#!/bin/bash
#by Csandriel
#22.02.17

#plays radio and can save track/artist data for later downloading
#uses mpg123 for mp3 streaming

#username, will be used to launch the script, if it called by root.
#To avoid ussues with permissions
USER=user
#keep track of all played traks ^_^. Must have liberal permissions
#items for the best-list is taken from the tail of this "journal"
LOG="/home/bin/.mus.log"
#these files too must be accesible for writing to everyone
#best list
BEST="/store0/mp3/xes-bestmusic.log"
#will run in background. Need a reference to kill with.
PIDFILE="/home/bin/.xes.pid"

#radio address:port. May be extracted from playlist distributed by station.
#TODO:add an option to switch stantions. Maybe from configfile.
ADDRESS="http://46.163.111.34:8030"

USAGE_MSG="Invalid argument! \n Usage: xes [-k|-s|-l|-clear] \n
where \n -k -- kill; \n -s -- save to best-list \n -l -- roll-out best-list
 -clear -- clear best-list"
RESTART_MSG=\'"$PIDFILE' exists. It seems xes have been launched yet. Killing/Cleaning/Restart. \n Log-file will be reseted."

#if launched as root then restart script as user
if [ $UID -eq 0 ] ; then echo "DROP ROOT & recurse"; echo "$0 $@"; su $USER -c "$0 $@"; exit; fi


dokill () {
    cat "$PIDFILE"|xargs kill; rm "$PIDFILE" "$LOG"
    }

case $1 in

    -k) if [ -f $PIDFILE ] ; then dokill ; else echo "xes is down. There is left only to kill yourself"; fi
        ;;
    -s) cat $LOG|tail -n1|sed "s_.*Title=\([^;]*\).*_\1_" >> $BEST
        ;;
    -l) cat "$BEST"
        ;;
    -clear) echo "BEST-LIST WILL BE CLEANCED! Are You sure? [y/<any key>]"
        read r; if [ "$r" == "y" ] ; then > "$BEST" ; else exit 0; fi
        ;;
    *) if [ $# -eq 0 ]
        then
        if [ -f $PIDFILE ]
                then echo -e $RESTART_MSG; dokill;
        fi
        mpg123 "$ADDRESS" &> $LOG & PID=$!
        echo "$PID" > "$PIDFILE"


     else echo -e "$USAGE_MSG"
     exit 1
     fi
     ;;
esac