using System;
using System.Collections.Generic;
using Xylem.Common.CommonCore.Consts;
using Xylem.Common.Hardware.Interfaces.Ports.PortCore.EventArguments;
using Xylem.Common.Hardware.Interfaces.Ports.SerialPorts;
using Xylem.Common.Hardware.WaterMeter.Genesis.Protocols.StreamingProtocol;

namespace Xylem.Common.Hardware.WaterMeter.Genesis.GenesisCore
{
    /// <summary>
    /// Check the positioning of the streaming LED to validate the quality of the communication line
    /// </summary>
    public class GenesisMeterStreamingQuality : GenesisMeter
    {
        /// <summary>
        /// Backup of last quality
        /// </summary>
        public QualityResult LastQualityResult;

        private StreamingDecoder _sd;
        /// <summary>
        /// Quality check is active
        /// </summary>
        public Boolean IsRunning;
        private DateTimeOffset? _startTime;
        private DateTimeOffset? _stopTime;
        private List<String> _collectedRecords;

        private Int32? _tillDecodedCount;
        /// <summary>
        /// Kick off the streaming quality check.
        /// </summary>
        /// <param name="tillDecodedCount"></param>
        /// <exception cref="ApplicationException"></exception>
        public void StartStreamingQualityCheck(Int32? tillDecodedCount = null)
        {

            if (IsRunning)
            {
                return;
            }
            _tillDecodedCount = tillDecodedCount;
            if (_tillDecodedCount.HasValue)
            {
                _sd = new StreamingDecoder(false);
            }
            if (StreamingPort == null || !(StreamingPort is LedSerialPort))
            {
                throw new ApplicationException("No valid streaming port");
            }

            _stopTime = null;
            _collectedRecords = new List<String>();

            SyncStreamingBuffer(SyncMarkRecord.DecodeEveryPackage);
            ((LedSerialPort)StreamingPort).OnRawRecordReceived += GenesisMeterStreamingQuality_OnRawRecordReceived;
            _startTime = DateTimeOffset.UtcNow;
            LogRawData(true);
            IsRunning = true;
        }

        private void GenesisMeterStreamingQuality_OnRawRecordReceived(Object sender, BasePortDataEventArgs e)
        {
            _collectedRecords.Add(e.GetData().ToString());
            if (_tillDecodedCount.HasValue)
            {
                if (_sd.DecodeMsg(e.GetData().ToString()))
                {
                    _tillDecodedCount = _tillDecodedCount.Value - 1;
                    if (_tillDecodedCount <= 0)
                    {
                        IsRunning = false;
                        LastQualityResult = StopStreamingQualityCheck(10);
                    }
                }

            }
        }

        /// <summary>
        /// Stop the streaming check.
        /// </summary>
        /// <param name="sampleRateHz"></param>
        /// <returns></returns>
        /// <exception cref="ApplicationException"></exception>
        public QualityResult StopStreamingQualityCheck(Int32 sampleRateHz)
        {
            _stopTime = DateTimeOffset.UtcNow;

            if (!IsRunning && !_startTime.HasValue)
            {
                return new QualityResult();
            }

            if (StreamingPort == null || !(StreamingPort is LedSerialPort))
            {
                throw new ApplicationException("No valid streaming port");
            }
            LogRawData(false);
            ((LedSerialPort)StreamingPort).OnRawRecordReceived -= GenesisMeterStreamingQuality_OnRawRecordReceived;
            SyncStreamingBuffer(SyncMarkRecord.SkipDecoding);
            IsRunning = false;
            if (_stopTime != null && _startTime != null)
                return new QualityResult(_collectedRecords, _stopTime.Value - _startTime.Value, sampleRateHz);
            return new QualityResult();
        }

        /// <summary>
        /// 
        /// </summary>
        public class QualityResult
        {
            /// <summary>
            /// Number of records received (read line for LED message)
            /// </summary>
            public readonly Int32 TotalLinesCount;
            /// <summary>
            /// Total records decoded
            /// </summary>
            public readonly Int32 TotalDecodedCount;
            /// <summary>
            /// Total errors
            /// </summary>
            public readonly Int32 TotalTransportErrorCount;
            /// <summary>
            /// Validated without errors
            /// </summary>
            public readonly Int32 TotalValidationWithoutErrorsCount;
            /// <summary>
            /// Expected lines
            /// </summary>
            public readonly Int32 ExpectedLinesCount;
            /// <summary>
            /// Time
            /// </summary>
            public readonly TimeSpan TotalTime;
            /// <summary>
            /// Error counter
            /// </summary>
            public readonly Dictionary<UInt16, Int32> ErrorOccurredCounter;

            /// <summary>
            /// The real result of quality check
            /// </summary>
            /// <param name="collectedRecords"></param>
            /// <param name="ts"></param>
            /// <param name="sampleRateHz"></param>
            public QualityResult(List<String> collectedRecords, TimeSpan ts, Int32 sampleRateHz)
            {
                TotalLinesCount = collectedRecords.Count;
                TotalTime = ts;
                ExpectedLinesCount = (Int32)(Math.Round(ts.TotalSeconds * sampleRateHz, 0));
                ErrorOccurredCounter = new Dictionary<UInt16, Int32>();
                foreach (var rawText in collectedRecords)
                {
                    var sd = new StreamingDecoder(false);
                    if (!sd.DecodeMsg(rawText))
                    {
                        TotalTransportErrorCount++;
                        continue;
                    }
                    //here the decoding is valid including the CRC
                    TotalDecodedCount++;

                    //the DecodeMsg has assigned either a DataCalib or DataFlowTest data set
                    var calibrationRecord = sd.DataCalib;
                    var flowTestRecord = sd.DataFlowTest;

                    if (flowTestRecord != null)
                    {
                        TotalValidationWithoutErrorsCount++;
                        continue;
                    }

                    if (calibrationRecord != null)
                    {
                        if (calibrationRecord.Validation == 0)
                        {
                            TotalValidationWithoutErrorsCount++;
                        }
                        else
                        {
                            if (ErrorOccurredCounter.ContainsKey(calibrationRecord.Validation))
                            {
                                ErrorOccurredCounter[calibrationRecord.Validation] += 1;
                            }
                            else
                            {
                                ErrorOccurredCounter.Add(calibrationRecord.Validation, 1);
                            }
                        }
                    }
                }
            }

            /// <summary>
            /// The quality result as dummy zero
            /// </summary>
            public QualityResult()
            {
                TotalLinesCount = 0;
                TotalTime = TimeSpan.Zero;
                ErrorOccurredCounter = new Dictionary<UInt16, Int32>();
            }
        }
    }
}