/* $Id: Settings.cpp,v 1.14 2002/07/20 18:14:13 barnabygray Exp $
 * 
 * Copyright (C) 2001 Barnaby Gray <barnaby@beedesign.co.uk>.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include "Settings.h"

#include <stdio.h>
#include <unistd.h>

#include <iostream>
#include <fstream>
#include "sstream_fix.h"

using std::string;
using std::ostringstream;
using std::istringstream;
using std::ifstream;
using std::ofstream;
using std::endl;
using std::map;
using std::runtime_error;

Settings::Settings() {
  defaultSettings();
}

void Settings::load(const string& filename)
  throw (runtime_error)
{

  ifstream inf(filename.c_str());
  if (!inf) {
    ostringstream ostr;
    ostr << "Settings::load: Could not open file for reading: "
	 << filename;
    throw runtime_error( ostr.str() );
  }

  while (inf) {
    string k, t, v;
    inf >> k >> t;
    if (t == "=") {
      while(inf.peek() == ' ') inf.ignore();
      getline(inf,v);

      m_map[k] = Unescape(v);
    }
  }
}

void Settings::save(const string& filename)
  throw (runtime_error)
{

  /* save to a temporary file first, then switch over, that way we
     should behave better on systems run by muppets have let their
     filesystem run down to no space left  */
  string tempfilename = filename + ".temp";

  ofstream of( tempfilename.c_str(), std::ios::out | std::ios::trunc );
  if (!of) {
    ostringstream ostr;
    ostr << "Settings::save: Could not open temporary settings file to save to: "
	 << tempfilename;
    throw runtime_error( ostr.str() );
  }
  
  map<const string,string>::iterator curr = m_map.begin();
  while (curr != m_map.end()) {
    of << (*curr).first << " = " << Escape((*curr).second) << endl;
    if (!of) {
      of.close();
      unlink( tempfilename.c_str() );
      ostringstream ostr;
      ostr << "Settings::save: Failed writing to temporary file: "
	   << tempfilename;
      throw runtime_error( ostr.str() );
    }
    ++curr;
  }
  of.close();

  // swap over temporary file to real file
  if ( rename( tempfilename.c_str(), filename.c_str() ) == -1 ) {
    ostringstream ostr;
    ostr << "Settings::save: Failed renaming temporary file to replace old file: "
	 << filename;
    throw runtime_error( ostr.str() );
  }
  
}

string Settings::Escape(const string& s) {
  ostringstream ostr;
  string::const_iterator curr = s.begin();
  while (curr != s.end()) {
    switch(*curr) {
    case '\n':
      ostr << "\\n";
      break;
    case '\r':
      ostr << "\\r";
      break;
    case '\\':
      ostr << "\\\\";
      break;
    default:
      ostr << (*curr);
    }
    ++curr;
  }

  return ostr.str();
}

string Settings::Unescape(const string& s) {
  ostringstream ostr;
  string::const_iterator curr = s.begin();
  while (curr != s.end()) {
    if (*curr == '\\') {
      ++curr;
      if (curr != s.end()) {
	switch(*curr) {
	case 'n':
	  ostr << "\n";
	  break;
	case 'r':
	  ostr << "\r";
	  break;
	case '\\':
	  ostr << "\\";
	  break;
	}
      } else {
	ostr << "\\";
      }
    } else {
      ostr << (*curr);
    }
    ++curr;
  }

  return ostr.str();
}

string Settings::getValueString(const string& k) {
  if ( exists(k) ) return m_map[k];
  else return string();
}

int Settings::getValueInt(const string& k) {
  int ret = 0;
  if ( exists(k) ) {
    istringstream istr(m_map[k]);
    istr >> ret;
  }
  return ret;
}


unsigned int Settings::getValueUnsignedInt(const string& k) {
  unsigned int v = 0;
  if ( exists(k) ) {
    istringstream istr(m_map[k]);
    istr >> v;
  }
  return v;
}

unsigned short Settings::getValueUnsignedShort(const string& k) {
  unsigned short v = 0;
  if ( exists(k) ) {
    istringstream istr(m_map[k]);
    istr >> v;
  }
  return v;
}

unsigned char Settings::getValueUnsignedChar(const string& k) {
  unsigned char v = 0;
  if ( exists(k) ) {
    unsigned int vi = 0;
    istringstream istr(m_map[k]);
    istr >> vi;
    v = (unsigned char)vi;
  }
  return v;
}


bool Settings::getValueBool(const string& k) {
  return !(getValueUnsignedShort(k) == 0);
}

void Settings::defaultValueUnsignedInt(const string& k, unsigned int dflt,
				       unsigned int lower, unsigned int upper)
{
  unsigned int v;
  if ( exists(k) ) {
    v = getValueUnsignedInt(k);
    if (v < lower) v = lower;
    if (v > upper) v = upper;
  } else {
    v = dflt;
  }
  setValue(k,v);
}

void Settings::defaultValueUnsignedShort(const string& k, unsigned short dflt,
					 unsigned short lower, unsigned short upper)
{
  unsigned short v;
  if ( exists(k) ) {
    v = getValueUnsignedShort(k);
    if (v < lower) v = lower;
    if (v > upper) v = upper;
  } else {
    v = dflt;
  }
  setValue(k,v);
}

void Settings::defaultValueUnsignedChar(const string& k, unsigned char dflt,
					unsigned char lower, unsigned char upper)
{
  unsigned char v;
  if ( exists(k) ) {
    v = getValueUnsignedChar(k);
    if (v < lower) v = lower;
    if (v > upper) v = upper;
  } else {
    v = dflt;
  }
  setValue(k,v);
}

void Settings::defaultValueBool(const string& k, bool dflt)
{
  if ( !exists(k) ) setValue(k, dflt);
}

void Settings::defaultValueString(const string& k, const string& dflt)
{
  if ( !exists(k) ) setValue(k, dflt);
}

void Settings::setValue(const string& k, const string& v) {
  m_map[k] = v;
  settings_changed.emit( k );
}

void Settings::setValue(const string& k, int v) {
  ostringstream ostr;
  ostr << v;
  if( m_map[k] != ostr.str() ) {
    m_map[k] = ostr.str();
    settings_changed.emit( k );
  }
}

void Settings::setValue(const string& k, unsigned int v) {
  ostringstream ostr;
  ostr << v;
  if( m_map[k] != ostr.str() ) {
    m_map[k] = ostr.str();
    settings_changed.emit( k );
  }
}

void Settings::setValue(const string& k, unsigned short v) {
  ostringstream ostr;
  ostr << v;
  m_map[k] = ostr.str();
  settings_changed.emit( k );
}

void Settings::setValue(const string& k, unsigned char v) {
  ostringstream ostr;
  ostr << (unsigned int)v;
  if( m_map[k] != ostr.str() ) {
    m_map[k] = ostr.str();
    settings_changed.emit( k );
  }
}

void Settings::setValue(const string& k, bool v) {
  if( m_map[k] != (v ? "1" : "0") ) {
    m_map[k] = (v ? "1" : "0");
    settings_changed.emit( k );
  }
}

bool Settings::exists(const string& k) {
  return (m_map.count(k) != 0);
}

void Settings::defaultSettings() {
  // virtual
}