/*
 * 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 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 "SystemBackendProc.h"

#include <Core/ThreadManager.h>

#include <cstdio>
#include <cstring>

namespace Mad {
namespace Modules {
namespace SystemBackendProc {

void SystemBackendProc::getUptimeInfo(unsigned long *uptime, unsigned long *idleTime) throw(Core::Exception) {
  application->getThreadManager()->detach();

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

  if(!uptimeFile.good())
    throw(Core::Exception(Core::Exception::NOT_AVAILABLE));

  float f;
  uptimeFile >> f;
  if(!uptimeFile.good())
    throw(Core::Exception(Core::Exception::NOT_AVAILABLE));

  if(uptime)
  *uptime = (unsigned long)f;

  uptimeFile >> f;
  if(uptimeFile.good() && idleTime)
    *idleTime = (unsigned long)f;
}

void SystemBackendProc::getMemoryInfo(unsigned long *totalMem, unsigned long *freeMem, unsigned long *totalSwap, unsigned long *freeSwap) throw(Core::Exception) {
  application->getThreadManager()->detach();

  if(totalMem)
    *totalMem = 0;
  if(freeMem)
    *freeMem = 0;
  if(totalSwap)
    *totalSwap = 0;
  if(freeSwap)
    *freeSwap = 0;

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

  if(!meminfoFile.good())
    throw(Core::Exception(Core::Exception::NOT_AVAILABLE));

  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 && totalMem)
        *totalMem = value;
      else if(std::strcmp(name, "MemFree:") == 0 && freeMem)
        *freeMem = value;
      else if(std::strcmp(name, "SwapTotal:") == 0 && totalSwap)
        *totalSwap = value;
      else if(std::strcmp(name, "SwapFree:" ) == 0 && freeSwap)
        *freeSwap = value;
    }

    delete [] name;

    if((!totalMem || *totalMem) && (!freeMem || *freeMem) && (!totalSwap || *totalSwap) && (!freeSwap || *freeSwap))
      break;
  }
}

void SystemBackendProc::getLoadInfo(unsigned long *currentLoad, unsigned long *nProcesses, float *loadAvg1, float *loadAvg5, float *loadAvg15) throw(Core::Exception) {
  application->getThreadManager()->detach();

  unsigned long currentLoadValue = 0, nProcessesValue = 0;
  float loadAvg1Value = 0, loadAvg5Value = 0, loadAvg15Value = 0;

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

  if(!loadFile.good())
    throw(Core::Exception(Core::Exception::NOT_AVAILABLE));

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

  if(line.empty())
    throw(Core::Exception(Core::Exception::NOT_AVAILABLE));

  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadAvg1Value, &loadAvg5Value, &loadAvg15Value, &currentLoadValue, &nProcessesValue);

  if(currentLoad)
    *currentLoad = currentLoadValue;

  if(nProcesses)
    *nProcesses = nProcessesValue;

  if(loadAvg1)
    *loadAvg1 = loadAvg1Value;

  if(loadAvg5)
    *loadAvg5 = loadAvg5Value;

  if(loadAvg15)
    *loadAvg15 = loadAvg15Value;
}

}
}
}