#! /bin/sh
set -euf

PUNANI_HOST="${PUNANI_HOST-http://euer.krebsco.de:9111}"
ACTION="$1"; shift
PKGS="$*"

## find package manager
if ! :; then : # dummy case, so the rest has a common format

elif for PACKER_CMD in yum
    do type $PACKER_CMD 2>/dev/null 1>&2 && break; done; then
  INSTALL_PARAM='-y install'
  REMOVE_PARAM='-y remove'

elif for PACKER_CMD in brew
    do type $PACKER_CMD 2>/dev/null 1>&2 && break; done; then
  INSTALL_PARAM='install'
  REMOVE_PARAM='remove'

elif for PACKER_CMD in bauerbill packer yaourt pacman
    do type $PACKER_CMD 2>/dev/null 1>&2 && break; done; then
  INSTALL_PARAM='--noconfirm -S --needed'
  REMOVE_PARAM='-Rcs'

elif for PACKER_CMD in aptitude apt-get
    do type $PACKER_CMD 2>/dev/null 1>&2 && break; done; then
  INSTALL_PARAM='-y install'
  REMOVE_PARAM='-y remove'

else
  echo "Error 2: no known package manager found; no punani for you!" >&2
  exit 23
fi

## find package name
if test -n "$PKGS"; then
  for PKG in $PKGS; do
    RES="`wget -O- $PUNANI_HOST/$PACKER_CMD/$PKG 2>/dev/null || :`"
    if [ ! "$RES" ]; then
      echo "Error 2: could not resolve '$PKG'; no punani for you!" >&2
      exit 23
    fi
    RESOLVED="${RESOLVED+$RESOLVED }$RES"
  done
else
  echo "Error 1: no PACKAGE specified." >&2
  ACTION="usage"
fi

## dispatch
case "$ACTION" in 
  install)
    set -x
    for PKG in $RESOLVED; do
      sudo $PACKER_CMD $INSTALL_PARAM $PKG || echo "Cannot install $PKG!"
    done
    ;;
  remove)
    set -x
    for PKG in $RESOLVED; do
      sudo $PACKER_CMD $REMOVE_PARAM $PKG || echo "Cannot remove $PKG!"
    done
    ;;
  *)
    echo "usage: `basename $0` (install|remove) PACKAGE..."
    exit 23
esac