#!/bin/bash
# 
# encode.bash - Drives a set of encoders and tagging utilities to convert a
# single WAV input file into flac, Ogg Vorbis, AAC and MP3 files with complete
# and consistent metadata.
#
# Copyright (c) 2010, Thomas Gideon
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of Thomas Gideon nor the
#       names of additional contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
function clean {
	if [ -f "$1" ]
	then
		echo "Cleaning existing file, $1."
		rm "$1"
	fi
}

if [ -z "$1" ]
then
	echo "Provide a cast config!"
	echo "$0 <cast config> <slug> [date]"
	exit 1
fi
config=$1
if [ -z "$2" ]
then
	echo "Provide a slug!"
	echo "$0 <cast config> <slug> [date]"
	exit 2
fi
slug="$2"
if [ -z "$3" ]
then
	date=$(date +%Y-%m-%d)
	year=$(date +%Y)
	post_date=$(date +%Y/%m/%d)
else
	date=$(date +%Y-%m-%d -d "$3")
	year=$(date +%Y -d "$3")
	post_date=$(date +%Y/%m/%d -d "$3")
fi

# load info from cast specific config file
. "$config"

if [ -z "$file_prefix" ]
then
	echo "${config} must set file_prefix."
	exit 1
fi

echo "Info for tagging."
echo "Title:      $title"
echo "Artist:     $artist"
echo "Cover:      $cover"
echo "Album:      $album"
echo "Genre:      $genre"
echo "URL:        $url"
echo "Copyright:  $copyright"
echo "Comment:    $comment"

base_file=${file_prefix}${date}

echo ""
echo "Encoding MP3, ${base_file}.mp3 at ${mp3_bitrate} kbps."
clean "${base_file}.mp3"
echo ""
# encode lossy, MP3, adding ID3v2 tags for everything
# *except* cover art
lame -b "${mp3_bitrate}" \
--cbr \
--tt "${title}" \
--ta "${artist}" \
--tl "${album}" \
--ty "${year}" \
--tc "${comment}" \
--tg "${genre}" \
--id3v2-only \
--noreplaygain \
"${base_file}".flac \
"${base_file}".mp3

# lame package from Lucid lacks the --ti switch for image
# found eyed3 via a web search
eyeD3 --add-image "${cover}":FRONT_COVER \
--url-frame="WCOP:${copyright}" \
"${base_file}".mp3

echo ""
echo "Tagging ${base_file}.flac."
echo ""
# lossless encoding
metaflac \
--import-picture-from="|image/png|||${cover}" \
--set-tag=title="${title}" \
--set-tag=artist="${artist}" \
--set-tag=album="${album}" \
--set-tag=year="${year}" \
--set-tag=genre="${genre}" \
--set-tag=composer="${artist}" \
--set-tag=comment="${comment}"  \
--set-tag=url="${url}"  \
--set-tag=copyright="${copyright}"  \
"${base_file}".flac