using LibrarySDR.Enums;
using LibrarySDR.Requests;
using System;
using System.Globalization;
using System.Text;
using static LibrarySDR.Helpers.BinaryHexHelper;

namespace LibrarySDR.Responses
{
    public class StatusResponse
    {
        public PDUType PduType => PDUType.STATUS_REQ_RESP;

        private Int64 sourceISSI;
        public Int64 SourceISSI { get { return sourceISSI; } }

        private Int64 destinationISSI;
        public Int64 DestinationISSI { get { return destinationISSI; } }

        private ShortFormReportStatus status;
        public ShortFormReportStatus Status { get { return status; } }

        private Int64 transactionId;
        public Int64 TransactionId { get { return transactionId; } }

        private Boolean gwReport;
        public Boolean GWReport { get { return gwReport; } }

        public StatusResponse(String hexResponsePayload)
        {
            String resp = hexResponsePayload;
            int i = 0;
            int prevIdx = 0;

            // get source SSI (32 bits = 4 byte = 8 hex characters)
            String hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 4 * 2));
            Int64.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out sourceISSI);

            // get destination SSI (32 bits = 4 byte = 8 hex characters)
            hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 4 * 2));
            Int64.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out destinationISSI);

            // get status (8 bits = 1 byte = 2 hex characters)
            hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 2));
            Int16 status = 0;
            Int16.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out status);
            // convert the response into an enum
            this.status = (ShortFormReportStatus)status;

            if (resp.Length > i + 4 * 2)
            {
                // get transaction ID (32 bits = 4 byte = 8 hex characters)
                hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 4 * 2));
                Int64.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out transactionId);

                Int16 gwReport;
                // get gw report (8 bits = 1 byte = 2 hex characters)
                hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 1 * 2));
                Int16.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out gwReport);

                this.gwReport = gwReport == 1 ? true : false;
            }
        }

        public static String GetInstance(Int64 sourceISSI, Int64 destinationISSI, ShortFormReportStatus status, Int64 transactionId, bool reportRequired)
        {
            StringBuilder sb = new StringBuilder("");

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

            // Source ISSI (32 bits)
            sb.Append(GetBits(sourceISSI, 32));

            // Destination ISSI (32 bits)
            sb.Append(GetBits(destinationISSI, 32));

            // status (16 bits)
            sb.Append(GetBits((int)status, 32));

            // transaction id (32 bits)
            sb.Append(GetBits(transactionId, 32));

            // Gw Report (8 bits)
            sb.Append(GetBits(reportRequired == true ? 1 : 0, 8));

            // 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 sourceISSI, Int64 destinationISSI, ShortFormReportStatus status, Int64 transactionId, bool reportRequired)
        {
            String res = GetInstance(sourceISSI, destinationISSI, status, transactionId, reportRequired);

            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;
        }



        public override String ToString()
        {
            return $"Source ISSI : {sourceISSI}  |   Destination ISSI : {destinationISSI}   |  Transaction ID : {transactionId}   |  Status : {status}    |   Report required : {gwReport}";
        }
    }
}