// Create the `purchases` + `purchase_lines` PocketBase collections.
//
// A purchase order is money COMING IN against a machine: parts, repairs, servicing.
// Invoices are money coming in against a SITE, so the two are deliberately separate
// collections even though both carry a PDF, a supplier and lines.
//
// The join is the COST CODE on each line: it is the machine code as the client types it
// on the PO ("TLB06", or "SS-02"), and it is what allocates the spend to a plant item.
// A line whose cost code is not in the register is NOT booked and is reported — never
// guessed at a machine, and never booked to nothing without saying so.
//
// Idempotent: safe to re-run.
//
// Usage: node scripts/setup-purchase-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;
  }
  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");

const purchasesId = await ensureCollection("purchases", [
  { name: "po_no", type: "text", required: true },
  { name: "supplier", type: "text" },
  { name: "supplier_code", type: "text" },
  { name: "po_date", type: "text" },
  { name: "required_by", type: "text" },
  { name: "req_no", type: "text" },
  { name: "currency", type: "text" },
  { name: "subtotal", type: "number" },
  { name: "vat", type: "number" },
  { name: "total", type: "number" },
  // The uploaded PO. Held on the record so a reader can check any figure against the
  // source without asking for the file again — see AGENTS.md on invoices.
  { name: "source_pdf", type: "file", maxSelect: 1, maxSize: 20971520 },
  { name: "source_file", type: "text" },
  // Declared explicitly: PocketBase does NOT add these to a collection created
  // through the collections API, and the page sorts by `-created`.
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

await ensureCollection("purchase_lines", [
  { name: "purchase", type: "relation", required: true, collectionId: purchasesId, minSelect: 1, maxSelect: 1, cascadeDelete: true },
  { name: "line_no", type: "number", required: true },
  { name: "material_code", type: "text" },
  // Exactly as printed on the PO, hyphenation and all ("SS-02"), so the document can
  // still be checked line by line.
  { name: "cost_code", type: "text" },
  // Where the spend lands. EMPTY means the cost code was not in the plant register —
  // that is a real state worth seeing, not a zero and not a guess.
  { name: "asset", type: "relation", collectionId: assetsId, minSelect: 1, maxSelect: 1, cascadeDelete: false },
  { name: "description", type: "text" },
  { name: "qty", type: "number" },
  { name: "rate", type: "number" },
  { name: "disc_pct", type: "number" },
  { name: "vat_pct", type: "number" },
  { name: "amount_excl", type: "number" },
  { name: "vat", type: "number" },
  { name: "total_incl", type: "number" },
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

console.log("\n✓ purchases ready. Usage: upload POs from /running/purchases");
process.exit(0);