/*
    This file is part of libkdepim.

    Copyright (c) 2005 Rafal Rzepecki <divide@users.sourceforge.net>

    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 "categoryhierarchyreader.h"
#include "autochecktreewidget.h"
#include "kpimprefs.h"

#include <QComboBox>
#include <QStringList>
#include <Q3ListView>

using namespace KPIM;

inline QString &quote( QString &string )
{
  Q_ASSERT( KPimPrefs::categorySeparator != "@" );
  return string.replace( "@", "@0" ).replace( QString("\\") +
                                              KPimPrefs::categorySeparator,
                                              "@1" );
}

inline QStringList &unquote( QStringList &strings )
{
  return strings.replaceInStrings( "@1", KPimPrefs::categorySeparator ).replaceInStrings( "@0", "@" );
}

QStringList CategoryHierarchyReader::path( QString string )
{
  QStringList _path = quote( string).split( KPimPrefs::categorySeparator, QString::SkipEmptyParts );
  return unquote( _path );
}

void CategoryHierarchyReader::read( QStringList categories )
{
  clear();
  QStringList::Iterator it;

  // case insensitive sort
  QMap<QString, QString> map;
  foreach ( QString str, categories ) {
    map.insert( str.toLower(), str );
  }

  categories = map.values();

  QStringList last_path;
  for ( it = categories.begin(); it != categories.end(); ++it ) {
    QStringList _path = path( *it );

    // we need to figure out where last item and the new one differ
    QStringList::Iterator jt, kt;
    int split_level = 0;
    QStringList new_path = _path; // save it for later
    for (jt = _path.begin(), kt = last_path.begin(); jt != _path.end() && kt != last_path.end(); ++jt, ++kt)
      if (*jt == *kt) {
        split_level++;
      } else
        break; // now we have first non_equal component in the iterators

    // make a path relative to the shared ancestor
    if ( jt != _path.begin() )
      _path.erase( _path.begin(), jt );
    last_path = new_path;

    if ( _path.isEmpty() ) {
      // something is wrong, we already have this node
      continue;
    }

    // find that ancestor
    while ( split_level < depth() ) {
      goUp();
    }
    Q_ASSERT( split_level == depth() );

    // make the node and any non-existent ancestors
    while ( !_path.isEmpty() ) {
      addChild( _path.first(), QVariant( *it ) );
      _path.pop_front();
    }
  }
}

void CategoryHierarchyReaderQComboBox::clear()
{
  mBox->clear();
}

void CategoryHierarchyReaderQComboBox::goUp()
{
  mCurrentDepth--;
}

void CategoryHierarchyReaderQComboBox::addChild( const QString &label, const QVariant &userData )
{
  QString spaces;
  spaces.fill( ' ', 2 * mCurrentDepth );
  mBox->addItem( spaces + label, userData );
  mCurrentDepth++;
}

int CategoryHierarchyReaderQComboBox::depth() const
{
  return mCurrentDepth;
}

void CategoryHierarchyReaderQTreeWidget::clear()
{
  mTree->clear();
}

void CategoryHierarchyReaderQTreeWidget::goUp()
{
  Q_ASSERT( mItem );
  mItem = mItem->parent();
  --mCurrentDepth;
}

void CategoryHierarchyReaderQTreeWidget::addChild( const QString &label, const QVariant &userData )
{
  Q_UNUSED( userData );
  
  if ( mItem ) {
    mItem = new QTreeWidgetItem( mItem, QStringList() << label );
  } else {
    mItem = new QTreeWidgetItem( mTree, QStringList() << label );
  }

  mItem->setExpanded( true );
  ++mCurrentDepth;
}

int CategoryHierarchyReaderQTreeWidget::depth() const
{
  return mCurrentDepth;
}
