/*
  This file is part of KOrganizer.

  Copyright (c) 2004 Tobias Koenig <tokoe@kde.org>
  Copyright (c) 2004 Cornelius Schumacher <schumacher@kde.org>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
*/

#include "kcmdesignerfields.h"

#include <KAboutData>
#include <KDebug>
#include <KDirWatch>
#include <KFileDialog>
#include <KMessageBox>
#include <KRun>
#include <KShell>
#include <KStandardDirs>
#include <KIO/Job>
#include <KIO/NetAccess>

#include <QGroupBox>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QLabel>
#include <QPushButton>
#include <QTreeWidget>
#include <QUiLoader>
#include <QWhatsThis>

class PageItem : public QTreeWidgetItem
{
  public:
    PageItem( QTreeWidget *parent, const QString &path )
      : QTreeWidgetItem( parent ),
        mPath( path ), mIsActive( false )
    {
      setFlags( flags() | Qt::ItemIsUserCheckable );
      setCheckState( 0, Qt::Unchecked );
      mName = path.mid( path.lastIndexOf( QLatin1Char('/') ) + 1 );

      QFile f( mPath );
      if (!f.open( QFile::ReadOnly ) ) 
         return;
      QUiLoader builder;
      QWidget *wdg = builder.load( &f, 0 );
      f.close();
      if ( wdg ) {
        setText( 0, wdg->windowTitle() );

        QPixmap pm = QPixmap::grabWidget( wdg );
        QImage img = pm.toImage().scaled( 300, 300, Qt::KeepAspectRatio, Qt::SmoothTransformation );
        mPreview = QPixmap::fromImage(img);

        QMap<QString, QString> allowedTypes;
        allowedTypes.insert( QLatin1String("QLineEdit"), i18n( "Text" ) );
        allowedTypes.insert( QLatin1String("QTextEdit"), i18n( "Text" ) );
        allowedTypes.insert( QLatin1String("QSpinBox"), i18n( "Numeric Value" ) );
        allowedTypes.insert( QLatin1String("QCheckBox"), i18n( "Boolean" ) );
        allowedTypes.insert( QLatin1String("QComboBox"), i18n( "Selection" ) );
        allowedTypes.insert( QLatin1String("QDateTimeEdit"), i18n( "Date & Time" ) );
        allowedTypes.insert( QLatin1String("KLineEdit"), i18n( "Text" ) );
        allowedTypes.insert( QLatin1String("KTextEdit"), i18n( "Text" ) );
        allowedTypes.insert( QLatin1String("KDateTimeWidget"), i18n( "Date & Time" ) );
        allowedTypes.insert( QLatin1String("KDatePicker"), i18n( "Date" ) );

        QList<QWidget*> list = wdg->findChildren<QWidget*>();
        QWidget *it;
        Q_FOREACH ( it, list ) {
          if ( allowedTypes.contains( QLatin1String(it->metaObject()->className()) ) ) {
            QString name = it->objectName();
            if ( name.startsWith( QLatin1String( "X_" ) ) ) {
              new QTreeWidgetItem( this, QStringList()
                << name
                << allowedTypes[ QLatin1String(it->metaObject()->className()) ]
                << QLatin1String(it->metaObject()->className())
                << it->whatsThis() );
            }
          }
        }

      }
    }

    QString name() const
    {
      return mName;
    }

    QString path() const
    {
      return mPath;
    }

    QPixmap preview()
    {
      return mPreview;
    }

    void setIsActive( bool isActive )
    {
      mIsActive = isActive;
    }

    bool isActive() const
    {
      return mIsActive;
    }

    bool isOn() const
    {
      return checkState( 0 ) == Qt::Checked;
    }

  private:
    QString mName;
    QString mPath;
    QPixmap mPreview;
    bool mIsActive;
};

KCMDesignerFields::KCMDesignerFields( const KComponentData &instance, QWidget *parent,
                                      const QVariantList &args )
  : KCModule( instance, parent, args ),
    mPageView( 0 ),
    mPagePreview( 0 ),
    mPageDetails( 0 ),
    mDeleteButton( 0 ),
    mImportButton( 0 ),
    mDesignerButton( 0 )
{
  KAboutData *about = new KAboutData( I18N_NOOP( "KCMDesignerfields" ), 0,
                                      ki18n( "Qt Designer Fields Dialog" ),
                                      0, KLocalizedString(), KAboutData::License_LGPL,
                                      ki18n( "(c), 2004 Tobias Koenig" ) );

  about->addAuthor( ki18n( "Tobias Koenig" ), KLocalizedString(), "tokoe@kde.org" );
  about->addAuthor( ki18n( "Cornelius Schumacher" ), KLocalizedString(), "schumacher@kde.org" );
  setAboutData( about );
}

void KCMDesignerFields::delayedInit()
{
  kDebug() << "KCMDesignerFields::delayedInit()";

  initGUI();

  connect( mPageView, SIGNAL(itemSelectionChanged()),
           this, SLOT(updatePreview()) );
  connect( mPageView, SIGNAL(itemClicked(QTreeWidgetItem*,int)),
           this, SLOT(itemClicked(QTreeWidgetItem*)) );

  connect( mDeleteButton, SIGNAL(clicked()),
           this, SLOT(deleteFile()) );
  connect( mImportButton, SIGNAL(clicked()),
           this, SLOT(importFile()) );
  connect( mDesignerButton, SIGNAL(clicked()),
           this, SLOT(startDesigner()) );

  load();

  // Install a dirwatcher that will detect newly created or removed designer files
  KDirWatch *dw = new KDirWatch( this );
  KStandardDirs::makeDir( localUiDir() );
  dw->addDir( localUiDir(), KDirWatch::WatchFiles );
  connect( dw, SIGNAL(created(QString)), SLOT(rebuildList()) );
  connect( dw, SIGNAL(deleted(QString)), SLOT(rebuildList()) );
  connect( dw, SIGNAL(dirty(QString)), SLOT(rebuildList()) );
}

void KCMDesignerFields::deleteFile()
{
  foreach ( QTreeWidgetItem *item, mPageView->selectedItems() ) {
    PageItem *pageItem = static_cast<PageItem*>( item->parent() ? item->parent() : item );
    if ( KMessageBox::warningContinueCancel(
           this,
           i18n( "<qt>Do you really want to delete '<b>%1</b>'?</qt>",
                 pageItem->text(0) ), QString(), KStandardGuiItem::del() ) == KMessageBox::Continue ) {
      KIO::NetAccess::del( pageItem->path(), 0 );
    }
  }
  // The actual view refresh will be done automagically by the slots connected to kdirwatch
}

void KCMDesignerFields::importFile()
{
  KUrl src = KFileDialog::getOpenFileName( QDir::homePath(),
                                           i18n( "*.ui|Designer Files" ),
                                           this, i18n( "Import Page" ) );
  KUrl dest = localUiDir();
  QDir().mkpath( localUiDir() );
  dest.setFileName( src.fileName() );
  KIO::Job *job = KIO::file_copy( src, dest, -1, KIO::Overwrite );
  KIO::NetAccess::synchronousRun( job, this );

  // The actual view refresh will be done automagically by the slots connected to kdirwatch
}

void KCMDesignerFields::loadUiFiles()
{
  const QStringList list = KGlobal::dirs()->findAllResources( "data", uiPath() + QLatin1String("/*.ui"),
                                                        KStandardDirs::Recursive |
                                                        KStandardDirs::NoDuplicates );
  for ( QStringList::ConstIterator it = list.constBegin(); it != list.constEnd(); ++it ) {
    new PageItem( mPageView, *it );
  }
}

void KCMDesignerFields::rebuildList()
{
  // If nothing is initialized there is no need to do something
  if ( mPageView ) {
    QStringList ai = saveActivePages();
    updatePreview();
    mPageView->clear();
    loadUiFiles();
    loadActivePages(ai);
  }
}

void KCMDesignerFields::loadActivePages( const QStringList &ai )
{
  QTreeWidgetItemIterator it( mPageView );
  while ( *it ) {
    if ( (*it)->parent() == 0 ) {
      PageItem *item = static_cast<PageItem*>( *it );
      if ( ai.contains( item->name() ) ) {
        item->setCheckState( 0, Qt::Checked );
        item->setIsActive( true );
      }
    }

    ++it;
  }
}

void KCMDesignerFields::load()
{
  // see KCModule::showEvent()
  if ( !mPageView ) {
    delayedInit();
  }
  loadActivePages( readActivePages() );
}

QStringList KCMDesignerFields::saveActivePages()
{
  QTreeWidgetItemIterator it( mPageView, QTreeWidgetItemIterator::Checked |
                              QTreeWidgetItemIterator::Selectable );

  QStringList activePages;
  while ( *it ) {
    if ( (*it)->parent() == 0 ) {
      PageItem *item = static_cast<PageItem*>( *it );
      activePages.append( item->name() );
    }

    ++it;
  }

  return activePages;
}

void KCMDesignerFields::save()
{
  writeActivePages( saveActivePages() );
}

void KCMDesignerFields::defaults()
{
}

void KCMDesignerFields::initGUI()
{
  QVBoxLayout *layout = new QVBoxLayout( this );
  layout->setSpacing( KDialog::spacingHint() );
  layout->setMargin( KDialog::marginHint() );

  bool noDesigner = KStandardDirs::findExe( QLatin1String("designer") ).isEmpty();

  if ( noDesigner ) {
    QString txt =
      i18n( "<qt><b>Warning:</b> Qt Designer could not be found. It is probably not "
            "installed. You will only be able to import existing designer files.</qt>" );
    QLabel *lbl = new QLabel( txt, this );
    layout->addWidget( lbl );
  }

  QHBoxLayout *hbox = new QHBoxLayout();
  layout->addLayout( hbox );
  hbox->setSpacing( KDialog::spacingHint() );

  mPageView = new QTreeWidget( this );
  mPageView->setHeaderLabel( i18n( "Available Pages" ) );
  mPageView->setRootIsDecorated( true );
  mPageView->setAllColumnsShowFocus( true );
  mPageView->header()->setResizeMode( QHeaderView::Stretch );
  hbox->addWidget( mPageView );

  QGroupBox *box = new QGroupBox( i18n( "Preview of Selected Page" ), this );
  QVBoxLayout *boxLayout = new QVBoxLayout( box );

  mPagePreview = new QLabel( box );
  mPagePreview->setMinimumWidth( 300 );
  boxLayout->addWidget( mPagePreview );

  mPageDetails = new QLabel( box );
  boxLayout->addWidget( mPageDetails );
  boxLayout->addStretch( 1 );

  hbox->addWidget( box );

  loadUiFiles();

  hbox = new QHBoxLayout();
  layout->addLayout( hbox );
  hbox->setSpacing( KDialog::spacingHint() );

  QString cwHowto =
    i18n( "<qt><p>This section allows you to add your own GUI"
          " Elements ('<i>Widgets</i>') to store your own values"
          " into %1. Proceed as described below:</p>"
          "<ol>"
          "<li>Click on '<i>Edit with Qt Designer</i>'</li>"
          "<li>In the dialog, select '<i>Widget</i>', then click <i>OK</i></li>"
          "<li>Add your widgets to the form</li>"
          "<li>Save the file in the directory proposed by Qt Designer</li>"
          "<li>Close Qt Designer</li>"
          "</ol>"
          "<p>In case you already have a designer file (*.ui) located"
          " somewhere on your hard disk, simply choose '<i>Import Page</i>'</p>"
          "<p><b>Important:</b> The name of each input widget you place within"
          " the form must start with '<i>X_</i>'; so if you want the widget to"
          " correspond to your custom entry '<i>X-Foo</i>', set the widget's"
          " <i>name</i> property to '<i>X_Foo</i>'.</p>"
          "<p><b>Important:</b> The widget will edit custom fields with an"
          " application name of %2.  To change the application name"
          " to be edited, set the widget name in Qt Designer.</p></qt>",
          applicationName(), applicationName() );

  QLabel *activeLabel = new QLabel(
    i18n( "<a href=\"whatsthis:%1\">How does this work?</a>", cwHowto ), this );
  activeLabel->setTextInteractionFlags( Qt::LinksAccessibleByMouse|
                                        Qt::LinksAccessibleByKeyboard );
  activeLabel->setContextMenuPolicy(Qt::NoContextMenu);
  connect( activeLabel, SIGNAL(linkActivated(QString)),
           this, SLOT(showWhatsThis(QString)) );
  hbox->addWidget( activeLabel );

  // ### why is this needed? Looks like a KActiveLabel bug...
  activeLabel->setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Maximum );

  hbox->addStretch( 1 );

  mDeleteButton = new QPushButton( i18n( "Delete Page" ), this );
  mDeleteButton->setEnabled( false );
  hbox->addWidget( mDeleteButton );
  mImportButton = new QPushButton( i18n( "Import Page..." ), this );
  hbox->addWidget( mImportButton );
  mDesignerButton = new QPushButton( i18n( "Edit with Qt Designer..." ), this );
  hbox->addWidget( mDesignerButton );

  if ( noDesigner ) {
    mDesignerButton->setEnabled( false );
  }
}

void KCMDesignerFields::updatePreview()
{
  QTreeWidgetItem *item = 0;
  if ( mPageView->selectedItems().size() == 1 ) {
    item = mPageView->selectedItems().first();
  }
  bool widgetItemSelected = false;

  if ( item ) {
    if ( item->parent() ) {
      QString details = QString::fromLatin1( "<qt><table>"
                                 "<tr><td align=\"right\"><b>%1</b></td><td>%2</td></tr>"
                                 "<tr><td align=\"right\"><b>%3</b></td><td>%4</td></tr>"
                                 "<tr><td align=\"right\"><b>%5</b></td><td>%6</td></tr>"
                                 "<tr><td align=\"right\"><b>%7</b></td><td>%8</td></tr>"
                                 "</table></qt>" )
                                .arg( i18n( "Key:" ) )
                                .arg( item->text( 0 ).replace( QLatin1String("X_"),QLatin1String("X-") ) )
                                .arg( i18n( "Type:" ) )
                                .arg( item->text( 1 ) )
                                .arg( i18n( "Classname:" ) )
                                .arg( item->text( 2 ) )
                                .arg( i18n( "Description:" ) )
                                .arg( item->text( 3 ) );

      mPageDetails->setText( details );

      PageItem *pageItem = static_cast<PageItem*>( item->parent() );
      mPagePreview->setWindowIcon( pageItem->preview() );
    } else {
      mPageDetails->setText( QString() );

      PageItem *pageItem = static_cast<PageItem*>( item );
      mPagePreview->setWindowIcon( pageItem->preview() );

      widgetItemSelected = true;
    }

    mPagePreview->setFrameStyle( QFrame::StyledPanel | QFrame::Sunken );
  } else {
    mPagePreview->setWindowIcon( QPixmap() );
    mPagePreview->setFrameStyle( 0 );
    mPageDetails->setText( QString() );
  }

  mDeleteButton->setEnabled( widgetItemSelected );
}

void KCMDesignerFields::itemClicked( QTreeWidgetItem *item )
{
  if ( !item || item->parent() != 0 ) {
    return;
  }

  PageItem *pageItem = static_cast<PageItem*>( item );

  if ( pageItem->isOn() != pageItem->isActive() ) {
    emit changed( true );
    pageItem->setIsActive( pageItem->isOn() );
  }
}

void KCMDesignerFields::startDesigner()
{
  QString cmdLine = QLatin1String("designer");

  // check if path exists and create one if not.
  QString cepPath = localUiDir();
  if( !KGlobal::dirs()->exists(cepPath) ) {
    KIO::NetAccess::mkdir( cepPath, this );
  }

  // finally jump there
  QDir::setCurrent( QLatin1String(cepPath.toLocal8Bit()) );

  QTreeWidgetItem *item = 0;
  if ( mPageView->selectedItems().size() == 1 ) {
    item = mPageView->selectedItems().first();
  }
  if ( item ) {
    PageItem *pageItem = static_cast<PageItem*>( item->parent() ? item->parent() : item );
    cmdLine += QLatin1Char(' ') + KShell::quoteArg( pageItem->path() );
  }

  KRun::runCommand( cmdLine, topLevelWidget() );
}

void KCMDesignerFields::showWhatsThis( const QString &href )
{
  if ( href.startsWith( QLatin1String( "whatsthis:" ) ) ) {
    QPoint pos = QCursor::pos();
    QWhatsThis::showText( pos, href.mid( 10 ), this );
  }
}