/**
 * One-off ingest: write the 99 NSS hex-nut-DIN934 items from
 * `scripts/nss-fasteners-pb-import.json` into the PocketBase
 * `stock_items` collection.
 *
 * This script reuses the in-app helpers so the writes match what
 * the create route would do:
 *
 *   - `applyDefaultMarkupToPatch`  → seeds `selling_price = cost × 1.80`
 *                                   and `markup = 80` when those are unset
 *                                   (the operator's +80% policy).
 *   - The patch is shaped to mirror `/api/v1/stock/items/create`
 *     exactly, so any later audit ("how did this row get created?")
 *     looks the same whether the row came from the UI or from this
 *     script.
 *
 * Field mapping (CSV row → PB patch):
 *
 *   name         ← PosDescription (e.g. "M48 NUT 8 PLN")
 *   sku          ← SKU
 *   description  ← Description
 *   unit         ← Pack or "Each"
 *   location     ← "NSS Fasteners price list - hex nut DIN934 (Grade 8 + A2)"
 *   notes        ← "Material … | Grade … | Diameter … | Thread … | Finish … | Source …"
 *   supplier     ← "6xuu7a0pmmubtqd"  (NSS supplier relation)
 *   category     ← "4emvaanzogj0586"  (Fasteners category relation)
 *   cost_price   ← parsed UnitPrice number
 *   cost_history ← single entry: { cost_price, quantity:0,
 *                                  purchased_at: today, purchase_id,
 *                                  supplier_id, source, source_url }
 *   selling_price ← computed by helper (cost × 1.80)
 *   markup        ← 80  (computed by helper)
 *   current_qty   ← 0
 *   min_qty       ← 0
 *   target_qty    ← 0
 *   is_active     ← true
 *
 * Why direct `pb.collection(...).create()` and not POST to the API:
 *
 *   The existing `/api/v1/stock/items/create` route is a single-row
 *   endpoint. It doesn't accept `category` (the relation is set
 *   elsewhere) and it would mean 99 separate HTTP round-trips.
 *   For a one-off ingest of a fixed list, calling the admin SDK
 *   directly is simpler and faster. The business logic (`apply
 *   DefaultMarkupToPatch`) is still reused so the rows produced
 *   here are indistinguishable from rows produced by the API.
 *
 * Idempotency:
 *
 *   The script SKIPS records whose `sku` already exists in PB.
 *   Re-running it on the same CSV is safe — it will only create
 *   the rows that haven't been created yet. This means you can
 *   re-run after a partial failure without duplicating anything.
 *
 * Run:
 *   npx tsx scripts/nss-fasteners-ingest.ts --dry-run --limit 5
 *   npx tsx scripts/nss-fasteners-ingest.ts --limit 5          # writes 5 rows
 *   npx tsx scripts/nss-fasteners-ingest.ts                     # writes all 99
 */

import "./_env"; // side-effect import: loads .env.local

import { getAdminPocketBase } from "../src/lib/server/pocketbase-admin";
import {
  applyDefaultMarkupToPatch,
  round2,
} from "../src/lib/server/stock-default-markup-service";
import { readFileSync } from "node:fs";
import { join } from "node:path";

// ─── Constants ────────────────────────────────────────────────────────

const IMPORT_JSON = join(import.meta.dirname, "nss-fasteners-pb-import.json");
const SUPPLIER_NSS_ID = "6xuu7a0pmmubtqd";
const CATEGORY_FASTENERS_ID = "4emvaanzogj0586";
const SOURCE_LABEL =
  "NSS Fasteners price list - hex nut DIN934 (Grade 8 + A2)";
const SOURCE_URL =
  "https://nssfasteners.co.za/nuts/hex-nuts/hex-nut-din934.html?gradematerial=771,773";
const PURCHASE_ID = "nss-price-list-2026-09-16"; // stable ID so re-runs don't append duplicates
const EXTRACTED_AT_ISO = new Date("2026-09-16T08:00:00Z").toISOString();

// ─── CLI flags ────────────────────────────────────────────────────────

const args = process.argv.slice(2);
const dryRun = args.includes("--dry-run");
const limitArg = args.find((a) => a.startsWith("--limit="));
const limit = limitArg ? Number(limitArg.split("=")[1]) : Infinity;

// ─── Types ────────────────────────────────────────────────────────────

type ImportRecord = {
  name: string;
  sku: string;
  description: string;
  location: string;
  notes: string;
  cost_history: Array<{
    price: number;
    currency: string;
    source: string;
    extracted_at: string;
    source_url: string;
    qty_basis: number;
    extraction_method: string;
  }>;
  cost_price: number;
  unit: string;
  current_qty: number;
  min_qty: number;
  target_qty: number;
  is_active: boolean;
  supplier: string;
  category: string;
};

// ─── PB patch builder ─────────────────────────────────────────────────

/**
 * Build the exact patch the create route would build, then run it
 * through `applyDefaultMarkupToPatch` so the +80% markup rule fires
 * the same way it does for any other code path.
 *
 * The output is what `pb.collection("stock_items").create()` will
 * receive. We pass `undefined` for the existing row — there's no
 * row yet (this is the create path).
 */
function buildPatch(r: ImportRecord): Record<string, unknown> {
  // Translate our flat CSV-shaped cost_history into the in-app
  // StockCostHistoryEntry shape, plus provenance fields PB stores
  // opaquely because the field type is `json`.
  const seedEntry = {
    cost_price: r.cost_price,
    quantity: 0,
    purchased_at: EXTRACTED_AT_ISO,
    purchase_id: PURCHASE_ID,
    supplier_id: SUPPLIER_NSS_ID,
    source: "nssfasteners.co.za",
    source_url: SOURCE_URL,
    currency: "ZAR",
    qty_basis: 1,
    extraction_method: "browser_automation",
    notes: SOURCE_LABEL,
  };

  const rawPatch: Record<string, unknown> = {
    sku: r.sku,
    name: r.name,
    description: r.description,
    unit: r.unit,
    location: r.location,
    current_qty: r.current_qty,
    min_qty: r.min_qty,
    target_qty: r.target_qty,
    supplier: r.supplier,
    category: r.category,
    is_active: r.is_active,
    notes: r.notes,
    cost_price: r.cost_price,
    cost_history: [seedEntry], // non-empty → helper won't overwrite
  };

  return applyDefaultMarkupToPatch(rawPatch, undefined);
}

// ─── Existing-SKU lookup (idempotency) ────────────────────────────────

/**
 * Pull every existing `sku` once at the start of the run, then
 * check the in-memory set for each row. Avoids a per-row PB
 * round-trip for the dedupe check.
 *
 * `getFullList` paginates internally, so this works regardless of
 * catalogue size.
 */
async function loadExistingSkus(): Promise<Set<string>> {
  const pb = await getAdminPocketBase();
  const rows = await pb.collection("stock_items").getFullList<{ sku: string }>({
    fields: "sku",
    batch: 500,
  });
  return new Set(rows.map((r) => (r.sku || "").trim()).filter(Boolean));
}

// ─── Main ─────────────────────────────────────────────────────────────

async function main(): Promise<void> {
  const t0 = Date.now();

  const importDoc = JSON.parse(readFileSync(IMPORT_JSON, "utf8")) as {
    records: ImportRecord[];
  };
  const allRecords = importDoc.records;
  const records = Number.isFinite(limit) ? allRecords.slice(0, limit) : allRecords;

  console.log(`Loaded ${allRecords.length} records from ${IMPORT_JSON}`);
  if (records.length < allRecords.length) {
    console.log(`  --limit applied: running on first ${records.length}`);
  }
  console.log(`Mode: ${dryRun ? "DRY RUN (no writes)" : "WRITE"}`);

  // Idempotency: skip SKUs already in PB. Read-only first, then
  // either stop (dry-run) or proceed with the new ones only.
  const existingSkus = await loadExistingSkus();
  console.log(`Existing SKUs in PB: ${existingSkus.size}`);

  const toIngest = records.filter((r) => !existingSkus.has(r.sku));
  const skipped = records.filter((r) => existingSkus.has(r.sku));

  console.log(`Records to ingest: ${toIngest.length}`);
  if (skipped.length > 0) {
    console.log(`Records skipped (already in PB): ${skipped.length}`);
    if (skipped.length <= 10) {
      for (const s of skipped) console.log(`  - ${s.sku}  (${s.name})`);
    }
  }

  if (dryRun) {
    console.log("\nDry run — preview of what would be written:\n");
    let i = 0;
    for (const r of toIngest.slice(0, 5)) {
      const patch = buildPatch(r);
      console.log(
        `  [${++i}] ${patch.sku}  ${patch.name}  cost=R ${patch.cost_price}  sell=R ${patch.selling_price}  markup=${patch.markup}%  cat=${patch.category}`,
      );
    }
    if (toIngest.length > 5) {
      console.log(`  ... and ${toIngest.length - 5} more`);
    }
    console.log(`\n  duration: ${((Date.now() - t0) / 1000).toFixed(1)}s`);
    return;
  }

  // Real write pass.
  const pb = await getAdminPocketBase();
  let created = 0;
  let failed = 0;
  const failures: Array<{ sku: string; error: string }> = [];

  for (const r of toIngest) {
    try {
      const patch = buildPatch(r);
      await pb.collection("stock_items").create(patch);
      created++;
      if (created % 10 === 0 || created === toIngest.length) {
        console.log(
          `  ... ${created}/${toIngest.length} written (last: ${patch.sku})`,
        );
      }
    } catch (err) {
      failed++;
      const message = err instanceof Error ? err.message : String(err);
      failures.push({ sku: r.sku, error: message });
    }
  }

  console.log("\n=== Ingest summary ===");
  console.log(`  Created:   ${created}`);
  console.log(`  Failed:    ${failed}`);
  console.log(`  Skipped:   ${skipped.length} (already in PB)`);
  console.log(`  Duration:  ${((Date.now() - t0) / 1000).toFixed(1)}s`);

  if (failures.length > 0) {
    console.log("\nFailures:");
    for (const f of failures) {
      console.log(`  ${f.sku}  →  ${f.error}`);
    }
    process.exitCode = 1;
  }
}

main().catch((err) => {
  console.error("FATAL:", err);
  process.exit(1);
});