#!/bin/bash

# script to fix where flac tags are set correctly but navidrome still sees them as having [Unknown album] and [Unknown artist]
# usage: fix_unknown_album_and_artist_flac_file.sh FILENAME [LOCATION] [-l]
# parameters:
# 	FILENAME: 		file to fix. Can be a relative or absolute path
# 	LOCATION: 		optional, location of the file, if the script is run from a different directory than where the file to fix is.
#	-l LISTFILE:	optional, location of file containing multiple files to fix, each starting with a new line. 
#					This is the same as running the script for each single file in the list


function fix_flac_file()
{
	if [ -z "$1" ]
	then
		echo "Line is empty. Skipping"
		return
	fi
	
	echo "Fixing flac file $1"

	echo "running command ffmpeg -i $1 -c:a flac -map_metadata 0 fixed.flac"

	if ffmpeg -nostdin -i "$1" -c:a flac -map_metadata 0 fixed.flac
	then
		echo "Moving fixed.flac to $1"
		mv fixed.flac "$1"
	else
		echo "Failed to process $1" >&2
		rm -f fixed.flac
	fi
}

function print_help()
{
	echo "script to fix where flac tags are set correctly but navidrome still sees them as having [Unknown album] and [Unknown artist]"
	echo "usage: fix_unknown_album_and_artist_flac_file.sh FILENAME [LOCATION] [-l]"
	echo "parameters:"
 	echo -e "\tFILENAME: 		file to fix. Can be a relative or absolute path"
 	echo -e "\tLOCATION: 		optional, location of the file, if the script is run from a different directory than where the file to fix is."
	echo -e "\t-l LISTFILE:	optional, location of file containing multiple files to fix, each starting with a new line. "
	echo -e "\tThis is the same as running the script for each single file in the list"
}

if [ -z "$1" ]
then
	echo "use the -h flag to get help on how to use this script"
	exit 0
fi

if [ "$1" = "-h" ]
then
	print_help
	exit 0
fi
if [ -z "$2" ]
then
	echo "staying in current directory"
else
	
	if [ "$1" = "-l" ]
	then
		echo "Looping through $2"
		# Use IFS= and -r with read so backslashes and leading/trailing whitespace are preserved
		while IFS= read -r flacfile; do
			echo "Processing line $flacfile"
			fix_flac_file "$flacfile"
		done < "$2"
		exit 0;
	else
		echo "moving to $2"
			cd "$2"
	fi
fi

fix_flac_file "$1"