#!/usr/bin/env bash

wm=monsterwm
ff="/tmp/$RANDOM.monsterwm.fifo"

tags=('■' '■' '■' '■' '■')
layouts=('' '' '' '' '') 

[[ -p $ff ]] || mkfifo -m 600 "$ff"

function statusbar
{
    sdate=" \b0\f7\u0  \b0\f1\u0" date="$(date +"%H:%M")"

    music="$(mpc current -f "%artist% - [%title%|%file%]")"
    if [ -z "$music" ]; then
        music="" smusic=""
    else
        smusic="$(mpc | sed -rn '2s/\[([[:alpha:]]+)].*/\1/p')"
        [ "$smusic" == "paused" ] && smusic=" \b0\f6\u0  \b0\f1\u0" || smusic=" \b0\f6\u0  \b0\f1\u0"
    fi

    if [ "$(amixer get Master | sed -nr '$ s:.*\[(.+)]$:\1:p')" == "off" ]; then
        vol="" svol=""
    else
        vol="$(amixer get Master | sed -nr '$ s:.*\[(.+%)].*:\1:p')"
        if [ "${vol%\%}" -le 10 ]; then
            svol=" \b0\f6\u0  \b0\f1\u0"
        elif [ "${vol%\%}" -le 20 ]; then
            svol=" \b0\f6\u0  \b0\f1\u0"
        else
            svol=" \b0\f6\u0  \b0\f1\u0"
        fi
    fi

    mem=$(free -m | awk '/buffers\/cache/ {print $3 MB}')
    if [ $mem -ge 1500 ]; then
        mem="$mem MB" smem="\b0\f3\u0  \b0\f1\u3"
    elif [ $mem -ge 800 ]; then
        mem="$mem MB" smem="\b0\f6\u0  \b0\f1\u0"
    else
        mem=""
    fi

    win=$(xdotool getactivewindow getwindowname)

    echo -n "$win \r  $smem$mem$svol$vol$smusic$music$sdate$date "
}

while read -t "0.1" -r wmout || true; do
    if [[ $wmout =~ ^(([[:digit:]]+:)+[[:digit:]]+ ?)+$ ]]; then
        read -ra desktops <<< "$wmout"

        tmp=
        for desktop in "${desktops[@]}"; do
            IFS=':' read -r d w m c u <<< "$desktop"
            # Tags labels
            label=${tags[$d]}
            # Current desktop color and enclosing char (yes/no)
            ((c)) && fg="7" bg="2" lc="\u7 " rc=" \ur" && layout=${layouts[$m]} || fg="1" bg="0" lc=" " rc=" "
            # Has windows ?
            ((w == 1)) && ((! c)) &&
              fg="6" lc="\u0 " rc=" \ur"
            ((w == 2)) && ((! c)) &&
              fg="5" lc="\u0 " rc=" \ur"
            ((w == 3)) && ((! c)) &&
              fg="4" lc="\u0 " rc=" \ur"
            ((w >= 4)) && ((! c)) &&
              fg="3" lc="\u0 " rc=" \ur"
            # Urgent windows ?
            ((u)) && fg="3" bg="1" lc="\u3 " rc=" \ur"

            tmp+="\f$fg\b$bg$lc$label$rc\fr\br"
        done
        # Merge the clients indications and the tile mode
        tmp+=" \u0\f7\b0|\u0\b0\f1 $layout \u0\b0\f7|\u0\b0\f1 "
    fi
    echo "$tmp $(statusbar)"
done < "$ff" | bar &

$wm > "$ff"

rm $ff