#!/usr/bin/env bash

DEFAULT_BASEDIR=$(pwd)
DEFAULT_CONVERTER="ffmpeg"
FLACDIR="flac"
MP3DIR="mp3"

while [[ $# -gt 0 ]]; do
	opt="$1"
	shift;
	case "$opt" in
		"-d"|"--dir")
			BASEDIR="$1"
			shift;
			;;
		"-c"|"--converter")
			CONVERTER="$1"
			shift;
			;;
		"-h"|"--help")
			usage
			;;
	esac
done

if [ -z ${BASEDIR} ]; then
	echo "No Basedir parameter given."
	BASEDIR="${DEFAULT_BASEDIR}"
fi

if [ -z ${CONVERTER} ]; then
	CONVERTER="${DEFAULT_CONVERTER}"
fi

usage() {
	cat<<EOF
Usage: $0 [-d BASEDIR] [-c CONVERTER]

  -d, --dir BASEDIR          The root directory where to start to convert recursively.
	-c, --converter CONVERTER  The converter to use. Choices are "ffmpeg" or "libav"
	-h, --help                 This usage dialog
EOF
exit
}

convert_to_mp3() {
	NUM_FILES=$(find . -type f -iname '*.flac' | wc -l)
	CURRENT=${NUM_FILES}
	IFS=$'\n'; for FLACFILE in $(find ${BASEDIR}/${FLACDIR}/ -type f -iname '*.flac'); do
		SRCPATH=${FLACFILE}
		DSTPATH=$(echo ${FLACFILE} | sed "s|^${BASEDIR}/${FLACDIR}/|${BASEDIR}/${MP3DIR}/|g;s|\.flac$|\.mp3|g")
		SRCDIR=$(dirname "${SRCPATH}")
		DSTDIR=$(dirname "${DSTPATH}")

		if [ ! -d "${DSTDIR}" ]; then
		 	echo "Creating ${DSTDIR}."
			mkdir -p "${DSTDIR}"
		fi

		if [ ! -e "${DSTDIR}/folder.jpg" ]; then
			echo "Copying cover art into ${DSTDIR}."
			cp "${SRCDIR}/folder.jpg" "${DSTDIR}/folder.jpg"
		fi


		if [ ! -e "${DSTPATH}" ]; then
			echo "Converting file ${CURRENT} of ${NUM_FILES}: $(basename $FLACFILE) -> $(basename $DSTPATH)"
			if [ ${CONVERTER} == "libav" ]; then
				# Convert using libav
				avconv -i "${SRCPATH}" -c:a libmp3lame -b:a 192k -map_metadata 0:g:0 "${DSTPATH}"
			elif [ ${CONVERTER} == "ffmpeg" ]; then
				# Convert using ffmpeg
		  	ffmpeg -i "${SRCPATH}" -ab 192k -vcodec copy -map_metadata 0:g:0 -hide_banner -v 0 "${DSTPATH}"
			fi
		fi



		let CURRENT-=1
	done
}

echo "Using ${BASEDIR} as basedir"
echo "  Therefore we are converting from ${BASEDIR}/${FLACDIR} to ${BASEDIR}/${MP3DIR}"
read -p "Press any key to continue... (CTRL+C to abort)" -n1 -s
cd ${BASEDIR}
convert_to_mp3

# vim: set ts=2 sw=2 tw=0 noet :