#!/bin/bash

# TODO: test for missing/too much arguments, there must be exactly 2

# TODO: make sure the arguments are:
# 1) directories
# 2) existing

function show_time () {
        num=$1
        min=0
        hour=0
        day=0
        if((num>59));then
                ((sec=num%60))
                ((num=num/60))
                if((num>59));then
                        ((min=num%60))
                        ((num=num/60))
                        if((num>23));then
                                ((hour=num%24))
                                ((day=num/24))
                        else
                                ((hour=num))
                        fi
                else
                        ((min=num))
                fi
        else
                ((sec=num))
        fi
        echo "$day"d "$hour"h "$min"m "$sec"s
}

DATE=`date '+%Y%m%d%H%M'`

# TODO: remove potentially trailing slash
SRC=$1
DST=$2

STARTTIME=$(date +%s)

rsync -av --link-dest=../latest $SRC/ $DST/$DATE/

ENDTIME=$(date +%s)

echo "It took $(show_time $(($ENDTIME - $STARTTIME)) ) to complete this task..."

rm $DST/latest
ln -s $DST/$DATE $DST/latest