#!/bin/sh
checkMetadata() {
	ffprobe "$1" 2>&1 | grep -ie artist -e title
	while true; do
		printf "correct metadata? [Y] | [n]: "
		read -r yn < /dev/tty
		case "$yn" in
			[Yy]* ) return 0;;
			[Nn]* ) return 1;;
			* ) echo "Please answer yes or no.";;
		esac
	done
}
download_dir="$(mktemp -d)"
temp_dir="$(mktemp -d)"
for song in "$@"; do
	file_name="$(youtube-dl "ytsearch:$song lyrics" \
		-f bestaudio/best \
		--output "$download_dir/%(title)s.%(ext)s" \
		--metadata-from-title "%(artist)s - %(title)s" \
		--add-metadata \
		|awk '$1 == "[download]" && $2 == "Destination:" {print substr($0, index($0,$3))}')"
			case "$(echo "$file_name" | awk -F . '{print $NF}')" in
				"webm")
					new_filename="${file_name%.*}".opus
					mkvextract tracks "$file_name" "0:$new_filename" > /dev/null
					file_name="$new_filename"
					;;
				"m4a")
					;;
				*)
					echo "unsupported file type"
					exit 1
					;;
			esac
			r128gain "$file_name" 2> /dev/null
			temp_file="$temp_dir/$(basename "$file_name")"
			cp "$file_name" "$temp_file"
			idntag "$temp_file"
			temp_file=$(echo "$temp_dir"/*)
			if checkMetadata "$temp_file"; then
				mv "$temp_file" .
			elif checkMetadata "$file_name"; then
				mv "$file_name" .
			else
				echo "enter it manually"
			fi
		done
rm -rf "$temp_dir" "$download_dir"
mpc update > /dev/null