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/// Used to specify pass throughs or stopovers at intermediate locations.
#[derive(Clone, Debug)]
pub enum Waypoint {
    /// If you pass an address, the Directions service geocodes the string and
    /// converts it to a latitude/longitude coordinate to calculate directions.
    /// This coordinate may be different from that returned by the Geocoding
    /// API, for example a building entrance rather than its center.
    Address(String),
    /// If you pass coordinates, they are used unchanged to calculate
    /// directions.
    LatLng {
        /// Latitude
        lat: f32,
        /// Longitude
        lng: f32
    },
    /// The place ID may only be specified if the request includes an API key or
    /// a Google Maps Platform Premium Plan client ID. You can retrieve place
    /// IDs from the Geocoding API and the Places API (including Place
    /// Autocomplete). For an example using place IDs from Place Autocomplete,
    /// see [Place Autocomplete and Directions](https://developers.google.com/maps/documentation/javascript/examples/places-autocomplete-directions).
    /// For more about place IDs, see the [Place ID overview](https://developers.google.com/places/place-id).
    PlaceId(String),
    /// Alternatively, you can supply an encoded set of points using the
    /// [Encoded Polyline Algorithm](https://developers.google.com/maps/documentation/utilities/polylinealgorithm).
    /// You will find an encoded set is useful for a large number of waypoints,
    /// because the URL is significantly shorter. All web services have a URL
    /// limit of 8192 characters.
    Polyline(String),
} // enum

impl From<&Waypoint> for String {
    /// Converts a `Waypoint` enum to a `String` that contains a
    /// [waypoint](https://developers.google.com/maps/documentation/directions/intro#Waypoints)
    /// value.
    fn from(waypoint: &Waypoint) -> String {
        match waypoint {
            Waypoint::Address(address) => address.clone(),
            Waypoint::LatLng { lat, lng } => format!("{:.7},{:.7}", lat, lng),
            Waypoint::PlaceId(place_id) => format!("place_id:{}", place_id),
            Waypoint::Polyline(polyline) => format!("enc:{}:", polyline),
        } // match
    } // fn
} // impl