#!/usr/bin/env bash

NAME="ifconfig"
IFC_PATH=$(dirname $(readlink -f $0))
LOCK_FILE="$IFC_PATH/tmp/${NAME}.lock"
PID_FILE="$IFC_PATH/tmp/${NAME}.pid"
LOG_FILE="$IFC_PATH/tmp/${NAME}.log"
BIN="$IFC_PATH/$NAME"

E_USAGE=1
E_NOTFOUND=2
E_NOPID=3
E_LOCKED=4

if [[ ! -x "$BIN" ]]; then
    echo "$BIN does not exist or is not executable"
    exit $E_NOTFOUND
fi

start () {
    if [[ -f "$LOCK_FILE" ]]; then
        echo "Lock file $LOCK_FILE exists. Already running?"
        exit $E_LOCKED
    fi
    echo "Starting $NAME"
    daemonize -c $IFC_PATH -o $LOG_FILE -p $PID_FILE -l $LOCK_FILE $BIN
}

stop () {
    if [[ ! -s "$PID_FILE" ]]; then
        echo "PID file $PID_FILE empty or not found. Not started?"
        exit $E_NOPID
    fi
    PID=$(head -n1 $PID_FILE)
    echo "Stopping $NAME: $PID"
    kill $PID
    rm -f -- $PID_FILE $LOCK_FILE
}

status () {
    if [[ ! -s "$PID_FILE" ]]; then
        echo "$NAME is not running"
    else
        echo "$NAME is running: $(head -n1 $PID_FILE)"
    fi
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        start
        ;;
    status)
        status
        ;;
    *)
        echo "usage: $0 {start|stop|restart|status}"
        exit $E_USAGE
        ;;
esac