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

namespace LibrarySDR.Responses
{
    public class GwSDSReportResponse
    {
        public PDUType PduType => PDUType.REPORT_REQ_RESP;

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

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

        private ProtocolIdentifier pi;
        public ProtocolIdentifier ProtocolIdentifier { get { return pi; } }

        private Int16 messageReference;
        public Int16 MessageRefence { get { return messageReference; } }

        private Int16 areaSelection;
        public Int16 AreaSelection { get { return areaSelection; } }

        private Int16 validityPeriod;
        public Int16 ValidityPeriod { get { return validityPeriod; } }


        private Int64 forwardAddress;
        public Int64 ForwardAddress { get { return forwardAddress; } }

        private ReportFlag reportFlag;
        public ReportFlag ReportFlag { get { return reportFlag; } }

        private DeliveredStatus deliveryStatus;
        public DeliveredStatus DeliveryStatus { get { return deliveryStatus; } }

        public GwSDSReportResponse(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 protocol identifier (8 bits = 1 byte = 2 hex characters)
            Int16 pi = 0;
            hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 2));
            Int16.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out pi);
            this.pi = (ProtocolIdentifier)pi;

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

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

            // get delivery status (8 bits = 1 byte = 2 hex characters)
            Int16 deliveryStat = 0;
            hex = LittleToBigEndianHexString(resp.Substring(i = i + prevIdx, prevIdx = 2));
            Int16.TryParse(hex, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out deliveryStat);

            // parse the data flag
            deliveryStatus = (DeliveredStatus)deliveryStat;

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

            // get forward address (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 forwardAddress);

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

            // parse the report flag
            reportFlag = new ReportFlag(repFlag);
        }

        public static String GetInstance(Int64 sourceISSI, Int64 destinationISSI, ProtocolIdentifier protocolIdentifier,  Int16 messageReference, 
            DeliveredStatus deliveryStatus)
        {
            StringBuilder sb = new StringBuilder("");

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

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

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

            // Protocol Identifier (8 bits)
            sb.Append(GetBits((int)protocolIdentifier, 8));

            // Message Reference (8 bits)
            sb.Append(GetBits((int)messageReference, 8));

            // Area selection (8 bits)
            sb.Append(GetBits((int)0x00, 8));

            // Delivery Status (8 bits)
            sb.Append(GetBits((int)deliveryStatus, 8));

            // Validity period (8 bits)
            sb.Append(GetBits((int)0x00, 8));

            // Forward address (32 bits)
            sb.Append(GetBits((int)0x00, 32));

            // Flags (8 bits)
            sb.Append(GetBits((int)0x00, 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, ProtocolIdentifier protocolIdentifier, Int16 messageReference,
            DeliveredStatus deliveryStatus)
        {
            String res = GetInstance(sourceISSI, destinationISSI, protocolIdentifier, messageReference, deliveryStatus);

            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}   |  Message Ref : {messageReference}   |  Delivery Status : {deliveryStatus} ";
        }
    }
}