#!/bin/sh

usage() {
  cat <<__EOF__
usage: $(basename $0) [-hl] [-u user] [-X args] [-d args]
-h        print this help text
-l        print list of files to download
-u user   download as authenticated user
-X args   extra arguments to pass to xargs
-d args   extra arguments to pass to the download program

__EOF__
}

username=
xargsopts=
prompt=
list=
while getopts hlu:xX:d: option; do
  case $option in
  h)
    usage
    exit
    ;;
  l) list=yes ;;
  u)
    prompt=yes
    username="$OPTARG"
    ;;
  X) xargsopts="$OPTARG" ;;
  d) download_opts="$OPTARG" ;;
  ?)
    usage
    exit 2
    ;;
  esac
done

cat <<__EOF__
      Please note that running this script will result in the entire data collection to be downloaded, i.e. 130.43 GB in 31 files.

      To refine the selection and download, visit the following URL:

           https://archive.eso.org/scienceportal/home?data_collection=Fornax3D

      and specify the relevant additional query constraints.

      Do you want to proceed with running this script (y/N)?
__EOF__

read continue_prompt

if [ "$continue_prompt" != "y" ]; then
  exit 0;
fi

if test -z "$xargsopts"; then
  #no xargs option speficied, we ensure that only one url
  #after the other will be used
  xargsopts='-L 1'
fi

if test -n "$prompt" -a -z "$list"; then
  trap 'stty echo 2>/dev/null; echo "Cancelled."; exit 1' INT HUP TERM
  stty -echo 2>/dev/null
  printf 'Password: '
  read password
  echo ''
  stty echo 2>/dev/null
fi

# use a tempfile to which only user has access
tempfile=$(mktemp /tmp/dl.XXXXXXXX 2>/dev/null)
test "$tempfile" -a -f $tempfile || {
  tempfile=/tmp/dl.$$
  (umask 077 && : >$tempfile)
}
trap 'rm -f $tempfile' EXIT INT HUP TERM

echo "auth_no_challenge=on" >$tempfile
# older OSs do not seem to include the required CA certificates for ESO
echo "check-certificate=off" >>$tempfile
if [ -n "$prompt" ]; then
  echo "--http-user=$username" >>$tempfile
  echo "--http-password=$password" >>$tempfile

fi
WGETRC=$tempfile
export WGETRC

unset password

if test -n "$list"; then
  cat
else
  xargs $xargsopts wget $download_opts
fi <<'__EOF__'
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.574
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.576
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.578
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.580
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.582
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.584
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.586
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.588
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.590
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.592
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.594
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.596
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.598
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.600
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.602
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.604
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.606
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.608
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.610
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.612
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.614
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.616
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.618
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.620
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.622
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.624
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.626
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.628
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.630
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.632
https://dataportal.eso.org/dataPortal/file/ADP.2023-01-17T14:18:11.634
__EOF__