/*
 * 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>

#include <iostream>

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;
}

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

  std::ifstream file(filename.c_str());
  ConfigEntry *currentEntry = this;
  ConfigEntry *lastEntry = this;
  String line, input;
  UChar delim;
  std::vector<String> splitLine;

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

  while(!(file.eof() && line.isEmpty() && input.isEmpty())) {
    while(input.isEmpty() && !file.eof()) {
      input = String::getline(file);
    }

    if(input.isEmpty())
      break;

    boost::int32_t pos = input.findFirstOf("#{}");
    if(pos < 0) {
      line += input;
      delim = '\n';
      input.remove();
    }
    else {
      line += input.substr(0, pos);
      delim = input[pos];
      input.remove(0, pos+1);
    }

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

    if(!splitLine.empty()) {
      boost::shared_ptr<ConfigEntry> entry(new ConfigEntry(currentEntry, std::vector<String>(splitLine.begin()+1, splitLine.end())));
      currentEntry->addChild(splitLine.front(), entry);
      lastEntry = entry.get();
    }

    switch(delim) {
      case '#':
        input.remove();
        break;
      case '{':
        currentEntry = lastEntry;
        break;
      case '}':
        lastEntry = currentEntry = currentEntry->getParent();
    }

    line.remove();
  }

  // TODO Depth check

  return true;
}

void ConfigManager::configure() {
  if(configured)
    return;

  while(!unconfiguredConfigurables.empty()) {
    std::set<Configurable*, Compare>::iterator it = unconfiguredConfigurables.begin();
    Configurable *c = *it;
    unconfiguredConfigurables.erase(it);

    c->configure();
  }

  configured = true;
}

}
}