#Initialize Variables
VERSION="0.0.1"
NETPKGCONF="/etc/netpkg.conf"
INFO=0
LIST=0
OWNS=0

#Test $ROOT to see if it is set, set ROOTDIR accordingly 
if [ -n "$ROOT" ]; then
  ROOTDIR="$ROOT"
else
  ROOTDIR="/"
fi

#Use netpkg configuration values if file exists
if [ -f "$NETPKGCONF" ]; then
  LOGDIR="$(awk '/Package_logs/ {print $3}' <"$NETPKGCONF")"
  DBDIR="$(awk '/Netpkg_dir/ {print $3}' <"$NETPKGCONF")/db"
else #assume some defaults
  LOGDIR="/var/log/packages"
  DBDIR="/var/netpkg/db"
fi

DEPFILE="$DBDIR/depfile"
PKGLIST="$DBDIR/PACKAGES.txt"
MIRROR="$(<$DBDIR/last_mirror)"

#Some Functions
err_msg() {
  echo "$1"
  exit 1
}

usage() {
  echo "Usage: managepkg [options]"
  echo
  echo "Options:"
  echo "  -h, --help            Show this dialog"
  echo "  -i, --info <package>  Display information about package"
  echo "  -l, --list <package>  List all the files in package"
  echo "  -o, --owns <file>     Display which package owns file"
  echo "  -v, --version         Display the version of managepkg"
  echo
  exit 0
}

version_msg() {
  echo "managepkg version: $VERSION"
  exit
}

#Quick error check before I shift out all of the positional parameters
[ "$#" -lt "1" ] && err_msg "Incorrect usage, see managepkg --help."

#Parse options and reset variables accordingly
while [ "$#" -gt "0" ]; do
  param="$1"
  if [ "${param:0:2}" = "--" ]; then
    case "${param:2}" in
      info)    INFO="1" ; PACKAGE="$2" ; shift ;;
      list)    LIST="1" ; PACKAGE="$2" ; shift ;;
      owns)    OWNS="1" ; FILE="$2"    ; shift ;;
      help)    usage       ;;
      version) version_msg ;;
      *)       err_msg "Option \`${param:2}' not recognized, see managepkg --help." ;;
    esac
  elif [ "${param:0:1}" = "-" ]; then
    shortparam="$(sed 's/./& /g' <<<${param:1})"
    for character in $shortparam; do
      case $character in
        i) INFO="1" ; PACKAGE="$2" ; shift ;;
        l) LIST="1" ; PACKAGE="$2" ; shift ;;
        o) OWNS="1" ; FILE="$2"    ; shift ;;
        h) usage       ;;
        v) version_msg ;;
        *) err_msg "Option \`$character' not recognized, see managepkg --help." ;;
      esac
    done
  else
    err_msg "Error when parsing \`$param', see managepkg --help."
  fi
  shift
done

#Universal error checks
[ "$((INFO+LIST+OWNS))" -ne "1" ] && err_msg "Must have only one option selected."
[ "${PACKAGE:0:1}" = "-" ]        && err_msg "Package must directly follow option."
[ "${FILE:0:1}" = "-" ]           && err_msg "File must directly follow option."