using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Text;

namespace EFBTracker.Tracking
{
    public class Packet
    {
        private string Type { get; set; }
        private float[]? Data { get; set; }

        public Packet(string type, float[] data){
            Type = type;
            Data = data;
        }

        public static Packet[]? ReadPackets(byte[] data){


            if((data.Length - 5) % 36 == 0){//If there are correctly sized packets
                int packetPos = 0;
                List<Packet> packets = new List<Packet>();

                //Next 4 bytes are packet header
                string header = Encoding.UTF8.GetString(data, packetPos, 4);
                packetPos += 5;

                while(packetPos < data.Length)
                {

                    int id = BitConverter.ToInt32(data, packetPos);
                    packetPos += 4;

                    //Array to take 4 values
                    float[] values = new float[4];

                    for (var i = 0; i < values.Length; i++)
                    {//Read 4 values from packet and save into array
                        var value = BitConverter.ToSingle(data, packetPos);
                        values[i] = value;
                        packetPos += 8;
                    }

                    //Generate new packet object and add to list
                    packets.Add(new Packet(header, values));
                }
                return packets.ToArray();
            }

            return null;
        }
        
    }
}