using System;
using System.Collections.Generic;
using ANT_Managed_Library;
using UnityEngine;

namespace Sensors.ANT
{
    public struct HrSensorData
    {
        public float HeartRate;
    }

    public class HrReceiver
    {
        private AntChannel backgroundScanChannel;
        private AntChannel deviceChannel;
        private HrSensorData sensorData;

        public int DeviceID { get; } = 0;
        public bool Connected { get; private set; } = false;
        public List<AntDevice> ScanResult { get; private set; }
        public HrSensorData SensorData => sensorData;


        public HrReceiver()
        {
        }

        public HrReceiver(int deviceID) => this.DeviceID = deviceID;

        //Start a background Scan to find the device
        public void StartScan()
        {
            Debug.Log("Looking for ANT + HeartRate sensor");
            AntManager.Instance.Init();
            ScanResult = new List<AntDevice>();
            backgroundScanChannel = AntManager.Instance.OpenBackgroundScanChannel(0);
            backgroundScanChannel.onReceiveData += ReceivedBackgroundScanData;
        }

        void ReceivedBackgroundScanData(Byte[] data)
        {
            byte deviceType = (data[12]); // extended info Device Type byte

            switch (deviceType)
            {
                case AntplusDeviceType.HeartRate:
                {
                    int deviceNumber = (data[10]) | data[11] << 8;
                    byte transType = data[13];
                    foreach (AntDevice d in ScanResult)
                    {
                        if (d.deviceNumber == deviceNumber && d.transType == transType) //device already found
                            return;
                    }

                    AntDevice foundDevice = new AntDevice();
                    foundDevice.deviceType = deviceType;
                    foundDevice.deviceNumber = deviceNumber;
                    foundDevice.transType = transType;
                    foundDevice.period = 8070;
                    foundDevice.radiofreq = 57;
                    foundDevice.name = "heartrate(" + foundDevice.deviceNumber + ")";
                    ScanResult.Add(foundDevice);
                    if (deviceNumber == DeviceID)
                    {
                        Debug.Log($"Desired HR Sensor with id {deviceNumber} found!");
                        ConnectToDevice(foundDevice);
                    }
                    else
                    {
                        Debug.Log($"HR sensor ({deviceNumber}) found and added to ScanResult");
                    }

                    break;
                }
            }
        }

        void ConnectToDevice(AntDevice device)
        {
            AntManager.Instance.CloseBackgroundScanChannel();
            byte channelID = AntManager.Instance.GetFreeChannelID();
            deviceChannel = AntManager.Instance.OpenChannel(ANT_ReferenceLibrary.ChannelType.BASE_Slave_Receive_0x00,
                channelID, (ushort) device.deviceNumber, device.deviceType, device.transType, (byte) device.radiofreq,
                (ushort) device.period, false);
            Connected = true;
            deviceChannel.onReceiveData += Data;
            deviceChannel.onChannelResponse += ChannelResponse;

            deviceChannel.hideRXFAIL = true;
        }


        //Deal with the received Data
        private void Data(Byte[] data)
        {
            sensorData.HeartRate = (data[7]);
        }


        void ChannelResponse(ANT_Response response)
        {
        }
    }
}