text: /*
   * Copyright (c) 2019 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/dali.h>
  #include <dali-toolkit/dali-toolkit.h>
  #include <dali-toolkit/devel-api/builder/builder.h>
  #include <dali-toolkit/devel-api/builder/tree-node.h>
  #include <dali-toolkit/devel-api/builder/json-parser.h>
  #include <dali-toolkit/devel-api/controls/popup/popup.h>
  #include <dali-toolkit/devel-api/controls/navigation-view/navigation-view.h>
  
  #include <map>
  #include <string>
  #include <fstream>
  #include <streambuf>
  #include <sstream>
  #include <dirent.h>
  #include <stdio.h>
  #include <iostream>
  
  #include "sys/stat.h"
  #include <ctime>
  #include <cstring>
  
  #include <dali/integration-api/debug.h>
  #include <dali/devel-api/adaptor-framework/file-loader.h>
  #include "shared/view.h"
  
  #define TOKEN_STRING(x) #x
  
  using namespace Dali;
  using namespace Dali::Toolkit;
  
  namespace
  {
  
  const char* BACKGROUND_IMAGE( "" );
  const char* TOOLBAR_IMAGE( DEMO_IMAGE_DIR "top-bar.png" );
  const char* EDIT_IMAGE( DEMO_IMAGE_DIR "icon-change.png" );
  const char* EDIT_IMAGE_SELECTED( DEMO_IMAGE_DIR "icon-change-selected.png" );
  
  std::string USER_DIRECTORY;
  
  std::string JSON_BROKEN("                                      \
  {                                                              \
    'stage':                                                     \
    [                                                            \
      {                                                          \
        'type':'TextLabel',                                      \
        'size': [50,50,1],                                       \
        'parentOrigin': 'CENTER',                                \
        'text':'COULD NOT LOAD JSON FILE'                        \
      }                                                          \
    ]                                                            \
  }                                                              \
  ");
  
  std::string ReplaceQuotes(const std::string &single_quoted)
  {
    std::string s(single_quoted);
  
    // wrong as no embedded quote but had regex link problems
    std::replace(s.begin(), s.end(), '\'', '"');
  
    return s;
  }
  
  std::string GetFileContents(const std::string &fn)
  {
    std::streampos bufferSize = 0;
    Dali::Vector<char> fileBuffer;
    if( !Dali::FileLoader::ReadFile( fn, bufferSize, fileBuffer, FileLoader::FileType::BINARY ) )
    {
      return std::string();
    }
  
    return std::string( &fileBuffer[0], bufferSize );
  };
  
  typedef std::vector<std::string> FileList;
  
  void DirectoryFileList(const std::string& directory, FileList& files)
  {
    DIR           *d;
    struct dirent *dir;
    d = opendir(directory.c_str());
    if (d)
    {
      while ((dir = readdir(d)) != NULL)
      {
        if (dir->d_type == DT_REG)
        {
          files.push_back( directory + std::string(dir->d_name) );
        }
      }
  
      closedir(d);
    }
  }
  
  void DirectoryFilesByType(const std::string& dir, const std::string& fileType /* ie "json" */, FileList& files)
  {
    typedef FileList Collection;
    typedef FileList::iterator Iter;
  
    Collection allFiles;
    DirectoryFileList(dir, allFiles);
  
    for(Iter iter = allFiles.begin(); iter != allFiles.end(); ++iter)
    {
      size_t pos = (*iter).rfind( '.' );
      if( pos != std::string::npos )
      {
        if( (*iter).substr( pos+1 ) == fileType )
        {
          files.push_back( (*iter) );
        }
      }
    }
  }
  
  const std::string ShortName( const std::string& name )
  {
    size_t pos = name.rfind( '/' );
  
    if( pos != std::string::npos )
    {
      pos++;
      return name.substr( pos );
    }
    else
    {
      return name;
    }
  }
  
  //------------------------------------------------------------------------------
  //
  //
  //
  //------------------------------------------------------------------------------
  class FileWatcher
  {
  public:
    FileWatcher(void);
    ~FileWatcher(void);
    explicit FileWatcher(const std::string &fn) { SetFilename(fn) ; };
  
    void SetFilename(const std::string &fn);
    std::string GetFilename() const;
  
    bool FileHasChanged(void);
    std::string GetFileContents(void) const { return ::GetFileContents(mstringPath) ; };
  
  private:
    // compiler does
    // FileWatcher(const FileWatcher&);
    // FileWatcher &operator=(const FileWatcher &);
  
    std::time_t mLastTime;
    std::string mstringPath;
  
  };
  
  FileWatcher::FileWatcher(void) : mLastTime(0)
  {
  }
  
  bool FileWatcher::FileHasChanged(void)
  {
    struct stat buf;
  
    if(0 != stat(mstringPath.c_str(), &buf))
    {
      return false;
    }
    else
    {
      if(buf.st_mtime > mLastTime)
      {
        mLastTime = buf.st_mtime;
        return true;
      }
      else
      {
        mLastTime = buf.st_mtime;
        return false;
      }
    }
  
    return false;
  }
  
  FileWatcher::~FileWatcher()
  {
  }
  
  void FileWatcher::SetFilename(const std::string &fn)
  {
    mstringPath = fn;
    FileHasChanged(); // update last time
  }
  
  std::string FileWatcher::GetFilename(void) const
  {
    return mstringPath;
  }
  
  
  } // anon namespace
  
  
  //------------------------------------------------------------------------------
  //
  //
  //
  //------------------------------------------------------------------------------
  class ExampleApp : public ConnectionTracker, public Toolkit::ItemFactory
  {
  public:
    ExampleApp(Application &app) : mApp(app)
    {
      app.InitSignal().Connect(this, &ExampleApp::Create);
    }
  
    ~ExampleApp() {}
  
  public:
  
    void SetTitle(const std::string& title)
    {
      if(!mTitleActor)
      {
        mTitleActor = DemoHelper::CreateToolBarLabel( "" );
        // Add title to the tool bar.
        mToolBar.AddControl( mTitleActor, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarTitlePercentage, Alignment::HorizontalCenter );
      }
  
      mTitleActor.SetProperty( TextLabel::Property::TEXT, title );
    }
  
    bool OnBackButtonPressed( Toolkit::Button button )
    {
      OnQuitOrBack();
      return true;
    }
  
    void SetUpItemView()
    {
      Stage stage = Stage::GetCurrent();
  
      mTapDetector = TapGestureDetector::New();
      mTapDetector.DetectedSignal().Connect( this, &ExampleApp::OnTap );
  
      mFiles.clear();
  
      mItemView = ItemView::New(*this);
  
      mItemView.SetParentOrigin(ParentOrigin::CENTER);
      mItemView.SetAnchorPoint(AnchorPoint::CENTER);
      mLayout = DefaultItemLayout::New( DefaultItemLayout::LIST );
  
      mLayout->SetItemSize( Vector3( stage.GetSize().width, 50, 1 ) );
  
      mItemView.AddLayout( *mLayout );
  
      mItemView.SetKeyboardFocusable( true );
  
      mFiles.clear();
      FileList files;
  
      if( USER_DIRECTORY.size() )
      {
        DirectoryFilesByType( USER_DIRECTORY, "json", files );
      }
      else
      {
        DirectoryFilesByType( DEMO_SCRIPT_DIR, "json", files );
      }
  
      std::sort(files.begin(), files.end());
  
      ItemId itemId = 0;
      for(FileList::iterator iter = files.begin(); iter != files.end(); ++iter)
      {
        JsonParser parser = JsonParser::New();
  
        std::string data( GetFileContents( *iter ) );
  
        parser.Parse( data );
  
        if( parser.ParseError() )
        {
          std::cout << "Parser Error:" << *iter << std::endl;
          std::cout << parser.GetErrorLineNumber() << "(" << parser.GetErrorColumn() << "):" << parser.GetErrorDescription() << std::endl;
          exit(1);
        }
  
        if( parser.GetRoot() )
        {
          if( const TreeNode* node = parser.GetRoot()->Find("stage") )
          {
            // only those with a stage section
            if( node->Size() )
            {
              mFiles.push_back( *iter );
  
              mItemView.InsertItem( Item(itemId,
                                         MenuItem( ShortName( *iter ) ) ),
                                    0.5f );
  
              itemId++;
            }
            else
            {
              std::cout << "Ignored file (stage has no nodes?):" << *iter << std::endl;
            }
          }
          else
          {
            std::cout << "Ignored file (no stage section):" << *iter << std::endl;
          }
        }
      }
  
      // Activate the layout
      Vector3 size(stage.GetSize());
      mItemView.ActivateLayout(0, size, 0.0f/*immediate*/);
    }
  
  
    void OnTap( Actor actor, const TapGesture& tap )
    {
      ItemId id = mItemView.GetItemId( actor );
  
      LoadFromFileList( id );
    }
  
    Actor MenuItem(const std::string& text)
    {
      TextLabel label = TextLabel::New( ShortName( text ) );
      label.SetStyleName( "BuilderLabel" );
      label.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH );
  
      // Hook up tap detector
      mTapDetector.Attach( label );
  
      return label;
    }
  
    bool OnTimer()
    {
      if( mFileWatcher.FileHasChanged() )
      {
        LoadFromFile( mFileWatcher.GetFilename() );
      }
  
      return true;
    }
  
    void ReloadJsonFile(const std::string& filename, Builder& builder, Layer& layer)
    {
      Stage stage = Stage::GetCurrent();
  
      builder = Builder::New();
      builder.QuitSignal().Connect( this, &ExampleApp::OnQuitOrBack );
  
      Property::Map defaultDirs;
      defaultDirs[ TOKEN_STRING(DEMO_IMAGE_DIR) ]  = DEMO_IMAGE_DIR;
      defaultDirs[ TOKEN_STRING(DEMO_MODEL_DIR) ]  = DEMO_MODEL_DIR;
      defaultDirs[ TOKEN_STRING(DEMO_SCRIPT_DIR) ] = DEMO_SCRIPT_DIR;
  
      builder.AddConstants( defaultDirs );
  
      // render tasks may have been setup last load so remove them
      RenderTaskList taskList = stage.GetRenderTaskList();
      if( taskList.GetTaskCount() > 1 )
      {
        typedef std::vector<RenderTask> Collection;
        typedef Collection::iterator ColIter;
        Collection tasks;
  
        for(unsigned int i = 1; i < taskList.GetTaskCount(); ++i)
        {
          tasks.push_back( taskList.GetTask(i) );
        }
  
        for(ColIter iter = tasks.begin(); iter != tasks.end(); ++iter)
        {
          taskList.RemoveTask(*iter);
        }
  
        RenderTask defaultTask = taskList.GetTask(0);
        defaultTask.SetSourceActor( stage.GetRootLayer() );
        defaultTask.SetTargetFrameBuffer( FrameBufferImage() );
      }
  
      unsigned int numChildren = layer.GetChildCount();
  
      for(unsigned int i=0; i<numChildren; ++i)
      {
        layer.Remove( layer.GetChildAt(0) );
      }
  
      std::string data(GetFileContents(filename));
  
      try
      {
        builder.LoadFromString(data);
      }
      catch(...)
      {
        builder.LoadFromString(ReplaceQuotes(JSON_BROKEN));
      }
  
      builder.AddActors( layer );
    }
  
  
    void LoadFromFileList( size_t index )
    {
      if( index < mFiles.size())
      {
        const std::string& name = mFiles[index];
        mFileWatcher.SetFilename( name );
        LoadFromFile( name );
      }
    }
  
    void LoadFromFile( const std::string& name )
    {
      ReloadJsonFile( name, mBuilder, mBuilderLayer );
  
      mBuilderLayer.SetParentOrigin(ParentOrigin::BOTTOM_CENTER);
      mBuilderLayer.SetAnchorPoint(AnchorPoint::BOTTOM_CENTER);
      Dali::Vector3 size = Stage::GetCurrent().GetRootLayer().GetCurrentSize();
      size.y -= DemoHelper::DEFAULT_VIEW_STYLE.mToolBarHeight;
      mBuilderLayer.SetSize( size );
  
      mNavigationView.Push( mBuilderLayer );
    }
  
    void Create(Application& app)
    {
      Stage stage = Stage::GetCurrent();
  
      Stage::GetCurrent().KeyEventSignal().Connect(this, &ExampleApp::OnKeyEvent);
  
      Layer contents = DemoHelper::CreateView( app,
                                               mView,
                                               mToolBar,
                                               BACKGROUND_IMAGE,
                                               TOOLBAR_IMAGE,
                                               "" );
  
      SetTitle("Select Example");
  
      mBuilderLayer = Layer::New();
  
      // Create an edit mode button. (left of toolbar)
      Toolkit::PushButton backButton = Toolkit::PushButton::New();
      backButton.SetProperty( Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, EDIT_IMAGE );
      backButton.SetProperty( Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, EDIT_IMAGE_SELECTED );
      backButton.ClickedSignal().Connect( this, &ExampleApp::OnBackButtonPressed);
      backButton.SetLeaveRequired( true );
      mToolBar.AddControl( backButton, DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage, Toolkit::Alignment::HorizontalLeft, DemoHelper::DEFAULT_MODE_SWITCH_PADDING  );
  
      mNavigationView = Toolkit::NavigationView::New();
      mNavigationView.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
      mNavigationView.SetAnchorPoint( AnchorPoint::TOP_LEFT);
  
      stage.Add( mNavigationView );
  
      // Set up the background gradient.
      Property::Array stopOffsets;
      stopOffsets.PushBack( 0.0f );
      stopOffsets.PushBack( 1.0f );
      Property::Array stopColors;
      stopColors.PushBack( Color::WHITE );
      stopColors.PushBack( Vector4( 0.45f, 0.70f, 0.80f, 1.0f ) ); // Medium bright, pastel blue
      const float percentageStageHeight = stage.GetSize().height * 0.6f;
  
      mNavigationView.SetProperty( Toolkit::Control::Property::BACKGROUND, Dali::Property::Map()
        .Add( Toolkit::Visual::Property::TYPE, Dali::Toolkit::Visual::GRADIENT )
        .Add( Toolkit::GradientVisual::Property::STOP_OFFSET, stopOffsets )
        .Add( Toolkit::GradientVisual::Property::STOP_COLOR, stopColors )
        .Add( Toolkit::GradientVisual::Property::START_POSITION, Vector2( 0.0f, -percentageStageHeight ) )
        .Add( Toolkit::GradientVisual::Property::END_POSITION, Vector2( 0.0f, percentageStageHeight ) )
        .Add( Toolkit::GradientVisual::Property::UNITS, Toolkit::GradientVisual::Units::USER_SPACE ) );
  
      SetUpItemView();
      mNavigationView.Push( mItemView );
  
      mTimer = Timer::New( 500 ); // ms
      mTimer.TickSignal().Connect( this, &ExampleApp::OnTimer);
      mTimer.Start();
  
    } // Create(app)
  
    virtual unsigned int GetNumberOfItems()
    {
      return mFiles.size();
    }
  
    virtual Actor NewItem(unsigned int itemId)
    {
      DALI_ASSERT_DEBUG( itemId < mFiles.size() );
      return MenuItem( ShortName( mFiles[itemId] ) );
    }
  
    /**
     * Main key event handler
     */
    void OnKeyEvent(const KeyEvent& event)
    {
      if(event.state == KeyEvent::Down)
      {
        if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
        {
          OnQuitOrBack();
        }
      }
    }
  
    /**
     * Event handler when Builder wants to quit (we only want to close the shown json unless we're at the top-level)
     */
    void OnQuitOrBack()
    {
      if ( mItemView.OnStage() )
      {
        mApp.Quit();
      }
      else
      {
        mNavigationView.Pop();
      }
    }
  
  private:
    Application& mApp;
  
    ItemLayoutPtr mLayout;
    ItemView mItemView;
    Toolkit::NavigationView mNavigationView;
  
    Toolkit::Control mView;
  
    Toolkit::ToolBar mToolBar;
    TextLabel mTitleActor;
  
    Layer mBuilderLayer;
  
    TapGestureDetector mTapDetector;
  
    // builder
    Builder mBuilder;
  
    FileList mFiles;
  
    FileWatcher mFileWatcher;
    Timer mTimer;
  };
  
  //------------------------------------------------------------------------------
  //
  //
  //
  //------------------------------------------------------------------------------
  int DALI_EXPORT_API main(int argc, char **argv)
  {
    if(argc > 2)
    {
      if(strcmp(argv[1], "-f") == 0)
      {
        USER_DIRECTORY = argv[2];
      }
    }
  
    Application app = Application::New(&argc, &argv, DEMO_THEME_PATH);
  
    ExampleApp dali_app(app);
  
    app.MainLoop();
  
    return 0;
  }
  