///
/// Copyright (c) 2017 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using log4net;
using Config.Entities;

namespace TBF.BenchControl.Network.Camera.Roi
{
	public class Roi : ComponentBase, GenericDevices.IRoi, IOperation
	{
		/// TODO: Implement support for sharing one camera by multiple ROI-s

		private static readonly ILog log = LogManager.GetLogger(typeof(Roi));
		public override string ToString()
		{
			return string.Format("{0}({1})", this.GetType().Namespace.Substring(17), Cfg.ToString(1));
		}

		///
		/// Cfg 
		///
		public readonly RoiCfg RoiCfg;

		public readonly CLP1611.Camera NetCamera;
		public readonly Roi PreviousRoi;

		///
		/// ICamera interface functions 
		///
		public GenericDevices.ICamera Camera { get { return NetCamera as GenericDevices.ICamera; } }

		public double PulsesPerLtr { get { return (double)RoiCfg.ProcParams.PulsesPerLtr; } }
		public double LtrsPerPulse { get { return (PulsesPerLtr <= float.Epsilon) ? 1.0 : (1 / PulsesPerLtr); } }

		int cameraPulses;
		int pulsesDelta;		/// = (WMPulses - cameraPulses) ... WMPulses = cameraPulses + pulsesDelta, Clear() calculates pulsesDelta
		public int WMPulses { get { return cameraPulses + pulsesDelta; } }

		long cameraTime;
		long timeDelta;			/// = (WMTestTime - cameraTime) ... WMTestTime = cameraTime + timeDelta, Clear() calculates timeDelta
		public double WMTestTime { get { return (cameraTime + timeDelta) / 1000.0; } }

		int wmRefPulses;
		public int WMRefPulses { get { return wmRefPulses; } }

		public double WMVolume { get { return LtrsPerPulse * (double)WMPulses; } }

		public double BeginWMState { get { return 0; } }				/// Always 0
		public double EndWMState { get { return WMVolume; } }			/// Derived from WMVolume


		double volumeStart;
		public double VolumeStart { get { return volumeStart; } }		/// in l

		double volumeEnd;
		public double VolumeEnd { get { return volumeEnd; } }			/// in l

		double timestampStart;
		public double TimestampStart { get { return timestampStart; } }	/// in s

		double timestampEnd;
		public double TimestampEnd { get { return timestampEnd; } }		/// in s

		///
		/// Roi specific
		///
		public bool Detected { get { return detected; } }
		bool detected;
		/// 
		public Boxes.IntBox RoiX;
		public Boxes.IntBox RoiY;
		public Boxes.IntBox RoiWid;
		public Boxes.IntBox RoiHgh;
		/// 
		public void ClearRoi()
		{
			detected = false;
		}
		/// 
		public void SetRoi(int x, int y, int wid, int hgh)
		{
			RoiX.Val = x;
			RoiY.Val = y;
			RoiWid.Val = wid;
			RoiHgh.Val = hgh;
			detected = true;
		}
		/// 
		public string DetectedImageName { get { return detectedImageName; } }
		string detectedImageName;
		/// 
		private int roiHandle;
		/// 
		public void RegisterRoiToCamera()
		{
			roiHandle = Camera.RegisterRoi(string.Format("-roi 1 {0} {1} {2} bkgnd.bmp", RoiX.Val, RoiY.Val, RoiCfg.RoiParams));
		}



		public Roi()
		{
		}

		public Roi(Generic.IComponentCfg cfg, IList<Generic.IComponent> components)
            : base(cfg)
        {
			RoiCfg = cfg as RoiCfg;
			NetCamera = TbfComponents.FindComponent(cfg.ParentName, components) as CLP1611.Camera;

			PreviousRoi = TbfComponents.FindComponent(RoiCfg.PreviousRoi, components) as Roi;

			detected = false;
			RoiX = new Boxes.IntBox();
			RoiY = new Boxes.IntBox();
            RoiWid = new Boxes.IntBox();
            RoiHgh = new Boxes.IntBox();

			Clear();

			StartChangeHandler();

			log.Debug(this.ToString());
		}


        #region Configuration Change Handling

        public static void OnCfgChange(object sender, CfgChangeArgs args)
        {
            if (CfgChangeHandler == null) return;
            try { CfgChangeHandler(sender, args); }
            catch (Exception e) { log.Error("CfgChangeHandler(...) failed", e); }
        }

        public static event EventHandler<CfgChangeArgs> CfgChangeHandler;

        public override void StartChangeHandler()
        {
            CfgChangeHandler += delegate(object sender, CfgChangeArgs args)
            {
                RoiCfg tmpcfg = args.Cfg as RoiCfg;
                if (tmpcfg != null && tmpcfg.Name.Equals(Name))
                {
                    if (args.Command == CfgChangeCmd.CfgChange)
                    {
						RoiCfg.LoadImages = tmpcfg.LoadImages;
						RoiCfg.SaveImages = tmpcfg.SaveImages;
					}
                }
            };
        }

        #endregion Configuration Change Handling

		public void Clear()
		{
			pulsesDelta = -cameraPulses;
			timeDelta = -cameraTime;
			wmRefPulses = 0;
		}

		public void TestCompleted() { }


		public IOperation RoiDetectionOp()
		{
            if (NetCamera != null && NetCamera.Telnet != null)
			{
				detectedImageName = Path.Combine(Program.TempImagesDir, string.Format("{0}-det-{1}.jpg", RoiCfg.Name, StateMachine.Time));
				return new RoiDetectionOp(this, NetCamera, detectedImageName, RoiX, RoiY, RoiWid, RoiHgh);
			}
			else
				return null;
		}


		public IOperation GrabImageOp(string imageFileName, bool blackAndWhite, bool lowResolution, ImageRotation imageRotation)
		{
			if (NetCamera != null && NetCamera.Telnet != null)
			{
				/// TODO: Implement support for sharing one camera by multiple ROI-s
				return NetCamera.GrabImagesOp(new string[] { imageFileName }, blackAndWhite, lowResolution, imageRotation);
			}
			else
				return null;
		}


		public IOperation GrabImageOp(string imageFileName)
		{
			if (NetCamera != null && NetCamera.Telnet != null)
			{
				/// TODO: Implement support for sharing one camera by multiple ROI-s
				return NetCamera.GrabImagesOp(new string[] { imageFileName }, false, true, ImageRotation.None);
			}
			else
				return null;
		}


		/// <summary>
		/// Updates wmPulses, caled from 'Start' and 'Run' functions of 'ReadRegisterOp'
		/// </summary>
		void UdatePulses()
		{
			if (detected && roiHandle != 0)
			{
				cameraPulses = NetCamera.GetResult(roiHandle, out cameraTime);
			}
		}
	
		///
		/// Note: Measurement operations of cameras should preceeede ReadRegister operations of ROI-s
		///
		public IOperation ReadRegisterOp()
		{
			return this;
		}

		/// <summary>Start this operation</summary>
		public void Start()
		{
			UdatePulses();
			Clear();
			volumeStart = WMVolume;
			timestampStart = WMTestTime;
		}

		/// <summary>Run this operation</summary>
		/// <returns>eventDone</returns>
		public Event Run()
		{
			UdatePulses();
			volumeEnd = WMVolume;
			timestampEnd = WMTestTime;
			return Event.ReadRegisterDone;
		}

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