// =============================================================================
//  Payment API adapter
//  -----------------------------------------------------------------------------
//  This is the ONLY file you need to edit when integrating a real payment-link API.
//  Just make sure createPaymentLink(payload) returns:
//      { link: '<payment url>', raw: <the full original response for reference> }
//
//  The payload it receives has the shape:
//  {
//    customerName, email, phone, address, currency,
//    items: [ { sku, name, price, quantity, condition } ],
//    total
//  }
// =============================================================================

const PAYMENT_API_URL = process.env.PAYMENT_API_URL;
const PAYMENT_API_KEY = process.env.PAYMENT_API_KEY;

async function createPaymentLink(payload) {
  // --- Map the form data to the body the API expects ------------------------
  // TODO: adjust the body to match your real API.
  const body = {
    fullname: payload.customerName,
    customer_email: payload.email,
    phone: payload.phone,
    address: payload.address,
    items: payload.items.map((it) => ({
      sku: it.sku,
      name: it.name ?? it.sku,
      price: it.price,
      quantity: it.quantity,
      condition: it.condition,
    })),
    total_price: payload.total,
    currency: payload.currency,
    quote_url: 'https://your-website.com/quote',
    // API expects PHP format Y-m-d\TH:i:s.u\Z (microseconds = 6 digits).
    // toISOString() only gives 3 (ms), so pad the fraction to 6 digits.
    expired_at: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000)
      .toISOString()
      .replace('Z', '000Z'), // 7 days from now, e.g. 2026-07-09T12:34:56.789000Z
    quoted_by: {
      id: "1",
      fullname: "Kay",
      email: "kay@prology.net",
      phone: "AU: +61 2 8061 6886 ext 8007, US: +1 714 689 3332 ext 8007",
    },
    quote_number: payload.quoteNumber,
  };

  const res = await fetch(PAYMENT_API_URL, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Accept': 'application/json',
      'Authorization': `${PAYMENT_API_KEY}`,
    },
    body: JSON.stringify(body),
  });

  const text = await res.text();
  let data;
  try {
    data = JSON.parse(text);
  } catch {
    data = { raw: text };
  }

  if (!res.ok) {
    throw new Error(
      `Payment API returned ${res.status}: ${typeof data === 'string' ? data : JSON.stringify(data)}`
    );
  }

  // --- Extract the link from the response ----------------------------------
  // TODO: adjust the field path to match your real API.
  const link =
    data.url ||
    data.link ||
    data.payment_link ||
    data.paymentUrl ||
    (data.data && (data.data.url || data.data.link));

  if (!link) {
    throw new Error('No payment link found in the response: ' + JSON.stringify(data));
  }

  return { link, raw: data };
}

module.exports = { createPaymentLink };