#!/bin/bash
# geklaut vom linuxhotel.de
LANG=C
export BUILD="2.9.64"
set -o nounset

function banner()
{
    local -A b
    local -i l
    local -i i
    
    b[00]='  000'
    b[01]=' 0   0'
    b[02]='0 0   0'
    b[03]='0  0  0'
    b[04]='0   0 0'
    b[05]=' 0   0'
    b[06]='  000'
    b[07]=''
    b[10]='   1'
    b[11]='  11'
    b[12]=' 1 1'
    b[13]='   1'
    b[14]='   1'
    b[15]='   1'
    b[16]=' 11111'
    b[17]=''
    b[20]=' 22222'
    b[21]='2     2'
    b[22]='      2'
    b[23]=' 22222'
    b[24]='2'
    b[25]='2'
    b[26]='2222222'
    b[27]=''
    b[30]=' 33333'
    b[31]='3     3'
    b[32]='      3'
    b[33]=' 33333'
    b[34]='      3'
    b[35]='3     3'
    b[36]=' 33333'
    b[37]=''
    b[40]='4'
    b[41]='4    4'
    b[42]='4    4'
    b[43]='4444444'
    b[44]='     4'
    b[45]='     4'
    b[46]='     4'
    b[47]=''
    b[50]='5555555'
    b[51]='5'
    b[52]='5'
    b[53]=' 55555'
    b[54]='      5'
    b[55]='5     5'
    b[56]=' 55555'
    b[57]=''
    b[60]=' 66666'
    b[61]='6     6'
    b[62]='6'
    b[63]='666666'
    b[64]='6     6'
    b[65]='6     6'
    b[66]=' 66666'
    b[67]=''
    b[70]='7777777'
    b[71]='7    7'
    b[72]='    7'
    b[73]='   7'
    b[74]='  7'
    b[75]='  7'
    b[76]='  7'
    b[77]=''
    b[80]=' 88888'
    b[81]='8     8'
    b[82]='8     8'
    b[83]=' 88888'
    b[84]='8     8'
    b[85]='8     8'
    b[86]=' 88888'
    b[87]=''
    b[90]=' 99999'
    b[91]='9     9'
    b[92]='9     9'
    b[93]=' 999999'
    b[94]='      9'
    b[95]='9     9'
    b[96]=' 99999'
    b[97]=''
    b[:0]='   :'
    b[:1]='  :::'
    b[:2]='   :'
    b[:3]=''
    b[:4]='   :'
    b[:5]='  :::'
    b[:6]='   :'
    b[:7]=''
    for ((l=0;l<8;l++)); do
      for ((i=0;i<${#1};i++)); do
        printf "%-8.8s" "${b[${1:i:1}$l]}"
      done
      echo
    done
}

function usage()
{
    local base="$(basename $0)"
    echo "Build: $BUILD"
    echo "Usage: $base HH:MM" >&2
    echo "       $base +minutes" >&2
    echo "       $base +0" >&2
}

if [ $# -ne 1 ]; then
    usage
    exit 1
elif [[ $1 =~ ^([01][0-9]|2[0-3]):[0-5][0-9]$ ]]; then
    dateHHMMSS="${1}:00"
elif [[ $1 =~ ^\+[0-9]+ ]]; then
    dateHHMMSS=$(date -d "now $1 minutes" +%H:%M:%S)
else
    usage
    exit 2
fi

clear
declare -i diff
declare -i initDiff=$(($(date -d "$dateHHMMSS" +%s)-$(date +%s)))
((initDiff == 0)) && initDiff=1
declare -i lenOutDate
declare -i lenOutTime
declare outDate
declare outTime
declare -r spaces="                                       "
declare -r pegel="#####################################"
declare -ri lenPegel=${#pegel}
declare -ri lenSpaces=${#spaces}
declare -i posPegel
declare -i pad

while true; do
    key=""
    diff=$(($(date -d "$dateHHMMSS" +%s)-$(date +%s)))
    
    outDate=$(date +"%Y-%m-%d %H:%M:%S")
    outTime="${dateHHMMSS} (${diff})"
    lenOutDate=${#outDate}
    lenOutTime=${#outTime}
    
    tput home
    pad=$((lenSpaces-lenOutDate))
    echo "${spaces:0:$((pad/2))}${outDate}${spaces:0:$((pad/2))} "
    pad=$((lenSpaces-lenOutTime))
    echo -e "${spaces:0:$((pad/2))}${outTime}${spaces:0:$((pad/2))} "
    posPegel=$((($initDiff-$diff)*$lenPegel/$initDiff))

    if (($diff >= 0 )); then
        echo "[${pegel:0:$posPegel}${spaces:$((posPegel+2))}]"
    else
        echo "$spaces"
    fi

    
    if (( $diff ==  0 )); then
        tput setaf 0
    elif (( $diff < 0 )); then
        ((diff=-diff))
        tput setaf 1
    elif (( $diff <  60 )); then
        tput setaf 4
    else
        tput setaf 2
    fi

    echo
    banner $(date -d @$diff +%M:%S)
    tput setaf 0
    echo -ne "\r               \r" && 
    read -s -t 1 -n 1 && read -s -t 3 -n 1 -p "sure? (-/n) " key &&  [ "$key" != "n" ] && break
done
echo -en "\r"