// Create the `operators` PocketBase collection.
//
// This is TERM 3 of the fixed-expense formula — the operator wage that varies per
// machine per month. It was the last unknown in the workbook's cost model; this sheet
// supplies it.
//
// WHY NOT `cost_lines`: a cost line is "what did this machine cost in month M". An
// operator is a PERSON with a rate who is allocated to a machine, and that allocation
// is what a human changes when someone moves off a machine onto another. Putting the
// link in a per-month cost table would re-key the same person twelve times and lose
// the one field people actually come to update.
//
// cascadeDelete is FALSE on `asset` on purpose: deleting a machine must leave the
// operator on the register as UNASSIGNED, not delete the person.
//
// Idempotent: safe to re-run.
//
// Usage: node scripts/setup-operators-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, "..");

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 assetsId = (await pb.collections.getOne("assets")).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 absent = fields.filter((f) => !have.has(f.name));
    if (!absent.length) {
      console.log(`  · ${name} already present (${existing[0].fields.length} fields)`);
    } else {
      await updateSchema(name, (cur) => [...cur, ...absent], `added to ${name}: ${absent.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");

async function ensureField(collectionName, field) {
  const coll = await pb.collections.getOne(collectionName);
  if (coll.fields.some((f) => f.name === field.name)) {
    console.log(`  · ${collectionName}.${field.name} already present`);
    return;
  }
  await pb.send(`/api/collections/${coll.name}`, {
    method: "PATCH",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ fields: [...coll.fields, field] }),
  });
  console.log(`  ✓ added ${collectionName}.${field.name}`);
}

await ensureCollection("operators", [
  { name: "name", type: "text", required: true },
  { name: "employee_code", type: "text" },
  // Hourly rate as printed on the operator sheet. NOT marked required, for the same
  // reason `financing_terms.installment` is not: PocketBase rejects 0 on a required
  // number, and an unassigned operator still has a rate while an unallocated MACHINE
  // does not. `scripts/seed.mjs` is where the "an operator must have a rate" rule lives.
  { name: "rate", type: "number" },
  // Which plant vehicle this operator is allocated to. Empty = unassigned, which is a
  // normal state on this register (two operators had no machine on the sheet).
  { name: "asset", type: "relation", collectionId: assetsId, minSelect: 1, maxSelect: 1, cascadeDelete: false },
  { name: "source", type: "text" },
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

// MIGRATION: add `on_operator_sheet` to `assets`.
//
// The operator sheet lists TWENTY vehicles. The plant register holds forty-one coded
// machines, the difference being containers, generators and truck trailers that no
// person is ever allocated to. The sheet decides which machines belong on the
// operator register, and the register still supplies their name and code — so the
// scope has to be STORED, not guessed from "has an operator". Three of the twenty
// (TLB01, TLB02, RV01) have nobody on them and must still be listed; inferring from
// the operators collection would drop exactly those three.
await ensureField("assets", {
  name: "on_operator_sheet",
  type: "bool",
  // Not presentable: this is a scope flag set by the seed from data/source/operators.json,
  // never something a person edits.
  presentable: false,
});

// MIGRATION: `rate_set_in_app` on `operators`.
//
// The rate can now be changed from the employee's dashboard (/employees/<person>). The
// seed refreshes `rate` from data/source/operators.json on every run, which would quietly
// put an app-edited rate back to the old sheet value. This flag tells the seed to leave
// that one rate alone.
await ensureField("operators", { name: "rate_set_in_app", type: "bool", presentable: false });

console.log("\n✓ operators ready. Next: npm run seed && node scripts/book-invoice.mjs");
process.exit(0);