/*
 * This file is part of firk's window manager for x11 (fwm)
 * Copyright (C) 2022 firk <firk@cantconnect.ru>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include "main.h"
#include "config.h"
#include "fsysd.h"

static int batfd = -1, blfd = -1;

extern void fsysd_reopen(void) {
  if(batfd>=0) { close(batfd); batfd = -1; }
  if(blfd>=0) { close(blfd); blfd = -1; }
}

extern int fsysd_get_pwr(fsysd_pwr *r) {
  char buf[60];
  char *b, *b1;
  int k, j;
  if(!BATTERY_STATUS_FILE || !*BATTERY_STATUS_FILE) return 0;
  if(batfd<0 && (batfd=open(BATTERY_STATUS_FILE,O_RDONLY|O_NOCTTY))<0) return -1;
  k = pread(batfd, buf, sizeof(buf), 0);
  if(k<0) return -1;
  for(j=0; j<k && buf[j]!='\n'; j++);
  if(j<k) k=j; else if(k==(int)sizeof(buf)) k--;
  buf[k] = 0;
  r->charge_pctt = strtol(buf, &b, 10);
  if(b==buf || *b!=' ') return -2;
  r->is_ac = strtol(b, &b1, 10);
  if(b==b1 || *b1!=' ') return -2;
  r->is_charging = strtol(b1, &b, 10);
  if(b==b1 || *b!=' ') return -2;
  r->ac_err = strtol(b, &b1, 10);
  if(b==b1 || *b1!=' ') return -2;
  r->bat_err = strtol(b1, &b, 10);
  if(b==b1 || *b!=' ') return -2;
  return 1;
}

extern int fsysd_get_bl(void) {
  char buf[60];
  int r;
  if(!BACKLIGHT_FILE || !*BACKLIGHT_FILE) return -1;
  if(blfd<0 && (blfd=open(BACKLIGHT_FILE,O_RDWR|O_NOCTTY))<0) return -1;
  r = pread(blfd, buf, sizeof(buf)-1, 0);
  if(r<0) return -1;
  buf[r] = 0;
  if(*buf<'0' || *buf>'9') return -2;
  return atoi(buf);
}

extern int fsysd_set_bl(int bl) {
  char buf[60];
  int len;
  if(!BACKLIGHT_FILE || !*BACKLIGHT_FILE) return -1;
  if(blfd<0 && (blfd=open(BACKLIGHT_FILE,O_RDWR|O_NOCTTY))<0) return -1;
  snprintf(buf, sizeof(buf), "%d\n", bl);
  len = strlen(buf);
  if(pwrite(blfd, buf, len, 0)!=len) return -2;
  if(ftruncate(blfd, len)<0) return -2;
  return 0;
}