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,
        };
    }


}