#include "App_cpPipelineEditor.h"
#include "ui_App_cpPipelineEditor.h"

#include <cpPipelineEditor/Editor.h>

#include <QFileDialog>
#include <QMessageBox>

#include <vtkImageData.h>
#include <vtkPolyData.h>

#include <cpPlugins/Interface/Workspace.h>
#include <cpPlugins/Interface/DataObject.h>

// -------------------------------------------------------------------------
#define App_cpPipelineEditor_ConnectAction( ACTION )    \
  this->connect(                                        \
    this->m_UI->Action##ACTION, SIGNAL( triggered( ) ), \
    this, SLOT( _Action##ACTION( ) )                    \
    )

// -------------------------------------------------------------------------
#define App_cpPipelineEditor_ConnectButton( BUTTON )    \
  this->connect(                                        \
    this->m_UI->Button##BUTTON, SIGNAL( clicked( ) ),   \
    this, SLOT( _Button##BUTTON( ) )                    \
    )

// -------------------------------------------------------------------------
App_cpPipelineEditor::
App_cpPipelineEditor( int argc, char* argv[], QWidget* parent )
  : QMainWindow( parent ),
    m_UI( new Ui::App_cpPipelineEditor ),
    m_Workspace( NULL ),
    m_PluginsPath( "." )
{
  this->m_UI->setupUi( this );

  // Prepare plugins interface
  this->m_Plugins = new cpPlugins::Interface::Interface( );
  QFileInfo info( argv[ 0 ] );
  if( info.exists( ) )
  {
    this->m_PluginsPath = info.canonicalPath( ).toStdString( );
    if( !( this->m_Plugins->LoadDefaultConfiguration( this->m_PluginsPath ) ) )
      if( this->m_Plugins->LoadFromFolder( this->m_PluginsPath, false ) )
        if( !( this->m_Plugins->SaveDefaultConfiguration( this->m_PluginsPath ) ) )
          QMessageBox::critical(
            this,
            "Error creating default plugins configuration",
            "Could not save default plugins configuration"
            );
    this->_UpdateLoadedPlugins( );

  } // fi

  // Create an empty workspace
  this->m_Workspace = new cpPlugins::Interface::Workspace( );
  this->m_Workspace->SetPlugins( this->m_Plugins );
  this->m_UI->Canvas->editor( )->setWorkspace( this->m_Workspace );
  this->m_Workspace->SetMPRViewer( this->m_UI->Viewer );

  // Connect actions to slots
  App_cpPipelineEditor_ConnectButton( LoadPluginsFile );
  App_cpPipelineEditor_ConnectButton( LoadPluginsPath );
  App_cpPipelineEditor_ConnectAction( OpenWorkspace );
  App_cpPipelineEditor_ConnectAction( SaveWorkspace );
  this->connect(
    this->m_UI->Canvas->editor( ),
    SIGNAL( execFilter( const std::string& ) ),
    this,
    SLOT( _ExecFilter( const std::string& ) )
    );
  this->connect(
    this->m_UI->Canvas->editor( ),
    SIGNAL( showFilterOutput( const std::string&, const std::string& ) ),
    this,
    SLOT( _ShowFilterOutput( const std::string&, const std::string& ) )
    );
}

// -------------------------------------------------------------------------
App_cpPipelineEditor::
~App_cpPipelineEditor( )
{
  delete this->m_UI;
  if( this->m_Workspace != NULL )
    delete this->m_Workspace;
  delete this->m_Plugins;
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_UpdateLoadedPlugins( )
{
  auto& classes = this->m_Plugins->GetClasses( );

  if( classes.size( ) == 0 )
  {
    QMessageBox::critical(
      this,
      "Error loading default plugins",
      "No plugins loaded: remember to load some!!!"
      );
    return;

  } // fi

  auto catIt = classes.begin( );
  for( ; catIt != classes.end( ); ++catIt )
  {
    // Create or get category
    QList< QTreeWidgetItem* > cat_items =
      this->m_UI->LoadedPlugins->findItems(
        catIt->first.c_str( ), Qt::MatchExactly | Qt::MatchRecursive
        );
    QTreeWidgetItem* cat = NULL;
    if( cat_items.size( ) == 0 )
    {
      cat = new QTreeWidgetItem(
        ( QTreeWidgetItem* )( NULL ), QStringList( catIt->first.c_str( ) )
        );
      this->m_UI->LoadedPlugins->addTopLevelItem( cat );
    }
    else
      cat = cat_items[ 0 ];

    // Create filters
    auto fIt = catIt->second.begin( );
    for( ; fIt != catIt->second.end( ); ++fIt )
    {
      QList< QTreeWidgetItem* > filter_items =
        this->m_UI->LoadedPlugins->findItems(
          fIt->first.c_str( ), Qt::MatchExactly | Qt::MatchRecursive
          );
      auto fiIt = filter_items.begin( );
      auto found_fiIt = filter_items.end( );
      for( ; fiIt != filter_items.end( ); ++fiIt )
        if( ( *fiIt )->parent( ) == cat )
          found_fiIt = fiIt;

      // Add filter
      if( found_fiIt == filter_items.end( ) )
        QTreeWidgetItem* filter = new QTreeWidgetItem(
          cat, QStringList( fIt->first.c_str( ) )
          );
    } // rof

  } // rof
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ButtonLoadPluginsFile( )
{
  QFileDialog dlg( this );
  dlg.setFileMode( QFileDialog::ExistingFiles );
  dlg.setDirectory( "." );

  std::stringstream name_filter;
  std::string suffix = std::string( PLUGIN_EXT ).substr( 1 );

  name_filter << "Plugins file (*" << PLUGIN_EXT << ");;All files (*)";
  dlg.setNameFilter( name_filter.str( ).c_str( ) );
  dlg.setDefaultSuffix( suffix.c_str( ) );

  if( !( dlg.exec( ) ) )
    return;

  // Read
  QStringList names = dlg.selectedFiles( );
  std::stringstream err_str;
  for( auto qIt = names.begin( ); qIt != names.end( ); ++qIt )
    if( !( this->m_Plugins->Load( qIt->toStdString( ) ) ) )
      err_str << qIt->toStdString( ) << std::endl;

  // Show an error message
  std::string err = err_str.str( );
  if( err.size( ) > 0 )
    QMessageBox::critical(
      this,
      "Error loading plugins",
      err.c_str( )
      );

  // Update view
  this->m_Plugins->SaveDefaultConfiguration( this->m_PluginsPath );
  this->_UpdateLoadedPlugins( );
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ButtonLoadPluginsPath( )
{
  QFileDialog dlg( this );
  dlg.setFileMode( QFileDialog::DirectoryOnly );
  dlg.setDirectory( "." );
  if( !( dlg.exec( ) ) )
    return;

  // Read
  std::string dir = dlg.selectedFiles( ).begin( )->toStdString( );
  if( !( this->m_Plugins->LoadFromFolder( dir, false ) ) )
    QMessageBox::critical(
      this,
      "Error loading plugins directory",
      dir.c_str( )
      );

  // Update view
  this->m_Plugins->SaveDefaultConfiguration( this->m_PluginsPath );
  this->_UpdateLoadedPlugins( );
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ActionOpenWorkspace( )
{
  QFileDialog dlg( this );
  dlg.setFileMode( QFileDialog::ExistingFile );
  dlg.setDirectory( "." );
  dlg.setNameFilter(
    QFileDialog::tr( "Workspace file (*.xml);;All files (*)" )
    );
  dlg.setDefaultSuffix( QFileDialog::tr( "xml" ) );
  if( !( dlg.exec( ) ) )
    return;
  std::string fname = dlg.selectedFiles( ).at( 0 ).toStdString( );

  if( this->m_Workspace != NULL )
    delete this->m_Workspace;
  this->m_Workspace = new cpPlugins::Interface::Workspace( );
  this->m_Workspace->SetPlugins( this->m_Plugins );
  this->m_Workspace->SetMPRViewer( this->m_UI->Viewer );
  std::string err = this->m_Workspace->LoadWorkspace( fname );
  if( err != "" )
  {
    delete this->m_Workspace;
    this->m_Workspace = NULL;
    QMessageBox::critical(
      this,
      QMessageBox::tr( "Error loading workspace" ),
      QMessageBox::tr( err.c_str( ) )
      );
  }
  else
    this->m_UI->Canvas->editor( )->setWorkspace( this->m_Workspace );
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ActionSaveWorkspace( )
{
  if( this->m_Workspace == NULL )
    return;

  QFileDialog dlg( this );
  dlg.setFileMode( QFileDialog::AnyFile );
  dlg.setDirectory( "." );
  dlg.setAcceptMode( QFileDialog::AcceptSave );
  dlg.setNameFilter(
    QFileDialog::tr( "Workspace file (*.xml);;All files (*)" )
    );
  dlg.setDefaultSuffix( QFileDialog::tr( "xml" ) );
  if( !( dlg.exec( ) ) )
    return;
  std::string fname = dlg.selectedFiles( ).at( 0 ).toStdString( );

  std::string err = this->m_Workspace->SaveWorkspace( fname );
  if( err != "" )
    QMessageBox::critical(
      this,
      QMessageBox::tr( "Error saving workspace" ),
      QMessageBox::tr( err.c_str( ) )
      );
}


// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ExecFilter( const std::string& filter_name )
{
  if( this->m_Workspace != NULL )
  {
    // Update filter, if needed
    std::string err = this->m_Workspace->Execute( filter_name );
    if( err != "" )
      QMessageBox::critical(
        this,
        QMessageBox::tr( "Error executing filter" ),
        QMessageBox::tr( err.c_str( ) )
        );

  } // fi
}

// -------------------------------------------------------------------------
void App_cpPipelineEditor::
_ShowFilterOutput(
  const std::string& filter_name, const std::string& output_name
  )
{
  typedef cpPlugins::Interface::DataObject _TDataObject;

  // Update filter, if needed
  this->_ExecFilter( filter_name );

  // Get output
  auto filter = this->m_Workspace->GetFilter( filter_name );
  if( filter != NULL )
  {
    auto output = filter->GetOutputData( output_name );
    if( output != NULL )
    {
      std::string data_name = output_name + "@" + filter_name;
      if( this->m_UI->Viewer->AddData( output, data_name, "" ) )
      {
        if( this->m_UI->Viewer->GetNumberOfData( ) > 1 )
          this->m_UI->Viewer->SetDataColor( data_name, 1, 0, 0 );
        else
          this->m_UI->Viewer->SetMainImage( data_name );
        this->m_UI->Viewer->ShowData( data_name );
      }
      else
        QMessageBox::critical(
          this,
          QMessageBox::tr( "Error showing data" ),
          QMessageBox::tr( "No known VTK conversion!" )
          );

    } // fi

  } // fi
}

// eof - $RCSfile$