// NL cities we can place on the homepage map, pre-projected into the 240x300 viewBox
// (bbox lon 3.30-7.25, lat 50.72-53.60). The location stat and the map both resolve
// member locations through matchNlCity, so the count always equals the plotted dots.
// The map is deliberately NL-only: members living abroad are welcome but do not appear here.
export const NL_CITIES: Record<string, [number, number]> = {
  Amsterdam: [97.5, 128.4],
  Rotterdam: [71.6, 174.5],
  'The Hague': [60.8, 159.3],
  Utrecht: [110.7, 157.2],
  Eindhoven: [131.8, 224.8],
  Groningen: [198.5, 39.6],
  Tilburg: [108.8, 212.4],
  Almere: [119.4, 130.1],
  Breda: [89.2, 211.3],
  Nijmegen: [154.2, 186.2],
  Enschede: [218.4, 143.6],
  Haarlem: [81.8, 126.3],
  Arnhem: [157.9, 168.2],
  Amersfoort: [126.9, 150.4],
  "'s-Hertogenbosch": [121.7, 198.1],
  Zwolle: [169.1, 112.8],
  Leiden: [72.7, 150.0],
  Maastricht: [145.3, 286.3],
  Delft: [64.2, 165.5],
  Alkmaar: [88.3, 100.8],
  'Sprang-Capelle': [99.2, 201.4],
  Deventer: [174.0, 140.1],
  Leeuwarden: [151.9, 41.5],
};

// Aliases that should resolve to a canonical key in NL_CITIES.
const ALIASES: Record<string, string> = {
  'den haag': 'The Hague',
  "'s-gravenhage": 'The Hague',
  "den bosch": "'s-Hertogenbosch",
};

/** Resolve a Sifa location string to a canonical NL city key, or null if it is not
 *  an NL city we can place (bare country, non-NL city, or unknown town). */
export function matchNlCity(location: string): string | null {
  const raw = location.split(',')[0].trim();
  if (!raw) return null;
  if (Object.prototype.hasOwnProperty.call(NL_CITIES, raw)) return raw;
  const lc = raw.toLowerCase();
  if (ALIASES[lc]) return ALIASES[lc];
  for (const key of Object.keys(NL_CITIES)) {
    if (key.toLowerCase() === lc) return key;
  }
  return null;
}