#!/bin/bash

source "$MIAOU_BASH_DIR"/lib/functions.sh

function usage {
    local BASECMD
    BASECMD=$(basename "$0")
    echo "usage: $BASECMD <packages...>"
    case $(os-release) in
    debian)
        echo 'idempotent debian package installation : update if necessary, install only if not yet done'
        ;;
    arch)
        echo 'idempotent archlinux package installation : update if necessary, install only if not yet done'
        ;;
    esac

    exit 1
}

[ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 2
[[ $# -lt 1 ]] && usage

case $(os-release) in
debian)
    if [ "$(date --date='-12 hours' +%s)" -gt "$(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s)" ]; then
        echo "updating repositoring..."
        apt-get update
    fi

    for i in "$@"; do
        if ! dpkg -l "$i" 2>/dev/null | grep -q ^ii; then
            sudo apt-get install -y "$i"
        elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
            echo "apt package <$i> already installed!"
        fi
    done
    ;;
arch)
    for i in "$@"; do
        if ! pacman -Ql "$i" 2>/dev/null | grep -q ^ii; then
            sudo pacman -Sy "$i"
        elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
            echo "pacman package <$i> already installed!"
        fi
    done
    ;;
*)
    echo "unknown os release <$(os-release)>!" && exit 2
    ;;
esac