#!/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. 9.53 GB in 6 files.

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

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

      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.2026-01-09T09:33:53.547
https://dataportal.eso.org/dataPortal/file/ADP.2026-01-09T09:33:53.549
https://dataportal.eso.org/dataPortal/file/ADP.2026-01-09T09:33:53.551
https://dataportal.eso.org/dataPortal/file/ADP.2026-01-09T09:33:53.553
https://dataportal.eso.org/dataPortal/file/ADP.2026-01-09T09:33:53.555
https://dataportal.eso.org/dataPortal/file/ADP.2026-01-09T09:33:53.557
__EOF__