/*!
 * PHASE 6D — Nuva Consultations -> IS60 product bridge (read-only resolver)
 *
 * WHAT THIS FILE DOES, AND ONLY THIS:
 *   NuvaProductCatalogAdmin already exposes getProductUrl(product) and
 *   isProductPurchasable(productId), and NuvaProductRecommendationUI's
 *   buildProductCardData() already calls exactly those two functions (fresh
 *   off window.NuvaProductCatalogAdmin on every call) to decide a
 *   recommended product's "View Product" link and availability. This file
 *   wraps those two functions so that, when a Nuva catalog product carries a
 *   sku, its link/availability reflect the REAL, live IS60 WooCommerce
 *   record instead of only the Nuva-side catalog's own bookkeeping.
 *
 * WHAT THIS FILE DELIBERATELY DOES NOT DO:
 *   - It does not touch the assessment/matching/recommendation engines, the
 *     safety gate, NuvaCart, or NuvaCheckout.
 *   - It does not decide whether a product is a good match for the
 *     customer's skin -- that stays the matching engine's job.
 *   - It never fabricates a product, price, or URL. A SKU that IS60 can't
 *     resolve is simply left unresolved, and the existing catalog-side
 *     status is used unchanged (fail-open for the rest of the consultation).
 *   - It never sends assessment answers, concerns, or any personal data
 *     anywhere -- the only thing sent to IS60 is a product SKU that this
 *     page's own catalog already stored.
 *
 * Runs on the Quick Skin Match (free) and Advanced Skin Scan (advanced)
 * pages, which both load the same shared NuvaProductCatalogAdmin /
 * NuvaProductRecommendationUI modules -- one bridge, both paths (Phase 6D
 * Step 7).
 */
(function () {
  'use strict';

  var IS60_RESOLVE_ENDPOINT = 'https://is60.store/wp-json/is60/v1/resolve-products';
  var BATCH_SIZE = 20; // matches the endpoint's own cap
  var REF_BY_SLUG = {
    'quick-skin-match': 'nuva-quick-skin-match',
    'ai-skin-scan': 'nuva-advanced-skin-scan'
  };

  function currentRefTag() {
    var slug = (window.location.pathname || '').replace(/\/+$/, '').split('/').pop();
    return REF_BY_SLUG[slug] || 'nuva-consultation';
  }

  // sku -> resolved product object from IS60, or `false` once confirmed
  // unresolvable. Absence of a key means "not looked up (yet)".
  var resolved = Object.create(null);
  var pending = Object.create(null);

  function chunk(arr, size) {
    var out = [];
    for (var i = 0; i < arr.length; i += size) out.push(arr.slice(i, i + size));
    return out;
  }

  // Looks up a batch of SKUs against IS60's public, read-only resolver.
  // Fails open: a network error or bad response just leaves those SKUs
  // unresolved, so callers fall back to the Nuva catalog's own status.
  function resolveSkus(skus) {
    var need = [];
    for (var i = 0; i < skus.length; i++) {
      var s = skus[i];
      if (s && !(s in resolved) && !pending[s]) need.push(s);
    }
    if (!need.length) return Promise.resolve();
    need.forEach(function (s) { pending[s] = true; });

    var batches = chunk(need, BATCH_SIZE);
    return Promise.all(
      batches.map(function (batch) {
        var url = IS60_RESOLVE_ENDPOINT + '?skus=' + encodeURIComponent(batch.join(','));
        return fetch(url)
          .then(function (r) { return r.ok ? r.json() : []; })
          .then(function (list) {
            var foundInBatch = Object.create(null);
            (list || []).forEach(function (item) {
              if (item && item.sku) {
                resolved[item.sku] = item;
                foundInBatch[item.sku] = true;
              }
            });
            batch.forEach(function (s) {
              if (!foundInBatch[s]) resolved[s] = false; // confirmed: IS60 has no such published, purchasable SKU
            });
          })
          .catch(function () {
            // Network/CORS failure: leave these SKUs unresolved rather than
            // guessing. isProductPurchasable()/getProductUrl() fall back to
            // the existing Nuva catalog behavior below.
          });
      })
    ).then(function () {
      need.forEach(function (s) { delete pending[s]; });
    });
  }

  function withRefTag(url) {
    if (!url) return url;
    var sep = url.indexOf('?') === -1 ? '?' : '&';
    // Opaque, non-sensitive context only -- never assessment content.
    return url + sep + 'utm_source=nuva-consultation&utm_medium=recommendation&nuva_ref=' + encodeURIComponent(currentRefTag());
  }

  function patchCatalogAdmin(admin) {
    if (!admin || admin.__is60BridgeApplied) return;
    admin.__is60BridgeApplied = true;

    var originalGetProductUrl = admin.getProductUrl.bind(admin);
    var originalIsPurchasable = admin.isProductPurchasable.bind(admin);
    var originalGetProduct = typeof admin.getProduct === 'function' ? admin.getProduct.bind(admin) : null;

    admin.getProductUrl = function (product) {
      var sku = product && product.sku;
      var live = sku ? resolved[sku] : null;
      if (live && live.url && live.purchasable) {
        return withRefTag(live.url);
      }
      return originalGetProductUrl(product);
    };

    admin.isProductPurchasable = function (productId) {
      var product = originalGetProduct ? originalGetProduct(productId) : null;
      var sku = product && product.sku;
      var live = sku ? resolved[sku] : null;
      if (live === false) return false; // IS60 confirmed: no such published/purchasable product
      if (live && typeof live.purchasable === 'boolean') return live.purchasable;
      return originalIsPurchasable(productId); // not yet resolved (or no sku) -- unchanged behavior
    };
  }

  function prefetchFromCatalog(admin) {
    if (!admin || typeof admin.listProducts !== 'function') return;
    var products = admin.listProducts() || [];
    var skus = products
      .map(function (p) { return p && p.sku; })
      .filter(Boolean);
    if (skus.length) resolveSkus(skus);
  }

  function init() {
    var admin = window.NuvaProductCatalogAdmin;
    if (!admin) return; // this page doesn't load the shared catalog module
    patchCatalogAdmin(admin);
    prefetchFromCatalog(admin);
  }

  init();
  if (document.readyState !== 'complete') {
    window.addEventListener('load', init); // retry once in case the engine attaches after this script runs
  }

  // Event-ready for a future phase (Step 16) -- nothing is sent anywhere yet.
  window.NuvaIS60Bridge = {
    version: '1.0',
    resolveSkus: resolveSkus,
    getResolved: function (sku) { return Object.prototype.hasOwnProperty.call(resolved, sku) ? resolved[sku] : undefined; }
  };
})();