DD.WellWorkover.Cloud/AsbCloudInfrastructure/Services/TimeZoneService.cs

using AsbCloudApp.Data;
using AsbCloudApp.Services;
using System.Net.Http;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Services
{
    public class TimezoneService : ITimezoneService
    {
        private class TimeZoneInfo
        {
            public string? Sunrise { get; set; }
            public double Lng { get; set; }
            public double Lat { get; set; }
            public string? CountryCode { get; set; }
            public double GmtOffset { get; set; }
            public double RawOffset { get; set; }
            public string? Sunset { get; set; }
            public string? TimezoneId { get; set; }
            public double DstOffset { get; set; }
            public string? CountryName { get; set; }
            public string? Time { get; set; }
        }

        private const string timezoneApiUrl = "http://api.geonames.org/timezoneJSON";
        private const string timezoneApiUserName = "asbautodrilling";

        public SimpleTimezoneDto? GetOrDefaultByCoordinates(double latitude, double longitude)
        => GetOrDefaultByCoordinatesAsync(latitude, longitude, default).Result;

        public async Task<SimpleTimezoneDto?> GetOrDefaultByCoordinatesAsync(double latitude, double longitude, CancellationToken token)
        {
            var lat = latitude.ToString(System.Globalization.CultureInfo.InvariantCulture);
            var lng = longitude.ToString(System.Globalization.CultureInfo.InvariantCulture);

            var url =
                $"{timezoneApiUrl}?lat={lat}&lng={lng}&username={timezoneApiUserName}";

            using var client = new HttpClient();

            var response = await client.GetAsync(url, token)
                .ConfigureAwait(false);

            var responseJson = await response.Content.ReadAsStringAsync(token)
                .ConfigureAwait(false);

            if (!(responseJson.Contains("timezoneId") && responseJson.Contains("dstOffset")))
                return null;

            var options = new JsonSerializerOptions
            {
                PropertyNameCaseInsensitive = true
            };
            var timezoneInfo = JsonSerializer.Deserialize<TimeZoneInfo>(responseJson, options);

            if(timezoneInfo is null)
                return null;

            return new SimpleTimezoneDto
            {
                Hours = timezoneInfo.DstOffset,
                IsOverride = false,
                TimezoneId = timezoneInfo.TimezoneId,
            };
        }


    }
}