using LibrarySDR.Enums;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static LibrarySDR.Helpers.BinaryHexHelper;

namespace LibrarySDR.Requests
{
    public class GroupMonitorRequest
    {
        private static PDUType PduType = PDUType.GROUP_MONITOR_REQ;

        public static String GetInstance(Int64 gatewayISSI, bool shouldMonitor, List<Int64> groupIds)
        {
            StringBuilder sb = new StringBuilder("");

            // PDU Type (8 bits)
            sb.Append(GetBits((int)PduType, 8));

            // gateway ISSI (32 bits)
            sb.Append(GetBits(gatewayISSI, 32));

            // Monitor (8 bits)
            sb.Append(GetBits(shouldMonitor ? 1 : 0, 8));

            // number of monitored groups, up to 5 groups (16 bits)
            sb.Append(GetBits(groupIds.Count, 16));

            // add each group id to the list
            foreach(Int64 groupId in groupIds)
                sb.Append(GetBits(groupId, 32));

            // get the header with the length
            String header = Header.GetHeaderBinary(sb.ToString().Length / 8);

            // add header in front of the request
            return BinaryStringToHexString($"{header}{sb.ToString()}", Padding.RIGHT);
        }

        public static byte[] GetBytes(Int64 gatewayISSI, bool shouldMonitor, List<Int64> groupIds)
        {
            String res = GetInstance(gatewayISSI, shouldMonitor, groupIds);

            byte[] response = new byte[res.Length / 2];

            for (int i = 0; i < res.Length / 2; i++)
                response[i] = (byte)Convert.ToInt16(res.Substring(i * 2, 2), 16);

            return response;
        }


    }
}