/*
 * ConfigManager.cpp
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "ConfigManager.h"
#include "ConfigEntry.h"
#include "Configurable.h"
#include "Logger.h"
#include "Util.h"

#include <fstream>
#include <stdexcept>

namespace Mad {
namespace Common {

ConfigManager ConfigManager::configManager;


bool ConfigManager::Compare::operator() (const Configurable *c1, const Configurable *c2) {
  if(c1->getPriority() != c2->getPriority())
    return c1->getPriority() > c2->getPriority();
  else
    return c1 < c2;
}


void ConfigManager::handleConfigEntry(const ConfigEntry &entry) {
  bool handled = false;

  for(std::set<Configurable*>::iterator c = configurables.begin(); c != configurables.end(); ++c) {
    if((*c)->handleConfigEntry(entry, handled))
      handled = true;
  }

  if(!handled)
    Logger::logf(Logger::WARNING, "Invalid config option '%s'.", entry[0].getKey().c_str());
}

bool ConfigManager::loadFile(const std::string &filename, bool finish) {
  std::ifstream file(filename.c_str());
  ConfigEntry entry;
  std::vector<std::string> subEntry;
  std::string line;

  if(!file.good())
    return false;

  while(!(file.eof() && line.empty())) {
    std::string nextLine;
    char bracket = 0;

    if(line.empty()) {
      std::getline(file, line);

      size_t pos = line.find_first_of('#');
      if(pos != std::string::npos)
        line = line.substr(0, pos);

      line = Util::trim(line);

      if(line.empty())
        continue;
    }

    size_t pos = line.find_first_of("{}");

    if(pos != std::string::npos) {
      bracket = line[pos];
      line = Util::trim(line.substr(0, pos));
      try {
        nextLine = Util::trim(line.substr(pos+1));
      }
      catch(std::out_of_range& e) {}
    }

    if(!line.empty()) {
      pos = line.find_first_of(" \t");

      subEntry.clear();

      if(pos == std::string::npos) {
        subEntry.push_back(line);
      }
      else {
        subEntry.push_back(line.substr(0, pos));
        subEntry.push_back(Util::trim(line.substr(pos)));
      }

      entry.push(subEntry);
      handleConfigEntry(entry);
      entry.pop();
    }

    switch(bracket) {
      case '{':
        entry.push(subEntry);
        break;
      case '}':
        entry.pop();
    }

    line = nextLine;
  }

  // TODO Depth check

  if(finish) {
    for(std::set<Configurable*>::iterator c = configurables.begin(); c != configurables.end(); ++c)
      (*c)->configFinished();
  }

  return true;
}

}
}