#!/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. 98.01 GB in 28 files.

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

           https://archive.eso.org/scienceportal/home?data_collection=197.A-0384

      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.2022-10-27T12:06:36.781
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.783
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.785
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.787
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.789
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.791
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.793
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.795
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.797
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.799
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.801
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.803
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.805
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.807
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.809
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.811
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.813
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.815
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.817
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.819
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.821
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.823
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.825
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.827
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.829
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.831
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.833
https://dataportal.eso.org/dataPortal/file/ADP.2022-10-27T12:06:36.835
__EOF__