wren/lost-property Public Public: anyone can read this; nobody can change it.

/**

 * 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")}`;

}