/*
    This file is part of KOrganizer.

    Copyright (c) 2000,2001 Cornelius Schumacher <schumacher@kde.org>
    Copyright (C) 2003-2004 Reinhold Kainhofer <reinhold@kainhofer.com>
    Copyright (c) 2005 Rafal Rzepecki <divide@users.sourceforge.net>

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

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

    As a special exception, permission is given to link this program
    with any edition of TQt, and distribute the resulting executable,
    without including the source code for TQt in the source distribution.
*/

#include "kotodoviewitem.h"
#include "kotodoview.h"
#include "koprefs.h"
#include "koglobals.h"

#include <libkcal/incidenceformatter.h>

#include <klocale.h>
#include <kdebug.h>
#include <tqpainter.h>
#include <tqpixmap.h>

#include <tqpainter.h>

KOTodoViewItem::KOTodoViewItem( TQListView *parent, Todo *todo, KOTodoView *kotodo)
  : TQCheckListItem( parent , "", CheckBox ), mTodo( todo ), mTodoView( kotodo )
{
  construct();
}

KOTodoViewItem::KOTodoViewItem( KOTodoViewItem *parent, Todo *todo, KOTodoView *kotodo )
  : TQCheckListItem( parent, "", CheckBox ), mTodo( todo ), mTodoView( kotodo )
{
  construct();
}

inline int KOTodoViewItem::compareDueDates( const KOTodoViewItem *b ) const
{
  if ( mEffectiveDueDate.isValid() &&
       !b->mEffectiveDueDate.isValid() )
    return -1;
  else if ( !mEffectiveDueDate.isValid() &&
            b->mEffectiveDueDate.isValid() )
    return 1;
  else
    return b->mEffectiveDueDate.secsTo( mEffectiveDueDate );
}

int KOTodoViewItem::compare( TQListViewItem *it, int col, bool ascending ) const
{
  KOTodoViewItem *i = dynamic_cast<KOTodoViewItem *>( it );
  if ( !i ) {
    return TQListViewItem::compare( it, col, ascending );
  }

  // throw completed todos to the bottom
  if ( mTodo->isCompleted() && !i->todo()->isCompleted() ) {
    return ascending ? 1 : -1;
  } else if ( !mTodo->isCompleted() && i->todo()->isCompleted() ) {
    return ascending ? -1 : 1;
  }

  int c;
  switch ( col ) {
  case KOTodoView::eSummaryColumn:
    return mTodo->summary().localeAwareCompare( i->todo()->summary() );

  case KOTodoView::eRecurColumn:
    return ( mTodo->doesRecur() ? 1 : 0 ) - ( i->todo()->doesRecur() ? 1 : 0 );

  case KOTodoView::ePriorityColumn:
    c = mTodo->priority() - i->todo()->priority();
    if ( c ) {
      return c;
    } else {
      return compareDueDates( i );
    }

  case KOTodoView::ePercentColumn:
    return mTodo->percentComplete() - i->todo()->percentComplete();

  case KOTodoView::eDueDateColumn:
    c = compareDueDates( i );
    if ( c ) {
      return c;
    } else {
      return mTodo->priority() - i->todo()->priority();
    }
  case KOTodoView::eCategoriesColumn:
    return mTodo->categoriesStr().localeAwareCompare( i->todo()->categoriesStr() );

  case KOTodoView::eFolderColumn:
    return TQListViewItem::compare( it, col, ascending );

#if 0
  case KOTodoView::eDescriptionColumn:
    return mTodo->description().localeAwareCompare( i->todo()->description() );
#endif

  default:
    Q_ASSERT( false && "unknown column to compare" );
    return TQListViewItem::compare( it, col, ascending );
  }
}

void KOTodoViewItem::paintBranches(TQPainter *p,const TQColorGroup & cg,int w,
                                   int y,int h)
{
  TQListViewItem::paintBranches(p,cg,w,y,h);
}

void KOTodoViewItem::construct()
{
  if ( !mTodo ) return;
  m_init = true;

  setOn( mTodo->isCompleted() );
  setText( KOTodoView::eSummaryColumn, mTodo->summary());
  static const TQPixmap recurPxmp = KOGlobals::self()->smallIcon("recur");
  if ( mTodo->doesRecur() )
    setPixmap( KOTodoView::eRecurColumn, recurPxmp );

  if ( mTodo->priority()==0 ) {
    setText( KOTodoView::ePriorityColumn, i18n("--") );
  } else {
    setText( KOTodoView::ePriorityColumn, TQString::number(mTodo->priority()) );
  }
  setText( KOTodoView::ePercentColumn, TQString::number(mTodo->percentComplete()) );

  if (mTodo->hasDueDate()) {
    TQString dtStr = mTodo->dtDueDateStr();
    if (!mTodo->doesFloat()) {
      dtStr += " " + mTodo->dtDueTimeStr();
    }
    setText( KOTodoView::eDueDateColumn, dtStr );
    mEffectiveDueDate = mTodo->dtDue();
    KOTodoViewItem *myParent;
    if ( ( myParent = dynamic_cast<KOTodoViewItem *>( parent() ) ) )
      if ( !myParent->mEffectiveDueDate.isValid() ||
          myParent->mEffectiveDueDate > mEffectiveDueDate ) {
        myParent->mEffectiveDueDate = mEffectiveDueDate;
      }
  } else
    setText( KOTodoView::eDueDateColumn, "" );

  setText( KOTodoView::eCategoriesColumn, mTodo->categoriesStr() );

  setText( KOTodoView::eFolderColumn,
           IncidenceFormatter::resourceString( mTodoView->calendar(), mTodo ) );

#if 0
  // Find sort id in description. It's the text behind the last '#' character
  // found in the description. White spaces are removed from beginning and end
  // of sort id.
  int pos = mTodo->description().findRev('#');
  if (pos < 0) {
    setText( KOTodoView::eDescriptionColumn, "" );
  } else {
    TQString str = mTodo->description().mid(pos+1);
    str.stripWhiteSpace();
    setText( KOTodoView::eDescriptionColumn, str );
  }
#endif

  m_known = false;
  m_init = false;
}

void KOTodoViewItem::stateChange( bool state )
{
  // do not change setting on startup or if no valid todo item is given
  if ( m_init || !mTodo ) return;

  if ( mTodo->isReadOnly() ) {
    setOn( mTodo->isCompleted() );
    return;
  }

  kdDebug(5850) << "State changed, modified " << state << endl;
  mTodoView->setNewPercentageDelayed( this, state ? 100 : 0 );
}

bool KOTodoViewItem::isAlternate()
{
#ifndef KORG_NOLVALTERNATION
  KOTodoListView *lv = static_cast<KOTodoListView *>(listView());
  if (lv && lv->alternateBackground().isValid())
  {
    KOTodoViewItem *above = 0;
    above = dynamic_cast<KOTodoViewItem *>(itemAbove());
    m_known = above ? above->m_known : true;
    if (m_known)
    {
       m_odd = above ? !above->m_odd : false;
    }
    else
    {
       KOTodoViewItem *item;
       bool previous = true;
       if (TQListViewItem::parent())
       {
          item = dynamic_cast<KOTodoViewItem *>(TQListViewItem::parent());
          if (item)
             previous = item->m_odd;
          item = dynamic_cast<KOTodoViewItem *>(TQListViewItem::parent()->firstChild());
       }
       else
       {
          item = dynamic_cast<KOTodoViewItem *>(lv->firstChild());
       }

       while(item)
       {
          item->m_odd = previous = !previous;
          item->m_known = true;
          item = dynamic_cast<KOTodoViewItem *>(item->nextSibling());
       }
    }
    return m_odd;
  }
  return false;
#else
  return false;
#endif
}

void KOTodoViewItem::paintCell(TQPainter *p, const TQColorGroup &cg, int column, int width, int tqalignment)
{
  TQColorGroup _cg = cg;
  // If no todo is set, just don't paint anything...
  if ( !mTodo ) return;
#ifndef KORG_NOLVALTERNATION
  if (isAlternate())
        _cg.setColor(TQColorGroup::Base, static_cast< KOTodoListView* >(listView())->alternateBackground());
  if (mTodo->hasDueDate()) {
    if (mTodo->dtDue().date()==TQDate::currentDate() &&
        !mTodo->isCompleted()) {
      _cg.setColor(TQColorGroup::Base, KOPrefs::instance()->mTodoDueTodayColor);
      _cg.setColor(TQColorGroup::Text, getTextColor(KOPrefs::instance()->mTodoDueTodayColor));
    }
    if (mTodo->dtDue().date() < TQDate::currentDate() &&
        !mTodo->isCompleted()) {
      _cg.setColor(TQColorGroup::Base, KOPrefs::instance()->mTodoOverdueColor);
      _cg.setColor(TQColorGroup::Text, getTextColor(KOPrefs::instance()->mTodoOverdueColor));
    }
  }
#endif

  // show the progess by a horizontal bar
  if ( column == KOTodoView::ePercentColumn ) {
    p->save();
    int progress = (int)(( (width-6)*mTodo->percentComplete())/100.0 + 0.5);

    p->fillRect( 0, 0, width, height(), _cg.base() ); // background
    p->setPen( KGlobalSettings::textColor() );  //border
    p->setBrush( KGlobalSettings::baseColor() );  //filling
    p->drawRect( 2, 2, width-4, height()-4);
    p->fillRect( 3, 3, progress, height()-6,
        KGlobalSettings::highlightColor() );
    p->restore();
  } else {
    TQCheckListItem::paintCell(p, _cg, column, width, tqalignment);
  }
}