/* Copyright (C) 2025 awy <awy@awy.one>

   This file is part of stbar.

   stbar 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.

   stbar 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 stbar. If not, see
   <https://www.gnu.org/licenses/>. */

#include "../util.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

static void buttonhandler(void)
{
  char *term;
  char *env;
  int button;

  button = 0;
  if ((env = getenv("BLOCK_BUTTON")))
    button = getbtnint(env);

  if (!(term = getenv("TERMINAL")))
    term = "footclient";

  const char *termcmd[] = {term, "-e", "btop", NULL};

  switch (button) {
  case 1:
    break;
  case 2:
    spawn(termcmd);
    break;
    /* case 3:
      sendnotif("stmemory", "󰍛 Memory module",
        "- Shows Memory Used.\n- Click to show memory hogs.\n\
  - Middle click to open btop."); */
    break;
  default:
    break;
  }
}

int stmemory(void)
{
  FILE *fp;
  uintmax_t total, free, buffers, cached, used, shmem, sreclaimable;

  buttonhandler();

  if (!(fp = fopen("/proc/meminfo", "r")))
    die("failed to open: /proc/meminfo");

  if (lscanf(fp, "MemTotal:", "%ju kB", &total) != 1 ||
      lscanf(fp, "MemFree:", "%ju kB", &free) != 1 ||
      lscanf(fp, "Buffers:", "%ju kB", &buffers) != 1 ||
      lscanf(fp, "Cached:", "%ju kB", &cached) != 1 ||
      lscanf(fp, "Shmem:", "%ju kB", &shmem) != 1 ||
      lscanf(fp, "SReclaimable:", "%ju kB", &sreclaimable) != 1) {
    fclose(fp);
    return -1;
  }
  fclose(fp);

  used = total - free - buffers - cached - sreclaimable + shmem;

  printf("%.1f GiB\n", (double)used / (1024.0 * 1024.0));

  return 0;
}