#!/bin/bash

if [ -z "$1" -o ! -d "$1" ]; then
    echo "Usage: $0 <top-directory> [<days ago>]" 1>&2
    exit 1
fi

top="${1}"
shift

source "${top}/etc/settings.sh"
tmp="$(mktemp -d)"
cd "${tmp}"

newn="${day}.gif"
month="$(date -d "$daysago days ago" +%m)"
server="http://www.gocomics.com/calvinandhobbes/$year/$month/$day"

nomen="$(wget ${wget_args} "$server" -O - | sed -nre 's#<meta property="og:image" content="([^"]+)".+#\1#p')"

echo "Dateiname: $nomen"
echo
echo "Hole calvinandhobbes von $server"
echo "fuer Datum: $(date -d"$daysago days ago" -I)"
echo

wget ${wget_args} "$nomen" -O "$newn"

if [ -s "${tmp}/${newn}" ]; then
    mv "${tmp}/${newn}" "${image_dir}/$newn"
    rm -f "${comic_dir}/latest.gif"
    ln -s "${image_offset}/$newn" "${comic_dir}/latest.gif"
fi

rm -rf "${tmp}"