/*
 * 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 <cstdio>
#include <cstring>

namespace Mad {
namespace Common {
namespace Backends {

SystemBackendProc SystemBackendProc::backend;

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

  uptimeFile.seekg(0, std::ios::beg);

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

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

  uptime.uptime = (unsigned long)f;

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

  uptime.idleTime = (unsigned long)f;

  return uptime;
}

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

  meminfoFile.seekg(0, std::ios::beg);

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

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

    char *name = new char[line.length()+1]; // is always long enough
    unsigned long value;

    if(std::sscanf(line.c_str(), "%s %lu", name, &value) == 2) {
      if(std::strcmp(name, "MemTotal:") == 0)
        memInfo.totalMem = value;
      else if(std::strcmp(name, "MemFree:") == 0)
        memInfo.freeMem = value;
      else if(std::strcmp(name, "SwapTotal:") == 0)
        memInfo.totalSwap = value;
      else if(std::strcmp(name, "SwapFree:") == 0)
        memInfo.freeSwap = value;
    }

    delete [] name;

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


  return memInfo;
}

SystemBackend::LoadInfo SystemBackendProc::loadInfo() {
  LoadInfo loadInfo = {0, 0, 0, 0, 0};

  loadFile.seekg(0, std::ios::beg);

  if(!loadFile.good())
    return loadInfo;

  std::string line;
  std::getline(loadFile, line);

  if(line.empty())
    return loadInfo;

  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadInfo.loadAvg1, &loadInfo.loadAvg5, &loadInfo.loadAvg15, &loadInfo.currentLoad, &loadInfo.nProcesses);

  return loadInfo;
}

}
}
}