//                           UNCLASSIFIED
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-------------------------------------------------------------------------*/

using System;
using Raytheon.Instruments.Dmm;
using Raytheon.Units;
using System.IO.Ports;
using NLog;
using Raytheon.Common;

namespace Raytheon.Instruments
{
	/// <summary>
	/// A Space Electronics (Squib meter) of the DMM interface
	/// </summary>
	public class DMMSquibMeter101SQBRAK : IDmm, IDisposable
	{
		#region PrivateMemberVariables

		private string _name;
		private readonly string _address;
		private readonly SerialPort _serialPort;
		private MeasurementFunction _lastType;
		private double _lastRange;
		private double _lastResolution;
		private State _state;
		private SelfTestResult _selfTestResult;
		private byte[] _readBuffer;
		private string versionInfo;

		/// <summary>
		/// NLog logger
		/// </summary>
		private readonly ILogger _logger;
		/// <summary>
		/// Raytheon configuration
		/// </summary>
		private readonly IConfigurationManager _configurationManager;
		private readonly IConfiguration _configuration;

		#endregion

		#region PrivateFunctions

		/// <summary>
		/// Dispose of this objects resources
		/// </summary>
		/// <param name="disposing"></param>
		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2213:DisposableFieldsShouldBeDisposed", MessageId = "_34461A")]
		protected virtual void Dispose(bool disposing)
		{
			try
			{
				if (disposing)
				{
					if (_state == State.Ready)
					{
						IOWrite("RST"); // send reset command
						IOWrite("LM"); // sets squib meter to local mode (it is set to remote in initilize)

						_serialPort.Close();

						_state = State.Uninitialized;
					}
				}
			}
			catch (Exception)
			{
				try
				{
					//ErrorLogger.Instance().Write(err.Message + "\r\n" + err.StackTrace);
				}
				catch (Exception)
				{
					//Do not rethrow. Exception from error logger that has already been garbage collected
				}
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="data"></param>
		/// <returns></returns>
		private string ConvertToString(ref byte[] data)
		{
			string rsp = System.Text.Encoding.ASCII.GetString(data);
			return rsp;
		}

		/// <summary>
		/// Send a command to the squib meter and get the response.
		/// </summary>
		/// <param name="commandString">The command to send.</param>
		/// <returns>The squib meter response as string.</returns>

		private string IOQuery(string commandString)
		{
			// Flush squib meter buffer
			_serialPort.Write("FS");

			// clear our buffer
			Array.Clear(_readBuffer, 0, _readBuffer.Length);

			// send the data out
			_serialPort.Write(commandString);

			// read from the response
			int numBytesRead = _serialPort.Read(_readBuffer, 0, _readBuffer.Length);

			// convert response to a string
			string rspStr = ConvertToString(ref _readBuffer);

			// split out the command responce from the return data (divided by carriage return)
			string[] result = rspStr.Split(new string[] { "\n", "\r\n", "<CR>" }, StringSplitOptions.None);

			// Check command responce (0 = OK)
			if (result[0] == "1")
			{
				throw new Exception("Unknown Command");
			}
			if (result[0] == "2")
			{
				throw new Exception("Command now allowed in present mode");
			}

			return result[1];
		}

		/// <summary>
		/// Sends a serial Command to the instrument.
		/// </summary>
		/// <param name="commandString">The serial Command to be sent to the instrument.</param>
		private void IOWrite(string commandString)
		{
			// note each command sent has different return data/status/error formatting, IOWrite is just a direct write
			// IOQuery will do a read, and return all the data    

			// send command to serial port
			_serialPort.Write(commandString);
		}


		#endregion

		#region PublicFunctions

		/// <summary>
		/// DMMSquibMeter101SQBRAK factory constructor
		/// </summary>
		/// <param name="deviceName"></param>
		/// <param name="configurationManager"></param>
		public DMMSquibMeter101SQBRAK(string deviceName, IConfigurationManager configurationManager, ILogger logger)
		{
			Name = deviceName;

			_logger = logger;

			_configurationManager = configurationManager;
			_configuration = _configurationManager.GetConfiguration(Name);

			string comPortName = _configuration.GetConfigurationValue("DMMSquibMeter101SQBRAK", "ComPortName", "COM1");
			_address = comPortName;
			int baudRate = _configuration.GetConfigurationValue("DMMSquibMeter101SQBRAK", "BaudRate", 9600);
			Parity parity = _configuration.GetConfigurationValue("DMMSquibMeter101SQBRAK", "Parity", Parity.None);
			int dataBits = _configuration.GetConfigurationValue("DMMSquibMeter101SQBRAK", "DataBits", 8);
			StopBits stopBits = _configuration.GetConfigurationValue("DMMSquibMeter101SQBRAK", "StopBits", StopBits.One);

			_serialPort = new SerialPort(comPortName, baudRate, parity, dataBits, stopBits);
			_lastType = 0;
			_lastRange = 0;
			_lastResolution = 0;
			_readBuffer = new byte[1000];

			//created in Initialize()

			_state = State.Uninitialized;
			_selfTestResult = SelfTestResult.Unknown;
		}

		/// <summary>
		/// The constructor which opens the handle to the DMM and performs a self test on the instrument
		/// </summary>
		/// <param name="name">The name of this dmm</param>
		/// <param name="address">The address of the DMM</param>
		public DMMSquibMeter101SQBRAK(string name, string comPortName, int baudRate = 9600, Parity parity = Parity.None, int dataBits = 8, StopBits stopBits = StopBits.One)
		{
			_name = name;
			_address = comPortName;
			_serialPort = new SerialPort(comPortName, baudRate, parity, dataBits, stopBits);
			_lastType = 0;
			_lastRange = 0;
			_lastResolution = 0;
			_readBuffer = new byte[1000];
			_logger = LogManager.GetCurrentClassLogger();

			//created in Initialize()

			_state = State.Uninitialized;
			_selfTestResult = SelfTestResult.Unknown;
		}

		
		/// <summary>
		/// The Finalizer which will release resources if required
		/// </summary>
		~DMMSquibMeter101SQBRAK()
		{
			Dispose(false);
		}

		/// <summary>
		/// 
		/// </summary>
		/// <returns></returns>
		public bool ClearErrors()
		{
			throw new NotImplementedException();  // if serial command for clearing errors add here, if not leave as is
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="type"></param>
		/// <param name="range"></param>
		/// <param name="resolution"></param>
		public void ConfigureCurrentMeasurement(MeasurementFunction type, Current range, Current resolution)
		{
			throw new NotImplementedException();  // if serial command for clearing errors add here, if not leave as is
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="type"></param>
		/// <param name="range"></param>
		/// <param name="resolution"></param>
		public void ConfigureFrequencyMeasurement(MeasurementFunction type, Frequency range, Frequency resolution)
		{
			throw new NotImplementedException();  // if serial command for clearing errors add here, if not leave as is
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="type"></param>
		/// <param name="range"></param>
		/// <param name="resolution"></param>
		public void ConfigureResistanceMeasurement(MeasurementFunction type, Resistance range, Resistance resolution)
		{
			if (type != MeasurementFunction.FourWireResistance && type != MeasurementFunction.TwoWireResistance)
			{
				throw new Exception("only FourWireResistance or TwoWireResistance is acceptable for param type: " + _lastType.ToString());
			}

			_lastType = type;
			_lastRange = range.Ohms;
			_lastResolution = resolution.Ohms;
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="type"></param>
		/// <param name="range"></param>
		/// <param name="resolution"></param>
		public void ConfigureVoltageMeasurement(MeasurementFunction type, Voltage range, Voltage resolution)
		{
			throw new NotImplementedException();  // if serial command for clearing errors add here, if not leave as is
		}

		/// <summary>
		/// 
		/// </summary>
		public string DetailedStatus
		{
			get
			{
				versionInfo = IOQuery("VR");
				return "Squib Meter version Information (Cage Code | Model Number | Serial Number | Firmware Version | Calibration Date): " + versionInfo;
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public bool DisplayEnabled
		{
			get
			{
				throw new NotImplementedException();
			}

			set
			{
				throw new NotImplementedException();
			}
		}

		/// <summary>
		/// Dispose of this objects resources
		/// </summary>
		public void Dispose()
		{
			try
			{
				Dispose(true);

				GC.SuppressFinalize(this);
			}
			catch (Exception)
			{
				try
				{
					//ErrorLogger.Instance().Write(err.Message + "\r\n" + err.StackTrace);
				}
				catch (Exception)
				{
					//Do not rethrow. Exception from error logger that has already been garbage collected
				}
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public bool FrontPanelEnabled
		{
			get
			{
				throw new NotImplementedException();
			}

			set
			{
				throw new NotImplementedException();
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public InstrumentMetadata Info
		{
			get
			{
				throw new NotImplementedException();
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public void Initialize()
		{
			if (_state == State.Uninitialized)
			{
				// Open the port
				_serialPort.Open();

				// set the squib meter to remote state 
				IOQuery("RM");

				// Ensure continuous reading is off
				IOQuery("COFF");

				// Flush FIFO buffer
				IOQuery("FS");

				_state = State.Ready;
			}
			else
			{
				throw new Exception("expected the state to be Uninitialized, state was: " + _state.ToString());
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public MeasurementFunction MeasurementType
		{
			get
			{
				throw new NotImplementedException();
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="timeout"></param>
		/// <returns></returns>
		public Current MeasureCurrent(int timeout)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="timeout"></param>
		/// <returns></returns>
		public Frequency MeasureFrequency(int timeout)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="timeout"></param>
		/// <returns></returns>
		public Resistance MeasureResistance(int timeout)
		{
			if (_lastType != MeasurementFunction.FourWireResistance && _lastType != MeasurementFunction.TwoWireResistance)
			{
				throw new Exception("only FourWireResistance or TwoWireResistance is acceptable for param type: " + _lastType.ToString());
			}

			IOQuery("SR"); //todo need to add in range values

			// send serial command to send & read response
			// set range
			// set resolution
			// any other settings that need to be sent (write) before taking measurement

			string response = IOQuery("RV");

			// parse the response //TODO Parse the return data (0= command ok, 1= unknown command, 2= command not allowed in present mode | reading | over range state | wiring error state | calibration state (ok or bad) | hardware state (ok or bad))
			double rsp = Util.ConvertStringToDouble(response); //if string is only number this is ok, if there are any other char must strip them off

			return Resistance.FromOhms(rsp);
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="timeout"></param>
		/// <returns></returns>
		public Voltage MeasureVoltage(int timeout)
		{
			throw new NotImplementedException();  // if serial command for clearing errors add here, if not leave as is
		}

		/// <summary>
		/// 
		/// </summary>
		public string Name
		{
			get { return _name; }
			set { _name = value; }
		}

		/// <summary>
		/// 
		/// </summary>
		/// <returns></returns>
		public SelfTestResult PerformSelfTest()
		{
			int testResult = 0;
			const string BatteryState = "LOW";
			string result = IOQuery("RV");

			// Set measurement input to backplane after performing self test.  Default is front panel.
			// _dmm.Measurement.In = VTEXDmmInputSelectEnum.VTEXDmmInputSelectInternal;

			if (result == BatteryState)
			{
				_selfTestResult = Raytheon.Instruments.SelfTestResult.Fail;
				throw new Exception("Battery state: " + testResult + " Battery State Message: " + result);
			}

			_selfTestResult = Raytheon.Instruments.SelfTestResult.Pass;

			return _selfTestResult;
		}

		/// <summary>
		/// 
		/// </summary>
		public void Reset()
		{
			IOWrite("RST");
		}

		/// <summary>
		/// 
		/// </summary>
		public SelfTestResult SelfTestResult
		{
			get
			{
				return _selfTestResult;
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public State Status
		{
			get
			{
				return _state;
			}
		}

		/// <summary>
		/// 
		/// </summary>
		public void Shutdown()
		{
			if (_state == State.Ready)
			{
				IOWrite("RST"); // send reset command
				IOWrite("LM"); // sets squib meter to local mode (it is set to remote in initilize)

				_serialPort.Close();

				_state = State.Uninitialized;
			}
		}

		#endregion
	}
}