/**
 * How much an OpenStreetMap place says about itself (scripts/build-backpacker-places.mjs).
 *
 * The map is for places worth going to. OpenStreetMap holds every bench with
 * a tap, so a place earns its pin by being described: a name, a web page, a
 * phone number, opening hours, an entry in Wikipedia or Wikidata, an operator.
 * Kept free of app imports so the build script and the node test runner load it.
 */

type Tags = Readonly<Record<string, string | undefined>>;

export function osmScore(tags: Tags): number {
  let score = 0;
  if (tags.wikidata || tags.wikipedia) score += 3;
  if (tags.website || tags['contact:website']) score += 2;
  if (tags.phone || tags['contact:phone']) score += 1;
  if (tags.opening_hours) score += 1;
  if (tags.operator || tags.brand || tags.network) score += 1;
  if (tags.stars || tags.bottle === 'yes' || tags['internet_access:fee'] === 'no') score += 1;
  if (tags['name:en'] || tags.name) score += 1;
  return score;
}

/** Whether another place of the same kind is already kept within about 350 m. */
export function nearKept(kept: ReadonlySet<string>, latitude: number, longitude: number): boolean {
  const cell = (value: number) => Math.round(value / 0.0035);
  const y = cell(latitude);
  const x = cell(longitude);
  for (let dy = -1; dy <= 1; dy += 1) {
    for (let dx = -1; dx <= 1; dx += 1) {
      if (kept.has(`${y + dy}:${x + dx}`)) return true;
    }
  }
  return false;
}

export function keepCell(kept: Set<string>, latitude: number, longitude: number): void {
  const cell = (value: number) => Math.round(value / 0.0035);
  kept.add(`${cell(latitude)}:${cell(longitude)}`);
}