//******************************************************************************************************
//  ConfigurationCell.cs - Gbtc
//
//  Copyright © 2012, Grid Protection Alliance.  All Rights Reserved.
//
//  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
//  the NOTICE file distributed with this work for additional information regarding copyright ownership.
//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may
//  not use this file except in compliance with the License. You may obtain a copy of the License at:
//
//      http://www.opensource.org/licenses/MIT
//
//  Unless agreed to in writing, the subject software distributed under the License is distributed on an
//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
//  License for the specific language governing permissions and limitations.
//
//  Code Modification History:
//  ----------------------------------------------------------------------------------------------------
//  05/05/2009 - J. Ritchie Carroll
//       Generated original version of source code.
//  05/19/2011 - J. Ritchie Carroll
//       Removed generic dictionary from serialization since these can't be SOAP serialized.
//  12/17/2012 - Starlynn Danyelle Gilliam
//       Modified Header.
//
//******************************************************************************************************

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using GSF.TimeSeries;
using GSF.Units.EE;

namespace GSF.PhasorProtocols.Anonymous
{
    /// <summary>
    /// Represents a protocol independent implementation of a <see cref="IConfigurationCell"/> that can be sent or received.
    /// </summary>
    [Serializable]
    public class ConfigurationCell : ConfigurationCellBase, IDevice
    {
        #region [ Members ]

        // Fields
        private DataFormat m_analogDataFormat;
        private DataFormat m_frequencyDataFormat;
        private DataFormat m_phasorDataFormat;
        private CoordinateFormat m_phasorCoordinateFormat;

        // Add cached signal type and statistical tracking information to our protocol independent configuration cell
        private readonly string[][] m_generatedSignalReferenceCache;
        private readonly MeasurementKey[][] m_generatedMeasurementKeyCache;
        
        // Keep track of the object that was last used to lookup the MeasurementMetadata. If objects changes, cache must be recomputed.
        private Dictionary<string, MeasurementKey> m_keyLookupObject;
        private Ticks m_lastReportTime;
        private long m_totalFrames;
        private long m_dataQualityErrors;
        private long m_timeQualityErrors;
        private long m_deviceErrors;
        private long m_measurementsReceived;
        private long m_measurementsExpected;
        private long m_measurementsWithError;
        private long m_measurementsDefined;
        private object m_source;

        #endregion

        #region [ Constructors ]

        /// <summary>
        /// Creates a new <see cref="ConfigurationCell"/> from specified parameters.
        /// </summary>
        /// <param name="idCode">The numeric ID code for this <see cref="ConfigurationCell"/>.</param>
        public ConfigurationCell(ushort idCode)
            : this(null, idCode)
        {
        }

        /// <summary>
        /// Creates a new <see cref="ConfigurationCell"/> from specified parameters.
        /// </summary>
        /// <param name="parent">The reference to parent <see cref="ConfigurationFrame"/> of this <see cref="ConfigurationCell"/>.</param>
        /// <param name="idCode">The numeric ID code for this <see cref="ConfigurationCell"/>.</param>
        public ConfigurationCell(ConfigurationFrame parent, ushort idCode)
            : base(parent, idCode, int.MaxValue, int.MaxValue, int.MaxValue)
        {
            // Create a cached signal reference dictionary for generated signal references
            m_generatedSignalReferenceCache = new string[Enum.GetValues(typeof(SignalKind)).Length][];
            m_generatedMeasurementKeyCache = new MeasurementKey[Enum.GetValues(typeof(SignalKind)).Length][];

            m_analogDataFormat = DataFormat.FloatingPoint;
            m_frequencyDataFormat = DataFormat.FloatingPoint;
            m_phasorDataFormat = DataFormat.FloatingPoint;
            m_phasorCoordinateFormat = CoordinateFormat.Polar;
        }

        /// <summary>
        /// Creates a new <see cref="ConfigurationCell"/> from serialization parameters.
        /// </summary>
        /// <param name="info">The <see cref="SerializationInfo"/> with populated with data.</param>
        /// <param name="context">The source <see cref="StreamingContext"/> for this deserialization.</param>
        protected ConfigurationCell(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
            // Create a cached signal reference dictionary for generated signal references
            m_generatedSignalReferenceCache = new string[Enum.GetValues(typeof(SignalKind)).Length][];
            m_generatedMeasurementKeyCache = new MeasurementKey[Enum.GetValues(typeof(SignalKind)).Length][];

            // Deserialize configuration cell
            m_lastReportTime = info.GetInt64("lastReportTime");
            m_analogDataFormat = (DataFormat)info.GetValue("analogDataFormat", typeof(DataFormat));
            m_frequencyDataFormat = (DataFormat)info.GetValue("frequencyDataFormat", typeof(DataFormat));
            m_phasorDataFormat = (DataFormat)info.GetValue("phasorDataFormat", typeof(DataFormat));
            m_phasorCoordinateFormat = (CoordinateFormat)info.GetValue("phasorCoordinateFormat", typeof(CoordinateFormat));
        }

        #endregion

        #region [ Properties ]

        /// <summary>
        /// Gets or sets the <see cref="DataFormat"/> for the <see cref="IAnalogDefinition"/> objects in the <see cref="ConfigurationCellBase.AnalogDefinitions"/> of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public override DataFormat AnalogDataFormat
        {
            get => m_analogDataFormat;
            set => m_analogDataFormat = value;
        }

        /// <summary>
        /// Gets or sets the <see cref="DataFormat"/> of the <see cref="FrequencyDefinition"/> of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public override DataFormat FrequencyDataFormat
        {
            get => m_frequencyDataFormat;
            set => m_frequencyDataFormat = value;
        }

        /// <summary>
        /// Gets or sets the <see cref="DataFormat"/> for the <see cref="IPhasorDefinition"/> objects in the <see cref="ConfigurationCellBase.PhasorDefinitions"/> of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public override DataFormat PhasorDataFormat
        {
            get => m_phasorDataFormat;
            set => m_phasorDataFormat = value;
        }

        /// <summary>
        /// Gets or sets the <see cref="CoordinateFormat"/> for the <see cref="IPhasorDefinition"/> objects in the <see cref="ConfigurationCellBase.PhasorDefinitions"/> of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public override CoordinateFormat PhasorCoordinateFormat
        {
            get => m_phasorCoordinateFormat;
            set => m_phasorCoordinateFormat = value;
        }

        /// <summary>
        /// Gets or sets last report time of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public Ticks LastReportTime
        {
            get => m_lastReportTime;
            set => m_lastReportTime = value;
        }

        /// <summary>
        /// Gets or sets total frames of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long TotalFrames
        {
            get => m_totalFrames;
            set => m_totalFrames = value;
        }

        /// <summary>
        /// Gets or sets total data quality errors of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long DataQualityErrors
        {
            get => m_dataQualityErrors;
            set => m_dataQualityErrors = value;
        }

        /// <summary>
        /// Gets or sets total time quality errors of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long TimeQualityErrors
        {
            get => m_timeQualityErrors;
            set => m_timeQualityErrors = value;
        }

        /// <summary>
        /// Gets or sets total device errors of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long DeviceErrors
        {
            get => m_deviceErrors;
            set => m_deviceErrors = value;
        }

        /// <summary>
        /// Gets or sets total measurements received for this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long MeasurementsReceived
        {
            get => m_measurementsReceived;
            set => m_measurementsReceived = value;
        }

        /// <summary>
        /// Gets or sets total measurements expected to have been received for this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long MeasurementsExpected
        {
            get => m_measurementsExpected;
            set => m_measurementsExpected = value;
        }

        /// <summary>
        /// Gets or sets the number of measurements received while this <see cref="IDevice"/> was reporting errors.
        /// </summary>
        public long MeasurementsWithError
        {
            get => m_measurementsWithError;
            set => m_measurementsWithError = value;
        }

        /// <summary>
        /// Gets or sets the number of measurements (per frame) defined for this <see cref="ConfigurationCell"/>.
        /// </summary>
        public long MeasurementsDefined
        {
            get => m_measurementsDefined;
            set => m_measurementsDefined = value;
        }

        /// <summary>
        /// Gets or sets the reference to the source of this <see cref="ConfigurationCell"/>.
        /// </summary>
        public object Source
        {
            get => m_source;
            set => m_source = value;
        }

        /// <summary>
        /// Gets the maximum length of the <see cref="ConfigurationCellBase.StationName"/> of this <see cref="ConfigurationCell"/>.
        /// </summary>
        /// <remarks>
        /// This length is not restricted for anonymous protocol definitions.
        /// </remarks>
        public override int MaximumStationNameLength => int.MaxValue;

        #endregion

        #region [ Methods ]

        /// <summary>
        /// Get signal reference for specified <see cref="SignalKind"/>.
        /// </summary>
        /// <param name="type"><see cref="SignalKind"/> to request signal reference for.</param>
        /// <returns>Signal reference of given <see cref="SignalKind"/>.</returns>
        public string GetSignalReference(SignalKind type)
        {
            // We cache non-indexed signal reference strings so they don't need to be generated at each mapping call.
            // This helps with performance since the mappings for each signal occur 30 times per second.
            int typeIndex = (int)type;

            // Look up synonym in dictionary based on signal type, if found return single element
            string[] references = m_generatedSignalReferenceCache[typeIndex];

            if (references is not null)
                return references[0];

            // Create a new signal reference array (for single element)
            references = new string[1];

            // Create and cache new non-indexed signal reference
            references[0] = SignalReference.ToString(IDLabel, type);

            // Cache generated signal synonym
            m_generatedSignalReferenceCache[typeIndex] = references;

            return references[0];
        }

        /// <summary>
        /// Get signal reference for specified <see cref="SignalKind"/> and <paramref name="index"/>.
        /// </summary>
        /// <param name="type"><see cref="SignalKind"/> to request signal reference for.</param>
        /// <param name="index">Index <see cref="SignalKind"/> to request signal reference for.</param>
        /// <param name="count">Number of signals defined for this <see cref="SignalKind"/>.</param>
        /// <returns>Signal reference of given <see cref="SignalKind"/> and <paramref name="index"/>.</returns>
        public string GetSignalReference(SignalKind type, int index, int count)
        {
            // We cache indexed signal reference strings so they don't need to be generated at each mapping call.
            // This helps with performance since the mappings for each signal occur 30 times per second.
            // For speed purposes we intentionally do not validate that signalIndex falls within signalCount, be
            // sure calling procedures are very careful with parameters...
            int typeIndex = (int)type;

            // Look up synonym in dictionary based on signal type
            string[] references = m_generatedSignalReferenceCache[typeIndex];

            if (references is not null)
            {
                // Verify signal count has not changed (we may have received new configuration from device)
                if (count == references.Length)
                {
                    // Create and cache new signal reference if it doesn't exist
                    return references[index] ?? (references[index] = SignalReference.ToString(IDLabel, type, index + 1));
                }
            }

            // Create a new indexed signal reference array
            references = new string[count];

            // Create and cache new signal reference
            references[index] = SignalReference.ToString(IDLabel, type, index + 1);

            // Cache generated signal synonym array
            m_generatedSignalReferenceCache[typeIndex] = references;

            return references[index];
        }

        /// <summary>
        /// Get <see cref="MeasurementMetadata"/> for specified <see cref="SignalKind"/>.
        /// </summary>
        /// <param name="lookup">A lookup table by signal reference.</param>
        /// <param name="type"><see cref="SignalKind"/> to request signal reference for.</param>
        /// <returns>The <see cref="MeasurementMetadata"/> for a given <see cref="SignalKind"/>; otherwise <c>null</c> if value does not exist.</returns>
        public MeasurementMetadata GetMetadata(Dictionary<string, MeasurementKey> lookup, SignalKind type)
        {
            // Clear the cache if the lookup dictionary has changed.
            // Since the instance of Lookup is effectively readonly as implemented in PhasorMeasurementMapper
            // a simple reference check is all that is needed. If it could be modified, this would likely be a
            // concurrent dictionary instead.
            if (m_keyLookupObject != lookup)
            {
                Array.Clear(m_generatedMeasurementKeyCache, 0, m_generatedMeasurementKeyCache.Length);
                m_keyLookupObject = lookup;
            }

            // Gets the cache for the supplied SignalKind
            int typeIndex = (int)type;
            MeasurementKey[] keyArray = m_generatedMeasurementKeyCache[typeIndex];

            // If this SignalKind is null, create the sub array and generate all item lookups
            if (keyArray is null)
            {
                keyArray = new MeasurementKey[1];
                m_generatedMeasurementKeyCache[typeIndex] = keyArray;

                string signalReference = GetSignalReference(type);

                if (lookup.TryGetValue(signalReference, out MeasurementKey key))
                    keyArray[0] = key;
            }

            return keyArray[0]?.Metadata;
        }

        /// <summary>
        /// Get <see cref="MeasurementMetadata"/> for specified <see cref="SignalKind"/>.
        /// </summary>
        /// <param name="lookup">A lookup table by signal reference.</param>
        /// <param name="type"><see cref="SignalKind"/> to request signal reference for.</param>
        /// <param name="index">Index <see cref="SignalKind"/> to request signal reference for.</param>
        /// <param name="count">Number of signals defined for this <see cref="SignalKind"/>.</param>
        /// <returns>The MeasurementMetadata for a given <see cref="SignalKind"/>. Null if it does not exist.</returns>
        public MeasurementMetadata GetMetadata(Dictionary<string, MeasurementKey> lookup, SignalKind type, int index, int count)
        {
            // Clear the cache if the lookup dictionary has changed.
            // Since the instance of Lookup is effectively readonly as implemented in PhasorMeasurementMapper
            // a simple reference check is all that is needed. If it could be modified, this would likely be a
            // concurrent dictionary instead.
            if (m_keyLookupObject != lookup)
            {
                Array.Clear(m_generatedMeasurementKeyCache, 0, m_generatedMeasurementKeyCache.Length);
                m_keyLookupObject = lookup;
            }

            // Gets the cache for the supplied SignalKind
            int typeIndex = (int)type;
            MeasurementKey[] keyArray = m_generatedMeasurementKeyCache[typeIndex];

            // If this SignalKind is null, create the sub array and generate all item lookups, also, rebuild
            // if the count is not the same. This could be because a new config frame was received.
            if (keyArray is null || keyArray.Length != count)
            {
                keyArray = new MeasurementKey[count];
                m_generatedMeasurementKeyCache[typeIndex] = keyArray;

                for (int x = 0; x < count; x++)
                {
                    string signalReference = GetSignalReference(type, x, count);

                    if (lookup.TryGetValue(signalReference, out MeasurementKey key))
                        keyArray[x] = key;
                    else
                        keyArray[x] = MeasurementKey.Undefined;
                }
            }

            return keyArray[index]?.Metadata;
        }

        /// <summary>
        /// Populates a <see cref="SerializationInfo"/> with the data needed to serialize the target object.
        /// </summary>
        /// <param name="info">The <see cref="SerializationInfo"/> to populate with data.</param>
        /// <param name="context">The destination <see cref="StreamingContext"/> for this serialization.</param>
        public override void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            base.GetObjectData(info, context);

            // Serialize configuration cell
            info.AddValue("lastReportTime", (long)m_lastReportTime);
            info.AddValue("analogDataFormat", m_analogDataFormat, typeof(DataFormat));
            info.AddValue("frequencyDataFormat", m_frequencyDataFormat, typeof(DataFormat));
            info.AddValue("phasorDataFormat", m_phasorDataFormat, typeof(DataFormat));
            info.AddValue("phasorCoordinateFormat", m_phasorCoordinateFormat, typeof(CoordinateFormat));
        }

        #endregion
    }
}