#!/usr/bin/env bash

# DESCRIPTION:
#   get ds18b20 sensor value
#
# DEPENDENCIES:
#   - sshpass
#
# PARAMETERS:
#   1: ssh host
#   2: ssh port
#   3: ssh username
#   4: ssh password
#   5: ds18b20 node
#
# FUNCTIONS:
#
#
# VARIABLES:
#

if [ -z "${1}" ] || \
   [ -z "${2}" ] || \
   [ -z "${3}" ] || \
   [ -z "${4}" ] || \
   [ -z "${5}" ]; then
  printf "%s\n" \
    "Usage example: ${0} 'host' 'port' 'username' 'password' 'node'"

  exit 1
fi

if ! command -v sshpass &> /dev/null; then
  printf "%s\n" "Not found dependencies"

  exit 1
fi

host=${1}
port=${2}
user=${3}
pass=${4}
node=${5}

#
# MAIN:
#

temp=$(sshpass -p "${pass}" ssh "${user}@${host}" -p "${port}" \
       -o "StrictHostKeyChecking=no" \
       -o "UserKnownHostsFile=/dev/null" \
       -o "LogLevel=ERROR" \
       "cat /sys/bus/w1/devices/${node}/temperature"
       )
if [ "${temp}" -lt 0 ]; then
  printf "%s\n" "$(("${temp}" / 1000)).$((-1 * "${temp}" % 1000))"
else
  printf "%s\n" "$(("${temp}" / 1000)).$(("${temp}" % 1000))"
fi

exit 0