#!/bin/bash

# Copyright (C) 2019 Quentin GIBEAUX <quentin@gibeaux.eu>
#
# This file is part of lav-outils from "April/Libre à vous !"
#
# This script is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

usage() { echo "$0 -s source_file -d destination_file -u http://... -t \"title\" -p path/to/ffmpeg/binary"; exit 0; }
[ $# -eq 0 ] && usage
while getopts "s:d:u:t:p:h" arg; do
	case $arg in
		s)
			source=${OPTARG}
			;;
		d)
			destination=${OPTARG}
			;;
		u)
			url=${OPTARG}
			;;
		t)
			title=${OPTARG}
			;;
		p)
			FFmpegBin=${OPTARG}
			;;
		h | *) # Display help.
			usage
			exit 0
		;;
	esac
done

if [ ! -f $source ]; then
	echo "File $source does not exist"
	usage
	exit 1
fi
if [ ! -f "$FFmpegBin" ]; then
	echo "$FFmpegBin is not executable"
	usage
	exit 1
fi

image="lav-outils/podcasts/images/image-pour-etiqueter-podcast.jpg"
fichiertemp="$(command mktemp -t "tmp.XXXXXXXXXX.ogg")"

(echo -en ";FFMETADATA1\nMETADATA_BLOCK_PICTURE=";(i=${image};t=3;m="image/jpeg";eval "w=`identify-im6 "$i"|awk '{g=$3;sub("x"," h=",g);print g;d=$5;gsub(/-.*/,"",d);print " d=" d}'`"; echo -en "\x00\x00\x00\x$(printf '%02x' $t)\x00\x00\x00\x$(printf '%02x' `echo -n "$m"|wc -c`)$m\x00\x00\x00\x00$(printf '%08x' $w|sed 's/../\\x&/g')$(printf '%08x' $h|sed 's/../\\x&/g')$(printf '%08x' $d|sed 's/../\\x&/g')\x00\x00\x00\xff$(printf '%08x' `stat -c '%s' "$i"`|sed 's/../\\x&/g')";cat "$i")|base64 --wrap=0) > i.meta

${FFmpegBin} -y -i ${source} -acodec copy -map 0:0 -map_metadata -1 -metadata title="${title}" -metadata copyright="Diffusée selon les termes d’au moins une des licences suivantes : licence Art libre version 1.3 ou ultérieure http://artlibre.org/licence/lal/, licence Creative Commons By Sa version 2.0 ou ultérieure http://creativecommons.org/licenses/by-sa/2.0/fr/ et licence GNU FDL version 1.3 ou ultérieure http://www.gnu.org/licenses/fdl-1.3.html" -metadata artist="April - Cause Commune" -metadata contact="${url}" ${fichiertemp}

${FFmpegBin} -y -i ${fichiertemp} -i i.meta -acodec copy -map 0:0 -map_metadata 1 ${destination}

rm ${fichiertemp}
rm i.meta