// ============================================================================
// W5 runtime body — footer purchase/expiry check (public, read-only).
// Query: GET /dk-purchase-check?u=<username>&k=<shared-key>
// Returns: [{ product, expires_at, status }] for the customer's products,
//          or { error } when username unknown / key wrong.
// ============================================================================

// n8n Code node context: ctx = { $env, helpers }
const ctx = { $env, helpers: this.helpers };

// --- input from the "Extract Query" node (already validated the shared key) ---
const username = String($json.username || '').trim();

// --- helpers (self-contained; no shared lib needed for pure reads) ---
function linkId(v) {
  if (v == null) return null;
  if (typeof v === 'object' && !Array.isArray(v)) return v.Id ?? v.id ?? null;
  if (Array.isArray(v)) return v[0]?.Id ?? v[0]?.id ?? null;
  return v;
}

async function ncGet(path) {
  return await ctx.helpers.httpRequest({
    method: 'GET',
    url: ctx.$env.NOCODB_URL + path,
    headers: { 'xc-token': ctx.$env.NOCODB_TOKEN },
    json: true,
  });
}

const T_CUST = ctx.$env.NOCODB_TABLE_CUSTOMERS;
const T_CP = ctx.$env.NOCODB_TABLE_CUSTOMERPRODUCTS;

// 1. resolve username -> customer id (username is unique in Customers)
const custRows = (await ncGet(
  `/api/v2/tables/${T_CUST}/records?where=(username,eq,${encodeURIComponent(username)})&limit=1`
)).list || [];
const customer = custRows[0];

if (!customer) {
  return { json: { username, purchases: [], known: false } };
}

// 2. fetch this customer's products (active + not-yet-expired) OR all for display
const cps = (await ncGet(
  `/api/v2/tables/${T_CP}/records?where=(customer.Id,eq,${customer.Id})&limit=1000`
)).list || [];

const today = new Date().toISOString().slice(0, 10);
const purchases = cps
  .map(c => {
    const productObj = (typeof c.product === 'object' && c.product) ? c.product : null;
    const name = productObj?.name ?? 'Product';
    const expires = c.expires_at ? String(c.expires_at).slice(0, 10) : null;
    let state = 'active';
    if (c.status === 'active' && expires && expires <= today) state = 'expired';
    else if (c.status && c.status !== 'active') state = c.status;

    return {
      product: name,
      product_id: linkId(c.product),
      expires_at: expires,
      status: c.status || null,
      display_state: state,      // active / expired / revoked / suspended
    };
  })
  // sort: active (expiring soonest first), then expired (most recent expiry first)
  .sort((a, b) => {
    const rank = { active: 0, suspended: 1, revoked: 2, expired: 3 };
    if (rank[a.display_state] !== rank[b.display_state]) return rank[a.display_state] - rank[b.display_state];
    return String(a.expires_at || '').localeCompare(String(b.expires_at || ''));
  });

return {
  json: {
    username,
    known: true,
    purchases,
  },
};