#!/bin/sh

SRC_DIR="$HOME/music"
DEST_DIR="/run/media/$USER/F967-1B77/Music"

die() {
    printf '%s: %s\n' "${0##*/}" "$1" >&2
    exit 1
}

# Check source and destination directories
[ -d "$SRC_DIR" ] || die "no such directory: $SRC_DIR"
[ -d "$DEST_DIR" ] || die "no such directory: $DEST_DIR"

# Sync directories and artwork
rsync -a --include '*/' --exclude '*.flac' "$SRC_DIR/" "$DEST_DIR/"

# Transcode audio
find "$SRC_DIR" -type f -name '*.flac' | while read -r src_file; do
    rel_path="${src_file#"$SRC_DIR"/}"
    dest_path="$DEST_DIR/${rel_path%.*}.opus"

    [ -f "$dest_path" ] || ffmpeg -nostdin -i "$src_file" -c:a libopus -b:a 96k "$dest_path"
done