using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO.Ports;
using System.Text;
using log4net;
using TBF.BenchControl.Generic;
using TBF.Boxes;

namespace TBF.BenchControl.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;

		/// <summary>Measured temperature when MsrmntState == MsrmntState.Valid</summary>
		float temperature;

		/// <summary>Measured humidity when MsrmntState == MsrmntState.Valid</summary>
		float humidity;

		/// <summary>Measured pressure when MsrmntState == MsrmntState.Valid</summary>
		float pressure;

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

		/// <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)
            : base(cfg)
        {
			ambientCfg = cfg;
			log.Debug(this.ToString());
		}

		public void Initialize()
		{
			if (ambientCfg.DebugLevel == Entities.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 == Entities.DebugMode.Simulate)
			{
				msrmntTimeStamp = StateMachine.Time;
				return;
			}

			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;
					msrmntTimeStamp = StateMachine.Time;
					msrmntState = MsrmntState.Valid;

					log.InfoFormat("Msrmnt OK: time = {0}, temp={1}, humi={2}, pres={3}", msrmntTimeStamp, t, h, p);
				}
				else
				{
					log.Warn("Invalid string received: " + measurement);
				}
			}
        }

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

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

		///
		/// 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()
		{
		}
	}
}