/*
 * ModuleManager.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 "ModuleManager.h"

#include "ConfigEntry.h"
#include "Logger.h"

namespace Mad {
namespace Common {

ModuleManager ModuleManager::moduleManager;


void ModuleManager::doInit() {
  lt_dlinit();
}

void ModuleManager::doDeinit() {
  while(!moduleOrder.empty()) {
    unloadModule(moduleOrder.top());
    moduleOrder.pop();
  }

  lt_dlexit();
}

bool ModuleManager::handleConfigEntry(const ConfigEntry &entry, bool handled) {
  if(handled)
    return false;

  if(entry[0].getKey().matches("LoadModule")) {
    if(!loadModule(entry[0][0].c_str()))
      Logger::logf(Logger::ERROR, "Can't load module '%s'.", entry[0][0].c_str());

    return true;
  }

  return false;
}

bool ModuleManager::loadModule(const std::string &name) {
  lt_dlhandle handle = lt_dlopen(name.c_str());

  if(!handle)
    return false;

  void (*initFun)();
  initFun = (void(*)())lt_dlsym(handle, "init");

  if(initFun)
    (*initFun)();

  modules.insert(std::make_pair(name, handle));
  moduleOrder.push(name);

  return true;
}

void ModuleManager::unloadModule(const std::string &name) {
  void (*deinitFun)();
  deinitFun = (void(*)())lt_dlsym(modules[name], "deinit");

  if(deinitFun)
    (*deinitFun)();

  lt_dlclose(modules[name]);

  modules.erase(name);
}

}
}