///
/// Copyright (c) 2021 Sensus Slovensko a.s.
///
using System;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using log4net;
using Common;
using DataStreamInterface;

namespace TBF.Rig.RegisterReaders.DataStream.MefImport
{
	/// <summary>
	/// MEF interface to an external data stream reader component.
	/// </summary>
	public class MefImport : ComponentBase
	{
        private static readonly ILog log = LogManager.GetLogger(typeof(MefImport));
        public override string ToString() { return string.Format("{0}({1})", ClassName, Cfg.ToString(-1)); }

        public Int64 MinSamplesCount { get { return 10; } }


        [Import(typeof(IDataStreamMeter))]
        public IDataStreamMeter DataStreamIFace;


        readonly MefImportCfg myCfg;
		public string CatalogDir { get { return myCfg.CatalogDir; } }


        /// <summary>
        /// Size of this array is DataStreamIFace.GetMetersCount()
        /// 'true' in this array represents an open connection to the water meter with the same index
        /// </summary>
        bool[] isConnectedArray;


		public MefImport() { }

		public MefImport(Generic.IComponentCfg cfg)
			: base(cfg)
		{
			myCfg = cfg as MefImportCfg;
        }

        public override void Initialize()
        {
            if (DebugLevel == DebugMode.Normal)
            {
                var catalog = new AggregateCatalog();
                catalog.Catalogs.Add(new AssemblyCatalog(typeof(DataStreamInterface.IDataStreamMeter).Assembly));
                catalog.Catalogs.Add(new DirectoryCatalog(CatalogDir));
                (new CompositionContainer(catalog)).ComposeParts(this);

                isConnectedArray = new bool[DataStreamIFace.GetMetersCount()];

                log.FatalFormat("{0} initialized: {1}", Name, this);
                log.FatalFormat("   Meters count = {0}", DataStreamIFace.GetMetersCount());
                log.FatalFormat("   Time unit = {0}", DataStreamIFace.GetTimeUnits().ToString());
                log.FatalFormat("   Volume unit = {0}", DataStreamIFace.GetVolumeUnits().ToString());
                for (int i = 0; i < DataStreamIFace.GetQuantitiesCount(); i++)
                {
                    log.FatalFormat("   Quantity_{0} = {1}, unit = {2}", i + 1,
                                    DataStreamIFace.GetQuantityCaption(i),
                                    DataStreamIFace.GetQuantityUnits(i).ToString());
                }
            }
            else
            {
                log.FatalFormat("{0} simulated: {1}", Name, this);
            }
        }


        public bool IsConnected(int ix)
        {
            return (isConnectedArray != null && ix >= 0 && ix < isConnectedArray.Length) ? isConnectedArray[ix] : false;
        }

        /// <summary>
        /// Wrapper for DataStreamIFace.OpenConnection() that updates bool[] isConnected array.
        /// </summary>
        /// <param name="ix">0-based water meter index</param>
        /// <param name="connectionParameters">Connection parameters</param>
        /// <param name="meterId">Water meter ID (serial number)</param>
        /// <returns>true = Successfully connected</returns>
        public bool OpenConnection(int ix, string connectionParameters, out string meterId)
        {
            if (isConnectedArray != null && ix >= 0 && ix < isConnectedArray.Length)
            {
                isConnectedArray[ix] = DataStreamIFace.OpenConnection(ix, connectionParameters, out meterId);
                return isConnectedArray[ix];
            }
            else
            {
                meterId = string.Empty;
                return false;
            }
        }

        /// <summary>
        /// Wrapper for DataStreamIFace.CloseConnection() called in a loop for all connected water meters
        /// </summary>
        public bool CloseConnectionAll()
        {
            if (isConnectedArray != null)
            {
                for (int ix = 0; ix < isConnectedArray.Length; ix++)
                {
                    if (isConnectedArray[ix])
                    {
                        DataStreamIFace.CloseConnection(ix);
                        isConnectedArray[ix] = false;       /// reset IsConnected flag regardless of returned value
                    }
                }
            }

            return true;
        }

        /// <summary>
        /// Wrapper for DataStreamIFace.StartMeasurement(), starts only connected water meters
        /// </summary>
        public bool StartMeasurement(int ix)
        {
            if (isConnectedArray != null && ix >= 0 && ix < isConnectedArray.Length && isConnectedArray[ix])
            {
                return DataStreamIFace.StartMeasurement(ix);
            }

            return false;
        }

        /// <summary>
        /// Wrapper that bypasses DataStreamIFace.StartMeasurementAll(), starts only connected water meters
        /// </summary>
        public bool StartMeasurementAll()
        {
            if (isConnectedArray != null)
            {
                for (int ix = 0; ix < isConnectedArray.Length; ix++)
                {
                    if (isConnectedArray[ix]) DataStreamIFace.StartMeasurement(ix);
                }
                return true;
            }

            return false;
        }

        /// <summary>
        /// Wrapper for DataStreamIFace.StopMeasurement(), stops only connected water meters
        /// </summary>
        public bool StopMeasurement(int ix, out Int64 storedFramesCount)
        {
            if (isConnectedArray != null && ix >= 0 && ix < isConnectedArray.Length && isConnectedArray[ix])
            {
                return DataStreamIFace.StopMeasurement(ix, out storedFramesCount);
            }

            storedFramesCount = 0;
            return false;
        }

        /// <summary>
        /// Wrapper that bypasses DataStreamIFace.StopMeasurementAll(), stops only connected water meters
        /// </summary>
        public bool StopMeasurementAll(out Int64[] storedFramesCounts)
        {
            if (isConnectedArray != null)
            {
                storedFramesCounts = new Int64[isConnectedArray.Length];
                for (int ix = 0; ix < isConnectedArray.Length; ix++)
                {
                    if (isConnectedArray[ix])
                        DataStreamIFace.StopMeasurement(ix, out storedFramesCounts[ix]);
                    else
                        storedFramesCounts[ix] = 0;
                }
                return true;
            }

            storedFramesCounts = null;
            return false;
        }
    }
}