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

PORT="${1:-/dev/cu.usbmodem1101}"
BACKUP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/backups"
TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
TARGET_FILE="${BACKUP_DIR}/nvs_backup_${TIMESTAMP}.bin"

ESPTOOL_BIN="$(which esptool || which esptool.py || echo "${HOME}/.local/bin/esptool.py")"

mkdir -p "$BACKUP_DIR"
echo "Backing up NVS partition (0x9000, 0x5000) to $TARGET_FILE..."
"$ESPTOOL_BIN" --port "$PORT" read_flash 0x9000 0x5000 "$TARGET_FILE"
echo "NVS backup complete: $TARGET_FILE"