/*
 * 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 Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "Application.h"
#include "ConfigManager.h"
#include "ConfigEntry.h"
#include "Configurable.h"
#include "Tokenizer.h"

#include <fstream>
#include <stdexcept>

namespace Mad {
namespace Core {

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

  if(!handled)
    application->logf(Logger::LOG_WARNING, "Invalid config option '%s'.", entry[entry.getSize()-1].getKey().c_str());
}

bool ConfigManager::loadFile(const std::string &filename) {
  if(finished)
    return false;

  std::ifstream file(filename.c_str());
  ConfigEntry entry;
  std::string line, input;
  char delim;
  std::vector<std::string> splitLine, lastConfigLine;

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

  while(!(file.eof() && line.empty() && input.empty())) {
    while(input.empty() && !file.eof())
      std::getline(file, input);

    if(input.empty())
      break;

    size_t pos = input.find_first_of("#{}");
    if(pos == std::string::npos) {
      line += input;
      delim = '\n';
      input.clear();
    }
    else {
      line += input.substr(0, pos);
      delim = input[pos];
      input = input.substr(pos+1);
    }

    if(!Tokenizer::tokenize(line, splitLine)) {
      line += delim;
      continue;
    }

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

      entry.push(splitLine);
      handleConfigEntry(entry);
      entry.pop();

      lastConfigLine = splitLine;
    }

    switch(delim) {
      case '#':
        input.clear();
        break;
      case '{':
        entry.push(lastConfigLine);
        break;
      case '}':
        entry.pop();
    }

    line.clear();
  }

  // TODO Depth check

  return true;
}

void ConfigManager::finish() {
  if(finished)
    return;

  for(std::set<Configurable*, Compare>::iterator c = configurables.begin(); c != configurables.end(); ++c)
    (*c)->configFinished();

  finished = true;
}

}
}