#!/usr/bin/env node
import fs from "node:fs";
import path from "node:path";
import process from "node:process";
import { backup, DatabaseSync } from "node:sqlite";

const source = path.resolve(process.cwd(), "var", "recipe-book.sqlite");
const requestedTarget = process.argv[2];

if (!requestedTarget) {
  throw new Error("Usage: npm run db:backup -- /path/to/recipe-book.sqlite");
}
if (!fs.existsSync(source)) {
  throw new Error(`Database not found: ${source}`);
}

const target = path.resolve(requestedTarget);
if (target === source) {
  throw new Error("Backup target must differ from the live database.");
}
if (fs.existsSync(target)) {
  throw new Error(`Refusing to overwrite existing backup: ${target}`);
}

fs.mkdirSync(path.dirname(target), { recursive: true });
const database = new DatabaseSync(source, { readOnly: true });
try {
  await backup(database, target);
} finally {
  database.close();
}

console.log(`Backed up ${source} to ${target}`);