/**
 * One-shot migration: fields for the Delivery Pool.
 *
 *   order_items.delivery_driver       relation → users (single)
 *   order_items.delivery_assigned_at  date
 *
 * Kept apart from `drv_id` / `assigned_at` so assigning a delivery never
 * overwrites the driver who collected the goods.
 *
 * Run with:
 *
 *     npm run pb:migrate:delivery-pool
 *
 * Idempotent — fields that already exist are skipped. Manual step on the
 * live PB (like select values and pb_hooks), BEFORE deploying the page.
 *
 * Rollback: delete the fields in the PB admin UI.
 */
import "./_env-loader";
import PocketBase from "pocketbase";

const PB_URL = process.env.NEXT_PUBLIC_POCKETBASE_URL || process.env.PB_URL || "http://127.0.0.1:8090";
const ADMIN_EMAIL = process.env.PB_ADMIN_EMAIL;
const ADMIN_PASSWORD = process.env.PB_ADMIN_PASSWORD;

type FieldDef = Record<string, unknown> & { name: string };

async function main() {
  if (!ADMIN_EMAIL || !ADMIN_PASSWORD) {
    throw new Error("Set PB_ADMIN_EMAIL and PB_ADMIN_PASSWORD (e.g. from .env.local).");
  }
  const pb = new PocketBase(PB_URL);
  await pb.collection("_superusers").authWithPassword(ADMIN_EMAIL, ADMIN_PASSWORD);
  console.log(`[delivery-pool] Authenticated against ${PB_URL}`);

  const users = await pb.collections.getOne("users");
  const wanted: FieldDef[] = [
    {
      name: "delivery_driver",
      type: "relation",
      required: false,
      presentable: false,
      collectionId: users.id,
      cascadeDelete: false,
      minSelect: 0,
      maxSelect: 1,
    },
    { name: "delivery_assigned_at", type: "date", required: false, presentable: false },
  ];

  const collection = await pb.collections.getOne("order_items");
  const existing = new Set(collection.fields.map((f: { name: string }) => f.name));
  const missing = wanted.filter((f) => !existing.has(f.name));
  for (const f of wanted) {
    if (existing.has(f.name)) console.log(`[delivery-pool] order_items.${f.name} already exists — skipping.`);
  }
  if (missing.length > 0) {
    await pb.collections.update(collection.id, { fields: [...collection.fields, ...missing] });
    for (const f of missing) console.log(`[delivery-pool] order_items.${f.name} added.`);
  }
  console.log("[delivery-pool] Done.");
}

main().catch((err) => {
  console.error("[delivery-pool] Migration failed:", err);
  process.exit(1);
});