#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <regex>
#include <string>
#include <sstream>
#include <iostream>
#include "util.h"
#include "gfanet.h"

/////////////////////////////////////////////////////////////////////////////

#define _PROC_NET_DEV					"/proc/net/dev"

/////////////////////////////////////////////////////////////////////////////

int GetAvailableInterfaces(NETINTERFACE_LIST &nil)
{
	static const std::string strRegExLine = "^\\s*([^:]+):\\s*([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)\\s+([0-9]+)$";
	static std::regex regl(strRegExLine, std::regex_constants::ECMAScript | std::regex_constants::optimize);
	std::string buf;
	int nCntItf = 0;

	if(ReadFile(_PROC_NET_DEV, buf) > 0)
	{
		std::string line;
		std::istringstream iss(buf);
		std::istream stm(iss.rdbuf());

		while(std::getline(stm, line))
		{
			std::smatch resl;

			if(	line.size() > 0 &&
				regex_search(line, resl, regl))
			{
				if(resl.size() == 18)
				{
					NETINTERFACE ni;
					memset(&ni, 0, sizeof(ni));

					resl[1].str().copy(ni.name, sizeof(ni.name) - 1);
					ni.stats.rx_bytes			= std::stoul(resl[2].str());
					ni.stats.rx_packets			= std::stoul(resl[3].str());
					ni.stats.rx_errors			= std::stoul(resl[4].str());
					ni.stats.rx_dropped			= std::stoul(resl[5].str());
					ni.stats.rx_fifo_errors		= std::stoul(resl[6].str());
					ni.stats.rx_frame_errors	= std::stoul(resl[7].str());
					ni.stats.rx_compressed		= std::stoul(resl[8].str());
					ni.stats.rx_multicast		= std::stoul(resl[9].str());
					ni.stats.tx_bytes			= std::stoul(resl[10].str());
					ni.stats.tx_packets			= std::stoul(resl[11].str());
					ni.stats.tx_errors			= std::stoul(resl[12].str());
					ni.stats.tx_dropped			= std::stoul(resl[13].str());
					ni.stats.tx_fifo_errors		= std::stoul(resl[14].str());
					ni.stats.tx_collisions		= std::stoul(resl[15].str());
					ni.stats.tx_carrier_errors	= std::stoul(resl[16].str());
					ni.stats.tx_compressed		= std::stoul(resl[17].str());
					nil.push_back(ni);
					nCntItf++;
				}
			}
		}
	}

	return nCntItf;
}