using System;
using System.Linq;
using System.Threading.Tasks;
using InfluxDB.Client;

public class InfluxDataService
{
    private readonly string _url;
    private readonly string _token;
    private readonly string _org;
    private readonly string _bucket;

    public InfluxDataService(string url, string token, string org, string bucket)
    {
        _url = url;
        _token = token;
        _org = org;
        _bucket = bucket;
    }

    public async Task<float> GetLatestTemperatureAsync()
    {
        // Connect to the InfluxDB container
        using var client = new InfluxDBClient(_url, _token);
        var queryApi = client.GetQueryApi();

        // This is a standard Flux query to get the last recorded value in the last 15 mins.
        // You will need to change "_measurement" and "_field" to match your setup.
        string flux = $@"
            from(bucket: ""{_bucket}"")
              |> range(start: -15m)
              |> filter(fn: (r) => r[""_measurement""] == ""LoRa_Test_DB_2"") 
              |> filter(fn: (r) => r[""_field""] == ""temperature"")
              |> last()";

        try
        {
            var tables = await queryApi.QueryAsync(flux, _org);

            // Check if we actually got data back
            if (tables != null && tables.Any() && tables[0].Records.Any())
            {
                var record = tables[0].Records[0];
                return Convert.ToSingle(record.GetValue());
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error querying InfluxDB: {ex.Message}");
        }

        return 0f; // Fallback value if query fails or no data is found
    }
}