/*
 * 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.
 *
 */

/**
 * @file text-field-example.cpp
 * @brief Basic usage of TextField control
 */

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

// INTERNAL INCLUDES
#include "shared/multi-language-strings.h"
#include "shared/view.h"

using namespace Dali;
using namespace Dali::Toolkit;
using namespace MultiLanguageStrings;

namespace
{
const char* const FOLDER_ICON_IMAGE      = DEMO_IMAGE_DIR "folder_appicon_empty_bg.png";
const char* const FOLDER_OPEN_ICON_IMAGE = DEMO_IMAGE_DIR "folder_appicon_empty_open_bg.png";

const float BORDER_WIDTH = 4.0f;

} // unnamed namespace

/**
 * @brief The main class of the demo.
 */
class TextFieldExample : public ConnectionTracker
{
public:
  TextFieldExample(Application& application)
  : mApplication(application)
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &TextFieldExample::Create);
  }

  ~TextFieldExample()
  {
    // Nothing to do here.
  }

  /**
   * One-time setup in response to Application InitSignal.
   */
  void Create(Application& application)
  {
    Window window = application.GetWindow();

    window.SetBackgroundColor(Vector4(0.04f, 0.345f, 0.392f, 1.0f));
    window.KeyEventSignal().Connect(this, &TextFieldExample::OnKeyEvent);

    mButton = CreateFolderButton();
    mButton.ClickedSignal().Connect(this, &TextFieldExample::OnButtonClicked);
    window.Add(mButton);
  }

  PushButton CreateFolderButton()
  {
    PushButton button = PushButton::New();
    button.SetProperty(Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, FOLDER_ICON_IMAGE);
    button.SetProperty(Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, FOLDER_OPEN_ICON_IMAGE);
    button.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    return button;
  }

  bool OnButtonClicked(Toolkit::Button button)
  {
    Window  window     = mApplication.GetWindow();
    Vector2 windowSize = window.GetSize();

    // Remove previously hidden pop-up
    UnparentAndReset(mPopup);

    // Launch a pop-up containing TextField
    mField = CreateTextField(windowSize, mButtonLabel);
    mPopup = CreatePopup();
    mPopup.Add(mField);
    mPopup.OutsideTouchedSignal().Connect(this, &TextFieldExample::OnPopupOutsideTouched);
    window.Add(mPopup);
    mPopup.SetDisplayState(Popup::SHOWN);

    return true;
  }

  TextField CreateTextField(const Vector2& windowSize, const std::string& text)
  {
    TextField field = TextField::New();
    field.SetProperty(Dali::Actor::Property::NAME, "textField");
    field.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    field.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    field.SetResizePolicy(ResizePolicy::DIMENSION_DEPENDENCY, Dimension::HEIGHT);
    field.SetProperty(TextField::Property::TEXT, text);
    field.SetProperty(TextField::Property::TEXT_COLOR, Vector4(0.0f, 1.0f, 1.0f, 1.0f)); // CYAN
    field.SetProperty(TextField::Property::PLACEHOLDER_TEXT, "Unnamed folder");
    field.SetProperty(TextField::Property::PLACEHOLDER_TEXT_FOCUSED, "Enter folder name.");
    field.SetProperty(TextField::Property::DECORATION_BOUNDING_BOX, Rect<int>(BORDER_WIDTH, BORDER_WIDTH, windowSize.width - BORDER_WIDTH * 2, windowSize.height - BORDER_WIDTH * 2));

    return field;
  }

  Popup CreatePopup()
  {
    Popup popup = Popup::New();
    popup.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    popup.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
    popup.SetResizePolicy(ResizePolicy::FIT_TO_CHILDREN, Dimension::WIDTH);
    popup.SetResizePolicy(ResizePolicy::FIT_TO_CHILDREN, Dimension::HEIGHT);
    popup.TouchedSignal().Connect(this, &TextFieldExample::OnPopupTouched);

    return popup;
  }

  void OnPopupOutsideTouched()
  {
    // Update the folder text
    if(mButton && mField)
    {
      Property::Value text = mField.GetProperty(TextField::Property::TEXT);
      mButtonLabel         = text.Get<std::string>();
      mButton.SetProperty(Toolkit::Button::Property::LABEL, mButtonLabel);
    }

    // Hide & discard the pop-up
    if(mPopup)
    {
      mPopup.SetDisplayState(Popup::HIDDEN);
    }
    mField.Reset();
  }

  bool OnPopupTouched(Actor actor, const TouchEvent& event)
  {
    // End edit mode for TextField if parent Popup touched.
    if((event.GetPointCount() > 0) && (mPopup == event.GetHitActor(0)))
    {
      switch(event.GetState(0))
      {
        case PointState::DOWN:
        {
          // Update the folder text and lose focus for Key events
          if(mButton && mField)
          {
            Property::Value text = mField.GetProperty(TextField::Property::TEXT);
            mButtonLabel         = text.Get<std::string>();
            mButton.SetProperty(Toolkit::Button::Property::LABEL, mButtonLabel);
            mField.ClearKeyInputFocus();
          }
          break;
        }
        default:
        {
          break;
        }
      } // end switch
    }

    return false;
  }

  /**
   * 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;

  // This button launches a pop-up containing TextField
  PushButton  mButton;
  std::string mButtonLabel;

  // Pop-up contents
  TextField mField;
  Popup     mPopup;
};

int DALI_EXPORT_API main(int argc, char** argv)
{
  // DALI_DEMO_THEME_PATH not passed to Application so TextField example uses default Toolkit style sheet.
  Application      application = Application::New(&argc, &argv);
  TextFieldExample test(application);
  application.MainLoop();
  return 0;
}