using System;
using System.Configuration;
using System.Data;
using JetBrains.Annotations;


public sealed class BikeSensorData
{
    #region signleton

    private static readonly Lazy<BikeSensorData>
        lazy =
            new Lazy<BikeSensorData>
                (() => new BikeSensorData());

    public static BikeSensorData Instance => lazy.Value;

    #endregion

    [CanBeNull] private PowerMeterReceiver powerMeterReceiver;
    [CanBeNull] private SpeedSensorReceiver speedSensorReceiver;
    [CanBeNull] private HrReceiver hrReceiver;
    [CanBeNull] private PolarReceiver polarReceiver;

    public SpeedSensorData? SpeedData => speedSensorReceiver?.SensorData;
    public PowermeterSensorData? PowermeterData => powerMeterReceiver?.SensorData;
    public HRSensorData? HrData => hrReceiver?.SensorData;
    public PolarSensorData? PolarData => polarReceiver?.SensorData;

    private BikeSensorData()
    {
    }

    public void StartListening(SpeedSensorConfig? speedSensorConfig = null,
        PolarSensorConfig? polarSensorConfig = null, int? powermeterId = null, int? hrAntId = null)
    {

        if(speedSensorReceiver != null)
        {
            throw new InvalidConstraintException(
                "BikeSensorData: Already listening to Speed Sensor");
        }
        if(hrReceiver != null)
        {
            throw new InvalidConstraintException(
                "BikeSensorData: Already listening to HR Sensor");
        }

        if (polarReceiver != null)
        {
            throw new InvalidConstraintException(
                "BikeSensorData: Already listening to Polar Sensor");
        }
        if (powerMeterReceiver != null)
        {
            throw new InvalidConstraintException(
                "BikeSensorData: Already listening to Power Sensor");
        }
        
        if (speedSensorConfig != null)
        {
            speedSensorReceiver = new SpeedSensorReceiver(speedSensorConfig.Value);
            speedSensorReceiver.StartScan();
        }

        if (hrAntId != null)
        {
            hrReceiver = new HrReceiver(hrAntId.Value);
            hrReceiver.StartScan();
        }

        if (powermeterId != null)
        {
            powerMeterReceiver = new PowerMeterReceiver(powermeterId.Value);
            powerMeterReceiver.StartScan();
        }

        if (polarSensorConfig != null)
        {
            polarReceiver = new PolarReceiver(polarSensorConfig.Value); //automatically starts listening
        }
        
    }

    public void Dispose()
    {
        polarReceiver?.Dispose();
        //TODO: also dispose ANT sensors?

        polarReceiver = null;
        speedSensorReceiver = null;
        powerMeterReceiver = null;
        hrReceiver = null;
    }
}