/**
 * One-time loader — Husqvarna "AUGUST STOCK" cart (2 screenshots) →
 * stock_purchase draft.
 *
 * Source images:
 *   /Volumes/KIOXIA/Downloads/WhatsApp Image 2026-08-03 at 15.14.37.jpeg
 *   /Volumes/KIOXIA/Downloads/WhatsApp Image 2026-08-03 at 15.14.38.jpeg
 *
 * Supplier: HUSQVARNA,.. (id `x7n42attp5qkvhx`)
 * Cart:     "AUGUST STOCK" (Husqvarna South Africa web shop cart)
 * Screenshot date: 2026-08-03 15:14
 * Items:    14 rows across the two images
 *
 * ## Columns on the cart screens
 *
 *   Article    | Net price | RRP    | Discount | Quantity | Total net price | Availability
 *   ---------- | --------- | ------ | -------- | -------- | --------------- | -----------
 *   575 84 22-58 | R 237.39 | R 339.13 | 30% | 2 | R 474.78 | In stock
 *
 * `Net price` is the per-unit price AFTER the supplier's discount has
 * been applied (RRP × (1 − discount)). `Total net price` = qty × net price.
 * e.g.  339.13 × (1 − 0.30) = 237.391 ≈ 237.39 ✓
 *       2 × 237.39 = 474.78 ✓
 *
 * ## ⚠ Cart total discrepancy
 *
 * The cart footer shows **Total R 25,369.86** but the sum of the 14
 * visible line totals is **R 19,115.94** (a R 6,253.92 gap). Possible
 * causes:
 *   1. The two screenshots don't capture the whole cart — the page
 *      header says "Multiple carts" and the footer total may be
 *      aggregating across carts.
 *   2. The supplier's site has a display bug.
 *   3. There's a fee (delivery, handling) added to the footer that's
 *      not in the per-line totals.
 *
 * The script records the supplier's reported total in the headers
 * `notes` field so the discrepancy is visible to the operator. The
 * 14 per-line totals are loaded exactly as shown.
 *
 * ## What this does
 *
 *   1. Validates each line's math: qty × net_price = total.
 *   2. Creates 14 new stock_items (none of these Husqvarna SKUs exist
 *      yet — verified against the running PB before the script started).
 *   3. Creates one stock_purchase with status="draft",
 *      purchase_number = `PO{yy}{mm}{dd}{seq}STK` (today's first in the day).
 *   4. Creates 14 stock_purchase_items with cost_price = net price
 *      (already post-discount).
 *
 * Re-run safety: idempotent on stock_items (re-checks SKU before
 * creating). Does NOT dedupe against an existing draft — don't re-run
 * after success.
 *
 * Run: `npx tsx scripts/2026-08-03-load-husqvarna-cart.ts`
 */
import PocketBase from "pocketbase";

const PB_URL = "https://pocketbase-gnqc88suy8fqk6wyryjjdpvl.169.239.180.130.sslip.io";
const ADMIN_EMAIL = "david.els1@outlook.com";
const ADMIN_PASSWORD = "1234567890";

const HUSQVARNA_SUPPLIER_ID = "x7n42attp5qkvhx";

/* ============================================================================
 * Parsed line items (from eyeballing the two screenshots)
 * ========================================================================== */

interface ParsedLine {
  article: string;          // e.g. "575 84 22-58"
  sku: string;              // e.g. "575269102"
  description: string;      // full product description
  net_price: number;        // per-unit price AFTER supplier's discount
  rrp: number;              // pre-discount RRP
  disc_pct: number;         // supplier discount shown on the row
  quantity: number;
  pdf_total: number;        // "Total net price" column
}

// Image 1 — 6 rows
const LINES: ParsedLine[] = [
  { article: "575 84 22-58", sku: "575269102", description: "Bars 1/4\" 1.3 A318 Pole saw 10\" / 58DL / 1/4\" A318 1.3mm for 327PT5S", net_price:  237.39, rrp:  339.13, disc_pct: 30, quantity: 2, pdf_total:  474.78 },
  { article: "575 84 22-64", sku: "575842264", description: "Bars 1/4\" 1.3 A318 Pole saw 12\" / 64DL / 1/4\" A318 1.3mm for 327PT5S", net_price:  286.09, rrp:  408.70, disc_pct: 30, quantity: 2, pdf_total:  572.18 },
  { article: "501 84 40-64", sku: "501844064", description: "Saw chain H00 1/4\" 1.3 mm 64DL / 12\"",                                    net_price:  213.04, rrp:  304.35, disc_pct: 30, quantity: 3, pdf_total:  639.13 },
  { article: "581 62 66-58", sku: "581626668", description: "Saw Chain X-CUT C85 Chisel 3/8\" 1.5mm 58DL / 18\"",                       net_price:  213.75, rrp:  305.36, disc_pct: 30, quantity: 6, pdf_total: 1282.51 },
  { article: "581 62 66-60", sku: "581626660", description: "Saw Chain X-CUT C85 Chisel 3/8\" 1.5mm 60DL / 16\"",                       net_price:  188.60, rrp:  269.43, disc_pct: 30, quantity: 2, pdf_total:  377.20 },
  { article: "967 63 90-02", sku: "967639002", description: "HUSQVARNA W50P INLET/OUTLET SIZE 50MM, ENGINE 196CC, DISCHARGE CAPACITY 28m³/h", net_price: 3213.91, rrp: 4017.39, disc_pct: 20, quantity: 2, pdf_total: 6427.82 },
  // Image 2 — 8 rows
  { article: "970 48 83-01", sku: "970488301", description: "Husqvarna LC 151 LAWN MOWER",                                              net_price: 5551.30, rrp: 6939.13, disc_pct: 20, quantity: 1, pdf_total: 5551.30 },
  { article: "587 80 85-30", sku: "587808530", description: "Two stroke oil, HP 20 litre",                                              net_price: 1940.32, rrp: 2771.89, disc_pct: 30, quantity: 1, pdf_total: 1940.32 },
  { article: "531 14 78-13", sku: "531147813", description: "LANCE LANCE",                                                              net_price:   50.87, rrp:   78.26, disc_pct: 35, quantity: 1, pdf_total:   50.87 },
  { article: "599 34 85-70", sku: "599348570", description: "BLADE BLADE",                                                              net_price:  197.83, rrp:  304.35, disc_pct: 35, quantity: 4, pdf_total:  791.31 },
  { article: "525 26 91-02", sku: "00057-52.691.02", description: "AIR FILTER ASSY — Air filter mesh 44μm, yellow",                       net_price:  175.22, rrp:  269.57, disc_pct: 35, quantity: 1, pdf_total:  175.22 },
  { article: "503 23 51-08", sku: "62550-32.351.08", description: "SPARK PLUG — Spark Plug RCJ7Y",                                         net_price:   33.91, rrp:   52.17, disc_pct: 35, quantity: 6, pdf_total:  203.46 },
  { article: "503 44 32-01", sku: "62550-34.432.01", description: "FUEL FILTER — Fuel filter Koaxial 35-50μm",                            net_price:   16.96, rrp:   26.09, disc_pct: 35, quantity: 6, pdf_total:  101.75 },
  { article: "581 62 66-84", sku: "581626684", description: "Saw Chain X-CUT C85 Chisel 3/8\" 1.5mm 84DL / 24\"",                       net_price:  264.05, rrp:  377.21, disc_pct: 30, quantity: 2, pdf_total:  528.09 },
];

const CART_DISPLAYED_TOTAL = 25369.86;

/* ============================================================================
 * Math validation
 * ========================================================================== */

function validateLines(lines: ParsedLine[]): { sum: number } {
  let sum = 0;
  for (const l of lines) {
    // Verify the published net price = RRP × (1 − disc).
    const expectedNet = Math.round(l.rrp * (1 - l.disc_pct / 100) * 100) / 100;
    if (Math.abs(expectedNet - l.net_price) > 0.05) {
      throw new Error(
        `Line ${l.sku} net price mismatch: RRP ${l.rrp} × (1 − ${l.disc_pct}%) = ${expectedNet.toFixed(2)}, screenshot says ${l.net_price.toFixed(2)}`,
      );
    }
    // Verify line total = qty × net price.
    const expectedTotal = Math.round(l.quantity * l.net_price * 100) / 100;
    if (Math.abs(expectedTotal - l.pdf_total) > 0.05) {
      throw new Error(
        `Line ${l.sku} total mismatch: ${l.quantity} × ${l.net_price} = ${expectedTotal.toFixed(2)}, screenshot says ${l.pdf_total.toFixed(2)}`,
      );
    }
    sum += l.pdf_total;
  }
  sum = Math.round(sum * 100) / 100;
  console.log(`  Sum of 14 line totals:     R ${sum.toFixed(2)}`);
  console.log(`  Supplier displays:         R ${CART_DISPLAYED_TOTAL.toFixed(2)}`);
  console.log(`  Discrepancy:               R ${(CART_DISPLAYED_TOTAL - sum).toFixed(2)}`);
  return { sum };
}

/* ============================================================================
 * PB utilities
 * ========================================================================== */

async function ensureStockItem(
  pb: PocketBase,
  sku: string,
  description: string,
  supplierId: string,
): Promise<{ id: string; created: boolean }> {
  const existing = await pb.collection("stock_items").getList(1, 1, {
    filter: `sku = "${sku}"`,
    fields: "id",
  });
  if (existing.items.length > 0) {
    return { id: String(existing.items[0].id), created: false };
  }
  const created = await pb.collection("stock_items").create({
    sku,
    name: description,
    description,
    unit: "EA",
    current_qty: 0,
    min_qty: 0,
    target_qty: 0,
    is_active: true,
    supplier: supplierId,
    location: "",
    notes: "",
  });
  return { id: String(created.id), created: true };
}

async function generateDraftNumber(pb: PocketBase): Promise<string> {
  const now = new Date();
  const yy = String(now.getFullYear()).slice(-2);
  const mm = String(now.getMonth() + 1).padStart(2, "0");
  const dd = String(now.getDate()).padStart(2, "0");
  const prefix = `PO${yy}${mm}${dd}`;
  const rows = await pb.collection("stock_purchases").getFullList({
    filter: `purchase_number ~ "${prefix}"`,
    fields: "purchase_number",
  });
  let max = 0;
  for (const r of rows) {
    const m = String(r.purchase_number ?? "").match(/^PO\d{6}(\d{2})STK$/);
    if (m) {
      const n = parseInt(m[1], 10);
      if (Number.isFinite(n) && n > max) max = n;
    }
  }
  const seq = String(max + 1).padStart(2, "0");
  return `${prefix}${seq}STK`;
}

/* ============================================================================
 * Main
 * ========================================================================== */

async function main() {
  console.log("=== 1. Validating math against cart screenshots ===");
  const { sum } = validateLines(LINES);

  console.log(`\n=== 2. Connecting to PocketBase (${PB_URL}) ===`);
  const pb = new PocketBase(PB_URL);
  await pb.collection("_superusers").authWithPassword(ADMIN_EMAIL, ADMIN_PASSWORD);
  console.log("  Authenticated as admin");

  console.log("\n=== 3. Creating stock_items ===");
  const itemIds: string[] = [];
  for (const l of LINES) {
    const { id, created } = await ensureStockItem(pb, l.sku, l.description, HUSQVARNA_SUPPLIER_ID);
    console.log(`  ${created ? "+" : "="} ${l.sku.padEnd(18)} → ${id} ${created ? "" : "(already existed)"}`);
    itemIds.push(id);
  }

  console.log("\n=== 4. Creating stock_purchase draft ===");
  const purchaseNumber = await generateDraftNumber(pb);
  console.log(`  purchase_number: ${purchaseNumber}`);
  const notes =
    `Loaded from Husqvarna SA "AUGUST STOCK" cart screenshots (2026-08-03 15:14). ` +
    `14 line items. ` +
    `Sum of per-line totals: R ${sum.toFixed(2)}; supplier cart footer shows R ${CART_DISPLAYED_TOTAL.toFixed(2)} ` +
    `(discrepancy R ${(CART_DISPLAYED_TOTAL - sum).toFixed(2)} — likely other carts/items not shown in the two screenshots; needs operator reconciliation).`;
  const header = await pb.collection("stock_purchases").create({
    purchase_number: purchaseNumber,
    supplier: HUSQVARNA_SUPPLIER_ID,
    status: "draft",
    notes,
    email_error: "",
    email_message_id: "",
    email_payload: null,
  });
  const purchaseId = String(header.id);
  console.log(`  draft id: ${purchaseId}`);

  console.log("\n=== 5. Creating stock_purchase_items ===");
  for (let i = 0; i < LINES.length; i++) {
    const l = LINES[i];
    const line = await pb.collection("stock_purchase_items").create({
      purchase: purchaseId,
      stock_item: itemIds[i],
      description: l.description,
      quantity: l.quantity,
      quantity_received: 0,
      cost_price: l.net_price,
      notes: `Husqvarna article ${l.article}, RRP ${l.rrp}, disc ${l.disc_pct}%`,
    });
    console.log(`  + ${l.sku.padEnd(18)}  qty=${String(l.quantity).padStart(2)}  cost=R ${l.net_price.toFixed(2).padStart(8)}  line=${line.id}`);
  }

  console.log("\n=== Done ===");
  console.log(`  Draft stock purchase: ${purchaseNumber}  (id ${purchaseId})`);
  console.log(`  Lines: ${LINES.length}`);
  console.log(`  Total cost (post-discount, excl VAT): R ${sum.toFixed(2)}`);
  console.log(`  Supplier cart total (per screenshot): R ${CART_DISPLAYED_TOTAL.toFixed(2)} (diff R ${(CART_DISPLAYED_TOTAL - sum).toFixed(2)})`);
  console.log(`  Supplier: HUSQVARNA,.. (${HUSQVARNA_SUPPLIER_ID})`);
}

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