - mLastPoint, 0.f), AlphaFunction::LINEAR);
          mAnimation.Play();
          mLastPoint = localPoint;
        }
      }
    }

    return true;
  }

  /**
   * Main key event handler
   */
  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.GetState() == KeyEvent::DOWN)
    {
      if(IsKey(event, DALI_KEY_ESCAPE) || IsKey(event, DALI_KEY_BACK))
      {
        mApplication.Quit();
      }
    }
  }

private:
  Application& mApplication;
  TableView    mTableView;
  Animation    mAnimation;
  float        mLastPoint;
};

int DALI_EXPORT_API main(int argc, char** argv)
{
  Application  application = Application::New(&argc, &argv, DEMO_THEME_PATH);
  EmojiExample test(application);
  application.MainLoop();
  return 0;
}