public async Task<List<ArticleModel>> GetArticlesByGpsCoordinateAsync(GeoLocation geolocation, float radius = 10000)
{
if (geolocation == null)
{
throw new ArgumentNullException(nameof(geolocation), @"Can not find coordinate");
}
var articlesUrl = GetSearchArticlesUrl(geolocation, radius);
var response = await _client.GetAsync(articlesUrl);
// Will throw exception on unsuccessfull response.
response.EnsureSuccessStatusCode();
var results = await response.Content.ReadAsAsync<WikiArticleResult>();
return results?.Query?.GeoSearchResults?.Select(article => new ArticleModel
{
Title = article.Title,
PageId = article.PageId,
Latitude = article.Latitude,
Longitude = article.Longitude,
Distance = article.Distance
}).ToList() ?? new List<ArticleModel>();
}
/// <summary>
/// Returns Url for given GeoLocation to get Json data
/// </summary>
/// <param name="geoLocation"></param>
/// <param name="radius"></param>
/// <param name="resultLimit"></param>
/// <returns></returns>
private static string GetSearchArticlesUrl(GeoLocation geoLocation, float radius = 10000, int resultLimit = 50)
{
if (radius < 10)
radius = 10;
if (radius > 100000)
radius = 100000;
if (resultLimit < 1)
resultLimit = 1;
if (resultLimit > 500)
resultLimit = 500;
return $"https://en.wikipedia.org/w/api.php?action=query&list=geosearch&gsradius={radius}&gscoord={geoLocation.Latitude}|{geoLocation.Longitude}&gslimit={resultLimit}&format=json";
}