/*
 * 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.
 *
 */

#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/table-view/table-view.h>
#include "shared/view.h"

using namespace Dali;
using namespace Dali::Toolkit;

namespace
{
const char* const BACKGROUND_IMAGE = DEMO_IMAGE_DIR "background-gradient.jpg";
const char* const TOOLBAR_IMAGE    = DEMO_IMAGE_DIR "top-bar.png";
const char* const TOOLBAR_TITLE    = "Focus Integration";
const Vector4     BACKGROUND_COLOUR(1.0f, 1.0f, 1.0f, 0.15f);

// Layout sizes
const int         MARGIN_SIZE = 10;
const int         TOP_MARGIN  = 85;
const std::string ITEMNAME[]  = {"TextLabel", "TextField", "TextEditor", "PushButton", "RadioButton", "CheckBoxButton"};

} // namespace

/**
 * @brief Shows how integrated DALi Focus works.
 */
class FocusIntegrationExample : public ConnectionTracker
{
public:
  FocusIntegrationExample(Application& application)
  : mApplication(application)
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &FocusIntegrationExample::Create);
  }

  void Create(Application& application)
  {
    mWindow            = application.GetWindow();
    Vector2 windowSize = mWindow.GetSize();
    mContentLayer      = DemoHelper::CreateView(application,
                                           mView,
                                           mToolBar,
                                           BACKGROUND_IMAGE,
                                           TOOLBAR_IMAGE,
                                           TOOLBAR_TITLE);

    TableView contentTable = TableView::New(2, 1);
    contentTable.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    contentTable.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
    contentTable.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    contentTable.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
    contentTable.SetCellPadding(Size(MARGIN_SIZE, MARGIN_SIZE * 0.5f));
    contentTable.SetProperty(Actor::Property::KEYBOARD_FOCUSABLE, true);

    for(unsigned int i = 0; i < contentTable.GetRows(); ++i)
    {
      contentTable.SetFitHeight(i);
    }
    contentTable.SetProperty(Actor::Property::POSITION, Vector2(0.0f, TOP_MARGIN));
    mContentLayer.Add(contentTable);

    // Create label to display which control's KeyEvent callback is called
    mEventLabel = TextLabel::New("Controls don't get KeyEvent yet");
    mEventLabel.SetProperty(Actor::Property::SIZE, Vector2(windowSize.width, windowSize.height * 0.1f));
    mEventLabel.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    mEventLabel.SetProperty(TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER");
    mEventLabel.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
    mEventLabel.SetBackgroundColor(Color::WHITE);
    contentTable.Add(mEventLabel);

    mContainer = TableView::New(4, 3);
    mContainer.SetProperty(Actor::Property::SIZE, Vector2(windowSize.width, windowSize.height * 0.4f));
    mContainer.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    mContainer.SetBackgroundColor(BACKGROUND_COLOUR);
    mContainer.SetCellPadding(Size(MARGIN_SIZE, MARGIN_SIZE));
    mContainer.SetRelativeHeight(0, 0.2f);
    mContainer.SetRelativeHeight(1, 0.3f);
    mContainer.SetRelativeHeight(2, 0.2f);
    mContainer.SetRelativeHeight(3, 0.3f);
    mContainer.SetProperty(Actor::Property::KEYBOARD_FOCUSABLE, true);
    contentTable.Add(mContainer);

    // Make name label for each controls
    for(int i = 0; i < 6; i++)
    {
      TextLabel itemLabel = TextLabel::New(ITEMNAME[i]);
      itemLabel.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
      itemLabel.SetBackgroundColor(BACKGROUND_COLOUR);
      itemLabel.SetProperty(TextLabel::Property::POINT_SIZE, 14.0f);
      itemLabel.SetProperty(TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER");
      itemLabel.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
      mContainer.AddChild(itemLabel, TableView::CellPosition((i / 3) * 2, i % 3));
    }

    TextLabel textLabel = TextLabel::New("TextLabel");
    mContainer.AddChild(textLabel, TableView::CellPosition(1, 0));

    TextField textField = TextField::New();
    textField.SetBackgroundColor(Color::WHITE);
    textField.SetProperty(TextField::Property::TEXT, "Text");
    mContainer.AddChild(textField, TableView::CellPosition(1, 1));

    TextEditor textEditor = TextEditor::New();
    textEditor.SetBackgroundColor(Color::WHITE);
    textEditor.SetProperty(TextEditor::Property::TEXT, "Text\nText");
    mContainer.AddChild(textEditor, TableView::CellPosition(1, 2));

    PushButton pushButton = PushButton::New();
    mContainer.AddChild(pushButton, TableView::CellPosition(3, 0));

    RadioButton radioButton = RadioButton::New();
    mContainer.AddChild(radioButton, TableView::CellPosition(3, 1));

    CheckBoxButton checkBoxButton = CheckBoxButton::New();
    mContainer.AddChild(checkBoxButton, TableView::CellPosition(3, 2));

    // Set name and keyboard focusable for each controls
    for(int i = 0; i < 6; i++)
    {
      Control control = Control::DownCast(mContainer.GetChildAt(TableView::CellPosition((i / 3) * 2 + 1, i % 3)));
      control.SetProperty(Actor::Property::KEYBOARD_FOCUSABLE, true);
      control.SetProperty(Dali::Actor::Property::NAME, ITEMNAME[i]);
      control.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
      control.KeyEventSignal().Connect(this, &FocusIntegrationExample::OnControlKeyEvent);
    }

    KeyboardFocusManager::Get().PreFocusChangeSignal().Connect(this, &FocusIntegrationExample::OnPreFocusChange);

    // Respond to key events
    mWindow.KeyEventSignal().Connect(this, &FocusIntegrationExample::OnKeyEvent);
  }

  // Callback for KeyboardFocusManager
  Actor OnPreFocusChange(Actor current, Actor next, Control::KeyboardFocus::Direction direction)
  {
    if(!current && !next)
    {
      next = mContainer.GetChildAt(TableView::CellPosition(1, 0));
    }
    return next;
  }

  // Callback for each controls.
  // Display current control name.
  bool OnControlKeyEvent(Control control, const KeyEvent& event)
  {
    std::string controlName = control.GetProperty<std::string>(Dali::Actor::Property::NAME);
    mEventLabel.SetProperty(TextLabel::Property::TEXT, controlName + "'s KeyEvent works\n");

    return false;
  }

private:
  /**
   * 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;
  Window           mWindow;
  TableView        mContainer;
  TextLabel        mEventLabel;
  Toolkit::Control mView;         ///< The View instance.
  Toolkit::ToolBar mToolBar;      ///< The View's Toolbar.
  Layer            mContentLayer; ///< Content layer.
};

//
int DALI_EXPORT_API main(int argc, char** argv)
{
  Application application = Application::New(&argc, &argv);

  FocusIntegrationExample test(application);

  application.MainLoop();

  return 0;
}