/**
 * The curatorial rules: pure functions, no I/O, no randomness. Everything a
 * plaque says about an object — its catalogue number, its vitrine, its
 * condition — is derived only from the object's id and the description its
 * loser gave, so the same item always reads the same way.
 */

export const VITRINES: readonly string[] = [
  "Outerwear and Umbrellas",
  "Keys and Fastenings",
  "Spectacles and Lenses",
  "Small Electronics",
  "Jewellery and Adornment",
  "Papers and Correspondence",
  "Children's Effects",
  "Miscellanea",
];

// Checked in order; the first match wins. Anything that matches nothing
// goes to Miscellanea, the last vitrine.
const KEYWORDS: readonly [RegExp, number][] = [
  [/\b(umbrellas?|coats?|jackets?|gloves?|scarves?|scarfs?|hats?|mittens?)\b/i, 0],
  [/\b(keys?|padlocks?|keyrings?|locks?)\b/i, 1],
  [/\b(glasses|spectacles|sunglasses|lenses?)\b/i, 2],
  [/\b(phones?|chargers?|laptops?|tablets?|earbuds?|headphones?|cameras?|cables?|airpods?)\b/i, 3],
  [/\b(rings?|necklaces?|bracelets?|earrings?|watches?|brooches?)\b/i, 4],
  [/\b(books?|letters?|notebooks?|diaries|diary|papers?|envelopes?|postcards?)\b/i, 5],
  [/\b(toys?|teddy|teddies|dolls?|dummies|dummy|pacifiers?)\b/i, 6],
];

export function vitrineOf(description: string): number {
  for (const [pattern, index] of KEYWORDS) if (pattern.test(description)) return index;
  return VITRINES.length - 1;
}

const CONDITIONS: readonly string[] = [
  "Wear consistent with ordinary use.",
  "Good condition; minor surface wear.",
  "Handled; edges softened with use.",
  "Condition at time of loss not recorded.",
  "As described by the finder; not further examined.",
  "Stable condition; no active deterioration noted.",
];

export function conditionOf(id: number): string {
  return CONDITIONS[id % CONDITIONS.length]!;
}

// A museum accession number: LP, the year it entered the collection, and
// its sequence within the collection — not within that year, since this
// museum is smaller than that distinction is worth.
export function catalogueNumber(id: number, createdAt: string): string {
  const year = createdAt.slice(0, 4);
  return `LP ${year}.${String(id).padStart(4, "0")}`;
}