// -*- C++ -*-
//
// This file is part of the Coriolis Software.
// Copyright (c) UPMC/LIP6 2008-2018, All Rights Reserved
//
// +-----------------------------------------------------------------+ 
// |                  H U R R I C A N E                              |
// |     V L S I   B a c k e n d   D a t a - B a s e                 |
// |                                                                 |
// |  Author      :                    Jean-Paul CHAPUT              |
// |  E-mail      :       Jean-Paul.Chaput@asim.lip6.fr              |
// | =============================================================== |
// |  C++ Module  :       "./NetlistWidget.cpp"                      |
// +-----------------------------------------------------------------+


#include <QFontMetrics>
#include <QLabel>
#include <QLineEdit>
#include <QHeaderView>
#include <QKeyEvent>
#include <QGroupBox>
#include <QVBoxLayout>
#include <QAction>
#include <QModelIndex>
#include "hurricane/Commons.h"
#include "hurricane/Net.h"
#include "hurricane/viewer/Graphics.h"
#include "hurricane/viewer/NetlistModel.h"
#include "hurricane/viewer/NetlistWidget.h"


namespace {

  using namespace Hurricane;


} // End of anonymous namespace.


namespace Hurricane {


  NetlistWidget::NetlistWidget ( QWidget* parent )
    : QWidget       (parent)
    , _cellWidget   (NULL)
    , _cell         (NULL)
    , _baseModel    (new NetlistModel(this))
    , _sortModel    (new QSortFilterProxyModel(this))
    , _view         (new QTableView(this))
    , _rowHeight    (20)
    , _selecteds    ()
    , _forceReselect(false)
  {
    setAttribute ( Qt::WA_DeleteOnClose );
    setAttribute ( Qt::WA_QuitOnClose, false );
    setContextMenuPolicy ( Qt::ActionsContextMenu );

    _rowHeight = QFontMetrics(Graphics::getFixedFont()).height() + 4;

    _sortModel->setSourceModel      ( _baseModel );
    _sortModel->setDynamicSortFilter( true );
    _sortModel->setFilterKeyColumn  ( 0 );

    _view->setShowGrid            ( false );
    _view->setAlternatingRowColors( true );
    _view->setSelectionBehavior   ( QAbstractItemView::SelectRows );
    _view->setSortingEnabled      ( true );
    _view->setModel               ( _sortModel );

    QHeaderView* horizontalHeader = _view->horizontalHeader();
    horizontalHeader->setDefaultAlignment  ( Qt::AlignHCenter );
    horizontalHeader->setMinimumSectionSize( (Graphics::isHighDpi()) ? 300 : 150 );
    horizontalHeader->setStretchLastSection( true );

    QHeaderView* verticalHeader = _view->verticalHeader();
    verticalHeader->setVisible( false );
    verticalHeader->setDefaultSectionSize( _rowHeight );

    // verticalHeader->setStyleSheet( "QHeaderView::section {"
    //                                  "padding-bottom: 0px;"
    //                                  "padding-top:    0px;"
    //                                  "padding-left:   0px;"
    //                                  "padding-right:  1px;"
    //                                  "margin:         0px;"
    //                                "}"
    //                              );

    _filterPatternLineEdit = new QLineEdit( this );
    QLabel* filterPatternLabel = new QLabel( tr("&Filter pattern:"), this );
    filterPatternLabel->setBuddy( _filterPatternLineEdit );

    QGridLayout* gLayout = new QGridLayout();
    gLayout->addWidget( _view                 , 1, 0, 1, 2 );
    gLayout->addWidget( filterPatternLabel    , 2, 0 );
    gLayout->addWidget( _filterPatternLineEdit, 2, 1 );

    setLayout( gLayout );

    QAction* fitAction = new QAction( tr("&Fit to Net"), this );
    fitAction->setShortcut ( QKeySequence(tr("CTRL+F")) );
    fitAction->setStatusTip( tr("Fit the view to the Net's bounding box") );
    addAction( fitAction );

    connect( _filterPatternLineEdit , SIGNAL(textChanged(const QString &))
           , this                   , SLOT  (textFilterChanged()) );                       
    connect( _view->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&,const QItemSelection&))
           , this                   , SLOT  (updateSelecteds (const QItemSelection&,const QItemSelection&)) );
    connect( fitAction , SIGNAL(triggered    ()), this, SLOT(fitToNet      ()) );

    resize( 300, 300 );
  }


  void  NetlistWidget::goTo ( int delta )
  {
    if ( delta == 0 ) return;

    QModelIndex newIndex = _sortModel->index ( _view->currentIndex().row()+delta, 0, QModelIndex() );

    if ( newIndex.isValid() )
      _view->selectRow ( newIndex.row() );
  }


  void  NetlistWidget::updateSelecteds ()
  {
    _forceReselect = true;

    QItemSelection  dummy;
    updateSelecteds ( dummy, dummy );
  }


  void  NetlistWidget::updateSelecteds ( const QItemSelection& , const QItemSelection& )
  {
    if ( _cellWidget ) _cellWidget->openRefreshSession ();

    _selecteds.resetAccesses ();

    const Net* net;
    QModelIndexList iList = _view->selectionModel()->selectedRows();
    for ( int i=0 ; i<iList.size() ; i++ ) {
      net = _baseModel->getNet ( _sortModel->mapToSource(iList[i]).row() );
      if ( net )
        _selecteds.insert ( net );
    }

    if ( _forceReselect ) {
      _selecteds.forceInserteds();
      _forceReselect = false;
    }

    SelectedNetSet::iterator remove;
    SelectedNetSet::iterator isel  = _selecteds.begin ();
    while ( isel != _selecteds.end() ) {
      switch ( isel->getAccesses() ) {
        case 1:  break;
        case 64:
          emit netSelected ( Occurrence(isel->getNet()) );
          break;
        case 0:
          emit netUnselected ( Occurrence(isel->getNet()) );
          remove = isel;
          ++isel;
          _selecteds.erase ( remove );
          continue;
        default:
          cerr << Bug("NetlistWidget::updateSelecteds(): invalid code %d"
                     ,isel->getAccesses()) << endl;
      }
      ++isel;
    }

    if ( _cellWidget ) _cellWidget->closeRefreshSession ();
  }


  void  NetlistWidget::textFilterChanged ()
  {
    _sortModel->setFilterRegExp( _filterPatternLineEdit->text() );
  //updateSelecteds ();
  }


  void  NetlistWidget::fitToNet ()
  {
    const Net* net = _baseModel->getNet ( _sortModel->mapToSource(_view->currentIndex()).row() );

    if ( net ) emit netFitted ( net );
  }


} // End of Hurricane namespace.