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

OUT_DIR="${1:?usage: collect_backup_restore_drill.sh <out_dir>}"
mkdir -p "$OUT_DIR"

ROOT="../vm-skills"
LATEST="$(find "$ROOT" -type f -name "*restore*drill*.json" 2>/dev/null | sort | tail -n 1 || true)"

file_mtime_epoch() {
  local file="$1"
  if stat -c %Y "$file" >/dev/null 2>&1; then
    stat -c %Y "$file"
  else
    stat -f %m "$file"
  fi
}

file_mtime_iso() {
  local file="$1"
  local mtime
  mtime="$(file_mtime_epoch "$file")"
  if date -u -r "$file" "+%Y-%m-%dT%H:%M:%SZ" >/dev/null 2>&1; then
    date -u -r "$file" "+%Y-%m-%dT%H:%M:%SZ"
  elif date -u -d "@${mtime}" "+%Y-%m-%dT%H:%M:%SZ" >/dev/null 2>&1; then
    date -u -d "@${mtime}" "+%Y-%m-%dT%H:%M:%SZ"
  else
    date -u "+%Y-%m-%dT%H:%M:%SZ"
  fi
}

if [[ -n "$LATEST" && -f "$LATEST" ]]; then
  TS="$(file_mtime_iso "$LATEST")"
  cat > "$OUT_DIR/backup_restore_drill.json" <<JSON
{"collected": true, "path": "$LATEST", "observed_at": "$TS"}
JSON
else
  cat > "$OUT_DIR/backup_restore_drill.json" <<'JSON'
{"collected": false, "reason": "no restore drill artifacts found"}
JSON
fi