#!/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}"

browser="Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0"
date="$(date -d "$daysago days ago" +%Y%m%d)"
newn="${day}.gif"

# get image link
page="http://ars.userfriendly.org/cartoons/?id=${date}"
page_regex="<a href=\"/cartoons/?id=${date}\">"
url_regex='.*<img[^>]*src="\([^"]*\)".*'

img=$(wget ${wget_args} -U "$browser" -O - "${page}" | grep "${page_regex}" | sed "s#${url_regex}#\1#")

if [ -n "${img}" ]; then
    echo "Hole userfriendly von $img"
    echo "fuer Datum: $(date -d"$daysago days ago" -I)"
    echo

    wget ${wget_args} "${img}" -U "$browser" -O "${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
fi

rm -rf "${tmp}"