using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Threading;
using TBF.BenchControl;
using TBF.BenchControl.Generic;
using log4net;

namespace TBF.BenchControl.Cameras.IdcCamera
{
    /// <summary>
    /// IdcCamera object represents all IDC cameras.
    /// Camera ID is an argument of most methods.
    /// </summary>
	public class IdcCamera : ComponentBase, IDevice, IOperation, GenericDevices.ICamera
    {
		private static readonly ILog log = LogManager.GetLogger(typeof(IdcCamera));
		public override string ToString() { return string.Format("IdcCamera({0})", Cfg.ToString(1)); }

		readonly IdcCameraCfg idcCameraCfg;

		const int MaxRoisCount = 4;

        /// <summary>
        /// Enumeration of cameras via static fields and methods
        /// </summary>
        static int nextCameraNr = 0;
		public static new void ResetStaticProperties()
		{
			nextCameraNr = 0;
		}

		int cameraNr;
        public int CameraNr { get { return cameraNr; } }

        public float Brightness { get { return idcCameraCfg.BrightnessCam; } }

		/// <summary>
		/// Currently running camera operation.
		/// ReadRegisterOp-s are not included in this list, they are independent.
		/// </summary>
		public enum CurrentOp
		{
			None,
			StartNew,
            SetBrightness,
			Grab,
			Live,
			Focus,
			Detect,
			Measure,
		}

        /// Private fields
		public Idc100 Idc100;											/// Idc100 camera low level implementation
		CurrentOp currentOp;
		int currentRoiId;
		IWorkerCmd detectCmd;
		IWorkerCmd measureCmd;

		public IdcCamera(IdcCameraCfg cfg, IList<Generic.IComponent> components)
			: base(cfg)
        {
			idcCameraCfg = cfg;
			cameraNr = nextCameraNr++;
			log.Debug(this.ToString());
		}

		public void Initialize()
		{
			if (idcCameraCfg.DebugLevel == Entities.DebugMode.Simulate)
			{
				log.WarnFormat("{0}: in simulation mode", Name);
				return;
			}

			/// Initialize the camera
			Idc100 = new Idc100(Name, cameraNr, idcCameraCfg.ComPortNr, idcCameraCfg.BaudRate, idcCameraCfg.BrightnessCam);
			RetVal rVal = Idc100.StartOp(new Command.Connect(3000));        /// timeout in ms


			if (idcCameraCfg.DebugLevel == Entities.DebugMode.AutoDetect)
			{
				if (rVal == RetVal.OK)
					idcCameraCfg.DebugLevel = Entities.DebugMode.DetectedOn;
				else
					idcCameraCfg.DebugLevel = Entities.DebugMode.DetectedOff;
			}
			else if (rVal != RetVal.OK)
			{
				throw (new Exception(string.Format("Cannot make a connection to {0} on COM{1}", Name, idcCameraCfg.ComPortNr)));
			}

			if (idcCameraCfg.DebugLevel != Entities.DebugMode.DetectedOff)
			{
                log.FatalFormat("Successfully initialized device {0}", ToString());
            }
        }

		public void RunDeviceBefore()
        {
        }

        public void RunDeviceAfter()
        {
        }

        public void StopDevice()
        {
            if (Idc100 != null)
            {
                RetVal rVal = Idc100.StartOp(new Command.Disconnect());
                Idc100.ShutDown();
            }
        }

		/// <summary>
		/// Restart the camera with a new firmware.
		/// </summary>
		/// <returns>Reference to operation object instance</returns>
		public IOperation StartNewOp()
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			currentOp = CurrentOp.StartNew;
			return this;
		}

        /// <summary>
		/// Set camera image brightness (camera aperture).
		/// </summary>
		/// <returns>Reference to operation object instance</returns>
        public IOperation SetBrightnessOp()
        {
            if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
            currentOp = CurrentOp.SetBrightness;
            return this;
        }

		/// <summary>
		/// Grab an image.
		/// </summary>
		/// <returns>Reference to operation object instance</returns>
		public IOperation GrabOp()
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			currentOp = CurrentOp.Grab;
			return this;
		}

		/// <summary>
		/// Display live image.
		/// </summary>
		/// <returns>Reference to operation object instance</returns>
		public IOperation LiveOp()
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			currentOp = CurrentOp.Live;
			return this;
		}

		/// <summary>
		/// Display live detail to focus the camera.
		/// </summary>
		/// <returns>Reference to operation object instance</returns>
		public IOperation FocusOp()
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			currentOp = CurrentOp.Focus;
			return this;
		}

		/// <summary>
		/// Watermeter wheel/arrow detection process.
		/// </summary>
		/// <param name="roiId">Region of interest (1..MaxRoisCount)</param>
		/// <returns>Reference to operation object instance</returns>
		public IOperation DetectOp(int roiId, IWorkerCmd detectCmd)
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			if (roiId < 1 || roiId > MaxRoisCount) throw new ArgumentOutOfRangeException("roiId");
			currentOp = CurrentOp.Detect;
			this.currentRoiId = roiId;
			this.detectCmd = detectCmd;
			return this;
		}

		/// <summary>
		/// Watermeter wheel/arrow angle measurement process.
		/// </summary>
		/// <param name="roiId">Region of interest (1..MaxRoisCount)</param>
		/// <returns>Reference to operation object instance</returns>
		public IOperation MeasureOp(int roiId, IWorkerCmd measureCmd)
		{
			if (currentOp != CurrentOp.None) throw new Exception("Sequence error");
			if (roiId < 1 || roiId > MaxRoisCount) throw new ArgumentOutOfRangeException("roiId");
			currentOp = CurrentOp.Measure;
			this.currentRoiId = roiId;
			this.measureCmd = measureCmd;
			return this;
		}

		/// <summary>Start the operation</summary>
		public void Start()
		{
            if (Cfg.DebugLevel == Entities.DebugMode.Normal || Cfg.DebugLevel == Entities.DebugMode.DetectedOn)
			{
				switch (currentOp)
				{
					case CurrentOp.StartNew:
						Idc100.StartOp(new Command.StartNew());
						return;
					case CurrentOp.Grab:
                        Idc100.StartOp(new Command.Grab("snap1", FileFormat.Jpeg, Brightness, false));
						return;
					case CurrentOp.Live:
						Idc100.StartOp(new Command.Stream(StreamType.SubSampled, FileFormat.Jpeg, Brightness));
						return;
					case CurrentOp.Focus:
						Idc100.StartOp(new Command.Stream(StreamType.Focus, FileFormat.Bmp, Brightness));
						return;
					case CurrentOp.Detect:
						Idc100.StartOp(this.detectCmd);
						return;
					case CurrentOp.Measure:
						Idc100.StartOp(this.measureCmd);
						return;
				}
			}
		}

		/// <summary>
		/// Check the cameraDev state (OP_COMPLETED or OP_FAILED)
		/// </summary>
		/// <returns></returns>
		public Event Run()
		{
            if (Cfg.DebugLevel == Entities.DebugMode.Normal || Cfg.DebugLevel == Entities.DebugMode.DetectedOn)
			{
				switch (currentOp)
				{
					case CurrentOp.Grab:
						if (Idc100.IdcState == IdcState.Idle) return Event.None;
						else return Event.Error;

					case CurrentOp.StartNew:
					case CurrentOp.Live:
					case CurrentOp.Focus:
					case CurrentOp.Measure:
					case CurrentOp.Detect:
                        if (Idc100.IdcState == IdcState.Busy)
                        {
                            return Event.CameraBusy;
                        }
                        else if (Idc100.IdcState == IdcState.OpCompleted)
                        {
                            log.InfoFormat("{0}: {1} - OpCompleted", cameraNr, currentOp);
                            return Event.CameraOpCompleted;
                        }
                        else if (Idc100.IdcState == IdcState.OpFailed)
                        {
                            log.WarnFormat("{0}: {1} - OpFailed", cameraNr, currentOp);
                            return Event.CameraOpFailed;
                        }
                        else if (Idc100.IdcState == IdcState.DetectionFailed)
                        {
                            log.WarnFormat("{0}: {1} - DetectionFailed", cameraNr, currentOp);
                            return Event.DetectionFailed;
                        }
                        else return Event.Error;

					default:
						return Event.Error;
				}
			}
			else
			{
                if (currentOp == CurrentOp.Grab)
                {
                    return Event.None;
                }
                else
                {
                    return Event.CameraOpCompleted;
                }
			}
		}

		/// <summary>Stop the operation</summary>
		public void Stop()
		{
            if ((Cfg.DebugLevel == Entities.DebugMode.Normal || Cfg.DebugLevel == Entities.DebugMode.DetectedOn)
                  && (Idc100.IdcState != IdcState.Idle))
			{
				Idc100.StopOp();
			}
			currentOp = CurrentOp.None;
		}
	}
}