/*
    This file is part of KHelpcenter.

    Copyright (c) 2003 Cornelius Schumacher <schumacher@kde.org>

    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.
*/

#include "formatter.h"

#include <KConfig>
#include <KConfigGroup>
#include <KSharedConfig>

#include <QDebug>
#include <QFile>
#include <QTextStream>
#include <QStandardPaths>

using namespace KHC;

Formatter::Formatter()
  : mHasTemplate( false )
{
}

Formatter:: ~Formatter()
{
}

bool Formatter::readTemplates()
{
  KConfigGroup cfg(KSharedConfig::openConfig(), "Templates");
  QString mainTemplate = cfg.readEntry( "MainTemplate" );

  if ( mainTemplate.isEmpty() ) 
  {
    mainTemplate = QStandardPaths::locate(QStandardPaths::DataLocation, "maintemplate" );
  }

  if ( mainTemplate.isEmpty() ) 
  {
    qWarning() << "Main template file name is empty." ;
    return false;
  }

  QFile f( mainTemplate );
  if ( !f.open( QIODevice::ReadOnly ) ) 
  {
    qWarning() << "Unable to open main template file '" << mainTemplate
                << "'." << endl;
    return false;
  }

  QTextStream ts( &f );
  QString line;
  enum State { IDLE, SINGLELINE, MULTILINE };
  State state = IDLE;
  QString symbol;
  QString endMarker;
  QString value;
  while( !( line = ts.readLine() ).isNull() ) {
    switch ( state ) {
      case IDLE:
        if ( !line.isEmpty() && !line.startsWith( '#' ) ) 
	{
          int pos = line.indexOf( "<<" );
          if ( pos >= 0 ) 
	  {
            state = MULTILINE;
            symbol = line.left( pos ).trimmed();
            endMarker = line.mid( pos + 2 ).trimmed();
          } else {
            state = SINGLELINE;
            symbol = line.trimmed();
          }
        }
        break;
      case SINGLELINE:
        mSymbols.insert( symbol, line );
        state = IDLE;
        break;
      case MULTILINE:
        if ( line.startsWith( endMarker ) )
	{
          mSymbols.insert( symbol, value );
          value = "";
          state = IDLE;
        } 
        else 
	{
          value += line + '\n';
        }
        break;
      default:
        qWarning() << "Formatter::readTemplates(): Illegal state: "
                  << static_cast<int>(state) << endl;
        break;
    }
  }

  f.close();

  QStringList requiredSymbols;
  requiredSymbols << "HEADER" << "FOOTER";

  bool success = true;
  QStringList::ConstIterator it2;
  for( it2 = requiredSymbols.constBegin(); it2 != requiredSymbols.constEnd(); ++it2 )
  {
    if ( !mSymbols.contains( *it2 ) ) 
    {
      success = false;
      qWarning() << "Symbol '" << *it2 << "' is missing from main template file."
                << endl;
    }
  }

  if ( success ) mHasTemplate = true;
  return success;
}

QString Formatter::header( const QString &title )
{
  QString s;
  if ( mHasTemplate )
  {
    s = mSymbols[ "HEADER" ];
    s.replace( "--TITLE:--", title );
  } else {
    s = QLatin1String("<html><head><title>") + title + QLatin1String("</title></head>\n<body>\n");
  }
  return s;
}

QString Formatter::footer()
{
  if ( mHasTemplate )
  {
    return mSymbols[ "FOOTER" ];
  } else {
    return QLatin1String("</body></html>");
  }
}

QString Formatter::separator()
{
  return "<hr>";
}

QString Formatter::docTitle( const QString &title )
{
  return QLatin1String("<h3><font color=\"red\">") + title + QLatin1String("</font></h3>");
}

QString Formatter::sectionHeader( const QString &section )
{
  return QLatin1String("<h2><font color=\"blue\">") + section + QLatin1String("</font></h2>");
}

QString Formatter::processResult( const QString &data )
{
  QString result;

  enum { Header, BodyTag, Body, Footer };

  int state = Header;

  for( int i = 0; i < data.length(); ++i )
  {
    QChar c = data[i];
    switch ( state ) 
    {
      case Header:
        if ( c == QLatin1Char('<') && data.mid( i, 5 ).toLower() == QLatin1String("<body") ) 
	{
          state = BodyTag;
          i += 4;
        }
        break;
      case BodyTag:
        if ( c == '>' ) state = Body;
        break;
      case Body:
        if ( c == QLatin1Char('<') && data.mid( i, 7 ).toLower() == QLatin1String("</body>") ) 
	{
          state = Footer;
        } else {
          result.append( c );
        }
        break;
      case Footer:
        break;
      default:
        result.append( c );
        break;
    }
  }

  if ( state == Header ) return data;
  else return result;
}

QString Formatter::paragraph( const QString &str )
{
  return QLatin1String("<p>") + str + QLatin1String("</p>");
}

QString Formatter::title( const QString &title )
{
  return QLatin1String("<h2>") + title + QLatin1String("</h2>");
}

// vim:ts=2:sw=2:et
