#!/bin/bash

source ~/.config/herbstluftwm/settings.sh

# disable path name expansion or * will be expanded in the line
# cmd=( $line )
set -f

monitor=${1:-0}
monGeomitry=( $(herbstclient monitor_rect "$monitor") )
if [ -z "$monGeomitry" ] ;then
    echo "Invalid monitor $monitor"
    exit 1
fi

# monGeomitry has the format: WxH+X+Y
x=${monGeomitry[0]}
y=${monGeomitry[1]}
panel_width=$((${monGeomitry[2]}))
panel_height=20

# reserve space for tray on first monitor
if [ $monitor -eq 0 ] ; then
    panel_width=$(($panel_width - 100))
fi

panelGeometry=${panel_width}x${panel_height}+${x}+${y}

textellipsis() {
    awk -v len=100 '{ if (length($0) > len) print substr($0, 1, len-3) "..."; else print; }'
}

volume() {
    LEVEL=$(amixer get Master | tail -1 | sed 's/.*\[\([0-9]*\)%\].*/\1/')
    if [ "$LEVEL" -gt "49" ] ; then
        echo -en '\uf028';
    elif [ "$LEVEL" -gt "0" ] ; then
        echo -en '\uf027';
    else
        echo -en '\uf026';
    fi
    echo " ${LEVEL}%"
}

# events
{
    # now playing
    mpc idleloop player | cat &
    mpc_pid=$!

    # volume
    while true ; do
        echo -e "vol " $(volume)
	sleep 1 || break
    done > >(uniq_linebuffered) &
    vol_pid=$!

    # date
    while true ; do
        date +'date_min %Y-%m-%d %H:%M'
        sleep 1 || break
    done > >(uniq_linebuffered) &
    date_pid=$!

    # herbstluftwm
    herbstclient --idle

    # exiting; kill stray event-emitting processes
    kill $mpc_pid $vol_pid $date_pid
} 2> /dev/null | {
    TAGS=( $(herbstclient tag_status $monitor) )
    unset TAGS[${#TAGS[@]}]
    time=""
    song=""
    windowtitle=""
    visible=true

    while true ; do
        echo -n "%{l}%{F-}"
        for i in "${TAGS[@]}" ; do
            case ${i:0:1} in
                '#') # current tag
                    echo -n "%{U$active}%{+u}"
                    ;;
                '+') # active on other monitor
                    echo -n "%{U$activeOnMontior}%{+u}"
                    ;;
                ':')
                    echo -n "%{F$notempty}"
                    ;;
                '!') # urgent tag
                    echo -n "%{U$urgent}%{+u}"
                    ;;
                *)
                    echo -n "%{F$notused}"
                    ;;
            esac
            echo -n "%{A:select_tag ${i:1}:}"
            echo -n " ${i:1} "
            echo -n "%{A}"
            echo -n "%{-u}%{F-}%{B-}"
        done

        # center window title
        echo -n "%{c}$(echo ${windowtitle//^/^^} | textellipsis) "

        # align right
        echo -n "%{r}"
        if [ -n "$song" ] ; then
            echo -n "$song" "$song2"
        fi
        echo -en " $volume "
        echo -en "\uf133 $date"
        echo " "

        # wait for next event
        read line || break
        cmd=( $line )
        # find out event origin
        case "${cmd[0]}" in
            tag*)
                TAGS=( $(herbstclient tag_status $monitor) )
                unset TAGS[${#TAGS[@]}]
                ;;
            mpd_player|player)
                song="$(mpc -f %artist% current)"
		        song2="$(mpc -f %title% current)"
                ;;
            vol)
                volume="${cmd[@]:1}"
                ;;
            date_min)
                date="${cmd[@]:1}"
                ;;
	        focus_changed|window_title_changed)
                windowtitle="${cmd[@]:2}"
                ;;
            quit_panel)
                exit
                ;;
            reload)
                exit
                ;;
        esac
    done
} 2> /dev/null \
    | lemonbar \
        -g $panelGeometry \
        -f "$font" \
        -B "$bgcolor" -F "$fgcolor" \
        -u 2 \
    | while read line; do
        set $line
        case "$1" in
            select_tag )
                # make sure the current monitor is focused
                herbstclient focus_monitor $monitor
                herbstclient use $2
                ;;
        esac
    done