#!/bin/bash

# Copyright 2013 SUSE Linux Products GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

set -eu
set -o pipefail

EXTRA_ARGS=""
MAP_ELEMENT=""

SCRIPTNAME=$(basename $0)
function show_options () {
    echo "Usage: $SCRIPTNAME [package ...]"
    echo
    echo "Options:"
    echo "    -u          -- update all packages"
    echo "    -d          -- download the packages only"
    echo "    -m          -- use custom element package map (Example: -m nova)"
    exit 0
}

function run_zypper() {
    # TODO: Uncertain if this can ever block wanting input from user
    zypper --non-interactive --gpg-auto-import-keys "$@"
}

TEMP=$(getopt -o hudem: -n $SCRIPTNAME -- "$@")
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -u) run_zypper dist-upgrade; exit 0;;
        -d) EXTRA_ARGS="--download-only"; shift;;
        -m) MAP_ELEMENT=$2; shift 2;;
        -h) show_options;;
        --) shift; break ;;
        *) echo "Error: unsupported option $1."; exit 1;;
    esac
done

# Packages that aren't available in the distro but requested for installation
# can be ignored by adding them to the exclude list
BLACKLIST=('')
WHITELIST=('')

for i in "$@"
do
    PKG_NAME=$i
    if [ -n "$MAP_ELEMENT" ]; then
        if !  PKG_NAME=$(pkg-map --element $MAP_ELEMENT $i); then
            echo "bin/pkg-map error. $PKG_NAME"
            exit 1
        fi
    fi
    if [[ ! ${BLACKLIST[*]} =~ $PKG_NAME ]]; then
        WHITELIST+="$i "
    else
        echo "The package $i is not available and will not be installed"
    fi
done

if [ -n "$WHITELIST" ]; then
    if [ -n "$MAP_ELEMENT" ]; then
        if ! PKGS=$(pkg-map --element $MAP_ELEMENT $WHITELIST); then
            echo "bin/pkg-map error. $PKGS"
            exit 1
        fi
    else
        PKGS=$(map-packages $WHITELIST)
    fi
    if [ -z "${PKGS}" ]; then
        echo 'No packages need to be installed'
    else
        run_zypper install $EXTRA_ARGS $PKGS
    fi
fi