const finiteCount = (value, fallback) => {
  const count = Number(value)
  return Number.isFinite(count) && count >= 0 ? count : fallback
}

export const clusterSizeClass = count => {
  if (count >= 100_000) return "is-xxl"
  if (count >= 10_000) return "is-xl"
  if (count >= 1_000) return "is-lg"
  return "is-md"
}

export const clusterCountLabel = (count, locale = "en") => {
  const value = finiteCount(count, 0)

  if (value < 1_000) return new Intl.NumberFormat(locale).format(value)

  return new Intl.NumberFormat(locale, {
    notation: "compact",
    maximumFractionDigits: value < 10_000 ? 1 : 0
  }).format(value)
}

export const clusterExpansionTarget = (currentZoom, requestedZoom, maximumZoom = 22) => {
  const current = finiteCount(currentZoom, 0)
  const requested = finiteCount(requestedZoom, current + 1)
  const nearestIntegerZoom = Math.round(current)
  const normalizedCurrent =
    Math.abs(current - nearestIntegerZoom) < 0.001 ? nearestIntegerZoom : current
  const nextIntegerZoom = Math.floor(normalizedCurrent) + 1

  return Math.min(maximumZoom, Math.max(nextIntegerZoom, requested))
}

export const pointFeatureCollection = points => ({
  type: "FeatureCollection",
  features: points.map(point => ({
    type: "Feature",
    id: point.id,
    properties: {
      id: point.id,
      item_type: point.type || "request",
      title: point.title || "",
      location: point.location || "",
      exact: point.exact === true,
      radius_meters: Number.isFinite(point.radius_meters) ? point.radius_meters : 0,
      weight: finiteCount(point.count, 1),
      urgent_weight: finiteCount(point.urgent_count, 0),
      server_cluster_id: point.cluster_id || "",
      parent_cluster_id: point.parent_cluster_id || "",
      hierarchy_level: finiteCount(point.hierarchy_level, 0),
      expansion_zoom: finiteCount(point.expansion_zoom, 22)
    },
    geometry: {
      type: "Point",
      coordinates: [Number(point.longitude), Number(point.latitude)]
    }
  }))
})