use geo::{algorithm::haversine_destination::HaversineDestination, Point};
pub fn calculate_coverage(lat_deg: f64, lon_deg: f64, radius_km: f64) -> (f64, f64, f64, f64) {
    let center = Point::new(lon_deg, lat_deg);

    // 计算四个方向（北、南、东、西）的点
    let north = center.haversine_destination(0.0, radius_km);
    let south = center.haversine_destination(180.0, radius_km);
    let east = center.haversine_destination(90.0, radius_km);
    let west = center.haversine_destination(270.0, radius_km);

    let min_lat = south.y();
    let max_lat = north.y();
    let min_lon = west.x();
    let max_lon = east.x();

    (min_lat, max_lat, min_lon, max_lon)
}