#!/usr/bin/env bash
set -euo pipefail

TARGET="${1:-02_audio}"

if ! command -v ffprobe >/dev/null 2>&1; then
  echo "ffprobe is required. Install it with: sudo apt install -y ffmpeg" >&2
  exit 1
fi

if [[ ! -e "$TARGET" ]]; then
  echo "Path not found: $TARGET" >&2
  exit 1
fi

find "$TARGET" -type f \( -iname '*.mp3' -o -iname '*.wav' -o -iname '*.m4a' \) -print0 |
  sort -z |
  while IFS= read -r -d '' file; do
    duration="$(ffprobe -v error -show_entries format=duration -of default=nw=1:nk=1 "$file")"
    printf '%8.3fs  %s\n' "$duration" "$file"
  done