/**
 * Maps scripts/nss-split-pins-din94-pilot.csv into PocketBase
 * `stock_items` records for review.
 *
 * Output: scripts/nss-split-pins-din94-pb-import.json
 *
 * Run:  npx tsx scripts/nss-split-pins-din94-pb-transform.ts
 */
import { readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";

const SOURCE_CSV = join(
  import.meta.dirname,
  "nss-split-pins-din94-pilot.csv",
);
const OUTPUT_JSON = join(
  import.meta.dirname,
  "nss-split-pins-din94-pb-import.json",
);
const SOURCE_URL =
  "https://nssfasteners.co.za/pins/split-pins/split-pin-din94.html";
const SOURCE_LABEL =
  "NSS Fasteners price list - split pin DIN94";
const EXTRACTED_AT = "2026-09-16";

const SUPPLIER_NSS_ID = "6xuu7a0pmmubtqd";
const CATEGORY_FASTENERS_ID = "4emvaanzogj0586";
const MARKUP_PERCENT = 80;

type CsvRow = {
  sku: string;
  posDescription: string;
  description: string;
  material: string;
  grade: string;
  diameter: string;
  length: string;
  finish: string;
  pack: string;
  unitPrice: string;
  url: string;
};

const parsePrice = (s: string): number | null => {
  const m = s.match(/([\d.]+)/);
  if (!m) return null;
  const n = parseFloat(m[1]);
  return Number.isFinite(n) ? n : null;
};

const round2 = (n: number) => Math.round(n * 100) / 100;

const toPbRecord = (r: CsvRow) => {
  const costPrice = parsePrice(r.unitPrice);
  const notes = [
    `Material: ${r.material}`,
    r.grade ? `Grade: ${r.grade}` : null,
    `Diameter: ${r.diameter}`,
    `Length: ${r.length}`,
    `Finish: ${r.finish}`,
    r.pack ? `Pack: ${r.pack}` : null,
    `Source: ${SOURCE_LABEL}`,
  ]
    .filter(Boolean)
    .join(" | ");

  const costHistory = [
    {
      price: costPrice,
      currency: "ZAR",
      source: "nssfasteners.co.za",
      extracted_at: EXTRACTED_AT,
      source_url: SOURCE_URL,
      qty_basis: 1,
      extraction_method: "browser_automation",
      notes: SOURCE_LABEL,
    },
  ];

  return {
    name: r.posDescription,
    description: r.posDescription,
    sku: r.sku,
    location: SOURCE_LABEL,
    notes,
    cost_history: costHistory,
    cost_price: costPrice,
    selling_price:
      costPrice != null ? round2(costPrice * (1 + MARKUP_PERCENT / 100)) : 0,
    markup: MARKUP_PERCENT,
    unit: "Each",
    current_qty: 0,
    min_qty: 0,
    target_qty: 0,
    is_active: true,
    supplier: SUPPLIER_NSS_ID,
    category: CATEGORY_FASTENERS_ID,
  };
};

const csv = readFileSync(SOURCE_CSV, "utf8").trim();
const [headerLine, ...dataLines] = csv.split("\n");
const headers = headerLine.split(",") as (keyof CsvRow)[];

const rows: CsvRow[] = dataLines.map((line) => {
  const cols = line.split(",");
  const obj = {} as CsvRow;
  headers.forEach((h, i) => {
    (obj as Record<string, string>)[h] = cols[i] ?? "";
  });
  return obj;
});

const records = rows.map(toPbRecord);

writeFileSync(
  OUTPUT_JSON,
  JSON
    .stringify(
      {
        meta: {
          source_csv: "scripts/nss-split-pins-din94-pilot.csv",
          source_url: SOURCE_URL,
          extracted_at: EXTRACTED_AT,
          row_count: records.length,
          pb_collection: "stock_items",
          notes:
            "selling_price = cost_price * (1 + 80%). name=description both carry the PosCode (e.g., '5x50 SPLIT PIN PLN'). unit=Each (split pins are sold by piece). DIN94 split pins come in Mild Steel Grade 4.8 (Zinc Plated) and Stainless Steel A2/A4 (Plain). Pack rule captures 'Pack of N' from the page (25/50/100/200). Source URL is the unfiltered category landing page; each row carries its own product URL.",
        },
        records,
      },
      null,
      2,
    ),
);

console.log(`Wrote ${records.length} records to ${OUTPUT_JSON}`);