#! /bin/bash

set -eu -o pipefail

burpconf=/etc/burp/burp.conf
numFiles=2
restoreFolder=/tmp/test_restauration

IFS=$(echo -ne '\b\n')

if [ $# -gt 0 ] ; then
   cmdLine="-C $1"
fi



function _getRandomBurpFolders {
   folderList=$(awk -F " = " '/^include/{ print $2}'  $burpconf)
   echo $folderList | sort --random-sort | tail -n 1
}

function _getRandomBackup {
   burp -a l | awk '{ print $2}' | sort --random-sort | tail -n 1
}

function _cacheStale {
# 1 if given file older than 1 week
# 0 otherwhise
  # file age in seconds = current_time - file_modification_time.
  test -f $1 || return 2
  fileage=$(($(date +%s) - $(stat -c '%Y' "$1")))
  limit=$((7*24*3600))
  diff=$((fileage-$limit ))
  if [ $diff -lt 0 ] ; then return 0 ; else return 1 ; fi
}

function _getRandomFile {
  f=$(_getRandomBurpFolders )
  #f=/home/tom/Documents/Opendoor/Developpement/Scripts/Backups/BurpCheck/Test
  test -d "${f}" || { echo  "error opening $f" ; exit 1 ; }
  cacheFile=/tmp/burp_cache_$(echo $f | md5sum | cut -f1 -d ' ')
  if ( $(_cacheStale "$cacheFile" )) ; then
    readarray -d '' files < <(shuf -z $cacheFile)
   else
      readarray -d '' files < <(find $f -type f -print0 | shuf -z | tee $cacheFile)
   fi
}


backup=$(_getRandomBackup)

_getRandomFile

c=0
for file in "$files" ; do
   let "c+=1"
   echo "$file" | grep -q .git && break
   echo "Trying to restore '${file}' from backup #${backup}"
   burp -a r -b ${backup} -r "${file}" -d ${restoreFolder}
   test $c -eq $numFiles || continue
done

exit $?