// Create the `invoices` + `invoice_lines` PocketBase collections.
//
// Idempotent: safe to re-run. Creates what is missing and reports drift instead of
// silently leaving a half-shaped schema behind (the project fails loudly rather than
// inventing data — see AGENTS.md).
//
// Usage: node scripts/setup-invoice-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");

// Mirror the rules the existing collections use so behaviour stays uniform.
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 {
      // Grow the existing schema rather than refusing: the collection is additive and
      // re-seeding rewrites its rows anyway. Report exactly what was added.
      await updateSchema(name, (cur) => [...cur, ...missing], `added to ${name}: ${missing.map((f) => f.name).join(", ")}`);
    }
    return existing[0].id;
  }
  // NOTE: pb.collections.create() serialises an array schema into repeated `fields=`
  // params, which PocketBase rejects with "invalid formatting". The collections API
  // wants `fields` as one real JSON array inside a JSON body — so post it directly
  // with a pre-stringified body, which the SDK passes through untouched.
  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;
}

// Adds one field to an existing collection if it is not there yet. PocketBase has no
// partial field API — the schema is replaced wholesale — so the current field list is
// read back and re-sent with the new field appended.
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}`);
}

async function ensureField(collectionName, field) {
  await updateSchema(
    collectionName,
    (fields) => (fields.some((f) => f.name === field.name) ? fields : [...fields, field]),
    `added ${collectionName}.${field.name}`
  );
}

// Drops fields that a previous version of the script created and that are no longer
// part of the model. Explicit list only — never prune anything else.
async function dropField(collectionName, ...names) {
  await updateSchema(
    collectionName,
    (fields) => fields.filter((f) => !names.includes(f.name)),
    `dropped ${collectionName}.${names.join(", ")}`
  );
}

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

const sitesId = await ensureCollection("sites", [
  { name: "name", type: "text", required: true },
  { name: "code", type: "text" },
  { name: "notes", type: "text" },
  { name: "is_active", type: "bool" },
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

const invoicesId = await ensureCollection("invoices", [
  { name: "invoice_no", type: "text", required: true },
  { name: "invoice_date", type: "date", required: true },
  { name: "order_no", type: "text" },
  { name: "debtor", type: "text" },
  { name: "debtor_no", type: "text" },
  { name: "period_from", type: "date" },
  { name: "period_to", type: "date" },
  { name: "description", type: "text" },
  { name: "site", type: "text" },
  { name: "section", type: "text" },
  { name: "category", type: "text" },
  { name: "currency", type: "text" },
  { name: "vat_reg_no", type: "text" },
  { name: "source_file", type: "text" },
  { name: "subtotal", type: "number" },
  { name: "escalation", type: "number" },
  { name: "vat", type: "number" },
  { name: "vat_pct", type: "number" },
  { name: "total_excl", type: "number" },
  { name: "total_incl", type: "number" },
  // Original document, uploaded from the Invoices page (drag-and-drop).
  { name: "source_pdf", type: "file", maxSelect: 1, maxSize: 20971520 },
  { name: "booked_month", type: "number" },
  { name: "booked_year", type: "number" },
  { name: "is_booked", type: "bool" },
]);

const invoiceLinesId = await ensureCollection("invoice_lines", [
  { name: "invoice", type: "relation", required: true, collectionId: invoicesId, minSelect: 1, maxSelect: 1, cascadeDelete: true },
  { name: "line_no", type: "number", required: true },
  { name: "machine_code", type: "text" },
  { name: "asset_code", type: "text" },
  { name: "description", type: "text" },
  { name: "qty", type: "number" },
  { name: "unit", type: "text" },
  { name: "rate", type: "number" },
  { name: "rate_type", type: "text" },
  { name: "amount_excl", type: "number" },
  { name: "vat", type: "number" },
  { name: "total_incl", type: "number" },
  // The machine this line is actually booked against. Deliberately nullable: an
  // invoice line whose target asset is unresolved must stay visibly unbooked
  // rather than be silently charged to a guess.
  { name: "booked_asset", type: "relation", collectionId: assetsId, minSelect: 1, maxSelect: 1, cascadeDelete: false },
  { name: "booked_month", type: "number" },
  { name: "booked_year", type: "number" },
]);

// A line can be booked to a SITE when no plant item matches it — the container codes
// (MPLANT04/MPLANT05) are the live case, since the register has no such machine.
// Exactly one of booked_asset / booked_site is expected; a line holding neither is
// what surfaces as unbooked.
await ensureField("invoice_lines", {
  name: "booked_site",
  type: "relation",
  collectionId: sitesId,
  minSelect: 1,
  maxSelect: 1,
  cascadeDelete: false,
});

// Provenance back-reference. `npm run seed` wipes monthly_income, so posting an
// invoice has to be re-runnable without double-counting. Marking each posted row with
// the invoice line it came from makes booking idempotent and auditable: a row with an
// empty `invoice_line` is workbook data, a row with one is invoice-derived.
// The intake inbox. Every PDF that is offered to the app lands here first, with the
// outcome of its parse. Anything that does not reconcile stays as `failed` with the
// reason recorded, so it can be reviewed and retried rather than silently lost.
await ensureCollection("invoice_intake", [
  { name: "file_name", type: "text" },
  { name: "file_size", type: "number" },
  { name: "invoice_no", type: "text" },
  { name: "status", type: "select", required: true, maxSelect: 1, values: ["imported", "failed"] },
  { name: "error", type: "text" },
  // Extracted-but-unverified data, kept so a failed import can still be inspected.
  { name: "parsed", type: "json" },
  { name: "source_pdf", type: "file", maxSelect: 1, maxSize: 20971520 },
  { name: "invoice", type: "relation", collectionId: invoicesId, minSelect: 1, maxSelect: 1, cascadeDelete: false },
  // Collections created through the API do NOT get PocketBase's automatic created/updated
  // fields the way the UI wizard adds them. Without these, any `sort: "-created"` fails
  // server-side with "Something went wrong while processing your request".
  { name: "created", type: "date", onCreate: true, presentable: false },
  { name: "updated", type: "date", onUpdate: true, presentable: false },
]);

await ensureField("monthly_income", {
  name: "invoice_line",
  type: "relation",
  collectionId: invoiceLinesId,
  minSelect: 1,
  maxSelect: 1,
  cascadeDelete: false,
});

// `escalation_pct` and `escalation_amount` came from a misreading of the source PDF:
// the R24,205.13 column is literally headed "PLUS VAT", and the Escalation column is
// R0.00 on every line. Superseded by vat_pct / vat.
await dropField("invoices", "escalation_pct");
await dropField("invoice_lines", "escalation_amount");

console.log("\n=== Summary ===");
console.log(`invoices        ${invoicesId}`);
console.log(`invoice_lines   -> invoices (cascade delete)`);
console.log(`invoice_lines   -> assets    (booked_asset)`);
if (process.exitCode) {
  console.error("\n✗ Schema drift detected — see above.");
} else {
  console.log("\n✅ Invoice collections ready");
}