#!/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}"

export LANG=C
export LC_ALL=C
export LC_TIME=C
year=`date -d "$daysago days ago 00:00:00" +%Y`
month=`date -d "$daysago days ago 00:00:00" +%m`
day=`date -d "$daysago days ago 00:00:00" +%d`

part=`curl -s "http://explosm.net/comics/archive/$year/$month" | sed -nre "s#.+/comics/([0-9]+)/?\">$year.$month.$day.+#\1#p"`
if [ -z "$part" ]; then
	echo "Cyanide and Happyness: Kein Comic für $year, $month $day"
	rm -rf "${tmp}"
	exit
fi

htmladdress="http://explosm.net/comics/$part"
echo "Cyanide and happyness: $htmladdress gefunden"

browser="Mozilla/4.06 [en] (X11; I; Linux 2.0.35 i586)"

echo "Lese URL von $htmladdress"
url=$(wget ${wget_args} -O - --user-agent="$browser" "$htmladdress" | grep -oE 'files.explosm.net/comics/[^"]+' | head -n1)

if [ -n "$url" ]; then
	url="http://$url"
	echo "Dateiname: $url"
	echo "Hole cyanide and happyness für Datum: $(date -d"$daysago days ago" -I)"

	wget ${wget_args} --user-agent="$browser" -O "$day.png" "$url"

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

rm -rf "${tmp}"