///
/// Copyright (c) 2021 Sensus Slovensko a.s.
///
using System;
using System.Reflection;
using System.Text;
using System.Windows.Forms;
using Common;
using log4net;
using TBF.Rig.GenericDevices;

namespace TBF.Rig.ControlBoard.Uni
{
    public class StandingStartStopTestOp : IOperation
	{
		private static readonly ILog log = LogManager.GetLogger(typeof(StandingStartStopTestOp));
        public override string ToString() { return string.Format("StandingStartStopTestOp()"); }

        ///
        /// Set by the constructor
        ///
        readonly UniCB uniCB;
        readonly object flowMeter;
        readonly TBF.Rig.Uni.FlowMetersInParallel.FlowMeter flowMeterInParallel;
        readonly TBF.Rig.Uni.Diverter.Diverter diverter;
		readonly int pulsesCount;               /// Number of reference pulses for a complete test
        readonly bool withDiverter;             /// Test with diverter (and scale)
                                                
        private DateTime startTimeForSimulation;
        private bool simulationTimerStarted = false;

        ///
        ///  Internal state of this operation
        ///
        enum OpState
        {
            StartingTest,
            TestInProgress,
            TestCompleted,
        }

        OpState opState;

        /// <summary>
        /// Operation for a Standing start-stop test (constructor)
        /// 
        /// Events: OpArgumentError .... invalid arguments, test cannot be started
        ///         StartingTest ....... starting a test
        ///         TestInProgress ..... test was successfully started, test is running
        ///         TestCompleted ...... test was successfully completed
        ///         Error .............. unspecified error while running a test
        /// </summary>
        /// <param name="cb">Control board component</param>
        /// <param name="devices">Components used by the test</param>
        /// <param name="qFrom">Flow lower limit</param>
        /// <param name="qTo">Flow upper limit</param>
        /// <param name="pulsesCount">Test duration - number of reference flow meter pulses</param>
        public StandingStartStopTestOp(UniCB cb, OutputPath devices, int pulsesCount, bool withDiverter)
        {
            this.uniCB = cb;
            try
            {
                flowMeter = devices.FlowMeter as TBF.Rig.Uni.FlowMeter.FlowMeter;
                if(flowMeter == null) flowMeter = devices.FlowMeter as TBF.Rig.Uni.FlowMetersInParallel.FlowMeter;

                if (flowMeter == null) throw new ArgumentNullException("Invalid flow meter");
            }
            catch (Exception ex)
            {
                string deviceInfo = GetAllDevicesInfo(devices);
                string flowMeterStatus = devices.FlowMeter == null
                ? "devices.FlowMeter je NULL"
                : $"devices.FlowMeter je typu: {devices.FlowMeter.GetType().FullName}";

                MessageBox.Show(
                    $"Chyba počas zastavenia regulácie prietoku, v ramci StandingStartStopTestOp() pre flowMeter:\n" +
                    $"{ex.Message}\n\n" +
                    $"Diagnostika:\n{flowMeterStatus}\n\n" +
                    $"{deviceInfo}\n\n" +
                    $"Stack trace:\n{ex.StackTrace}",
                    "Chyba",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error
                );

                throw;
            }

            this.pulsesCount = pulsesCount;
            this.withDiverter = withDiverter;

            if (withDiverter)
            {
                try
                {
                    diverter = devices.Diverter as TBF.Rig.Uni.Diverter.Diverter;
                    if (diverter == null) throw new ArgumentNullException("Invalid diverter");
                }
                catch (Exception ex)
                {
                    string deviceInfo = GetAllDevicesInfo(devices);

                    MessageBox.Show(
                        $"Chyba počas zastavenia regulácie prietoku, v ramci StandingStartStopTestOp() pre diverter:\n" +
                        $"{ex.Message}\n\n{deviceInfo}\n\nStack trace:\n{ex.StackTrace}",
                        "Chyba",
                        MessageBoxButtons.OK,
                        MessageBoxIcon.Error
                    );

                    throw;
                }
            }

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

        string GetAllDevicesInfo(object obj)
        {
            if (obj == null) return "devices objekt je null.";

            StringBuilder sb = new StringBuilder();
            sb.AppendLine("Zoznam zariadení v devices:");

            var props = obj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (var prop in props)
            {
                try
                {
                    object value = prop.GetValue(obj);
                    string valueStr = value != null ? value.ToString() : "null";
                    sb.AppendLine($"{prop.Name}: {valueStr}");
                }
                catch (Exception ex)
                {
                    sb.AppendLine($"{prop.Name}: [Chyba pri načítaní - {ex.Message}]");
                }
            }

            return sb.ToString();
        }

        /// <summary>
        /// Start this operation
        /// </summary>
        public void Start()
        {
            if (flowMeter is TBF.Rig.Uni.FlowMeter.FlowMeter)
            {
                log.InfoFormat("Start() Et#={0} pulses={1} withDiverter={2}", ((TBF.Rig.Uni.FlowMeter.FlowMeter)flowMeter).Idx1, pulsesCount, withDiverter);

                /// Start the test (and the flow measurement)
                if (withDiverter) { uniCB.DivResolution = diverter.Resolution; }
                uniCB.SetActivity(Activity.StandingStartStopTest);
                uniCB.StartTest(false, ((TBF.Rig.Uni.FlowMeter.FlowMeter)flowMeter).Idx1, (withDiverter ? diverter.DiverterNr : 0), 0,
                                false, withDiverter, false, true, false, pulsesCount);

                opState = OpState.StartingTest;
            }
            else if (flowMeter is TBF.Rig.Uni.FlowMetersInParallel.FlowMeter)
            {
                log.InfoFormat("Start() Et#={0} pulses={1} withDiverter={2}", ((TBF.Rig.Uni.FlowMetersInParallel.FlowMeter)flowMeter).Idx1, pulsesCount, withDiverter);

                /// Start the test (and the flow measurement)
                if (withDiverter) { uniCB.DivResolution = diverter.Resolution; }
                uniCB.SetActivity(Activity.StandingStartStopTest);
                uniCB.StartTest(false, ((TBF.Rig.Uni.FlowMetersInParallel.FlowMeter)flowMeter).Idx1, (withDiverter ? diverter.DiverterNr : 0), 0,
                                false, withDiverter, false, true, false, pulsesCount);

                opState = OpState.StartingTest;
            }

           
        }

        /// <summary>
        /// Run this operation
        /// </summary>
        /// <returns>
        ///   Event.OpArgumentError .... invalid arguments, test cannot be started
        ///   Event.StartingTest ....... starting a test
        ///   Event.TestInProgress ..... test was successfully started, test is running
        ///   Event.TestCompleted ...... test was successfully completed
        ///   Event.Error .............. unspecified error while running a test
        /// </returns>
        public Event Run()
		{
            log.DebugFormat("Run() opState={0}", opState);

            //Simulation of processing time 25 seconds
            if (uniCB.DebugLevel == DebugMode.Simulate)
            {
                if (opState == OpState.StartingTest)
                {
                    startTimeForSimulation = DateTime.Now;
                    simulationTimerStarted = false;
                }
                if (opState == OpState.TestInProgress)
                {
                    if (!simulationTimerStarted)
                    {
                        startTimeForSimulation = DateTime.Now;
                        simulationTimerStarted = true;
                    }
                    else if (DateTime.Now - startTimeForSimulation > TimeSpan.FromSeconds(25))
                    {
                        return Event.TestCompleted;
                    }
                }
            }
            
            switch (opState)
            {
                case OpState.StartingTest:

                    opState = OpState.TestInProgress;
                    return Event.TestInProgress;

                case OpState.TestInProgress:

                    if (uniCB.RefPulses < pulsesCount)
                    {
                        return Event.TestInProgress;    /// Test was not completed yet
                    }
                    opState = OpState.TestCompleted;
                    return Event.TestCompleted;

                case OpState.TestCompleted:
                default:
                    return Event.TestCompleted;
            }
        }

		/// <summary>
        /// Stop this operation
        /// </summary>
		public void Stop()
        {
            log.Info("Stop()");
            uniCB.SetActivity((opState == OpState.TestCompleted) ? Activity.TestCompleted : Activity.Idle);
            uniCB.StopAll(false);
        }
	}
}