#!/bin/sh
# motd-assist :: sysinfo-panel — Load, Speicher, Disk und Updates als farbige Balken
set -u

E=$(printf '\033')
GREEN="${E}[38;5;114m"
YELLOW="${E}[38;5;221m"
RED="${E}[38;5;203m"
LBLUE="${E}[38;5;75m"
DIM="${E}[2m"
R="${E}[0m"

BAR=22

# bar <used> <total> — farbiger Balken mit Prozentanzeige
bar() {
	awk -v u="$1" -v t="$2" -v b="$BAR" -v g="$GREEN" -v y="$YELLOW" -v r="$RED" -v d="$DIM" -v rset="$R" 'BEGIN{
		if (t <= 0) { printf "%sn/a%s", d, rset; exit }
		pct = u * 100 / t
		if (pct > 100) pct = 100
		f = int(pct / 100 * b + 0.5)
		c = (pct < 60) ? g : ((pct < 85) ? y : r)
		s = c
		for (i = 0; i < f; i++) s = s "━"
		s = s d
		for (i = f; i < b; i++) s = s "·"
		printf "%s%s%s %s%3d%%%s", s, rset, c, c, pct, rset
	}'
}

mem=$(awk '/^MemTotal:/ {t=$2} /^MemAvailable:/ {a=$2} END {if (t>0) printf "%.0f %.0f", t-a, t}' /proc/meminfo 2>/dev/null)
[ -n "$mem" ] && printf '%b\n' "$LBLUE MEM  $DIM│$R $(bar $mem)"

disk=$(df -P / 2>/dev/null | awk 'NR==2 {gsub("%","",$5); print $5}')
[ -n "$disk" ] && printf '%b\n' "$LBLUE DISK $DIM│$R $(bar $disk 100)"

if [ -r /proc/loadavg ]; then
	load=$(awk '{print $1}' /proc/loadavg)
	ncpu=$(getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1)
	case $ncpu in ''|*[!0-9]*) ncpu=1 ;; esac
	awk -v l="$load" -v n="$ncpu" -v b="$BAR" -v g="$GREEN" -v y="$YELLOW" -v r="$RED" -v d="$DIM" -v rset="$R" -v lbl="$LBLUE" 'BEGIN{
		pct = l * 100 / n
		if (pct > 100) pct = 100
		f = int(pct / 100 * b + 0.5)
		c = (pct < 60) ? g : ((pct < 85) ? y : r)
		s = c
		for (i = 0; i < f; i++) s = s "━"
		s = s d
		for (i = f; i < b; i++) s = s "·"
		printf "%s LOAD %s│%s %s%s%s %s%s/%s%s\n", lbl, d, rset, s, rset, c, c, l, n, rset
	}'
fi

if [ -r /var/lib/update-notifier/updates-available ]; then
	upd=$(awk 'NR==1 {print $1; exit}' /var/lib/update-notifier/updates-available 2>/dev/null)
	case $upd in
		''|*[!0-9]*) ;;
		*)
			awk -v n="$upd" -v g="$GREEN" -v y="$YELLOW" -v r="$RED" -v d="$DIM" -v rset="$R" -v lbl="$LBLUE" 'BEGIN{
				c = (n == 0) ? g : ((n < 20) ? y : r)
				txt = (n == 0) ? "System ist auf dem aktuellen Stand" : n " Paket-Updates verfügbar"
				printf "%s UPD  %s│%s %s%s%s\n", lbl, d, rset, c, txt, rset
			}'
			;;
	esac
fi