///
/// Copyright (c) 2017 Sensus Metering Systems
///
using System;
using log4net;
using TBF.BenchControl.Network.Telnet;

namespace TBF.BenchControl.Network.Camera.Roi
{
	public class RoiDetectionOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(RoiDetectionOp));
		public override string ToString() { return string.Format("RoiDetectionOp()"); }


		readonly Roi roi;
		readonly RoiCfg roiCfg; 
		readonly CLP1611.Camera camera;
		readonly Telnet.TelnetClient telnet;
		readonly string detectedImageName;

		string command;
		bool roiDetectionCommandSent;
		bool transferringDetectedImage;

		string response;
		bool passed;
		bool failed;
		bool previousFailed;

		Boxes.IntBox roiX;
		Boxes.IntBox roiY;
		Boxes.IntBox roiWid;
		Boxes.IntBox roiHgh;    /// Wid and Hgh are usefull when masking


		/// <summary>
		/// Events:  Event.None or Event.Error
		/// </summary>
		/// <param name="camera">CLP1611.Camera reference</param>
		public RoiDetectionOp(Roi roi, CLP1611.Camera camera, string detectedImageName,
							  Boxes.IntBox roiX, Boxes.IntBox roiY,
							  Boxes.IntBox roiWid, Boxes.IntBox roiHgh)
		{
			this.roi = roi;
			this.roiCfg = roi.RoiCfg;
			this.camera = camera;
			this.telnet = camera.Telnet;
			this.detectedImageName = detectedImageName;
			this.roiX   = roiX;
			this.roiY   = roiY;
			this.roiWid = roiWid;
			this.roiHgh = roiHgh;

			roiDetectionCommandSent = false;
			transferringDetectedImage = false;

			telnet.promptReceivedHandler += delegate(object sndr, PromptReceivedEventArgs a)
			{
				OnPromptReceived(sndr, a);
			};
		}

		void OnPromptReceived(object sndr, PromptReceivedEventArgs a)
		{
			response = a.Response;
		}

		public void Start()
		{
			roiDetectionCommandSent = false;
			transferringDetectedImage = false;
		}

		public Event Run()
		{
			if (!roiDetectionCommandSent)
			{
				if (telnet.State == TelnetClient.TelnetState.Inactive)
				{
					//
					// State variables
					//
					response = null;
					passed = false;
					failed = false;
					previousFailed = false;

					//
					// Prepare command
					//
					string masks = string.Empty;
					Roi previous = roi.PreviousRoi;
					int maskLevel = 0;
					while (previous != null && maskLevel++ < 3)
					{
						if (!previous.Detected)
						{
							previousFailed = true;
							return Event.RoiDetectionPreviousFailed;
						}

						masks += string.Format(" -m {0} {1} {2} {3}", previous.RoiX.Val, previous.RoiY.Val,
																	  previous.RoiWid.Val, previous.RoiHgh.Val);
						previous = previous.PreviousRoi;
					}
					command = string.Format("clp/RoiDetection{0}{1}{2}{3}{4} {5}",
											masks,
											string.Format(roiCfg.LoadImages ? " -l {0}" : " -n {0}", roiCfg.DetectionImagesCount),
											roiCfg.SaveImages ? " -s" : "",
											string.Format(" -p1 {0}", roiCfg.DetectionPeriod1),
											string.Format(" -p2 {0}", roiCfg.DetectionPeriod2),
											roiCfg.RoiParams);

					//
					// Send (or enqueue) command
					//
					telnet.Enqueue(new Telnet.Command(Telnet.CmdAction.CLEAR_RESPONSE));
					telnet.Enqueue(new Telnet.Command(Telnet.CmdAction.SEND_COMMAND, command));
					roiDetectionCommandSent = true;
				}
				return Event.CameraBusy;
			}
			else if (passed)
			{
				if (transferringDetectedImage)
				{
					/// ROI detection passed and image transfer is in progress
					return Event.RoiDetectionPassed;
				}
				else if (0 == camera.TransferFileViaScp("detected.jpg", detectedImageName))
				{
					/// File transfer successfully started
					transferringDetectedImage = true;
					return Event.RoiDetectionPassed;
				}
				else
				{
					/// Wait until the previous image transfer completes
					return Event.CameraBusy;
				}
			}
			else if (failed)
			{
				/// ROI detection failed, there in no image to transfer
				return Event.RoiDetectionFailed;
			}
			else if (previousFailed)
			{
				return Event.RoiDetectionPreviousFailed;
			}
			else if (response != null)
			{
				int from = response.IndexOf('[');
				int to = response.IndexOf(']');
				if (!response.Contains("RESULT=0\r\n") || from < 0 || to < 0 || to < from)
				{
					roi.ClearRoi();
					failed = true;
					return Event.RoiDetectionFailed;
				}
				else
				{
					string oroiStr = response.Substring(from + 1, to - from - 1);
					string[] terms = oroiStr.Split(new char[] { ',' });
					int x, y, w, h;
					if (terms.Length != 5 || !int.TryParse(terms[0], out x) || !int.TryParse(terms[1], out y)
										  || !int.TryParse(terms[2], out w) || !int.TryParse(terms[3], out h))
					{
						roi.ClearRoi();
						failed = true;
						return Event.RoiDetectionFailed;
					}
					else
					{
						roi.SetRoi(x, y, w, h);
						passed = true;

						///
						/// Start the file transfer
						///
						if (0 == camera.TransferFileViaScp("detected.jpg", detectedImageName))
						{
							/// File transfer successfully started
							transferringDetectedImage = true;
							return Event.RoiDetectionPassed;
						}
						else
						{
							return Event.CameraBusy;	/// File transfer not started yet
						}
					}
				}
			}
			else
			{
				return Event.CameraBusy;
			}
		}

		public void Stop()
		{
		}
	}
}