using System;
using InfluxDB.Client.Flux;

namespace OutputServiceTSDB.InfluxDB
{
	public class InfluxReader
	{

        private readonly char[] Token = "".ToCharArray();

        public InfluxReader()
		{
			//
			// TODO: Add constructor logic here
			//
		}

		public MeasurementObject Read()
        {
            var fluxClient = FluxClientFactory.Create("http://localhost:8086/");

            var fluxQuery = "from(bucket: \"telegraf\")\n"
                               + " |> filter(fn: (r) => (r[\"_measurement\"] == \"cpu\" AND r[\"_field\"] == \"usage_system\"))"
                               + " |> range(start: -1d)"
                               + " |> sample(n: 5, pos: 1)";

            fluxClient.QueryAsync(fluxQuery, (cancellable, record) =>
            {
                // process the flux query records
                Console.WriteLine(record.GetTime() + ": " + record.GetValue());
            },
                            (error) =>
                            {
                                // error handling while processing result
                                Console.WriteLine(error.ToString());

                            }, () =>
                            {
                                // on complete
                                Console.WriteLine("Query completed");
                            }).GetAwaiter().GetResult();
            return new MeasurementObject { DeviceID = "south", Probability = 0.5, Time = DateTime.UtcNow };
        }
    }
}