/*
 * SystemBackendProc.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 "SystemBackendProc.h"

#include <fstream>
#include <pcrecpp.h>

#include <iostream>

namespace Mad {
namespace Common {
namespace Backends {

SystemBackend::UptimeInfo SystemBackendProc::getUptimeInfo() const {
  UptimeInfo uptime = {0, 0};

  std::ifstream file("/proc/uptime");

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

  float f;
  file >> f;
  if(!file.good())
    return uptime;

  uptime.uptime = (unsigned long)f;

  file >> f;
  if(!file.good())
    return uptime;

  uptime.idleTime = (unsigned long)f;

  return uptime;
}

SystemBackend::MemoryInfo SystemBackendProc::getMemoryInfo() const {
  MemoryInfo memInfo = {0, 0, 0, 0};

  std::ifstream file("/proc/meminfo");

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

  pcrecpp::RE re("(.+):\\s*(\\d+).*");

  while(!file.eof() && file.good()) {
    std::string line;
    std::getline(file, line);

    std::string name;
    unsigned long value;

    if(!re.FullMatch(line, &name, &value))
      continue;

    if(name == "MemTotal")
      memInfo.totalMem = value;
    else if(name == "MemFree")
      memInfo.freeMem = value;
    else if(name == "SwapTotal")
      memInfo.totalSwap = value;
    else if(name == "SwapFree")
      memInfo.freeSwap = value;

    if(memInfo.totalMem && memInfo.freeMem && memInfo.totalSwap && memInfo.freeSwap)
      break;
  }


  return memInfo;
}

}
}
}