using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Text;
using System.Xml.Serialization;

namespace DTS.Common.Storage
{
    /// <summary>
    /// this class handles serializing and retrieving and holding sensor test history
    /// 3003 Attach Test History to Sensors
    /// </summary>
    [Serializable]
    public class SensorTestHistory
    {
        /// <summary>
        /// the id from the test history table for the test record
        /// </summary>
        public long TestHistoryId { get; set; }

        /// <summary>
        /// the id of the test setup from the test history table
        /// </summary>
        public int TestSetupId { get; set; } = -1;

        /// <summary>
        /// the name of the test setup, as stored in the db
        /// </summary>
        public string TestSetupName { get; set; } = null;
        /// <summary>
        /// the description of the test setup, as stored in the db
        /// </summary>
        public string TestSetupDescription { get; set; } = null;
        /// <summary>
        /// the user provided test id that was stored in the db
        /// </summary>
        public string TestId { get; set; }
        /// <summary>
        /// whether the test was marked as destructive or not
        /// </summary>
        public bool Destructive { get; set; }
        /// <summary>
        /// the time the unit was armed (or autoarmed)
        /// </summary>
        public DateTime ArmTime { get; set; }
        /// <summary>
        /// gzip'd bytes representing the test setup xml
        /// </summary>
        public byte[] TestSetup { get; set; }
        /// <summary>
        /// the primary key/id of the record in the sensor history table
        /// </summary>
        public long SensorTestHistoryId { get; set; }

        /// <summary>
        /// the id of the sensor in the sensors table
        /// </summary>
        public int SensorId { get; set; } = -1;
        /// <summary>
        /// the serial number of the sensor
        /// </summary>
        public string SerialNumber { get; set; }
        /// <summary>
        /// the capacity of the sensor when the test was armed
        /// </summary>
        public double Capacity { get; set; }
        /// <summary>
        /// the range the sensor was armed with
        /// </summary>
        public double Range { get; set; }
        /// <summary>
        /// the Date of the Calibration of the unit
        /// </summary>
        public DateTime CalibrationDate { get; set; } = DateTime.MinValue;
        /// <summary>
        /// the hardware channel the sensor was on
        /// </summary>
        public string HardwareChannelName { get; set; }
        /// <summary>
        /// the iso channel name
        /// </summary>
        public string ISOChannelName { get; set; } = null;
        /// <summary>
        /// the iso code of the sensor
        /// </summary>
        public string ISOCode { get; set; } = null;
        /// <summary>
        /// the user channel name the sensor was on
        /// </summary>
        public string UserChannelName { get; set; } = null;
        /// <summary>
        /// the user code of the channel the sensor was on
        /// </summary>
        public string UserCode { get; set; } = null;
        /// <summary>
        /// the sensitivity of the channel (taken directly as a string, like in the dts file)
        /// </summary>
        public string Sensitivity { get; set; } = null;
        /// <summary>
        /// the filter class of the channel (taken as a string, like in the dts file)
        /// </summary>
        public string FilterClass { get; set; } = null;
        /// <summary>
        /// whether the sensor was marked as proportional or not
        /// </summary>
        public bool IsProportional { get; set; }
        /// <summary>
        /// any linearization formula stored with the sensor
        /// </summary>
        public string LinearizationFormula { get; set; } = null;
        /// <summary>
        /// EID on the sensor during the event
        /// </summary>
        public string EID { get; set; } = null;
        /// <summary>
        /// measured excitation
        /// </summary>
        public double MeasuredExcitation { get; set; } = double.NaN;
        /// <summary>
        /// measurement unit on the channel
        /// </summary>
        public string MeasurementUnit { get; set; }
        /// <summary>
        /// samples per second for the channel the sensor was on during the event
        /// </summary>
        public int SamplesPerSecond { get; set; }
        /// <summary>
        /// the Anti-alias filter for the channel the sensor was on during the event
        /// </summary>
        public int AAF { get; set; }

        public SensorTestHistory(IDataReader reader)
        {
            TestHistoryId = GetLong(reader, "TestHistoryId");
            TestSetupId = GetInt(reader, "TestSetupId");
            TestSetupName = GetString(reader, "TestSetupName");
            TestSetupDescription = GetString(reader, "TestSetupDescription");
            TestId = GetString(reader, "TestId");
            Destructive = GetBool(reader, "Destructive");
            ArmTime = GetDateTime(reader, "ArmTime");
            TestSetup = GetBytes(reader, "TestSetup");
            SensorTestHistoryId = GetLong(reader, "SensorTestHistoryId");
            SensorId = GetInt(reader, "SensorId");
            SerialNumber = GetString(reader, "SerialNumber");
            Capacity = GetDouble(reader, "Capacity");
            Range = GetDouble(reader, "Range");
            CalibrationDate = GetDateTime(reader, "CalibrationDate");
            HardwareChannelName = GetString(reader, "HardwareChannelName");
            ISOChannelName = GetString(reader, "ISOChannelName");
            ISOCode = GetString(reader, "ISOCode");
            UserChannelName = GetString(reader, "UserChannelName");
            UserCode = GetString(reader, "UserCode");
            Sensitivity = GetString(reader, "Sensitivity");
            FilterClass = GetString(reader, "FilterClass");
            IsProportional = GetBool(reader, "IsProportional");
            LinearizationFormula = GetString(reader, "LinearizationFormula");
            EID = GetString(reader, "EID");
            MeasuredExcitation = GetDouble(reader, "MeasuredExcitation");
            MeasurementUnit = GetString(reader, "MeasurementUnit");
            SamplesPerSecond = GetInt(reader, "SamplesPerSecond");
            AAF = GetInt(reader, "AAF");
        }

        public SensorTestHistory()
        {
        }
        /// <summary>
        /// helper function, returns a datetime if db value is valid,
        /// DateTime.MinValue otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        private DateTime GetDateTime(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return DateTime.MinValue; }

            return Convert.ToDateTime(o);
        }
        /// <summary>
        /// helper function, returns a bool if db value is valid,
        /// false otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        private bool GetBool(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return false; }

            return Convert.ToBoolean(o);
        }
        /// <summary>
        /// helper function, returns a long if db value is valid
        /// long.MinValue otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        private long GetLong(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return long.MinValue; }
            else
            {
                return Convert.ToInt64(o);
            }
        }
        /// <summary>
        /// helper function, returns int if db value is valid,
        /// int.MinValue otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        public int GetInt(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return int.MinValue; }
            return Convert.ToInt32(o);
        }
        /// <summary>
        /// returns a double if db value is valid,
        /// double.NaN otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        public double GetDouble(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return double.NaN; }
            return Convert.ToDouble(o);
        }
        /// <summary>
        /// returns a string if db value is valid,
        /// string.Empty otherwise
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        public string GetString(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o)) { return string.Empty; }

            return Convert.ToString(o);
        }
        /// <summary>
        /// returns byte [] if db value is valid, otherwise
        /// byte[0]
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="field"></param>
        /// <returns></returns>
        public byte[] GetBytes(IDataReader reader, string field)
        {
            var o = reader[field];
            if (DBNull.Value.Equals(o))
            {
                return new byte[0];
            }
            return (byte[])o;
        }
        /// <summary>
        /// returns all records matching sensor serial number
        /// </summary>
        /// <param name="sensorSerial"></param>
        /// <returns></returns>
        public static SensorTestHistory[] GetSensorTestHistory(string sensorSerial)
        {
            var list = new List<SensorTestHistory>();
            using (var cmd = DbOperations.GetSQLCommand(true))
            {
                try
                {
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.CommandText = "sp_SensorTestHistoryGet";
                    cmd.Parameters.Add(new SqlParameter("@SerialNumber", SqlDbType.NVarChar)
                    { Value = sensorSerial });
                    var reader = cmd.ExecuteReader();

                    while (reader.Read())
                    {
                        var history = new SensorTestHistory(reader);
                        list.Add(history);
                    }
                }
                finally
                {
                    cmd.Connection.Dispose();
                }
            }

            return list.ToArray();
        }
        /// <summary>
        /// returns an xml document in string for representing all given histories
        /// </summary>
        /// <param name="histories"></param>
        /// <returns></returns>
        public static string SerializeToString(SensorTestHistory[] histories)
        {
            var serializer = new XmlSerializer(typeof(SensorTestHistoryCollection));
            using (var stream = new MemoryStream())
            {
                serializer.Serialize(stream, new SensorTestHistoryCollection(histories));
                return Encoding.UTF8.GetString(stream.ToArray());
            }
        }
        /// <summary>
        /// this is just a helper class for xml serialization
        /// </summary>
        [Serializable]
        public class SensorTestHistoryCollection
        {
            public SensorTestHistory[] SensorHistory { get; set; }

            public SensorTestHistoryCollection(SensorTestHistory[] history)
            {
                SensorHistory = history;
            }

            public SensorTestHistoryCollection()
            {
            }
        }
    }
}