/**
 * One-shot migration: fields for the AI order assistant.
 *
 *   orders.ai_quote_match                          json  (per-order AI verdict)
 *   order_items.ai_fill                            json  (per-line fill record)
 *   ai_settings.order_assistant_enabled            bool
 *   ai_settings.order_assistant_interval_minutes   number
 *   ai_settings.order_assistant_auto_link          bool
 *   ai_settings.order_assistant_fill_lines         bool
 *   ai_settings.order_assistant_prompt             text  (max 50000)
 *   ai_settings.order_assistant_last_run_at        text  (max 40)
 *   ai_settings.order_assistant_last_run_summary   json
 *
 * Run with:
 *
 *     npm run pb:migrate:order-assistant
 *
 * Idempotent — fields that already exist are skipped. Manual step on the
 * live PB (like select values and pb_hooks).
 *
 * NOTE: PB text fields with `max: 0` cap at 5000 chars, NOT unlimited, so
 * the prompt field gets an explicit max of 50000.
 *
 * The two order-assistant switches default to ON (see the design spec:
 * "Auto-link when sure" is on by default), but a fresh PB bool field
 * starts every existing row at `false`. So the first run that actually
 * adds these fields also seeds the ai_settings row with `true`. A later
 * re-run skips the seeding (the fields already exist), which keeps an
 * operator's deliberate `false` intact.
 *
 * 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;

const TAG = "[order-assistant]";

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

const text = (name: string, max = 500): FieldDef => ({
  name,
  type: "text",
  required: false,
  presentable: false,
  max,
});

const json = (name: string, maxSize: number): FieldDef => ({
  name,
  type: "json",
  required: false,
  presentable: false,
  maxSize,
});

const ORDER_FIELDS: FieldDef[] = [json("ai_quote_match", 65536)];

const ORDER_ITEM_FIELDS: FieldDef[] = [json("ai_fill", 16384)];

const AI_SETTINGS_FIELDS: FieldDef[] = [
  { name: "order_assistant_enabled", type: "bool", required: false, presentable: false },
  { name: "order_assistant_interval_minutes", type: "number", required: false, presentable: false },
  { name: "order_assistant_auto_link", type: "bool", required: false, presentable: false },
  { name: "order_assistant_fill_lines", type: "bool", required: false, presentable: false },
  text("order_assistant_prompt", 50000),
  text("order_assistant_last_run_at", 40),
  json("order_assistant_last_run_summary", 20000),
];

/**
 * Add the fields that don't exist yet. Returns true when at least one
 * field was actually added — the caller uses that to decide whether it
 * is the first run (and may seed the default-on switches).
 */
async function addMissingFields(
  pb: PocketBase,
  collectionName: string,
  wanted: FieldDef[],
): Promise<boolean> {
  const collection = await pb.collections.getOne(collectionName);
  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(`${TAG} ${collectionName}.${f.name} already exists — skipping.`);
    }
  }
  if (missing.length === 0) return false;

  await pb.collections.update(collection.id, {
    fields: [...collection.fields, ...missing],
  });
  for (const f of missing) {
    console.log(`${TAG} ${collectionName}.${f.name} added.`);
  }
  return true;
}

/**
 * Turn the two default-on switches on for the existing ai_settings row.
 * Only called on the first run (when the fields were just added).
 */
async function seedDefaultOnSwitches(pb: PocketBase): Promise<void> {
  const rows = await pb.collection("ai_settings").getFullList<{ id: string }>();
  if (rows.length === 0) {
    console.log(`${TAG} no ai_settings row yet — the code defaults cover it.`);
    return;
  }
  await pb.collection("ai_settings").update(rows[0].id, {
    order_assistant_auto_link: true,
    order_assistant_fill_lines: true,
  });
  console.log(`${TAG} ai_settings: auto-link + fill-lines defaults turned on.`);
}

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(`${TAG} Authenticated against ${PB_URL}`);

  await addMissingFields(pb, "orders", ORDER_FIELDS);
  await addMissingFields(pb, "order_items", ORDER_ITEM_FIELDS);
  const settingsAdded = await addMissingFields(pb, "ai_settings", AI_SETTINGS_FIELDS);
  if (settingsAdded) await seedDefaultOnSwitches(pb);

  console.log(`${TAG} Done.`);
}

main().catch((err) => {
  console.error(`${TAG} Migration failed:`, err);
  process.exit(1);
});