/**
 * Maps scripts/nss-fasteners-pilot.csv into PocketBase
 * `stock_items` records for review.
 *
 * Output: scripts/nss-fasteners-pb-import.json
 *
 * No data is written to PocketBase yet — this is for the user to
 * inspect the field mapping before any ingest.
 *
 * Run:  bun scripts/nss-fasteners-pb-transform.ts
 *  or:  npx tsx scripts/nss-fasteners-pb-transform.ts
 */
import { readFileSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';

// === Configurable per source run ===
// Override at the command line with NSS_PRODUCT=washers NSS_GRADE=...
// to point this transform at a different CSV / category without
// editing the file. Defaults below are for the hex nut DIN934 run.
const PRODUCT = process.env.NSS_PRODUCT ?? 'hex-nut-din934';
const SOURCE_CSV = join(
  import.meta.dirname,
  process.env.NSS_CSV ?? 'nss-fasteners-single-pieces.csv',
);
const OUTPUT_JSON = join(
  import.meta.dirname,
  process.env.NSS_OUTPUT ?? 'nss-fasteners-pb-import.json',
);
const SOURCE_URL =
  process.env.NSS_URL ??
  'https://nssfasteners.co.za/nuts/hex-nuts/hex-nut-din934.html?gradematerial=771,773';
const SOURCE_LABEL =
  process.env.NSS_LABEL ?? 'NSS Fasteners price list - hex nut DIN934 (Grade 8 + A2)';
const EXTRACTED_AT = process.env.NSS_EXTRACTED_AT ?? '2026-09-16';

// === supplied by operator on 2026-09-16 ===
const SUPPLIER_NSS_ID = '6xuu7a0pmmubtqd';
const CATEGORY_FASTENERS_ID = '4emvaanzogj0586';
const MARKUP_PERCENT = 80; // selling_price = cost_price * (1 + MARKUP_PERCENT / 100)

const SOURCE_URL =
  'https://nssfasteners.co.za/nuts/hex-nuts/hex-nut-din934.html?gradematerial=771,773';
const SOURCE_LABEL = 'NSS Fasteners price list - hex nut DIN934 (Grade 8 + A2)';
const EXTRACTED_AT = '2026-09-16'; // YYYY-MM-DD

type CsvRow = {
  SKU: string;
  PosDescription: string;
  Description: string;
  Material: string;
  Grade: string;
  Diameter: string;
  Thread: string;
  Finish: string;
  Pack: string;
  UnitPrice: string;
};

const parsePrice = (s: string): number | null => {
  // "R 59.66" -> 59.66
  const m = s.match(/([\d.]+)/);
  if (!m) return null;
  const n = parseFloat(m[1]);
  return Number.isFinite(n) ? n : null;
};

const toPbRecord = (r: CsvRow) => {
  const costPrice = parsePrice(r.UnitPrice);
  const notes = [
    `Material: ${r.Material}`,
    `Grade: ${r.Grade}`,
    `Diameter: ${r.Diameter}`,
    `Thread: ${r.Thread}`,
    `Finish: ${r.Finish}`,
    `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',
    },
  ];

  return {
    // === required (SKU-style code — what the POS shows) ===
    // Both `name` and `description` carry the SKU-style code so the
    // POS sees the same string regardless of which field it pulls.
    // The friendly product type ("Black Cut Washer DIN126", "Hex
    // Nut DIN934", etc.) lives in `notes` for human-readable audit.
    name: r.PosDescription,
    description: r.PosDescription,

    // === identifying ===
    sku: r.SKU,

    // === sourcing / tracking (user's suggestion) ===
    location: SOURCE_LABEL,
    notes,
    cost_history: costHistory,

    // === pricing ===
    cost_price: costPrice,
    selling_price: costPrice != null ? round2(costPrice * (1 + MARKUP_PERCENT / 100)) : 0,
    markup: MARKUP_PERCENT,

    // === inventory defaults (no source data) ===
    unit: r.Pack || 'Each',
    current_qty: 0,
    min_qty: 0,
    target_qty: 0,
    is_active: true,

    // === relations (looked up by the operator) ===
    supplier: SUPPLIER_NSS_ID,
    category: CATEGORY_FASTENERS_ID,
  };
};

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

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 => {
  // naive CSV split - no embedded commas in current dataset, so safe.
  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);

const SOURCE_URL_LINE = SOURCE_URL;

writeFileSync(
  OUTPUT_JSON,
  JSON.stringify(
    {
      meta: {
        product: PRODUCT,
        source_csv: SOURCE_CSV.replace(import.meta.dirname + '/', ''),
        source_url: SOURCE_URL_LINE,
        extracted_at: EXTRACTED_AT,
        row_count: records.length,
        pb_collection: 'stock_items',
        notes:
          'selling_price computed as cost_price * (1 + ' + MARKUP_PERCENT + '%). Re-run with updated cost_price to refresh prices. name=description both carry the SKU-style PosCode (POS-friendly).',
      },
      records,
    },
    null,
    2,
  ),
);

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