using System;
using System.Collections.Generic;
using DTS.Common.DASResource;
using DTS.Common.Enums.DASFactory;
using DTS.Common.ICommunication;
using DTS.Common.Utilities.Logging;

namespace DTS.DASLib.Command.SLICE.DownloadCommands
{
    public class QueryEventDataBase : EventDataCommands
    {
        protected override Commands Command => Commands.QueryEventData;
        private const ushort ADC_OFFSET = 0x8000;

        public const byte ALL_CHANNELS = 0xFF;

        protected UInt16 _eventNumber;
        protected UInt64 _firstSample;
        protected UInt64 _lastSample;
        protected UInt64 _samplesDownloaded;
        protected byte _channel;
        protected int _channelsDownloaded;
        protected ushort[] _data;

        public UInt16 EventNumber
        {
            get => _eventNumber;
            set { _eventNumber = value; command.SetParameter(0, _eventNumber); }
        }

        public virtual UInt64 FirstSample
        {
            get => _firstSample;
            set { _firstSample = value; command.SetParameter(2, _firstSample); }
        }

        public virtual UInt64 LastSample
        {
            get => _lastSample;
            set { _lastSample = value; command.SetParameter(10, _lastSample); }
        }

        public byte Channel
        {
            get => _channel;
            set
            {
                _channel = value; command.SetParameter(18, _channel);
                ChannelsDownloaded = 0xFF == _channel ? 3 : 1;
            }
        }

        public int ChannelsDownloaded
        {
            get => _channelsDownloaded;
            set => _channelsDownloaded = value;
        }

        public int Count => (int)_samplesDownloaded;

        public QueryEventDataBase(DTS.Common.Interface.DASFactory.ICommunication sock)
            : base(sock)
        {
            command.Parameter = new byte[19];
            _data = null;

            _eventNumber = 0;
            _firstSample = 0;
            _lastSample = 0;
            _channel = 0;

            command.ShouldLog = false;
        }

        public QueryEventDataBase(DTS.Common.Interface.DASFactory.ICommunication sock, int timeoutMillisec)
            : base(sock, timeoutMillisec)
        {
            command.Parameter = new byte[19];
            _data = null;

            _eventNumber = 0;
            _firstSample = 0;
            _lastSample = 0;
            _channel = 0;

            command.ShouldLog = false;
        }

        public override void Execute(CommandCallback cb, object cbData)
        {
            // Do a little parameter checking
            if (_firstSample > _lastSample)
            {
                // "QueryEventData.Execute: First Sample cannot be greater than Last Sample"
                throw new ApplicationException(Strings.QueryEventData_Execute_Err1);
            }
            base.Execute(cb, cbData);
        }

        protected override CommandReceiveAction WholePackagePost()
        {
            // now send the data to the user
            var stat = CommandStatus.Success;
            if (response.Status != DFConstantsAndEnums.CommandStatus.StatusNoError)
            {
                var s = (int)response.Status;
                APILogger.LogString("QueryEventData.WholePackagePost: reporting failure, status==" + CommandPacketBase.StatusLabels[s] + " (0x" + s.ToString("X") + ")");
                stat = CommandStatus.Failure;
            }
            var cbReport = new QueryEventDataReport(stat, UserCallbackData);
            cbReport.Data = new short[_channelsDownloaded][];
            for (var i = 0; i < _channelsDownloaded; i++)
                GetChannelData(i, out cbReport.Data[i]);
            return UserCallback(cbReport);
        }

        protected override CommandReceiveAction WholePackage()
        {
            if (response.Status != DFConstantsAndEnums.CommandStatus.StatusNoError)
            {
                return CommandReceiveAction.StopReceiving;
            }
            _samplesDownloaded = (ulong)(response.Parameter.Length / 2) / (ulong)_channelsDownloaded;
            _data = new ushort[_samplesDownloaded * (ulong)_channelsDownloaded];
            for (var i = 0; (ulong)i < _samplesDownloaded * (ulong)_channelsDownloaded; i++)
            {
                response.GetParameter(2 * i, out _data[i]);
            }
            return CommandReceiveAction.StopReceiving;
        }

        public override void SyncExecute()
        {
            // Do a little parameter checking
            if (_firstSample > _lastSample)
            {
                // "QueryEventData.SyncExecute: First Sample cannot be greater than Last Sample"
                throw new ApplicationException(Strings.QueryEventData_SyncExecute_Err1);
            }
            base.SyncExecute();
        }

        public virtual void GetChannelData(int channel, out short[] signedADC)
        {
            if (channel < 0 || channel > _channelsDownloaded)
            {
                // "QueryEventData.GetChannelData: Data requested on a channel that wasn't downloaded."
                throw new ApplicationException(Strings.QueryEventData_GetChannelData_Err1);
            }

            // Data order for a 9 channel stack
            // 7 8 9 4 5 6 1 2 3 7 8 9 4 5 6 1 2 3 etc.

            var rv = new short[_samplesDownloaded];
            var sliceNumber = channel / 3;
            var sliceOffset = (_channelsDownloaded / 3 - sliceNumber - 1) * 3;
            if (sliceOffset < 0) sliceOffset = 0;
            var channelInSlice = channel % 3;
            for (var i = 0; i < rv.Length; i++)
            {
                rv[i] = (short)(_data[i * _channelsDownloaded + sliceOffset + channelInSlice] - ADC_OFFSET);
            }
            signedADC = rv;
        }

        public virtual void GetRawIndexedData(int index, out ushort[] data)
        {
            data = new ushort[_samplesDownloaded];
            for (var i = 0; i < data.Length; i++)
            {
                data[i] = _data[i * _channelsDownloaded + index];
            }
        }

        public override void CommandToString(ref List<List<string>> lines)
        {
            lines.Add(new List<string> { $"Event number: {EventNumber}, First sample: {FirstSample}, Last sample: {LastSample}" });
        }

        public override void ResponseToString(ref List<List<string>> lines)
        {
            lines.Add(new List<string>
            {
                $"ChannelsDownloaded: {ChannelsDownloaded}, Count: {Count}"
            });
        }

        public void LogResponse()
        {
            LogCommand(false);
        }
    }
}