///
/// Copyright (c) 2013-2016 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO.Ports;
using System.Text;
using log4net;
using Config.Entities;
using TBF.BenchControl.Generic;
using TBF.Boxes;

namespace TBF.BenchControl.Ambient.Greco
{
    /// <summary>
    /// Ambient temperature / humidity / pressure meter 'Greco' connected via serial interface (RS232)
	/// Connection settings: 19200 Bd 8-bits No-parity 1-stop-bit Flow control: none or hardware.
	/// </summary>
	public class Ambient : ComponentBase, IDevice, IOperation, GenericDevices.IAmbient
    {
		private static readonly ILog log = LogManager.GetLogger(typeof(Ambient));
		public override string ToString() { return string.Format("Ambient({0})", Cfg.ToString(1)); }

		private readonly AmbientCfg ambientCfg;

		/// Private fields
		SerialPort serialPort;
		StringBuilder measurementBuilder;

		/// <summary>The state of the measurement</summary>
		MsrmntState msrmntState;

        ///
        /// Measured values when MsrmntState == MsrmntState.Valid
        ///
        float temperature;      /// [deg C]
        float pressure;         /// [bar]
        float humidity;         /// [%]

		/// <summary>Measurement time stamp when MsrmntState == MsrmntState.Valid</summary>
		int msrmntTimeStamp;

		public Ambient()
		{
		}

		/// <summary>
		/// Ambient temperature / humidity / pressure meter 'Greco' connected via serial interface (RS232)
		/// Connection settings: 19200 Bd 8-bits No-parity 1-stop-bit Flow control: none or hardware.
		/// </summary>
		public Ambient(AmbientCfg cfg, IList<Generic.IComponent> components)
			: this(cfg)
		{
		}

		public Ambient(Generic.IComponentCfg cfg)
            : base(cfg)
        {
			ambientCfg = cfg as AmbientCfg;
			log.Debug(this.ToString());
		}

		public void Initialize()
		{
			if (ambientCfg.DebugLevel == DebugMode.Simulate)
			{
				temperature = 20.0f;
				humidity = 40.0f;
				pressure = 1.0f;
				msrmntTimeStamp = StateMachine.Time;
				msrmntState = MsrmntState.Valid;
				return;
			}

			string comPortName = "COM" + ambientCfg.ComPortNr.ToString();
			serialPort = new SerialPort(comPortName, ambientCfg.BaudRate, ambientCfg.Parity, ambientCfg.DataBits, ambientCfg.StopBits);
			serialPort.Handshake = ambientCfg.Handshake;
			serialPort.Open();
			measurementBuilder = new StringBuilder(40);
			msrmntState = MsrmntState.Busy;

            log.FatalFormat("Successfully initialized device {0}", ToString());
        }

        /// <summary>Run this device</summary>
        public void RunDeviceBefore()
        {
			if (ambientCfg.DebugLevel == DebugMode.Simulate ||
				ambientCfg.DebugLevel == DebugMode.FailureDuringOperation)
			{
				msrmntTimeStamp = StateMachine.Time;
				return;
			}

			try
			{
				measurementBuilder.Append(serialPort.ReadExisting());
				int len = measurementBuilder.Length;

				///
				/// Device sends each 20 sec one line of ASCII text with data in the following format:
				///		(temp)		6 characters, two decimal digits, with leading spaces
				///		TAB			1 character
				///		(humi)		6 characters, two decimal digits, with leading spaces
				///		TAB			1 character
				///		(pressure)	6 characters, one decimal digits, with leading spaces is LT 1000
				///		CR + LF		2 characters
				/// Example:
				///  23.42   38.08  1061.1
				///  23.39   38.04  1060.8
				///  23.39   38.08  1061.4
				///
				if (len >= 22)
				{
					string measurement = measurementBuilder.ToString();
					measurementBuilder.Clear();

					float t = 0;
					float h = 0;
					float p = 0;
					if (float.TryParse(measurement.Substring(len - 22, 6), NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingWhite,
										CultureInfo.InvariantCulture, out t) &&
						measurement[len - 16] == '\t' &&
						float.TryParse(measurement.Substring(len - 15, 6), NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingWhite,
										CultureInfo.InvariantCulture, out h) &&
						measurement[len - 9] == '\t' &&
						float.TryParse(measurement.Substring(len - 8, 6), NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingWhite,
										CultureInfo.InvariantCulture, out p) &&
						measurement[len - 2] == '\r' &&
						measurement[len - 1] == '\n')
					{
						temperature = t;
						humidity = h;
						pressure = p / 1000.0F;
						msrmntTimeStamp = StateMachine.Time;
						msrmntState = MsrmntState.Valid;

						log.InfoFormat("Ambient: temperature = {0} C, humidity = {1} %, pressure = {2} mbar", temperature.ToString("F1"), humidity.ToString("F1"), (1000 * pressure).ToString("F0"));
					}
					else
					{
						log.Warn("Invalid string received: " + measurement);
					}
				}
			}
			catch (Exception e)
			{
				DebugLevel = DebugMode.FailureDuringOperation;
				serialPort = null;

				log.FatalFormat("Ambient: Serail port read failure : {0}", e.Message);
				if (e.InnerException != null)
				{
					log.FatalFormat("InnerMessage : {0}", e.InnerException.Message);
				}
			}
        }

        /// <summary>Run this device</summary>
        public void RunDeviceAfter()
        {
        }

        /// <summary>Stop this device</summary>
        public void StopDevice()
        {
            if (serialPort != null) serialPort.Close();
        }

		public void StopDevice2() { }

		///
		/// Boxes for the operation result
		///
		FloatBox tempBox;
		FloatBox pressureBox;
		FloatBox humiBox;

		public IOperation ReadAmbientOp(FloatBox temperature, FloatBox pressure, FloatBox humidity)
		{
			this.tempBox     = temperature;
			this.pressureBox = pressure;
			this.humiBox     = humidity;
			return this;
		}

		/// <summary>Start this operation</summary>
		public void Start()
		{
            if (tempBox     != null) tempBox.Val     = temperature;
            if (pressureBox != null) pressureBox.Val = pressure;
            if (humiBox     != null) humiBox.Val     = humidity;
        }

		/// <summary>Run this operation</summary>
		/// <returns>
		///		Event.FlowInDone or Event.FlowOutDone
		/// </returns>
		public Event Run()
		{
            if (tempBox     != null) tempBox.Val     = temperature;
            if (pressureBox != null) pressureBox.Val = pressure;
            if (humiBox     != null) humiBox.Val     = humidity;
            return Event.AmbientDone;
		}

		/// <summary>Stop this operation</summary>
		public void Stop()
		{
		}
	}
}