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.TestSetups
{
    /// <summary>
    /// this is a class representing test history
    /// 3003 Attach Test History to Sensors
    /// </summary>
    [Serializable]
    public class TestHistory
    {
        /// <summary>
        /// the primary key/id for the record in the test history table
        /// </summary>
        public long TestHistoryId { get; set; }
        /// <summary>
        /// the id for the test setup in the db
        /// </summary>
        public int TestSetupId { get; set; }
        /// <summary>
        /// the name of the test setup
        /// </summary>
        public string TestSetupName { get; set; }
        /// <summary>
        /// the description for the test setup
        /// </summary>
        public string TestSetupDescription { get; set; }
        /// <summary>
        /// the user provided test id for the test run
        /// </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 auto-armed
        /// </summary>
        public DateTime ArmTime { get; set; }
        /// <summary>
        /// bytes array representing the test setup xml in gzip'd compressed form
        /// </summary>
        public byte[] TestSetup { get; set; }

        public TestHistory()
        {
        }

        public TestHistory(IDataReader reader)
        {
            var o = reader["TestHistoryId"];
            if (!DBNull.Value.Equals(o))
            {
                TestHistoryId = Convert.ToInt64(o);
            }

            o = reader["TestSetupId"];
            if (!DBNull.Value.Equals(o))
            {
                TestSetupId = Convert.ToInt32(o);
            }

            o = reader["TestSetupName"];
            if (!DBNull.Value.Equals(o))
            {
                TestSetupName = Convert.ToString(o);
            }

            o = reader["TestSetupDescription"];
            if (!DBNull.Value.Equals(o))
            {
                TestSetupDescription = Convert.ToString(o);
            }

            o = reader["TestId"];
            if (!DBNull.Value.Equals(o))
            {
                TestId = Convert.ToString(o);
            }

            o = reader["Destructive"];
            if (!DBNull.Value.Equals(o))
            {
                Destructive = Convert.ToBoolean(o);
            }

            o = reader["ArmTime"];
            if (!DBNull.Value.Equals(o))
            {
                ArmTime = Convert.ToDateTime(o);
            }

            o = reader["TestSetup"];
            if (!DBNull.Value.Equals(o))
            {
                TestSetup = (byte[])o;
            }
        }
        /// <summary>
        /// retrieves all test histories matching the test name
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public static TestHistory[] GetTestHistory(string name)
        {
            var list = new List<TestHistory>();
            using (var cmd = DbOperations.GetSQLCommand(true))
            {
                try
                {
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.CommandText = "sp_TestHistoryGet";
                    cmd.Parameters.Add(new SqlParameter("@TestSetupName", SqlDbType.NVarChar)
                    { Value = name });

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

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

            public TestHistoryCollection(TestHistory[] histories)
            {
                Histories = histories;
            }
            public TestHistoryCollection() { }
        }
    }
}