/*  This file is part of the KDE libraries and the Kate part.
 *
 *  Copyright (C) 2008 - 2012 Erlend Hamberg <ehamberg@gmail.com>
 *  Copyright (C) 2009 Paul Gideon Dann <pdgiddie@gmail.com>
 *  Copyright (C) 2011 Svyatoslav Kuzmich <svatoslav1@gmail.com>
 *
 *  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 "katevimodebase.h"
#include "katevirange.h"
#include "kateglobal.h"
#include "kateviglobal.h"
#include "katevivisualmode.h"
#include "katevinormalmode.h"
#include "katevireplacemode.h"
#include "kateviinputmodemanager.h"

#include <QString>
#include <QRegExp>
#include "kateconfig.h"
#include "katedocument.h"
#include "kateviewinternal.h"
#include "katevimodebar.h"
#include <ktexteditor/view.h>
#include "katerenderer.h"

using KTextEditor::Cursor;
using KTextEditor::Range;

// TODO: the "previous word/WORD [end]" methods should be optimized. now they're being called in a
// loop and all calculations done up to finding a match are trown away when called with a count > 1
// because they will simply be called again from the last found position.
// They should take the count as a parameter and collect the positions in a QList, then return
// element (count - 1)

////////////////////////////////////////////////////////////////////////////////
// HELPER METHODS
////////////////////////////////////////////////////////////////////////////////

bool KateViModeBase::deleteRange( KateViRange &r, OperationMode mode, bool addToRegister)
{
  r.normalize();
  bool res = false;
  QString removedText = getRange( r, mode );

  if ( mode == LineWise ) {
    doc()->editStart();
    for ( int i = 0; i < r.endLine-r.startLine+1; i++ ) {
      res = doc()->removeLine( r.startLine );
    }
    doc()->editEnd();
  } else {
      res = doc()->removeText( Range( r.startLine, r.startColumn, r.endLine, r.endColumn), mode == Block );
  }

  if ( addToRegister ) {
    if ( r.startLine == r.endLine ) {
      fillRegister( getChosenRegister( '-' ), removedText, mode );
    } else {
      fillRegister( getChosenRegister( '0' ), removedText, mode );
    }
  }

  return res;
}

const QString KateViModeBase::getRange( KateViRange &r, OperationMode mode) const
{
  r.normalize();
  QString s;

  if ( mode == LineWise ) {
    r.startColumn = 0;
    r.endColumn = getLine( r.endLine ).length();
  }

  if ( r.motionType == ViMotion::InclusiveMotion ) {
    r.endColumn++;
  }

  Range range( r.startLine, r.startColumn, r.endLine, r.endColumn);

  if ( mode == LineWise ) {
    s = doc()->textLines( range ).join( QChar( '\n' ) );
    s.append( QChar( '\n' ) );
  } else if ( mode == Block ) {
      s = doc()->text( range, true );
  } else {
      s = doc()->text( range );
  }

  return s;
}

const QString KateViModeBase::getLine( int lineNumber ) const
{
  QString line;

  if ( lineNumber == -1 ) {
    Cursor cursor ( m_view->cursorPosition() );
    line = m_view->currentTextLine();
  } else {
    line = doc()->line( lineNumber );
  }

  return line;
}

const QChar KateViModeBase::getCharUnderCursor() const
{
  Cursor c( m_view->cursorPosition() );

  QString line = getLine( c.line() );

  if ( line.length() == 0 && c.column() >= line.length() ) {
    return QChar::Null;
  }

  return line.at( c.column() );
}

const QString KateViModeBase::getWordUnderCursor() const
{
  Cursor c( m_view->cursorPosition() );

  // find first character that is a “word letter” and start the search there
  QChar ch = doc()->character( c );
  int i = 0;
  while ( !ch.isLetterOrNumber() && ! ch.isMark() && ch != '_'
      && m_extraWordCharacters.indexOf( ch) == -1 ) {

    // advance cursor one position
    c.setColumn( c.column()+1 );
    if ( c.column() > doc()->lineLength( c.line() ) ) {
      c.setColumn(0);
      c.setLine( c.line()+1 );
    }

    ch = doc()->character( c );
    i++; // count characters that were advanced so we know where to start the search
  }

  // move cursor the word (if cursor was placed on e.g. a paren, this will move
  // it to the right
  updateCursor( c );

  Cursor c1 = findPrevWordStart( c.line(), c.column()+1+i, true );
  Cursor c2 = findWordEnd( c1.line(), c1.column()+i-1, true );
  c2.setColumn( c2.column()+1 );

  return doc()->text( Range( c1, c2 ) );
}

KateViRange KateViModeBase::findPattern( const QString &pattern, bool backwards, int count ) const
{
  kDebug( 13070 ) << "searching for pattern \"" << pattern << "\", backwards = " << backwards
    << ", count = " << count;
  if ( pattern.isEmpty() ) {
    return KateViRange();
  }

  Cursor c( m_view->cursorPosition() );

  KTextEditor::Search::SearchOptions flags = KTextEditor::Search::Regex;

  if ( backwards ) {
    flags |= KTextEditor::Search::Backwards;
  }

  for ( int i = count; i > 0; i-- ) {
    // prepare two ranges, one from start → cursor and one from cursor → end
    Range r1 = Range( Cursor( 0,0 ), c );

    // we want to search from current position + one
    if ( c.column() < doc()->lineLength( c.line() ) ) {
      c.setColumn( c.column()+1 );
    } else if ( c.line() < doc()->lines() ) {
      c.setColumn( 0 );
      c.setLine( c.line()+1 );
    }

    Range r2 = Range( c, doc()->documentEnd() );

    //kDebug( 13070 ) << "r1: " << r1;
    //kDebug( 13070 ) << "r2: " << r2;

    //// see if we can find the term before the end of the document (opposite if backwards)
    //kDebug( 13070 ) << "searching for " << pattern << " in " << (backwards ? "r1" : "r2") << " backwards = " << backwards;
    Range result = doc()->searchText( backwards ? r1 : r2, pattern, flags ).first();
    //kDebug( 13070 ) << "result: " << result;

    if ( result.isValid() ) {
      c = result.start();
    } else {

      // no hits, continue from the top
      result = doc()->searchText( backwards ? r2 : r1, pattern, flags ).first();

      c = result.start();
    }
  }

  return KateViRange( c.line(), c.column(), ViMotion::ExclusiveMotion );
}

Cursor KateViModeBase::findNextWordStart( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  // the start of word pattern need to take m_extraWordCharacters into account if defined
  QString startOfWordPattern("\\b(\\w");
  if ( m_extraWordCharacters.length() > 0 ) {
    startOfWordPattern.append( QLatin1String( "|[" )+m_extraWordCharacters+']' );
  }
  startOfWordPattern.append( ')' );

  QRegExp startOfWord( startOfWordPattern );    // start of a word
  QRegExp nonSpaceAfterSpace( "\\s\\S" );       // non-space right after space
  QRegExp nonWordAfterWord( "\\b(?!\\s)\\W" );  // word-boundary followed by a non-word which is not a space

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
    int c1 = startOfWord.indexIn( line, c + 1 );
    int c2 = nonSpaceAfterSpace.indexIn( line, c );
    int c3 = nonWordAfterWord.indexIn( line, c + 1 );

    if ( c1 == -1 && c2 == -1 && c3 == -1 ) {
        if ( onlyCurrentLine ) {
            return Cursor( l, c );
        } else if ( l >= doc()->lines()-1 ) {
            c = qMax(line.length()-1, 0);
            return Cursor( l, c );
        } else {
            c = 0;
            l++;

            line = getLine( l );

        if ( line.length() == 0 || !line.at( c ).isSpace() ) {
          found = true;
        }

        continue;
      }
    }

    c2++; // the second regexp will match one character *before* the character we want to go to

    if ( c1 <= 0 )
      c1 = line.length()-1;
    if ( c2 <= 0 )
      c2 = line.length()-1;
    if ( c3 <= 0 )
      c3 = line.length()-1;

    c = qMin( c1, qMin( c2, c3 ) );

    found = true;
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findNextWORDStart( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  Cursor cursor ( m_view->cursorPosition() );
  QString line = getLine();
  KateViRange r( cursor.line(), cursor.column(), ViMotion::ExclusiveMotion );

  int l = fromLine;
  int c = fromColumn;

  bool found = false;
  QRegExp startOfWORD("\\s\\S");

  while ( !found ) {
    c = startOfWORD.indexIn( line, c+1 );

    if ( c == -1 ) {
      if ( onlyCurrentLine ) {
          return Cursor( l, c );
      } else if ( l >= doc()->lines()-1 ) {
        c = line.length()-1;
        break;
      } else {
        c = 0;
        l++;

        line = getLine( l );

        if ( line.length() == 0 || !line.at( c ).isSpace() ) {
          found = true;
        }

        continue;
      }
    } else {
      c++;
      found = true;
    }
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findPrevWordEnd( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  QString endOfWordPattern = "\\S\\s|\\S$|\\w\\W|\\S\\b|^$";

  if ( m_extraWordCharacters.length() > 0 ) {
   endOfWordPattern.append( "|["+m_extraWordCharacters+"][^" +m_extraWordCharacters+']' );
  }

  QRegExp endOfWord( endOfWordPattern );

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
      int c1 = endOfWord.lastIndexIn( line, c-1 );

      if ( c1 != -1 && c-1 != -1 ) {
          found = true;
          c = c1;
      } else {
          if ( onlyCurrentLine ) {
              return Cursor( l, c );
          } else if ( l > 0 ) {
              line = getLine( --l );
              c = line.length();

              continue;
          } else {
              c = 0;
              return Cursor( l, c );
          }
      }
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findPrevWORDEnd( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  QRegExp endOfWORDPattern( "\\S\\s|\\S$|^$" );

  QRegExp endOfWORD( endOfWORDPattern );

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
      int c1 = endOfWORD.lastIndexIn( line, c-1 );

      if ( c1 != -1 && c-1 != -1 ) {
          found = true;
          c = c1;
      } else {
          if ( onlyCurrentLine ) {
              return Cursor( l, c );
          } else if ( l > 0 ) {
              line = getLine( --l );
              c = line.length();

              continue;
          } else {
              c = 0;
              return Cursor( l, c );
          }
      }
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findPrevWordStart( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  // the start of word pattern need to take m_extraWordCharacters into account if defined
  QString startOfWordPattern("\\b(\\w");
  if ( m_extraWordCharacters.length() > 0 ) {
    startOfWordPattern.append( QLatin1String( "|[" )+m_extraWordCharacters+']' );
  }
  startOfWordPattern.append( ')' );

  QRegExp startOfWord( startOfWordPattern );    // start of a word
  QRegExp nonSpaceAfterSpace( "\\s\\S" );       // non-space right after space
  QRegExp nonWordAfterWord( "\\b(?!\\s)\\W" );  // word-boundary followed by a non-word which is not a space
  QRegExp startOfLine( "^\\S" );                // non-space at start of line

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
    int c1 = startOfWord.lastIndexIn( line, -line.length()+c-1 );
    int c2 = nonSpaceAfterSpace.lastIndexIn( line, -line.length()+c-2 );
    int c3 = nonWordAfterWord.lastIndexIn( line, -line.length()+c-1 );
    int c4 = startOfLine.lastIndexIn( line, -line.length()+c-1 );

    if ( c1 == -1 && c2 == -1 && c3 == -1 && c4 == -1 ) {
      if ( onlyCurrentLine ) {
          return Cursor( l, c );
      } else if ( l <= 0 ) {
        return Cursor( 0, 0 );
      } else {
        line = getLine( --l );
        c = line.length();

        if ( line.length() == 0 ) {
          c = 0;
          found = true;
        }

        continue;
      }
    }

    c2++; // the second regexp will match one character *before* the character we want to go to

    if ( c1 <= 0 )
      c1 = 0;
    if ( c2 <= 0 )
      c2 = 0;
    if ( c3 <= 0 )
      c3 = 0;
    if ( c4 <= 0 )
      c4 = 0;

    c = qMax( c1, qMax( c2, qMax( c3, c4 ) ) );

    found = true;
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findPrevWORDStart( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  QRegExp startOfWORD("\\s\\S");
  QRegExp startOfLineWORD("^\\S");

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
    int c1 = startOfWORD.lastIndexIn( line, -line.length()+c-2 );
    int c2 = startOfLineWORD.lastIndexIn( line, -line.length()+c-1 );

    if ( c1 == -1 && c2 == -1 ) {
      if ( onlyCurrentLine ) {
          return Cursor( l, c );
      } else if ( l <= 0 ) {
        return Cursor( 0, 0 );
      } else {
        line = getLine( --l );
        c = line.length();

        if ( line.length() == 0 ) {
          c = 0;
          found = true;
        }

        continue;
      }
    }

    c1++; // the startOfWORD pattern matches one character before the word

    c = qMax( c1, c2 );

    if ( c <= 0 )
      c = 0;

    found = true;
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findWordEnd( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  QString endOfWordPattern = "\\S\\s|\\S$|\\w\\W|\\S\\b";

  if ( m_extraWordCharacters.length() > 0 ) {
   endOfWordPattern.append( "|["+m_extraWordCharacters+"][^" +m_extraWordCharacters+']' );
  }

  QRegExp endOfWORD( endOfWordPattern );

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
      int c1 = endOfWORD.indexIn( line, c+1 );

      if ( c1 != -1 ) {
          found = true;
          c = c1;
      } else {
          if ( onlyCurrentLine ) {
              return Cursor( l, c );
          } else if ( l >= doc()->lines()-1 ) {
              c = line.length()-1;
              return Cursor( l, c );
          } else {
              c = -1;
              line = getLine( ++l );

              continue;
          }
      }
  }

  return Cursor( l, c );
}

Cursor KateViModeBase::findWORDEnd( int fromLine, int fromColumn, bool onlyCurrentLine ) const
{
  QString line = getLine( fromLine );

  QRegExp endOfWORD( "\\S\\s|\\S$" );

  int l = fromLine;
  int c = fromColumn;

  bool found = false;

  while ( !found ) {
      int c1 = endOfWORD.indexIn( line, c+1 );

      if ( c1 != -1 ) {
          found = true;
          c = c1;
      } else {
          if ( onlyCurrentLine ) {
              return Cursor( l, c );
          } else if ( l >= doc()->lines()-1 ) {
              c = line.length()-1;
              return Cursor( l, c );
          } else {
              c = -1;
              line = getLine( ++l );

              continue;
          }
      }
  }

  return Cursor( l, c );
}

KateViRange innerRange(KateViRange range, bool inner) {
  KateViRange r = range;

  if (inner) {
    r.startColumn++;
    r.endColumn--;
    if ((r.startLine == r.endLine) && qAbs(r.startColumn - r.endColumn) < 2 )
      r.valid = false;
  }

  return r;
}

KateViRange KateViModeBase::findSurroundingQuotes( const QChar &c, bool inner ) const {
  Cursor cursor(m_view->cursorPosition());
  KateViRange r;
  r.startLine = cursor.line();
  r.endLine = cursor.line();

  QString line = doc()->line(cursor.line());


  // If cursor on the quote we should shoose the best direction.
  if (line.at(cursor.column()) == c) {

    int attribute = m_view->doc()->kateTextLine(cursor.line())->attribute(cursor.column());

    //  If at the beginning of the line - then we might search the end.
    if ( doc()->kateTextLine(cursor.line())->attribute(cursor.column() + 1) == attribute &&
         doc()->kateTextLine(cursor.line())->attribute(cursor.column() - 1) != attribute ) {
      r.startColumn = cursor.column();
      r.endColumn = line.indexOf( c, cursor.column() + 1 );

      return innerRange(r, inner);
    }

    //  If at the end of the line - then we might search the beginning.
    if ( doc()->kateTextLine(cursor.line())->attribute(cursor.column() + 1) != attribute &&
        doc()->kateTextLine(cursor.line())->attribute(cursor.column() - 1) == attribute ) {

      r.startColumn =line.lastIndexOf( c, cursor.column() - 1 ) ;
      r.endColumn = cursor.column();

      return innerRange(r, inner);

    }
    // Try to search the quote to right
    int c1 = line.indexOf(c, cursor.column() + 1);
    if ( c1 != -1 ) {
      r.startColumn = cursor.column();
      r.endColumn = c1;

      return innerRange(r, inner);
    }

    // Try to search the quote to left
    int c2 = line.lastIndexOf(c, cursor.column() - 1);
    if ( c2 != -1 ) {
      r.startColumn = c2;
      r.endColumn =  cursor.column();

      return innerRange(r, inner);
    }

    // Nothing found - give up :)
     r.valid = false;
     return r;
  }


  r.startColumn = line.lastIndexOf( c, cursor.column() );
  r.endColumn = line.indexOf( c, cursor.column() );

  if ( r.startColumn == -1 || r.endColumn == -1 || r.startColumn > r.endColumn ) {
    r.valid = false;
  }

  return innerRange(r, inner);
}


KateViRange KateViModeBase::findSurroundingBrackets( const QChar &c1,
                                                     const QChar &c2,
                                                     bool inner,
                                                     const QChar &nested1,
                                                     const QChar &nested2) const
{

  Cursor cursor( m_view->cursorPosition() );

  KateViRange r( cursor.line(), cursor.column(), ViMotion::InclusiveMotion );

  // Chars should not differs. For equal chars use findSurroundingQuotes.
  Q_ASSERT( c1 != c2 );

  QStack<QChar> stack;
  int column = cursor.column();
  int line = cursor.line();
  bool should_break = false;

  // Going through the text and pushing respectively brackets to the stack.
  // Then pop it out if the stack head is the bracket under cursor.

  if (column < m_view->doc()->line(line).size() && m_view->doc()->line(line).at(column) == c2) {
    r.endLine = line;
    r.endColumn = column;
  } else {

    if ( column < m_view->doc()->line(line).size() && m_view->doc()->line(line).at(column) == c1 )
      column++;

    stack.push(c2);
    for (; line < m_view->doc()->lines() && !should_break; line++ ) {
      for (;column < m_view->doc()->line( line ).size(); column++ ) {
        QChar next_char = stack.pop();

        if (next_char != m_view->doc()->line(line).at(column))
          stack.push(next_char);

        if ( stack.isEmpty() ) {
          should_break = true;
          break;
        }

        if ( m_view->doc()->line(line).at(column) == nested1 )
          stack.push(nested2);
      }
      if (should_break)
        break;

      column = 0;
    }

    if (!should_break) {
      r.valid = false;
      return r;
    }

    r.endColumn = column;
    r.endLine = line;

  }

  // The same algorythm but going from the left to right.

  line = cursor.line();
  column = cursor.column();

  if (column < m_view->doc()->line(line).size() && m_view->doc()->line(line).at(column) == c1) {
    r.startLine = line;
    r.startColumn = column;
  } else {
    if (column < m_view->doc()->line(line).size() && m_view->doc()->line(line).at(column) == c2) {
      column--;
    }

    stack.clear();
    stack.push(c1);

    should_break = false;
    for (; line >= 0 && !should_break; line-- ) {
      for (;column >= 0 &&  column < m_view->doc()->line(line).size(); column-- ) {
        QChar next_char = stack.pop();

        if (next_char != m_view->doc()->line(line).at(column)) {
          stack.push(next_char);
        }

        if ( stack.isEmpty() ) {
          should_break = true;
          break;
        }

        if ( m_view->doc()->line(line).at(column) == nested2 )
          stack.push(nested1);
      }

      if (should_break)
        break;

      column = m_view->doc()->line(line - 1).size() - 1;
    }

    if (!should_break) {
      r.valid = false;
      return r;
    }

    r.startColumn = column;
    r.startLine = line;

  }

  return innerRange(r, inner);
}

KateViRange KateViModeBase::findSurrounding( const QRegExp &c1, const QRegExp &c2, bool inner ) const
{
  Cursor cursor( m_view->cursorPosition() );
  QString line = getLine();

  int col1 = line.lastIndexOf( c1, cursor.column() );
  int col2 = line.indexOf( c2, cursor.column() );

  KateViRange r( cursor.line(), col1, cursor.line(), col2, ViMotion::InclusiveMotion );

  if ( col1 == -1 || col2 == -1 || col1 > col2 ) {
      r.valid = false;
  }

  if ( inner ) {
      r.startColumn++;
      r.endColumn--;
  }

  return r;
}

int KateViModeBase::findLineStartingWitchChar( const QChar &c, unsigned int count, bool forward ) const
{
  int line = m_view->cursorPosition().line();
  int lines = doc()->lines();
  unsigned int hits = 0;

  if ( forward ) {
    line++;
  } else {
    line--;
  }

  while ( line < lines && line > 0 && hits < count ) {
    QString l = getLine( line );
    if ( l.length() > 0 && l.at( 0 ) == c ) {
      hits++;
    }
    if ( hits != count ) {
      if ( forward ) {
        line++;
      } else {
        line--;
      }
    }
  }

  if ( hits == getCount() ) {
    return line;
  }

  return -1;
}

void KateViModeBase::updateCursor( const Cursor &c ) const
{
  m_viewInternal->updateCursor( c );
}

/**
 * @return the register given for the command. If no register was given, defaultReg is returned.
 */
QChar KateViModeBase::getChosenRegister( const QChar &defaultReg ) const
{
  QChar reg = ( m_register != QChar::Null ) ? m_register : defaultReg;

  return reg;
}

QString KateViModeBase::getRegisterContent( const QChar &reg ) const
{
  QString r = KateGlobal::self()->viInputModeGlobal()->getRegisterContent( reg );

  if ( r.isNull() ) {
    error( i18n( "Nothing in register %1", reg ));
  }

  return r;
}

OperationMode KateViModeBase::getRegisterFlag( const QChar &reg ) const
{
  return KateGlobal::self()->viInputModeGlobal()->getRegisterFlag( reg );
}

void KateViModeBase::fillRegister( const QChar &reg, const QString &text, OperationMode flag )
{
  KateGlobal::self()->viInputModeGlobal()->fillRegister( reg, text, flag );
}


void KateViModeBase::addJump(KTextEditor::Cursor cursor)
{
  m_viInputModeManager->addJump(cursor);
}

KTextEditor::Cursor KateViModeBase::getNextJump(KTextEditor::Cursor cursor)
{
  return m_viInputModeManager->getNextJump(cursor);
}

KTextEditor::Cursor KateViModeBase::getPrevJump(KTextEditor::Cursor cursor)
{
  return m_viInputModeManager->getPrevJump(cursor);
}

KateViRange KateViModeBase::goLineDown()
{
  return goLineUpDown( getCount() );
}

KateViRange KateViModeBase::goLineUp()
{
  return goLineUpDown( -getCount() );
}

/**
 * method for moving up or down one or more lines
 * note: the sticky column is always a virtual column
 */
KateViRange KateViModeBase::goLineUpDown( int lines )
{
  Cursor c( m_view->cursorPosition() );
  KateViRange r( c.line(), c.column(), ViMotion::InclusiveMotion );
  int tabstop = doc()->config()->tabWidth();

  // if in an empty document, just return
  if ( lines == 0 ) {
    return r;
  }

  r.endLine += lines;

  // limit end line to be from line 0 through the last line
  if ( r.endLine < 0 ) {
    r.endLine = 0;
  } else if ( r.endLine > doc()->lines()-1 ) {
    r.endLine = doc()->lines()-1;
  }

  Kate::TextLine startLine = doc()->plainKateTextLine( c.line() );
  Kate::TextLine endLine = doc()->plainKateTextLine( r.endLine );

  int endLineLen = doc()->lineLength( r.endLine )-1;

  if ( endLineLen < 0 ) {
    endLineLen = 0;
  }

  int endLineLenVirt = endLine->toVirtualColumn(endLineLen, tabstop);
  int virtColumnStart = startLine->toVirtualColumn(c.column(), tabstop);

  // if sticky column isn't set, set end column and set sticky column to its virtual column
  if ( m_stickyColumn == -1 ) {
    r.endColumn = endLine->fromVirtualColumn( virtColumnStart, tabstop );
    m_stickyColumn = virtColumnStart;
  } else {
    // sticky is set - set end column to its value
    r.endColumn = endLine->fromVirtualColumn( m_stickyColumn, tabstop );
  }

  // make sure end column won't be after the last column of a line
  if ( r.endColumn > endLineLen ) {
    r.endColumn = endLineLen;
  }

  // if we move to a line shorter than the current column, go to its end
  if ( virtColumnStart > endLineLenVirt ) {
    r.endColumn = endLineLen;
  }

  return r;
}

KateViRange KateViModeBase::goVisualLineUpDown(int lines) {

  Cursor c( m_view->cursorPosition() );
  KateViRange r( c.line(), c.column(), ViMotion::InclusiveMotion );
  int tabstop = doc()->config()->tabWidth();

  // if in an empty document, just return
  if ( lines == 0 ) {
    return r;
  }

  int line_height = m_view->renderer()->lineHeight();

  QPoint point = m_view->cursorToCoordinate(c);
  Cursor res = m_view->coordinatesToCursor(QPoint(point.x(), point.y() + lines * line_height));

  r.endColumn = res.column();
  r.endLine = res.line();

  if (r.endColumn == -1 || r.endLine == -1 || r.valid == false)
    return r;

  Kate::TextLine startLine = doc()->plainKateTextLine( c.line() );
  Kate::TextLine endLine = doc()->plainKateTextLine( r.endLine );

  int virtColumnStart = startLine->toVirtualColumn(c.column(), tabstop);

  int view_line = m_viewInternal->cache()->viewLine(c);
  int visualColumnStart = virtColumnStart - m_viewInternal->cache()->viewLine(view_line).startCol();

  if ( m_stickyColumn == -1 ) {
     m_stickyColumn = visualColumnStart;
  } else {
    int end_view_line = m_viewInternal->cache()->viewLine(res);
    int s_c = m_viewInternal->cache()->textLayout(res.line(), end_view_line).startCol();
    r.endColumn = endLine->fromVirtualColumn( m_stickyColumn + s_c, tabstop );
  }

  return r;
}


bool KateViModeBase::startNormalMode()
{
  // store the key presses for this "insert mode session" so that it can be repeated with the
  // '.' command
  if (!m_viInputModeManager->isReplayingLastChange()) {
    m_viInputModeManager->storeChangeCommand();
    m_viInputModeManager->clearLog();
  }

  m_viInputModeManager->viEnterNormalMode();
  m_view->doc()->setUndoMergeAllEdits(false);
  m_view->updateViModeBarMode();

  return true;
}

bool KateViModeBase::startInsertMode()
{
  m_viInputModeManager->viEnterInsertMode();
  m_view->doc()->setUndoMergeAllEdits(true);
  m_view->updateViModeBarMode();

  return true;
}

bool KateViModeBase::startReplaceMode()
{
  m_view->doc()->setUndoMergeAllEdits(true);
  m_viInputModeManager->viEnterReplaceMode();
  m_view->updateViModeBarMode();

  return true;
}

bool KateViModeBase::startVisualMode()
{
  if ( m_view->getCurrentViMode() == VisualLineMode ) {
    m_viInputModeManager->getViVisualMode()->setVisualLine( false );
    m_viInputModeManager->changeViMode(VisualMode);
  } else if (m_view->getCurrentViMode() == VisualBlockMode ) {
    m_viInputModeManager->getViVisualMode()->setVisualBlock( false );
    m_viInputModeManager->changeViMode(VisualMode);
  } else {
    m_viInputModeManager->viEnterVisualMode();
  }

  m_view->updateViModeBarMode();

  return true;
}

bool KateViModeBase::startVisualBlockMode()
{
  if ( m_view->getCurrentViMode() == VisualMode ) {
    m_viInputModeManager->getViVisualMode()->setVisualBlock( true );
    m_viInputModeManager->changeViMode(VisualBlockMode);
  } else {
    m_viInputModeManager->viEnterVisualMode( VisualBlockMode );
  }

  m_view->updateViModeBarMode();

  return true;
}

bool KateViModeBase::startVisualLineMode()
{
  if ( m_view->getCurrentViMode() == VisualMode ) {
    m_viInputModeManager->getViVisualMode()->setVisualLine( true );
    m_viInputModeManager->changeViMode(VisualLineMode);
  } else {
    m_viInputModeManager->viEnterVisualMode( VisualLineMode );
  }

  m_view->updateViModeBarMode();

  return true;
}

void KateViModeBase::error( const QString &errorMsg ) const
{
  m_view->viModeBar()->showErrorMessage(errorMsg);
}

void KateViModeBase::message( const QString &msg ) const
{
  m_view->viModeBar()->showMessage(msg);
}

QString KateViModeBase::getVerbatimKeys() const
{
  return m_keysVerbatim;
}

const QChar KateViModeBase::getCharAtVirtualColumn( QString &line, int virtualColumn,
    int tabWidth ) const
{
  int column = 0;
  int tempCol = 0;

  // sanity check: if the line is empty, there are no chars
  if ( line.length() == 0 ) {
    return QChar::Null;
  }

  while ( tempCol < virtualColumn ) {
    if ( line.at( column ) == '\t' ) {
      tempCol += tabWidth - ( tempCol % tabWidth );
    } else {
      tempCol++;
    }

    if ( tempCol <= virtualColumn ) {
      column++;

      if ( column >= line.length() ) {
        return QChar::Null;
      }
    }
  }

  if ( line.length() > column )
    return line.at( column );

  return QChar::Null;
}

void KateViModeBase::addToNumberUnderCursor( int count )
{
    Cursor c( m_view->cursorPosition() );
    QString line = getLine();

    int wordStart = findPrevWordStart( c.line(), c.column()+1, true ).column();
    int wordEnd = findWordEnd( c.line(), c.column()-1, true ).column();

    if (wordStart > 0 && line.at(wordStart - 1) == '-') wordStart--;

    QRegExp number( "(0x)([0-9a-fA-F]+)|\\-?\\d+" );

    int start = number.indexIn( line, wordStart );
    if ( start <= wordEnd ) {
        // FIXME: ignore leading zeroes
        QString nString = number.cap();
        bool ok = false;
        int base = number.cap( 1 ).isEmpty() ? 10 : 16;
        int n = nString.toInt( &ok, base );

        kDebug( 13070 ) << "base: " << base;
        kDebug( 13070 ) << "n: " << n;

        if ( !ok ) {
            // conversion to int failed. give up.
            return;
        }

        // increase/decrease number
        n += count;

        // create the new text string to be inserted. prepend with “0x” if in base 16
        QString newText = (base == 16 ? "0x" : "") + QString::number(n, base);

        // replace the old number string with the new
        doc()->editStart();
        doc()->removeText( KTextEditor::Range( c.line(), start , c.line(), start+nString.length() ) );
        doc()->insertText( KTextEditor::Cursor( c.line(), start ), newText );
        doc()->editEnd();
    }
}

void KateViModeBase::switchView(Direction direction) {

  QList<KateView*> visible_views;
  foreach (KateView* view,  KateGlobal::self()->views() ) {
      if (view->isVisible())
        visible_views.push_back(view);
  }

  QPoint current_point = m_view->mapToGlobal(m_view->pos());
  int curr_x1 = current_point.x();
  int curr_x2 = current_point.x() + m_view->width();
  int curr_y1 = current_point.y();
  int curr_y2 = current_point.y() + m_view->height();
  int curr_cursor_y = m_view->mapToGlobal(m_view->cursorToCoordinate(m_view->cursorPosition())).y();
  int curr_cursor_x = m_view->mapToGlobal(m_view->cursorToCoordinate(m_view->cursorPosition())).x();

  KateView *bestview = NULL;
  int  best_x1, best_x2, best_y1, best_y2, best_center_y, best_center_x;

  if (direction == Next && visible_views.count() != 1) {
    for (int i=0; i< visible_views.count(); i++) {
        if (visible_views.at(i) == m_view) {
          if (i != visible_views.count() - 1 )
            bestview = visible_views.at(i + 1);
          else
            bestview = visible_views.at(0);
        }
      }
  } else {
    foreach (KateView* view, visible_views ) {
      QPoint point = view->mapToGlobal(view->pos());
      int x1 = point.x();
      int x2 = point.x() + view->width();
      int y1 = point.y();
      int y2 = point.y() + m_view->height();
      int  center_y = (y1 + y2) / 2;
      int  center_x = (x1 + x2) / 2;

      switch (direction) {
        case Left:
          if (view != m_view && x2 <= curr_x1 &&
              ( x2 > best_x2 ||
                (x2 == best_x2 && qAbs(curr_cursor_y - center_y) < qAbs(curr_cursor_y - best_center_y)) ||
                bestview == NULL)){
            bestview = view;
            best_x2 = x2;
            best_center_y = center_y;
          }
          break;
        case Right:
          if (view != m_view && x1 >= curr_x2 &&
              ( x1 < best_x1 ||
                (x1 == best_x1 && qAbs(curr_cursor_y - center_y) < qAbs(curr_cursor_y - best_center_y)) ||
                bestview == NULL)){
            bestview = view;
            best_x1 = x1;
            best_center_y = center_y;
          }
          break;
        case Down:
          if (view != m_view && y1 >= curr_y2 &&
              ( y1 < best_y1 ||
                (y1 == best_y1 && qAbs(curr_cursor_x - center_x) < qAbs(curr_cursor_x - best_center_x)) ||
                bestview == NULL)){
            bestview = view;
            best_y1 = y1;
            best_center_x = center_x;
          }
        case Up:
          if (view != m_view && y2 <= curr_y1 &&
              ( y2 > best_y2 ||
                (y2 == best_y2 && qAbs(curr_cursor_x - center_x) < qAbs(curr_cursor_x - best_center_x)) ||
                bestview == NULL)){
            bestview = view;
            best_y2 = y2;
            best_center_x = center_x;
          }
          break;
        default:
          return;
      }

    }
  }
  if (bestview != NULL ) {
    bestview->setFocus();
    KateViewConfig::global()->setViInputMode(true);
  }
}
