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#! /bin/bash

libdir=@LIBDIR@/backup
set -e
. $libdir/common.sh
set +e

load_config
taroptions="$backup_tar_options $backup_rsh_command"

# Options
root=/
verbose=
logfile=
dry_run=
listonly=
confirm=1

guess_round() {
  case $1 in
  Sun|Mon|Tue)
    round=0;;
  Wed|Thu)
    round=1;;
  Fri|Sat)
    round=2;;
  *)
    echo >&2 "$0: invalid day of week ($1)"
    exit 1
  esac		     		       
}

guess_level() {
  case $1 in
  Sun)
    level=0;;
  Mon|Wed|Fri)
    level=1;;
  Tue|Thu|Sat)
    level=2;;
  *)
    echo >&2 "$0: invalid day of week ($1)"
    exit 1
  esac		     		       
}

getyn() {
  echo -n "$0:" $* " [Y/n]? "
  read
  case $REPLY in
  ''|y*|Y*) REPLY=y;;
  *) REPLY=n;;
  esac
}

help() {
  cat <<EOT
usage: restore [OPTIONS] [ITEM [ITEM...]]
restores this system from a backup

OPTIONS:
  -c, --confirm        do not ask for confirmation; run straight into restoring
  -C, --directory DIR  restore into directory DIR instead of $root
  -v, --verbose        increase verbosity
  -n, --dry-run        do nothing, print what would have been done
  -t, --list           list archives, instead of extracting
  -l, --logfile FILE   log to FILE
  -L, --level N        set incremental dump level to stop at
  -R, --round N        use archives from incremental round N
  -W, --week N         use archives from week N
  -h, --help           produce this help list

Valid ITEMs are: $backup_items
EOT
  exit 0
}

while [ $# -ne 0 ]
do
  case $1 in
  -C|--directory) shift; root=$1;;
  -c|--confirm) confirm=0;;
  -v|--verbose) verbose="$verbose -v";;
  -t|--list) listonly=1;;
  -l|--logfile) shift; logfile=$1; confirm=0;;
  -n|--dry-run) dry_run=echo;;
  -h|--help) help;;
  -L|--level) shift; level=$1;;
  -R|--round) shift; round=$1;;
  -W|--week) shift; week=$1;;
  --) shift; break;;
  -*) echo >&2 "$0: unrecognized option $1"; exit 1;;
  *) break;;
  esac
  shift
done

if [ -z "$listonly" ]; then
  taroptions="$taroptions -x"
else
  taroptions="$taroptions -t"
fi    

# Collect items to be restored.
items=$*

test -z "$items" && items="$backup_items"

if [ -n "$logfile" ]; then
  confirm=0
  exec >>$logfile
  exec 2>&1
fi        

# Verify option consistency, guess missing values
hour=$(date +%H)
if [ $hour -gt 6 ]; then
  thisweek=$(date +%U)
  yestreen=$(date +%a)
else  
 thisweek=$(date -d yesterday +%U)
 yestreen=$(date -d yesterday +%a)
fi

if [ -z "$week" ]; then
  week=$thisweek
fi
if [ -z "$round" ]; then
  if [ $week = $thisweek ]; then
    guess_round $yestreen
  else
    round=2
  fi
fi
if [ -z "$level" ]; then
  if [ $week = $thisweek ]; then
    guess_level $yestreen
  else
    # FIXME: A better guess?
    level=2        
  fi
fi

echo "$0: target root directory $root"
echo "$0: items to be restored: $items"
echo "$0: restoring from week $week, round $round, level $level"

if [ $confirm -ne 0 ]; then
  getyn "Do you wish to proceed"
  test $REPLY = "n" && exit 0
fi

$prologue_hook

logit "started"

for item in $items
do
  eval type=\$${item}_type
  ${type}_restore $item
done

$epilogue_hook

logit "finished"


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