// Create the `insurance_rates` PocketBase collection.
//
// WHY A NEW COLLECTION, and not more rows in `cost_lines`:
//   `cost_lines` answers "what did this machine cost in month M" — one row per month.
//   `insurance_rates` answers "what was this machine's PREMIUM during that stretch"
//   — one row per rate PERIOD. They are different grains on purpose, because a
//   premium moves every month or three (client ruling, 2026-10-08) and a monthly
//   table forces you to re-key the same rate twelve times with no way to see when
//   it changed. The monthly `cost_lines` figures are then DERIVED from the rate
//   history, so the premium has exactly one home.
//
// Idempotent: safe to re-run. Mirrors the rules of `monthly_income` so behaviour
// stays uniform, and grows the schema rather than leaving it half-shaped.
//
// Usage: node scripts/setup-insurance-collections.mjs
import PocketBase from "pocketbase";
import { readFileSync, existsSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = resolve(__dirname, "..");

// Load .env.local the same way seed.mjs does — a script whose job is to shape the
// schema cannot fail on a missing URL and report success.
const envPath = resolve(ROOT, ".env.local");
if (!existsSync(envPath)) {
  console.error("✗ .env.local not found. Copy .env.example to .env.local and fill it in.");
  process.exit(1);
}
for (const line of readFileSync(envPath, "utf8").split("\n")) {
  const t = line.trim();
  if (!t || t.startsWith("#")) continue;
  const i = t.indexOf("=");
  if (i > 0) process.env[t.slice(0, i).trim()] = t.slice(i + 1).trim();
}

const PB_URL = process.env.NEXT_PUBLIC_PB_URL;
const EMAIL = process.env.PB_ADMIN;
const PASS = process.env.PB_PASS;
const missing = [];
if (!PB_URL) missing.push("NEXT_PUBLIC_PB_URL");
if (!EMAIL) missing.push("PB_ADMIN");
if (!PASS) missing.push("PB_PASS");
if (missing.length) {
  console.error(`✗ Missing required env: ${missing.join(", ")}`);
  process.exit(1);
}

const pb = new PocketBase(PB_URL);
pb.autoCancellation(false);

console.log(`→ Connecting to ${PB_URL} as ${EMAIL}`);
await pb.collection("_superusers").authWithPassword(EMAIL, PASS);
console.log("  ✓ authenticated");

const reference = await pb.collections.getOne("monthly_income");
const RULES = {
  listRule: reference.listRule,
  viewRule: reference.viewRule,
  createRule: reference.createRule ?? null,
  updateRule: reference.updateRule ?? null,
  deleteRule: reference.deleteRule ?? null,
};
console.log(`  · rules mirrored from monthly_income (list="${RULES.listRule}")`);

const assetsCollection = await pb.collections.getOne("assets");
const assetsId = assetsCollection.id;

async function ensureCollection(name, fields) {
  const existing = await pb.collections.getFullList({ filter: `name = "${name}"`, perPage: 1 });
  if (existing.length) {
    const have = new Set(existing[0].fields.map((f) => f.name));
    const missing = fields.filter((f) => !have.has(f.name));
    if (!missing.length) {
      console.log(`  · ${name} already present (${existing[0].fields.length} fields)`);
    } else {
      await updateSchema(name, (cur) => [...cur, ...missing], `added to ${name}: ${missing.map((f) => f.name).join(", ")}`);
    }
    return existing[0].id;
  }
  // pb.collections.create() serialises an array schema into repeated `fields=`
  // params, which PocketBase rejects. Post the JSON body directly instead.
  const created = await pb.send("/api/collections", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      name,
      type: "base",
      fields,
      listRule: RULES.listRule ?? "",
      viewRule: RULES.viewRule ?? "",
      createRule: RULES.createRule ?? "",
      updateRule: RULES.updateRule ?? "",
      deleteRule: RULES.deleteRule ?? "",
    }),
  });
  console.log(`  ✓ created ${name} (${created.id}) with ${created.fields.length} fields`);
  return created.id;
}

async function updateSchema(collectionName, transform, label) {
  const coll = await pb.collections.getOne(collectionName);
  const next = transform([...coll.fields]);
  if (JSON.stringify(next) === JSON.stringify(coll.fields)) {
    console.log(`  · ${collectionName} schema already current`);
    return;
  }
  await pb.send(`/api/collections/${coll.name}`, {
    method: "PATCH",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ fields: next }),
  });
  console.log(`  ✓ ${label}`);
}

console.log("\n→ Ensuring collections");

await ensureCollection("insurance_rates", [
  // The plant vehicle this premium belongs to. cascadeDelete=true matches
  // `cost_lines` — deleting a machine must take its rate history with it, or the
  // history would outlive the asset it describes.
  { name: "asset", type: "relation", required: true, collectionId: assetsId, minSelect: 1, maxSelect: 1, cascadeDelete: true },
  { name: "year", type: "number", required: true },
  // Inclusive first month of the period. Required — a premium with no start date
  // cannot be resolved against a month, which is the entire point of this table.
  { name: "month_from", type: "number", required: true },
  // Inclusive last month. 0 means OPEN — still the current premium. Never null:
  // a null here would silently read as "unknown", and an unknown end date must not
  // be mistaken for a period that never ends.
  { name: "month_to", type: "number" },
  { name: "rate", type: "number", required: true },
  // The description printed on the rate sheet, kept for provenance.
  { name: "plant", type: "text" },
  { name: "source", type: "text" },
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

console.log("\n✓ insurance_rates ready. Next: npm run seed");
process.exit(0);