/**
 * Cmon (c'mon) is a simple system resource monitor
 * Copyright (C) 2022  Aaron Ball <nullspoon@oper.io>
 * 
 * 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 <https://www.gnu.org/licenses/>.
 */
#include <stdio.h>
#include <stdlib.h>

#include "status.h"
#include "meminfo.h"
#include "netinfo.h"
#include "cpuinfo.h"
#include "diskinfo.h"
#include "proc.h"

int main(int argc, char* argv[]) {
  struct meminfo minfo; // Struct for relevant data from /proc/meminfo
  struct status status; // Struct for tracking measurement statuses

  if(! status_init(&status))
    return 1;
  status.count += 1;

  if(! meminfo_init(&minfo)) {
    fprintf(stderr, "ERROR: Could not read meminfo\n");
    return 1;
  }

  // Calculate max memory usage and average memory usage
  if(status.memusedmax < (minfo.used))
    status.memusedmax = minfo.used;
  status.memusedavg = (((status.count - 1) * status.memusedavg) + minfo.used) / status.count;
  status.memtotal = minfo.total;

  // Calculate load max and incremental load average
  double load = cpuinfo_load1m();
  if(status.loadmax < load)
    status.loadmax = load;
  status.loadavg = (((status.count - 1) * status.loadavg) + load) / status.count;

  // Store number of processors to make load values more useful
  status.nprocs = get_nprocs();

  // Store disk io metrics
  char* diskdev = "sda";
  if(getenv("CMON_DISKDEV") != NULL)
    diskdev = getenv("CMON_DISKDEV");
  disk_io_kb(diskdev, &status.diskreadkb, &status.diskwritekb);

  // Store number of processors to make load values more useful
  char* netdev = "wlan0";
  if(getenv("CMON_NETDEV") != NULL)
    netdev = getenv("CMON_NETDEV");
  status.nettx = net_x_bytes(netdev, 't');
  status.netrx = net_x_bytes(netdev, 'r');

  // Store uptime
  status.uptime = proc_uptime();

  // Cleanup!
  status_write(&status);
  return 0;
}