#!/bin/bash

#
#/
#/ Usage:
#/ check-env-temp.sh --critical-min=<centigrade> --warning-min=<centigrade> --warning-max=<centigrade> --critical-min=<centigrade> --help
#/ 
#/ Checks the memory usage
#/ 
#/ Options:
#/  -c, --critical-min=<centigrade>     The minimal degree centigrade of when to trigger a critical warning
#/  -w, --warning-min=<centigrade>      The minimal degree centigrade of when to trigger a warning
#/  -W, --warning-max=<centigrade>      The maximum degree centigrade of when to trigger a warning
#/  -C, --critical-max=<centigrade>     The maximum degree centigrade of when to trigger a critical warning
#/  -h, --help                          Display this help message
#/ 
#/ Exit Codes:
#/  0 Everything OK
#/  1 Warning level exceeded
#/  2 Critical level exceeded
#/  3 Unknown status
#/


Usage() {
    grep '^#/' "${script_dir}/${script_name}" | sed 's/^#\/\w*//'
}

GetOptions() {
    # https://stackoverflow.com/a/29754866
    OPTIONS=c:w:W:C:h
    LONGOPTS=critical-min:,warning-min:,:warning-max:,critical-max:,help

    # -use ! and PIPESTATUS to get exit code with errexit set
    # -temporarily store output to be able to check for errors
    # -activate quoting/enhanced mode (e.g. by writing out “--options”)
    # -pass arguments only via   -- "$@"   to separate them correctly
    ! PARSED=$(getopt --options=$OPTIONS --longoptions=$LONGOPTS --name "$0" -- "$@")
    if [[ ${PIPESTATUS[0]} -ne 0 ]]; then
        # e.g. return value is 1
        #  then getopt has complained about wrong arguments to stdout
        Usage
        exit 2
    fi

    # read getopt's output this way to handle the quoting right:
    eval set -- "$PARSED"

    # now enjoy the options in order and nicely split until we see --
    while true; do
        case "$1" in
            -c|--critital-min)
                critmin="$2"
                shift 2
                ;;
            -w|--warning-min)
                warnmin="$2"
                shift 2
                ;;
            -W|--warning-max)
                warnmax="$2"
                shift 2
                ;;
            -C|--critital-max)
                critmax="$2"
                shift 2
                ;;
            -h|--help)
                Usage
                exit 0
                ;;
            --)
                shift
                break
                ;;
            *)
                echo "MEMORY UNKNOWN - ${1} is not a valid parameter"
                exit 3
                ;;
        esac
    done
}
LC_NUMERIC="C"
critmin=5
warnmin=15
warnmax=40
critmax=45
script_name=$(basename "${0}")
script_dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
GetOptions "$@"

json=$(temper --json)
if [[ ${json} == '[]' ]]; then
    echo "MEMORY UNKNOWN - Temper USB not found"
    exit 3
fi

val=$(echo ${json} | jq '.[0]."internal temperature"' | bc -l)

if (( $(echo "$val < ${critmin}" | bc -l) )); then
    rval=2
    rmsg="CRITICAL"
elif (( $(echo "$val < ${warnmin}" | bc -l) )); then
    rval=1
    rmsg="WARNING"
elif (( $(echo "$val < ${warnmax}" | bc -l) )); then
    rval=0
    rmsg="OK"
elif (( $(echo "$val < ${critmax}" | bc -l) )); then
    rval=1
    rmsg="WARNING"
else
    rval=2
    rmsg="CRITICAL"
fi

dval=$(printf %.2f $(echo ${val}\ | bc -l))
dcritmin=$(printf %.2f $(echo ${critmin}\ | bc -l))
dwarnmin=$(printf %.2f $(echo ${warnmin}\ | bc -l))
dwarnmax=$(printf %.2f $(echo ${warnmax}\ | bc -l))
dcritmax=$(printf %.2f $(echo ${critmax}\ | bc -l))
unit="°"

echo "ENV TEMP ${rmsg} - Temperature: ${dval} |temp=${dval}${unit};${dwarnmin}:${dwarnmax};${dcritmin}:${dcritmax}"
exit $rval