export interface MapCoordinates {
  lat: number
  lng: number
}

const isLatitude = (value: number) => Number.isFinite(value) && value >= -90 && value <= 90
const isLongitude = (value: number) => Number.isFinite(value) && value >= -180 && value <= 180

export function hasMapCoordinates(lat: number | null | undefined, lng: number | null | undefined) {
  return typeof lat === 'number' && typeof lng === 'number' && isLatitude(lat) && isLongitude(lng)
}

export function toMapCoordinates(lat: number | null | undefined, lng: number | null | undefined): MapCoordinates | null {
  if (typeof lat !== 'number' || typeof lng !== 'number' || !hasMapCoordinates(lat, lng)) return null

  return { lat, lng }
}

function coordinatePair({ lat, lng }: MapCoordinates) {
  return `${lat},${lng}`
}

/** Opens the event pin in Neshan when the visitor's location is unavailable. */
export function getNeshanPlaceUrl(destination: MapCoordinates) {
  const url = new URL('https://nshn.ir/')

  url.searchParams.set('lat', String(destination.lat))
  url.searchParams.set('lng', String(destination.lng))

  return url.toString()
}

/** Opens driving directions in Neshan from a known origin to an event destination. */
export function getNeshanDirectionsUrl(origin: MapCoordinates, destination: MapCoordinates) {
  const url = new URL('https://nshn.ir/maps')

  url.searchParams.set('origin', coordinatePair(origin))
  url.searchParams.set('destination', coordinatePair(destination))
  url.searchParams.set('type', 'drive')

  return url.toString()
}