/***************************************************************************

                   lesson properties dialog page

    -----------------------------------------------------------------------

    begin          : Thu Jun 3 22:03:50 1999

    copyright      : (C) 1999-2001 Ewald Arnold <kvoctrain@ewald-arnold.de>
                     (C) 2001 The KDE-EDU team
                     (C) 2005 Peter Hedlund <peter.hedlund@kdemail.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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "LessOptPage.h"

#include <tdeapplication.h>
#include <kinputdialog.h>
#include <tdelocale.h>
#include <tdemessagebox.h>

#include <tqcombobox.h>
#include <tqpushbutton.h>
#include <tqlayout.h>

#include <kvoctraindoc.h>

#define LESS_TAG ". "

LessOptPage::LessOptPage
(
  TQComboBox     *lessons,
  kvoctrainDoc  *_doc,
  TQWidget       *parent,
  const char    *name
)
  :
  LessOptPageForm( parent, name )
{
  connect( lessonList, TQ_SIGNAL(highlighted(int)), TQ_SLOT(slotLessonChosen(int)) );
  connect( b_new, TQ_SIGNAL(clicked()), TQ_SLOT(slotNewLesson()) );
  connect( b_modify, TQ_SIGNAL(clicked()), TQ_SLOT(slotModifyLesson()) );
  connect( b_delete, TQ_SIGNAL(clicked()), TQ_SLOT(slotDeleteLesson()) );
  connect( b_cleanup, TQ_SIGNAL(clicked()), TQ_SLOT(slotCleanup()) );

  doc = _doc;

  TQString str;
  for (int i = 1; i < lessons->count(); i++) {
    str.setNum (i);
    if (i <= 9)
      str.insert (0, " ");
    lessonList->insertItem (str+LESS_TAG+lessons->text(i));
    lessonIndex.push_back(i-1);
  }

  act_lesson = 0;
  if (lessonList->count() != 0)
    lessonList->setCurrentItem (act_lesson);
  lessonList->setFocus();

  b_modify->setEnabled(lessonList->count() != 0);
  b_delete->setEnabled(lessonList->count() != 0);
}


void LessOptPage::slotLessonChosen(int index)
{
  act_lesson = index;
}


void LessOptPage::slotNewLesson()
{
  bool ok;
  TQString getLesson = KInputDialog::getText(
              i18n( "Lesson Description" ), i18n( "Enter lesson description:" ), TQString(), &ok );
  if( !ok )
    return;
  TQString str;
  int i = lessonList->count()+1;
  str.setNum (i);
  if (i <= 9)
    str.insert (0, " ");
  lessonList->insertItem (str+LESS_TAG+getLesson.stripWhiteSpace());
  lessonIndex.push_back(-(i-1));
  act_lesson = lessonList->count();
  lessonList->setCurrentItem (i-1);
  b_modify->setEnabled(true);
  b_delete->setEnabled(true);
}


void LessOptPage::slotModifyLesson()
{
  if (lessonList->count() != 0 && (int) lessonList->count() > act_lesson)
  {
    TQString str = lessonList->text (act_lesson);
    int pos = str.find (LESS_TAG);
    str.remove (0, pos+strlen (LESS_TAG));
    bool ok;
    TQString getLesson = KInputDialog::getText(
                i18n( "Lesson Description" ), i18n( "Enter lesson description:" ), str, &ok );
    if( !ok )
      return;
    TQString str2;
    str2.setNum (act_lesson+1);
    if (act_lesson <= 9)
      str2.insert (0, " ");
    lessonList->changeItem (str2+LESS_TAG+getLesson.stripWhiteSpace(), act_lesson);
  }
}


void LessOptPage::updateListBox(int start)
{
  TQString str, str2;
  for (int i = start; i < (int) lessonList->count(); i++)
  {
    str = lessonList->text (i);
    int pos = str.find (LESS_TAG);
    str.remove (0, pos+strlen (LESS_TAG));
    str2.setNum (i+1);
    if (i <= 9)
      str2.insert (0, " ");
    lessonList->changeItem (str2+LESS_TAG+str, i);
  }
}


void LessOptPage::slotDeleteLesson()
{
  int act = act_lesson;
  if (lessonList->count() != 0
      && (int) lessonList->count() > act) {

    for (int ent = 0; ent < doc->numEntries(); ent++) {
      // FIXME: ProgressDlg here?
      if (doc->getEntry(ent)->getLesson() == lessonIndex[act_lesson]+1) {
        KMessageBox::information(this,
                  i18n("This lesson could not be deleted\nbecause it is in use."),
                  kapp->makeStdCaption(i18n("Deleting Lesson")));
        return;
      }
    }

    lessonList->removeItem (act);
    lessonIndex.erase (lessonIndex.begin() + act);

    if ((int) lessonList->count() <= act)
      act = lessonList->count()-1;
    else
      updateListBox(act); // update items after current

    if (act >= 0)
      lessonList->setCurrentItem (act);
  }
  b_modify->setEnabled(lessonList->count() != 0);
  b_delete->setEnabled(lessonList->count() != 0);
}


void LessOptPage::getLesson (TQComboBox *ret_lesson, vector<int> &ret_Index)
{
  while (ret_lesson->count() > 1) /* first entry is "no lesson" */
    ret_lesson->removeItem (1);

  TQString str;
  for (int i = 0; i < (int) lessonList->count(); i++) {
    str = lessonList->text(i);
    int pos = str.find (LESS_TAG);
    str.remove (0, pos+strlen (LESS_TAG));
    ret_lesson->insertItem (str);
  }
  ret_Index = lessonIndex;
}


void LessOptPage::slotCleanup()
{
  vector<bool> used_lesson;
  for (int i = 0; i < (int) lessonList->count(); i++)
    used_lesson.push_back(false);

  for (int i = 0; i < (int) doc->numEntries(); i++) {
    int idx = doc->getEntry(i)->getLesson();
    if ((int) used_lesson.size() < idx)
      used_lesson.resize(idx);
    if (idx != 0)
      used_lesson[idx-1] = true ;
  }

  for (int i = used_lesson.size()-1; i >= 0; i--)
    if (!used_lesson[i]) {
      for (int u = 0; u < (int) lessonIndex.size() ; u++) {
        if (lessonIndex[u] == i || lessonIndex[u] < 0) {
          act_lesson = i;
          slotDeleteLesson();
          break;
        }
      }
    }

  act_lesson = 0;
  lessonList->setCurrentItem (act_lesson);
}


void LessOptPage::cleanUnused (kvoctrainDoc *doc,
                               const TQComboBox * /*lessons*/,
                               const vector<int> &lessonIndex,
                               int old_lessons,
                               vector<int> &lessons_in_query)
{
  vector<int> translate_index;

  /////////////////////////////////////////////////////
  // translate_index contains new index number for each
  // old index
  for (int i = 0; i <= TQMAX (old_lessons, (int) lessonIndex.size()); i++)
    translate_index.push_back(0);

  // now adjust lesson descriptions to new index
  for (int i = 0; i < (int) lessonIndex.size(); i++) {
    if (lessonIndex[i] >= 0)
      translate_index[lessonIndex[i]+1] = i+1;
  }

  // now adjust for query selected lessons to new index
  for (int i = (int) lessons_in_query.size()-1; i >= 0; i--) {
    if (translate_index[lessons_in_query[i]] > 0)
      lessons_in_query[i] = translate_index[lessons_in_query[i]];
    else
      lessons_in_query.erase(lessons_in_query.begin() + i);
  }

  // only keep remaining lesson member indices

  // set lesson index to 0 when not needed any more
  // and translate to new index
  for (int i = 0; i < doc->numEntries(); i++) {
    if (doc->getEntry(i)->getLesson () != 0)
      doc->getEntry(i)->setLesson (translate_index[doc->getEntry(i)->getLesson ()]);
  }
}
#include "LessOptPage.moc"