#!/bin/bash

if [[ $# -ne 3 || ( "$1" != "backup" && "$1" != "restore") ]]; then
    echo "Usage: $0 [backup|restore] source destination"
    exit 1
fi

date=`date "+%Y-%m-%d-%H-%M-%S"`
SRC="$2"
DST="$3"

if [ ! -d "$SRC" ]; then
    echo "$SRC" is not a directory or does not exist
    exit 1
fi
if [ ! -d "$DST" ]; then
    echo "$DST" is not a directory or does not exist
    exit 1
fi

function rsync_backup() {
    # $1 = SRC, $2 = DST, $3 = date
    SRC="$1"
    DST="$2"
    date="$3"

    rsync --recursive --links --perms --times --group --owner --devices --specials --verbose --delete --numeric-ids \
    --exclude={/dev/*,/proc/*,/mnt/*,/media/*,/sys/*,/tmp/*,/run/*,/home/*/.gvfs,/home/*/.cache,/var/lib/pacman/sync/*,/var/cache/pacman/pkg/*,/home/*/tmp/*,/home/*/VirtualBox\ VMs,/home/*/.dbus,/swapfile,/home/*/.thumbnails,/home/*/.wine,/home/*/.davfs2/cache,/home/*/.gksu.lock,/home/*/.gmrun_history,/home/*/Downloads/*,/home/*/.local/share/Trash} \
    --link-dest="`readlink -f "$DST"`/Latest" \
    $SRC $DST/Processing-$date \
    && cd $DST \
    && mv Processing-$date $date \
    && rm -f Latest \
    && ln -s $date Latest
}

function rsync_restore() {
    # $1 = SRC, $2 = DST, $3 = date
    SRC="$1"
    DST="$2"
    date="$3"

    rsync --recursive --links --perms --times --group --owner --devices --specials --verbose --delete --numeric-ids \
    $SRC $DST
}

if [[ $1 == "backup" ]]; then
    rsync_backup $SRC $DST $date
fi
if [[ $1 == "restore" ]]; then
    rsync_restore $SRC $DST $date
fi

exit 0