#!/bin/sh

default_music_dir="/media/wrk/music"

player_wrap ()
{
    # .mkv -> Matroska data
    # .ogg -> audio
    # .mp3 -> Audio
    # .webm -> Webm
    # .mp4 -> MP4
    # .m4a -> MPEG v4
    if [ -n "$(file "$1" | grep -E '(WebM|[Aa]udio)|Matroska data|MP(EG v)?4')" ]; then
        cvlc --play-and-exit --no-video "$1" 2>/dev/null || cvlc --play-and-exit "$1"
    else
        file "$1" >&2
    fi
}

mk_playlist ()
{
    # Use du(1) to allow a "structured" playlist.
    du -aL "$music_dir" | cut -f 2 | shuf \
    | while read -r filename; do
        test -d "$filename" || echo "$filename"
    done
}

usage="playshuf [-q] [music-directory]"

quiet=false
if [ "$1" = "-q" ]; then
    quiet=true
    shift
fi
if [ -n "$1" ]; then
    music_dir="$1"
else
    music_dir="$default_music_dir"
fi

# Print the usage line anyway.
$quiet || echo "Usage: $usage" >&2

# Main loop
while true; do
    i=0
    n="$(mk_playlist | wc -l)"
    mk_playlist | while read -r song; do
        i=$(($i + 1))
        $quiet || echo "$i/$n\t$song"
        sleep 2
        player_wrap "$song"
    done
done