import { categoryFamily } from '@rareindex/taxonomy';
import { normalizeForMatch, type AssetAttributes } from '@rareindex/shared';

/**
 * Deterministic canonical key per category family (§112). Two descriptions of the same object
 * from different sources must produce the same key when their structured attributes agree.
 * Unknown parts are encoded as '' so partial records still collide with fuller ones only when
 * the discriminating fields match.
 */
const n = (s: string | null | undefined): string => (s ? normalizeForMatch(s).replace(/\s+/g, ' ') : '');
const num = (s: string | null | undefined): string => (s ? s.toLowerCase().replace(/^#/, '').replace(/\s+/g, '') : '');

/** Identifier keys considered deterministic enough to match on their own. */
export const DETERMINISTIC_IDS = [
  'scryfall_id', 'oracle_id', 'tcgplayer_id', 'cardmarket_id', 'pokemontcg_id', 'ygo_id', 'ygo_set_code', 'psa_spec_id', 'psa_item_id',
  'style_code', 'sku', 'upc', 'ean', 'isbn', 'jan', 'lego_set_number', 'bricklink_id', 'brickset_id', 'pricecharting_id', 'reference', 'goldin_item_id', 'stockx_id', 'chrono24_id', 'comic_id', 'gocollect_id', 'hobbydb_id', 'funko_id',
  'tcgdex_id', 'lorcast_id', 'mtggoldfish_uuid', 'gatcg_edition_id', 'swudb_id', 'digimoncard_id', 'sorcery_printing_id', 'discogs_release_id', 'pcgs_number', 'mfc_id', 'comics_org_id', 'ebay_epid', 'asin', 'vin', 'bgg_id', 'amiami_gcode', 'fossilera_item', 'ppg_id',
  // 2026-09-08 wave — product-level ids only. Item-level ids (lot numbers, listing ids, slab cert numbers) are
  // deliberately NOT here: certs live in `certificates`, listings/sales are keyed by (source, externalId).
  'limitless_card', 'yuyutei_card', 'hareruya_product_id', 'cardrush_product_id', 'cardtrader_blueprint_id',
  'pick_number', 'ngc_coin_id', 'numista_id', 'km_number', 'sg_number', 'whisky_auction_product', 'gcd_issue_id', 'gamevaluenow_id',
] as const;

export function deterministicIdentifiers(ids: Record<string, string> | undefined): Record<string, string> {
  const out: Record<string, string> = {};
  if (!ids) return out;
  for (const k of DETERMINISTIC_IDS) {
    const v = ids[k];
    if (v && String(v).trim()) out[k] = String(v).trim();
  }
  return out;
}

export function buildCanonicalKey(a: AssetAttributes): string {
  const family = categoryFamily(a.categorySlug);
  const cat = a.categorySlug;
  switch (family) {
    case 'trading_cards':
    case 'sports_cards':
    case 'non_sport_cards': {
      const set = n(a.setCode) || n(a.set);
      return [cat, set, num(a.number), n(a.name), n(a.variant), n(a.language) || 'en'].join('|');
    }
    case 'watches':
      return [cat, n(a.brand), n(a.reference) || n(a.model), n(a.variant)].join('|');
    case 'sneakers': {
      const style = a.identifiers?.style_code ?? a.identifiers?.sku;
      return style ? [cat, n(style)].join('|') : [cat, n(a.brand), n(a.model) || n(a.name), n(a.color), a.year ?? ''].join('|');
    }
    case 'lego': {
      const setNo = a.identifiers?.lego_set_number ?? a.number ?? a.model;
      return [cat, setNo ? num(setNo) : n(a.name), n(a.variant)].join('|');
    }
    case 'video_games':
    case 'gaming_hardware':
      return [cat, n(a.identifiers?.platform ?? a.series ?? a.brand), n(a.name), n(a.region) || n(a.language), n(a.variant)].join('|');
    case 'comics':
    case 'manga':
      return [cat, n(a.brand), n(a.series) || n(a.name), num(a.number), n(a.variant), a.year ?? ''].join('|');
    case 'funko':
    case 'designer_toys':
    case 'action_figures':
    case 'vintage_toys':
      return [cat, n(a.brand), n(a.series) || n(a.franchise), num(a.number), n(a.name), n(a.variant)].join('|');
    case 'coins':
    case 'banknotes':
      return [cat, n(a.country), a.year ?? '', n(a.name), n(a.variant) || n(a.identifiers?.mint_mark)].join('|');
    case 'wine':
    case 'whisky':
    case 'rum':
    case 'cognac':
      return [cat, n(a.brand), n(a.name), a.year ?? '', n(a.size)].join('|');
    default:
      return [cat, n(a.brand), n(a.name), a.year ?? '', n(a.variant), n(a.reference) || num(a.number)].join('|');
  }
}

/** Human title used for slugs, search and display. Deterministic from attributes. */
export function composeTitle(a: AssetAttributes): string {
  const family = categoryFamily(a.categorySlug);
  const parts: string[] = [];
  switch (family) {
    case 'trading_cards':
    case 'sports_cards':
    case 'non_sport_cards': {
      let head = a.name;
      if (a.number) head += ` #${a.number.replace(/^#/, '')}`;
      const tail = [a.set, a.edition, a.variant].filter(Boolean).join(' ');
      parts.push(head);
      if (tail) parts.push(tail);
      if (a.year) parts.push(`(${a.year})`);
      break;
    }
    case 'watches':
      parts.push([a.brand, a.model ?? a.name].filter(Boolean).join(' '));
      if (a.reference) parts.push(a.reference);
      if (a.variant) parts.push(a.variant);
      break;
    case 'sneakers':
      parts.push(a.name);
      if (a.color && !a.name.toLowerCase().includes(a.color.toLowerCase())) parts.push(a.color);
      if (a.identifiers?.style_code) parts.push(a.identifiers.style_code);
      break;
    case 'lego': {
      const setNo = a.identifiers?.lego_set_number ?? a.number;
      parts.push([setNo ? `LEGO ${setNo}` : 'LEGO', a.name].filter(Boolean).join(' '));
      if (a.series) parts.push(a.series);
      if (a.year) parts.push(`(${a.year})`);
      break;
    }
    case 'video_games':
    case 'gaming_hardware':
      parts.push(a.name);
      if (a.identifiers?.platform ?? a.series) parts.push(a.identifiers?.platform ?? a.series ?? '');
      if (a.region) parts.push(a.region);
      break;
    case 'comics':
    case 'manga':
      parts.push([a.series ?? a.name, a.number ? `#${a.number}` : null].filter(Boolean).join(' '));
      if (a.variant) parts.push(a.variant);
      if (a.year) parts.push(`(${a.year})`);
      break;
    default:
      parts.push([a.brand, a.name].filter(Boolean).join(' '));
      if (a.variant) parts.push(a.variant);
      if (a.year) parts.push(`(${a.year})`);
  }
  return parts.filter(Boolean).join(' · ').replace(/\s+/g, ' ').trim();
}